From: John Hernlund Subject: Re: [Fwd: [Fwd: Pymatuning, Ohio, Earthquake]] Date: Wed, 30 Sep 1998 14:28:29 -0700 (MST) Edward or Anyone Else, I take it there must not have been enough good data for a moment tensor solution? I have not seen one available, and I think it would be extremely interesting... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "It is easier to excuse an ignorant person who claims that theory is unnecessary and dispensable in his supposed practice, than to excuse a Sophist who concedes its value to the schools (as, perhaps, only a mental exercise) but who at the same time maintains that matters are quite different in practice- that as one leaves school to enter the world, one will realize one has been pursuing empty ideals and philosophical dreams- and, in a word, that what sounds good in theory is of no practical use." -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No Practical Use ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: [Fwd: [Fwd: Pymatuning, Ohio, Earthquake]] Date: Wed, 30 Sep 1998 16:30:47 -0600 John- I've been so up to my ass in digital and bureaucratic alligators with our own aftershock program, I haven't had a chance to check. Let me know what you find. -Edward John Hernlund wrote: > Edward or Anyone Else, > I take it there must not have been enough good data for a moment tensor > solution? I have not seen one available, and I think it would be extremely > interesting... > > ****************************************************************************** > > John Hernlund > E-mail: hernlund@....... > WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ > http://www.public.asu.edu/~hernlund/ > > "It is easier to excuse an ignorant person who claims that theory is > unnecessary and dispensable in his supposed practice, than to excuse a > Sophist who concedes its value to the schools (as, perhaps, only a mental > exercise) but who at the same time maintains that matters are quite > different in practice- that as one leaves school to enter the world, one > will realize one has been pursuing empty ideals and philosophical dreams- > and, in a word, that what sounds good in theory is of no practical > use." > -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No > Practical Use > > ****************************************************************************** > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick US Geological Survey Golden, CO 80401 USA TEL: 303-273-8609 FAX: 303-273-8600 -------------------------------------------------------------- Pymatuning Earthquake Field Headquarters (1998 Sep 27 ... ) Cianci's Motel, 395 Mercer Rd (HWY#58), Greenville, PA 16125 TEL: 724-588-8550 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: Those Pesky Little Geophones Date: Wed, 30 Sep 1998 19:49:22 +0000 Hello All, (they're back!) Could someone recommend book or paper which describe the geophone sensor? Thank you. Walt Williams, 98.09.30 dfheli@.............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: PSN-L: MagneTar Date: Wed, 30 Sep 1998 21:05:49 +0000 From: setv-l@........ To: seti-l@......... "'CS'" , "'FPS'" fpspace@.................>, "'ST'" Copies to: "'Don2'" , '''SK'" , "'ScottC'" Date sent: Wed, 30 Sep 1998 01:19:18 +0000 Subject: SETV-L:Tremendous GAMMA-Ray Flare Blasts Earth Send Copies to: Walt Williams Priority: normal Subject: SETI FW: TREMENDOUS GAMMA-RAY FLARE BLASTS EARTH Date sent: Tue, 29 Sep 1998 14:22:15 -0400 ---------- From: NASANews@........... Sent: Tuesday, September 29, 1998 2:10 PM To: undisclosed-recipients:; Subject: TREMENDOUS GAMMA-RAY FLARE BLASTS EARTH Donald Savage Headquarters, Washington, DC Sept. 29, 1998 (Phone: 202/358-1547) Tim Tyson Marshall Space Flight Center, Huntsville, AL (Phone: 256/544-0994) RELEASE: 98-172 TREMENDOUS GAMMA-RAY FLARE BLASTS EARTH An intense wave of gamma rays, emanating from a catastrophic magnetic flare on a mysterious star 20,000 light years away, struck the Earth's atmosphere on August 27, 1998, providing important clues about some of the most unusual stars in the Universe. Scientists said the gamma radiation posed no health risk to humans. The wave hit the night side of the Earth and ionized (or knocked electrons out of) the atoms in the upper atmosphere to a level usually seen only during daytime. This astonishing blast of ionization was detected by Prof. Umran Inan of Stanford University. "It is extremely rare for an event occurring outside the solar system to have any measurable effect on the Earth," Inan said. It was so powerful that it blasted sensitive detectors to maximum or off-scale on at least seven scientific spacecraft in Earth orbit and around the solar system. The wave of radiation emanated from a newly discovered type of star called a magnetar. Magnetars are dense balls of super- heavy matter, no larger than a city but weighing more than the Sun. They have the greatest magnetic field known in the Universe, so intense that it powers a steady glow of X-rays from the star's surface, often punctuated by brief, intense gamma-ray flashes, and occasionally by cataclysmic flares like the one observed on August 27. Astronomers think that all these effects are caused by an out-of-control magnetic field -- a field capable of heating, mixing, and sometimes cracking the star's rigid surface to bits. In June a team of scientists led by Dr. Chryssa Kouveliotou of NASA's Marshall Space Flight Center in Huntsville, AL, used NASA's Compton Gamma Ray Observatory to detect a series of about 50 flashes from the star, a type called a Soft Gamma Repeater (SGR), known as "SGR1900+14" in the constellation Aquila. During the flashing episode, Kouveliotou's team, in collaboration with Dr. Tod Strohmayer and his colleagues at NASA's Goddard Space Flight Center, Greenbelt, MD, pointed sensitive X-ray detectors aboard NASA's Rossi X-ray Timing Explorer satellite toward the star. They found faint X-rays coming from the star, which pulsed regularly in intensity every 5.16 seconds. These 5.16-second pulses already had been detected in April, when Dr. Kevin Hurley, University of California, Berkeley, aimed the Japanese/NASA Advanced Satellite for Cosmology and Astrophysics (ASCA) at the star. Comparisons of the ASCA and RXTE data showed that the X-ray pulses were gradually slowing down. The finding implies that the Soft Gamma Repeater has a magnetic field about 800 trillion times stronger than Earth's magnetic field, and about 100 times stronger than any found anywhere in the Universe. Kouveliotou and her team had earlier found that another SGR was also a magnetar. This was exactly what Dr. Robert Duncan, University of Texas, Austin, and Dr. Christopher Thompson, University of North Carolina, Chapel Hill, predicted in 1992 when they originated the "magnetar" theory. Before the NASA team could announce these conclusions, SGR1900+14 emitted the tremendous flare of August 27, which was observed by almost every spacecraft with a high-energy radiation detector in space. "Magnetars seem to answer several mysteries about the structure and evolution of stars," said Kouveliotou. "We think magnetars spend their first 10,000 years as Soft Gamma Repeaters. As they weaken with age and slow their rotation, they become Anomalous X-ray Pulsars -- stars that do not have enough 'juice' to flash anymore, but which emit a steady flow of X-rays for perhaps another 30,000 years. After that, they fade to black and drift for eternity through the heavens. The absence of observable pulsars in some supernova remnants just means that the pulsar's lights have gone out sooner than we expected." A magnetar forms from the explosion, or supernova, of a very large, ordinary star. The star's heavy center collapses under its own gravity into a dense ball of super-compressed matter 12 miles across. This "neutron star" consists mostly of neutrons in a dense fluid, but the outer layers solidify into a rigid crust of atoms about 1 mile deep, with a surface of iron. Even with this solid crust, a magnetar is incredibly unstable. Almost unimaginable magnetic fields, about 800 trillion times that of Earth's, cause the crust to crack and ripple in powerful starquakes. The energy released in these explosive starquakes streams out into space as intense flashes of gamma- rays. In the August 27 flare, pure magnetic energy was also released, as the star's entire crust was broken to bits. "A magnet this strong could erase the magnetic strip on the credit cards in your wallet or pull the keys out of your pocket from a distance halfway to the Moon," said Duncan. - end - EDITOR'S NOTE: Additional information on magnetars or the Aug. 27 event is available on the internet at: http://www1.msfc.nasa.gov/NEWSROOM/ and http://www.magnetars.com/ * * * NASA press releases and other information are available automatically by sending an Internet electronic mail message to domo@............ In the body of the message (not the subject line) users should type the words "subscribe press-release" (no quotes). The system will reply with a confirmation via E-mail of each subscription. A second automatic message will include additional information on the service. NASA releases also are available via CompuServe using the command GO NASA. To unsubscribe from this mailing list, address an E-mail message to domo@............ leave the subject blank, and type only "unsubscribe press-release" (no quotes) in the body of the message. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Those Pesky Little Geophones Date: Wed, 30 Sep 1998 22:03:33 -0700 Walt Williams wrote: > Could someone recommend book or paper which describe the > geophone sensor? I still have my sorry little FAQ up at: http://www.treefort.org/~ghost/geo.html You probably wanted something a bit more detailed... let me know what it is when you find it. ;) ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: Those Pesky Little Geophones Date: Thu, 1 Oct 1998 11:29:29 EDT Hello, Try "ENCYCLOPEDIC DICTIONARY OF EXPLORATION GEIOPHYSICS" by R. E. Sheriff published by the Society of Exploration Geophysics, Tulsa OK, U. S. A. In a message dated 98-09-30 22:54:30 EDT, dfheli@.............. writes: << Could someone recommend book or paper which describe the geophone sensor? >> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lahr@.................. Subject: Mechanism of the Pymatuning, Ohio, Earthquake Date: Thu, 1 Oct 1998 09:30:46 -0600 (MDT) The Harvard mechanism indicates predominantly thrust due to northeast-southwest compression. JCLahr > From sipkin@gldage Thu Oct 1 09:25 MDT 1998 > Date: Thu, 1 Oct 1998 09:25:25 -0600 > From: sipkin@gldage (Stuart Sipkin) > To: lahr@.................. > Subject: Re: Ohio/Penn. EQ > > John, > > The following is from Harvard. > > Stuart > > ------------------------------------------------------------------------------- > > Here is a preliminary CMT solution for the recent OHIO earthquake. The solution > is calculated from intermediate period surface waves recorded on the USGS > National Seismic Network. > > September 25, OHIO, Mw=4.5 > > Goran Ekstrom > > CENTROID, MOMENT TENSOR SOLUTION > HARVARD EVENT-FILE NAME B092598X > DATA USED: NSN > L.P. BODY WAVES: 17S, 25C, T= 32 > CENTROID LOCATION: > ORIGIN TIME 19:52:55.3 0.2 > LAT 41.43N 0.04;LON 80.41W 0.03 > DEP 12.0 FIX;HALF-DURATION 1.0 > MOMENT TENSOR; SCALE 10**22 D-CM > MRR= 4.83 0.67; MTT= 0.95 0.71 > MFF=-5.77 0.31; MRT=-0.20 0.99 > MRF=-0.39 0.92; MTF= 5.92 0.38 > PRINCIPAL AXES: > 1.(T) VAL= 5.04;PLG=60;AZM=148 > 2.(N) 4.18; 30; 330 > 3.(P) -9.23; 1; 240 > BEST DOUBLE COUPLE:M0=7.1*10**22 > NP1:STRIKE=303;DIP=51;SLIP= 51 > NP2: 176; 53; 128 > > ###-------- > ######------------- > #######---------------- > ###-----#------------------ > --------########------------- > ---------###########----------- > --------##############--------- > ---------################-------- > ---------##################------ > ---------###################----- > ---------######### ########---- > ---------######## T #########-- > ------######## #########-- > P -------###################- > --------################## > --------############### > -------############ > -----###### > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Mechanism of the Pymatuning, Ohio, Earthquake Date: Thu, 01 Oct 1998 12:17:57 -0600 John- I heard from someone that there was a large non-double-couple component to the mechanism (which could be the apparent result caused by near-surface, high-frequency wave-propagation complexities) which suggested that the event may have been caused by a collapse rather than by slip on a fault plane, and, hence, aftershocks are not to be expected. However, I believe that large collapses are dangerous and also need to be investigated. -Edward lahr@.................. wrote: > The Harvard mechanism indicates predominantly thrust due > to northeast-southwest compression. > > JCLahr > > > From sipkin@gldage Thu Oct 1 09:25 MDT 1998 > > Date: Thu, 1 Oct 1998 09:25:25 -0600 > > From: sipkin@gldage (Stuart Sipkin) > > To: lahr@.................. > > Subject: Re: Ohio/Penn. EQ > > > > John, > > > > The following is from Harvard. > > > > Stuart > > > > ------------------------------------------------------------------------------- > > > > Here is a preliminary CMT solution for the recent OHIO earthquake. The solution > > is calculated from intermediate period surface waves recorded on the USGS > > National Seismic Network. > > > > September 25, OHIO, Mw=4.5 > > > > Goran Ekstrom > > > > CENTROID, MOMENT TENSOR SOLUTION > > HARVARD EVENT-FILE NAME B092598X > > DATA USED: NSN > > L.P. BODY WAVES: 17S, 25C, T= 32 > > CENTROID LOCATION: > > ORIGIN TIME 19:52:55.3 0.2 > > LAT 41.43N 0.04;LON 80.41W 0.03 > > DEP 12.0 FIX;HALF-DURATION 1.0 > > MOMENT TENSOR; SCALE 10**22 D-CM > > MRR= 4.83 0.67; MTT= 0.95 0.71 > > MFF=-5.77 0.31; MRT=-0.20 0.99 > > MRF=-0.39 0.92; MTF= 5.92 0.38 > > PRINCIPAL AXES: > > 1.(T) VAL= 5.04;PLG=60;AZM=148 > > 2.(N) 4.18; 30; 330 > > 3.(P) -9.23; 1; 240 > > BEST DOUBLE COUPLE:M0=7.1*10**22 > > NP1:STRIKE=303;DIP=51;SLIP= 51 > > NP2: 176; 53; 128 > > > > ###-------- > > ######------------- > > #######---------------- > > ###-----#------------------ > > --------########------------- > > ---------###########----------- > > --------##############--------- > > ---------################-------- > > ---------##################------ > > ---------###################----- > > ---------######### ########---- > > ---------######## T #########-- > > ------######## #########-- > > P -------###################- > > --------################## > > --------############### > > -------############ > > -----###### > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick US Geological Survey Golden, CO 80401 USA TEL: 303-273-8609 FAX: 303-273-8600 -------------------------------------------------------------- Pymatuning Earthquake Field Headquarters (1998 Sep 27 ... ) Cianci's Motel, 395 Mercer Rd (HWY#58), Greenville, PA 16125 TEL: 724-588-8550 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Mechanism of the Pymatuning, Ohio, Earthquake Date: Thu, 01 Oct 1998 11:57:46 -0700 (MST) On Thu, 1 Oct 1998, Edward Cranswick wrote: > I heard from someone that there was a large non-double-couple component > to the mechanism (which could be the apparent result caused by near-surface, > high-frequency wave-propagation complexities) which suggested that the event > may have been caused by a collapse rather than by slip on a fault plane, > and, hence, aftershocks are not to be expected. However, I believe that > large collapses are dangerous and also need to be investigated. > -Edward That is very interesting indeed. The depth is given as 12.0 below, which would have to mean something collapse-able survived to that depth, provided that the depth is accurate. Are there any inferences from cross-sections, etc. that might guess what kind of structure is down there? I would guess mostly metamorphics, possibly metasedimentary rocks? I wonder how many old faults from the Appalachian episode might exist on the West side of the mountains... > > The Harvard mechanism indicates predominantly thrust due > > to northeast-southwest compression. > > > DEP 12.0 FIX;HALF-DURATION 1.0 > > > MOMENT TENSOR; SCALE 10**22 D-CM > > > BEST DOUBLE COUPLE:M0=7.1*10**22 > > > NP1:STRIKE=303;DIP=51;SLIP= 51 > > > NP2: 176; 53; 128 > > > ###-------- > > > ######------------- > > > #######---------------- > > > ###-----#------------------ > > > --------########------------- > > > ---------###########----------- > > > --------##############--------- > > > ---------################-------- > > > ---------##################------ > > > ---------###################----- > > > ---------######### ########---- > > > ---------######## T #########-- > > > ------######## #########-- > > > P -------###################- > > > --------################## > > > --------############### > > > -------############ > > > -----###### ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "It is easier to excuse an ignorant person who claims that theory is unnecessary and dispensable in his supposed practice, than to excuse a Sophist who concedes its value to the schools (as, perhaps, only a mental exercise) but who at the same time maintains that matters are quite different in practice- that as one leaves school to enter the world, one will realize one has been pursuing empty ideals and philosophical dreams- and, in a word, that what sounds good in theory is of no practical use." -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No Practical Use ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: BZIMMERMAN@............ Subject: Re: Mechanism of the Pymatuning, Ohio, Earthquake Date: Thu, 01 Oct 1998 15:10:29 -0500 (EST) If you move closer to the surface the Salina Group salt beds come into play. Depth 3,000-5,000 feet here in Erie County and geetting deeper as you go south. How precise is the depth determination ? Brian Zimmerman _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Mechanism of the Pymatuning, Ohio, Earthquake Date: Thu, 01 Oct 1998 12:41:02 -0700 (MST) On Thu, 1 Oct 1998 BZIMMERMAN@............ wrote: > If you move closer to the surface the Salina Group salt beds come into > play. Depth 3,000-5,000 feet here in Erie County and geetting deeper as > you go south. > How precise is the depth determination ? Since local coverage is very poor, and the body waves complicated further as mentioned before I am sure it probably isn't very good. I like the idea of salt beds though... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "It is easier to excuse an ignorant person who claims that theory is unnecessary and dispensable in his supposed practice, than to excuse a Sophist who concedes its value to the schools (as, perhaps, only a mental exercise) but who at the same time maintains that matters are quite different in practice- that as one leaves school to enter the world, one will realize one has been pursuing empty ideals and philosophical dreams- and, in a word, that what sounds good in theory is of no practical use." -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No Practical Use ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Hall scanned circuit/s is on web site Date: Thu, 01 Oct 1998 14:07:15 -0600 Hi guys, Now have rough scanned circuits of Robert Lamb's Hall amplifier on my web site. The main amplifier needs to be redrawn, but the gist of it is there. Redrew the simplified meter circuit. Thats all the electronics involved. No power supply circuit drawn and its presumed to be other equipment. The 10K resistor coming off terminal 9 feeds directly into Larry Cochranes board & SDR program; other programs/boards may have to be adjusted however. http://www.geocities.com/ResearchTriangle/Facility/1739/index.html The web site needs a gob more detail with the circuit description and operation, parts list, etc. Eventually it will come. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: vbb zero drift Date: Thu, 1 Oct 1998 18:59:18 -0500 (CDT) Barry, Regarding your questions about the need for frequent recentering of your VBB instrument and how this is done with commercial units: The key parameter that effects the thermal stability is the operating period. A 100 second sensor will be about 10 times more of a problem than a 10 second sensor, everything else being equal. So every effort is made in the design to reduce mechanical thermal effects as much as possible. This is one of the reasons that the commercial units are so expensive. But even when the commercial units specify an operating range of +,- 10 degC without re-zeroing, it actually means that the mass or boom will move through its full range during that temperature change. For these sensors, the mass position voltage may range +- 10 volts, but the diurnal earth tides may be 1% of this, equilavent to a temperature change of only 0.1 degC, which, of course, must be much less than this if one wants to record the tides without thermal noise. This is why very careful site selection and elaborate site prepartions are necessary, and sites in deep vaults or caverns are preferable. Link from the PSN site page re. "information, equipment, and software" to the "Guidelines for Installing Broadband Seismic Stations" by the Berkeley Seismo. Lab for a detailed discussion. In general the insulation, etc, should be sufficient so that no daily thermal effects are seen, but seasonal temperature changes might require recentering. The commercial sensors have automatic re-centering features that either drive a miniature motor or apply a DC correction to the displacement detector output. They also have a relatively long time recommended for them to reach thermal stability, like several days. The commercial sensors generally are digitized with 24-bit resolution, or 1 part per 16 million, so the output is always on-scale. The DC offset caused by temperature is removed in processing. But for 16-bit digitizers, a high-pass filter is necessary to keep the data within the range of the digitizer. If the filter period is at least 10 times the longest period of the data, it will not affect the response. So for the 100-second STM-8, I use a 2000-second (2x 4000 ufarad in series, with 1 megohm, a single-pole) high pass coupling into the output amplifier. My RS multimeter digitizer is +,- 200 mv full scale, with the LSB being 0.1 millivolt; the daily temperature drift of the VBB output ranges from 0.1 to 1 volt, but the filter keeps this from the digitizer. I haven't had to re-center the sensor operating in the basement for several weeks, although its output has wandered around by several volts. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Mechanism of the Pymatuning, Ohio, Earthquake Date: Thu, 01 Oct 1998 20:11:24 -0600 Brian- Someone will quantify the depth uncertainty, I hope. Thank you for your remarks in your previous post; it was good to meet you. I think that, with your expertise in economic geology and your interest and knowledge of seismology in conjunction with your proximity, you are in a position to make a valuable contribution to the study of the Pymatuning Earthquake. -Edward BZIMMERMAN@............ wrote: > If you move closer to the surface the Salina Group salt beds come into > play. Depth 3,000-5,000 feet here in Erie County and geetting deeper as > you go south. > > How precise is the depth determination ? > > Brian Zimmerman > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick US Geological Survey Golden, CO 80401 USA TEL: 303-273-8609 FAX: 303-273-8600 -------------------------------------------------------------- Pymatuning Earthquake Field Headquarters (1998 Sep 27 ... ) Cianci's Motel, 395 Mercer Rd (HWY#58), Greenville, PA 16125 TEL: 724-588-8550 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Dataq acquisition module Date: Fri, 02 Oct 1998 04:53:20 +0000 Gregory Bajuk wrote: > Dataq Instruments has an Internet special price promotion on a serial port > data acquisition module DI-150. Features 2 channels, +/- 10 volt input, The internet special is for the DI-150-SP. They also sell the DI-150-RS. The SP model is not stable in the +-100mv range. Luckily I got a sales guy that knew what was going on. Hopefully nobody bought something that they didn't want. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Steve Carniglia" Subject: Re: Dataq acquisition module Date: Fri, 2 Oct 1998 08:14:10 -0700 I sent the board to Ted Blank.....he tried to make his software work = with the DI190...He felt that the problem was in the video graphics area = so his software would not work. Other than that, Ted was able to see = the board. I do not know about the other software out there...please = let me know if you know of software that is compatible.... Thanks Steve =20 -----Original Message----- From: Francesco To: PSN-L Mailing List Date: Wednesday, September 30, 1998 11:22 AM Subject: R: Dataq acquisition module =20 =20 Which problem have the board using our software (Sdr or Emon or Wq?) = ? =20 Regards Francesco Nucera
I sent the board to Ted Blank.....he = tried to=20 make his software work with the DI190...He felt that the problem was in = the=20 video graphics area so his software would not work.  Other than = that, Ted=20 was able to see the board.  I do not know about the other software = out=20 there...please let me know if you know of software that is=20 compatible....
 
Thanks
Steve
 
-----Original = Message-----
From:=20 Francesco <franuc@......>
To: = PSN-L=20 Mailing List <psn-l@.............>
Dat= e:=20 Wednesday, September 30, 1998 11:22 AM
Subject: R: = Dataq=20 acquisition module

Which problem have the board = using our=20 software (Sdr or Emon or Wq?) ?
 
Regards
Francesco=20 Nucera
From: GeE777@....... Subject: Re: Those Pesky Little Geophones Date: Fri, 2 Oct 1998 12:24:26 EDT Hi, This is taken grom "Seismic Exploration Fundamentals" by J. A. Coffeen p66,67 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Geophone A geophone is a device for detecting sounds from the earth--geo, earth; phone, sound. The type of geophone generally used in seismic exploration on land consists of a strong permanent magnet and a coil of wire, around the magnet, all in a rugged case. The magnet is attached rigidly to the case, which can also retain the magnetic field. The coil, made of fine copper wire wound many times around, is connected to the case by a spring. The geophone is placed in firm contact with the ground. Then any shaking of the ground will shake the case and magnet. The coil, suspended on its spring, will not move as quickly. So the magnet moves up and down past the coil. Relative movement between magnet and coil generates electric current, on this small scale, just as it does in the dynamoes that power cities. The ends of the coil are connected to a "pigtail", a pair of wires extending from the case. to be connected, through the cable, to the recording equipment. The bits of current generated by the movements of the magnet make up the signal from the geophone. They are in proportion to the speed the magnet moves past the coil, so this type of detector is called a velocity geophone. Geophones are set out by recording helpers, "jug hustlers". The "string" of geophones for a group is put on the ground at a set distance from each other. Good contact with the ground is assured. Geophones often have spikes on the bottom, so they can be stabbed into the ground. For frozen ground, they may be flat-bottomed, and need to be pressed into place, or grass scraped aside. Assuring the good contact is "planting" the geophones. A good plant is one in which the contact will allow vibration to be transmitted well from the earth to the geophone. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I am retired from a major oil company research department. I have 8 patents concerning geophones. My expermints indicate that if a geophone can easilly be buried 10 to 20 cm below the surface, there is a much better coupling than on the surface. It is best to remove the "spike" before burying the geophone. This gives the geophone a better impedance match with the earth. You must remember, that most of the time we in the exploration industry are looking for higher frequencies than in the natural seismic studies. George Erich _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: new, revised schematics for VRDT Date: Fri, 2 Oct 1998 20:36:57 -0500 (CDT) Re: VBB schematics: I have just scanned some new and revised schematic drawings regarding the VRDT displacement detector for the VBB seismometer. The drawings are found on the "figures, schematics, drawings ..." page at: http://www.eas.slu.edu/People/STMorrissey/index.html Fig 5 is a hopefully final update of the precision sine wave oscillator that is used (at 5 khz output) with the VRDT. Fig 6 is a NEW drawing showing the connections of the VRDT in the bridge circuit between the oscillator and the amplifier/demodulator. Fig 7 is a final update of the bridge amplifier/demodulator/ DC amplifier, with specific attention to use with a VRDT. Fig 13 shows the results of a sine wave calibration of the 90-second VBB sensor compared with the response indicated by the transfer function. Fig 14 is a plot of the digital data for the sine calibration. A "constant velocity" method was used, which is explained. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: VBB Schematics Date: Sat, 03 Oct 1998 11:47:06 -0400 Thanks a lot for the updated schematics, this really pulls the VBB electronics together! I would also like your opinion on breadboarding techniques. I have been using vector board (perf board with holes on .01" centers), IC sockets, and vector clips (small clips that are pushed into .01" holes of perf board & components are soldered on one side, wiring on other). I have been looking into a new system that works with surface-mount components, but it is rather expensive. Everything is soldered on small boards that are then attached to a large board that acts as a ground plane I realize that the above technique has to be done with some thought for high frequency applications; such as, 'large' power feeds (star connections) and try to avoid 'long' parallel runs. What about low noise techniques? I realize that an etched pc board is the best, but for one-shot applications it isn't economically feasible. Rex Klopfenstein, Jr Bowling Green, OH _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: vbb zero drift Date: Sat, 03 Oct 1998 10:21:26 -0700 Sean Thomas Thanks for the info on the commercial units. It would be nice to be able to set a unit down in the field in a reasonably level site and walk away. I am still hopefull. Regards Barry PS I picked up a small FB accelerometer from a gentleman with a company called CFX out of Pennsylvania. I have it hooked up adjacent to my VBB and Lehman. The output calibration shows a flat output from DC to 25 hz. It didn't pick up a 4.7 event in S. Cal @ 677k (did with Lehman) but I am hopeful on a teleseismic event. It did pick up a local Redding 3.1 event. It's about 1" in diameter and about 1.5" tall. It wasn't cheap ($170). It requires 6-12 vts @ about 8 ma. Regards Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: prototype PC boards Date: Sat, 3 Oct 1998 13:52:30 -0500 (CDT) Rex, RE. prototyping circuit boards, aka one-of-a-kind specials: For quick evaluation of circuits I have been using the solderless breadboards (the square white push-in boards, as in Newark pg 1579, similarly available at Radio Shack) for many years. They can have flaky connections, especially if oversize wires/leads are forced into the holes, or if they have been exposed to dampness. THey can handle a few to a dozen ICs. But for a permanent prototype, or a few special circuits with ICs, I use the Vector boards that have some pre-printed foil patterns on one side, such as their 3677-6 (Newark pg 547, $21 for a 4.5 x 8" board). I cut them to size with an office paper cutter. There are many patterns available, but this seems to be the most generic, and the continuous busses can be used for DC supplies or ground. I have tried their spring-clip mounting, but they are unreliable the long run. I prefer to have things soldered in, and to use good quality IC sockets. I use "solder wick" to remove or change components, or a header in an IC socket for an experimental set of Rs and Cs for such things as a filter. For some digital interfaces, I have used the same boards with IC sockets with wire-wrap pins, and headers for components, and they have worked for years. But I think that a fully soldered epoxy-base board with quality IC sockets is just as good as an etched PC board wrt noise, etc., and we certainly are not pushing any high frequency considerations. I have little experience with the surface mount prototyping, since It seems to lock one into a rather inflexible style and component choice. My old eyes prefer more visible components anyhow. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: frankcnd@.................... (Frank Condon) Subject: Salton Sink Hot-Spot Date: Sat, 3 Oct 1998 12:12:31 -0700 (PDT) Hello: I need you all to evaluate this GOES satellite information as relayed to me through the University of Hawaii Hot-Spot Web Page. Apparently, "Bombay Beach" is showing something that indicates to them possible volcanic activity under the Salton Sea. Note: the use of the word "Anaheim." Why isn't it titled as to the proper location under the Salton Sea? http://volcano1.pgd.hawaii.edu/goes/anaheim/latest.shtml What is this all about? Frank Condon "Located in the seismic corridor somewhere between Fontana and Mammoth Lakes" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Charles R. Patton" Subject: Re: Breadboard techniques Date: Sat, 03 Oct 1998 12:40:13 -0700 Rex, you asked: =93I would also like your opinion on breadboarding techniques.=94 I would answer as follows: 1) Unless you have a space problem, I personally like the 0.1=94 hole center perf board because there are still huge quantities of parts with pinouts that fit this layout, from connectors to IC=92s. 2) When doing low frequency, perhaps 1 MHz or below, I use wire wrap, and above that frequency I start using point-to-point wire soldered on the pads. 3) And MOST IMPORTANT (and I cannot overemphasize this point) =96 Never use the plain perf board with just holes or holes with solder pads only. Get perf board with a ground plane on one side. This advice applies from DC to light! The ground plane is your best protection from all sorts of =93squirrely=94 behavior with problems ranging from hum to intermittent performance. At work I had special 9=94x9=94 breadboards la= id out and we buy them in quanity. I have only found two sources of something satisfactory in the marketplace. A few are Vector and generally are PC form factor plug-in breadboards with ground planes. These are in the $50 plus price range. The best deal I have found is from: Marlin P. Jones & Assoc. Inc. Phone: 561-848-8236 FAX: 561-844-8764 P.O.Box 12685 Lake Park, Florida 33403-0685 In their 98-4AB catalog on page 86 they have two 6.5=94 x 4.125=94 Proto cards, 0.062=94 Epoxy glass boards with ground plane one side and pads on the other side. I bought one of the 9033-PB boards and found it to be just fine. They are solder plated and routed to shape. Order no.: 9033-PB donut pads $8.95 9035-PB square pads $8.95 They have a $15.00 minimum order policy, but two of these boards will fill that. You can use most SMT parts on the 0.1=94 center pads since most IC=92s us= e 0.05=94 lead spacing. So you solder alternate leads to the adjacent pad row and the remaining leads to the next row over. I.e.: |______| -- IC U U U U -- leads O | O | O --0.1=94 center pads / / -- wire jumpers O O O --0.1=94 center pads Anyway, just a few comments on breadboarding. Hope they help. Charles R. Patton, Editor, Geo-Monitor _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Daryl P. Dacko" Subject: Re: Breadboard techniques Date: Sun, 04 Oct 1998 09:06:16 -0400 At 12:40 PM 10/3/98 -0700, you wrote: >3) And MOST IMPORTANT (and I cannot overemphasize this point) =96 Never >use the plain perf board with just holes or holes with solder pads >only. Get perf board with a ground plane on one side. This advice >applies from DC to light! The ground plane is your best protection from >all sorts of =93squirrely=94 behavior with problems ranging from hum to >intermittent performance.=20 I can get away without a ground plane, but I'm fairly good at laying out and adding enough bypass caps to stop such behavior... A very cheap, very good, but very ugly method of breadboarding is 'dead bug' style: Use unetched pc board with continious copper plateing and lay the IC's=20 on their back with the pin's (legs) straight up in the air. Use a=20 drop of instant glue to hold them in place. Solder componests directly to the pc board when you need a ground, and support the supply rails and long signal runs on bypass caps or high=20 ohmage resistors. Interconenct the components with their own leads or waste pieces of cut off leads. Probabaly the uglyest way to breadboard ever seen, but it has better=20 high frequency performance than any breadboarding system I've ever seen. I usually use two inch square pieces of board, with only one or two IC's on each 'module' and just interconnect as needed. This lets you try a=20 new low-noise front end, for example, while leaving the rest of your=20 lashup alone... Just another opinion/option/method ;') Daryl _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ACole65464@....... Subject: Re: Breadboard techniques Date: Sun, 4 Oct 1998 11:29:13 EDT Daryl, Thanks for sharing the "dead bug" idea for breadboarding electronic circuits. It sounds simple. Ideas for circuit fabrication covers an area of design that many of us need to hear about. Allan Coleman _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: CARRJJ@....... Subject: Re: Breadboard techniques Date: Sun, 4 Oct 1998 13:09:40 EDT The problem with ground plane perf boards is component thru-lead shorts. Some catalogs where these things are sold also sell a little tool for scraping away the copper around a hole just a little bit. It helps a lot. Ditto on the comments about solving problems. Joe Carr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: circuit boards Date: Sun, 4 Oct 1998 13:45:02 -0500 (CDT) Re: perforated boards with ground planes: Quite obviously the ground plane helps the noise figure, but my experience with it tends to be more related to hidden shorts of component leads, etc.. I have not found it to be necessary for sub-audio (ie seismic) amplifiers, especially when proper power supply by-passing, etc, is used. And when a perf-board proto is turned into a printed/etched board, any double-sided layout ups the complication ante, both for printing/etching proofs of the artwork in our darkroom, or getting them printed/drilled commercially. The component side layout is simulated and tested by copying the layout in reverse through the translucent mylar sheet. Also, for noise protection, we have to assume that the circuit has some external metal shielding/enclosure, and that the noise is contained by proper filtering/bypassing of the signal/power leads at the connector. I have used a variation of the "dead bug" construction technique for lightning suppression modules. Lightning loves a circuit board, and will flash over the entire surface unless it it very clean and dry and properly coated, vaporizing the foil conductors as it goes. SO for the DC power and analogue data lightning protection modules, we use a single high-barrier terminal strip with insulated "turret" style connections, further insulated with shrink tube as they pass through the holes drilled in the box, and mount the larger components (Varistors, inductors, etc) adjacent to the strip (ie on the inside of the cover of the aluminum box) with large gobs of RTV sealant. Smaller components mount directly to the terminal strip. For the UHF/VHF antenna coupler, all the components "hang" between the UHF/N/or BNC connectors at each end. The lightning cannot "bypass" the devices by flashing over an epoxy PC board. By the way, the PC artwork of the circuits of the VRDT oscillator and demodulator are available, both as the 2x original, which I can reduce to 1x on a transparency with the copier. I also have the reversed 1x printing films that can be copied to a transparency, but the result is not dark or dense enough to print a photo-resist. There is some progress in consolidating all the VBB electronics into one or two PC cards that would be available commercially. I believe these will be done with a CAD layout. Timetable ??. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Lehmann sensor Date: Sun, 04 Oct 1998 22:01:41 -0600 You're a funny dude; hope your knees are still good. Ted Blank wrote: > Maybe the Lehman Scale could be defined in terms of how high you have to > jump in the garage to get a standard deflection on a Lehman sensor. -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Breadboard techniques Date: Tue, 06 Oct 1998 10:44:35 +1200 At 09:06 AM 10/4/98 -0400, you wrote: >At 12:40 PM 10/3/98 -0700, you wrote: >>3) And MOST IMPORTANT (and I cannot overemphasize this point) =96 Never >>use the plain perf board with just holes or holes with solder pads >>only. Get perf board with a ground plane on one side. This advice >>applies from DC to light! The ground plane is your best protection from >>all sorts of =93squirrely=94 behavior with problems ranging from hum to >>intermittent performance.=20 I use Veroboard (perf woth copper strips ) for seismic work, building up to 3 preamp channels side by side, without any difficulty at all. As Sean said at the very low freqs involved with seismic work track to track inductance/capacitance is not a problem so therefore stability has not been a prob. In hi gain audio and RF u CANNOT use "Vero" perfboard as u will very quickly get instability. Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., =20 Green Is., Dunedin, =20 South Is.. New Zealand. =20 http://psn.quake.net/dave/home.htm =20 IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: circuit boards Date: Mon, 05 Oct 1998 21:16:12 -0600 S-T Morrissey wrote: > There is some progress in consolidating all the VBB electronics into > one or two PC cards that would be available commercially. I believe > these will be done with a CAD layout. Timetable ??. > > Regards, > Sean-Thomas > Sean-Thomas, Am probably pushing it; but can you elaborate more on this? thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Maximumius Glutomious Alligator bites Date: Mon, 05 Oct 1998 21:41:36 -0600 Edward Cranswick, Uhhh.....is there any cure out there in Ohio, for your bites? The weather back here in Colorado was only in the 50's today, and perhaps upon your return, the cool, will sooth the ruffles? Ha. Don't hear anything of aftershocks. Afterbites? Ha. Presume they send you off anywhere for these mainland quakes. Any interesting or noteworthy history stories to pass on of your experiences? Imagine some of the storys maybe quite interesting. Do you take gobs of equipment? Government plane? Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Seismometer Pictures Date: Tue, 06 Oct 1998 18:46:29 -0400 I found several web sites that have pictures of seismometer installations and equipement. These addresses point to homepages. At the Karlsruhe site, follow the Black Forest Observatory links http://www-gpi.physik.uni-karlsruhe.de http://www.geophys.uni-stuttgart.de Rex Klopfenstein, Jr Bowling Green, OH _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: Seismometer Pictures Date: Tue, 06 Oct 1998 19:20:35 -0600 Rex Klopfenstein, Jr. wrote: > I found several web sites that have pictures of seismometer > installations and equipement. These addresses point to homepages. At > the Karlsruhe site, follow the Black Forest Observatory links > > http://www-gpi.physik.uni-karlsruhe.de > > http://www.geophys.uni-stuttgart.de > Rex, Went to the Stuttgart site and saw all. Nice "find" of a site with pictures. Perhaps the most "upsetting" was the pictures of the retired seismometers and equipment; including the type of Sprengnethers I use. Seems such a waste to just store them and not use them. Too add to the days mix of photos, I just got done with some web site construction of my own vault pictures. None have the covers off, but they aren't too bad I think. http://www.geocities.com/ResearchTriangle/Facility/1739/vault.html This site only has pictures and afew words; not like the Index.html, which seems to be overloaded-ha. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Easiest web site construction I've seen Date: Tue, 06 Oct 1998 20:35:19 -0600 Hi all, Been using the http://www.geocities.com free web site deal for acouple of weeks. What I have is mostly the "old" html code approach. Acouple of days ago, I tried their new "GeoBuilder" program for creating html files. With that program, you can say GOODBYE to html code typeing stuff....it is actually fun to use!! Point, click, type words...no html to enter. This is a beta program, and requires that you have a computer with at least 133mghz and 24mg of ram, and windows 95 or 98, and java capability stuff. If you're experienced with Windows 95 and file manager housekeeping stuff, this shouldn't be tough to use. Oh yes, you need Internet Explorer or Netscape versions 4.0 along with your ISP. One can make a web site using just the stuff they give you. Of course it would be enhanced with any other accessories like camera, scanner or whatnot..... The main drawback I have seen is that it seems to be toooo popular, as, their can be trouble getting through on weekdays, weekends seem to be the best time to play with the program, or perhaps late at night. The last msg mention (RE:Seismometer Pictures) of the vault.html, is a example of the GeoBuilder program. Underneath that is a huge gob of html code, that the program creates by itself. One can reduce or enlarge or move pictures without leaving the program! Soooo.....if you have the right equipment, try it out, or keep it in mind, if you're aspiring for a web site eventually. I would expect to see more programs of this nature in the near future, begin to pop up alot with other hosts. Anyway.....my seismometers are "retired".....I'am "retired"... and now, html....is "retired". How about a retread job?-ha. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Easiest web site construction I've seen Date: Tue, 06 Oct 1998 22:43:23 -0700 Hi All I was also trying to put together a web page. Has anyone got a comment/recommendation about Adobe pagemill or Claris pagemaker? I think those are the program names. I would like to avoid HTML text if possible. Thanks Barry >meredith lamb wrote: > >.... > One can make a web site using just the stuff they give you. Of > course it would be enhanced with any other accessories like > camera, scanner or whatnot..... > > The main drawback I have seen is that it seems to be toooo > popular, as, their can be trouble getting through on weekdays, > weekends seem to be the best time to play with the program, > or perhaps late at night. > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Easiest web site construction I've seen Date: Wed, 07 Oct 1998 00:37:53 -0600 PSN- We used MS FrontPage'97 to make the Pymatuning EQ website: http://groundmotion.cr.usgs.gov/pym/pym.htm -Edward barry lotz wrote: > Hi All > I was also trying to put together a web page. Has anyone got a > comment/recommendation about Adobe pagemill or Claris pagemaker? I think > those are the program names. I would like to avoid HTML text if > possible. > Thanks > Barry > >meredith lamb wrote: > > > >.... > > One can make a web site using just the stuff they give you. Of > > course it would be enhanced with any other accessories like > > camera, scanner or whatnot..... > > > > The main drawback I have seen is that it seems to be toooo > > popular, as, their can be trouble getting through on weekdays, > > weekends seem to be the best time to play with the program, > > or perhaps late at night. > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Easiest web site construction I've seen Date: Wed, 07 Oct 1998 09:29:41 -0700 (MST) I try to avoid using those fancy "WYSIWYG" web page makers, because there is more going on behind the scene than it seems. There is a html language war being waged by different groups and software developers. The war is market driven of course, as businesses push hard for more commerce-friendly software online. I have tried most of the programs out there, and what I found is that generally: - Some programs made pages that only worked well with certain browsers - The file size of pages made from these programs was >3X larger than mine - The programs stuck in tags, which I hate, and slip in their name - Their tag syntax for items like tables differ - Sometimes they re-size images for a default page format - They are often way overpriced! I guess I am a more old-fashioned web person, but I simply prefer the ability to telnet into a folder, make text changes, and leave fast. This saves me a lot of time. I can also work several times faster than web developers using programs like Pagemill. I also have a preference for future web page syntax; I would love to see it incorporate some items similar to TeX on unix... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "It is easier to excuse an ignorant person who claims that theory is unnecessary and dispensable in his supposed practice, than to excuse a Sophist who concedes its value to the schools (as, perhaps, only a mental exercise) but who at the same time maintains that matters are quite different in practice- that as one leaves school to enter the world, one will realize one has been pursuing empty ideals and philosophical dreams- and, in a word, that what sounds good in theory is of no practical use." -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No Practical Use ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Easiest web site construction I've seen Date: Wed, 07 Oct 1998 17:42:03 +0000 I agree with what John H. wrote to some extent. If I had to choose a commercial program (buy one) right now, I think I'd look into Adobe Pagemill. Otherwise download (for FREE) Netscape Communicator Standard Edition, use Composer to write the page and clean it up a little by hand. Composer makes way too many tags for simple things. For example instead of a page break
sometimes it puts in
or something similar. It only makes a couple of meta tags and they are very easy to delete. One is worth keeping. It also does stuff like instead of , but they both still work. Also Composer does tend to resize images when you save the HTML. I usually correct that by hand. If you open the image in Netscape it will show the dimensions in the title bar. _________________ More on topic. I'm within weeks of buy Larry's ADC board, but I don't know about the pre-amp. I'd love to do the following (which I realize involves very little construction) 1. Get a brand new 4.5 Hz geophone and put it in a PVC pipe outside under ground a little. I'll be digging with a pick-axe if I get that far ;) I need some old work songs. 2. Put a small pre-amp in the tube with the geophone. One like Sean-Thomas uses (long battery life) 3. Convert the geophone output to fiber optic and run the fiber to the house. I want fiber optic because of lightning and the ability to extend the distance. 4. Covert back to copper at the back of the computer. I doubt all that will happen soon though. For starters I'll be using my surplus geophone from one of those $10 kits everyone bought. Maybe someday I'll finish my metal Lehman. I don't have any place to put it right now, so it doesn't matter too much. Aside from Larry's pre-amp board for the Lehmans, is there some pre-built amp that I could use for the geophone and just run the risk of lightning with copper? I don't want to have to run power to the geophone preamp AND data to the computer. With a lot more money I could probably run it with a solar panel, but... Also I'm pretty bad with a soldering iron. From the back of the computer to where I want to burry the geophone is about 20-30 ft. I can even move the computer a little closer to the wall if it would help. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: Re: Easiest web site construction I've seen Date: Wed, 7 Oct 1998 15:16:08 +0000 Hello Meridith and John Hernlund, I agree with John in his view that hand coding is best. Over the past several years and numerous sites under my belt, I personally prefer to hand code the pages. My way is the old-fashioned, 'cut-paste-upload-test/look' method. I load WSFTP (upload software), a favorite editor, I hack for awhile, upload file to my website, and look at it with my web-browser --live. Guidelines: 1 - use 800 x 600 resolution - many monitors are running this res, 2 - use a template, and hack that up, 3 - do not use tiny text, many people wear glasses, set the res for them --everybody will benefit, 4 - do not use frames, many people hate it, (is ok for catalogs) 5 - do not use fancy colors unless you test, test, and test 6 - use a spelling checker, and click & clack all of your links 7 - if you have many pictures, put them on multiple pages or better, make small clickable 'thumb-nail's and use them to load the larger pictures, more work, but infinately better, 8 - unless absolutely lossless pictures are required such as X-Ray pictures, use jpeg type compression schemes to help reduce picture size, 9 - if you want a saavy, cool site, include a TEXT-ONLY version for those folks who are using non-graphic terminals. Miscellany: 10 - include META TITLE for book-marking, 11 - include META SEARCH KEYWORDS for search engines 12 - include last modification date and your e-mail address 13 - lastly, test, test, and test. Some programs which I find are acceptable: Inprise (Borland) "IntraBuilder", HotMetal Pro (hotdog html coders choice) HotDog -- (self explanatory) Micr$oft -- FrontPage, "HTML for Dummies" was fair book on subject with lots of templates on CD. And of course, vector to NetScape for the authoratative InterNet Engineering Task Force (IETF) compliant web code tags. ---------- Shameless braggadacio....check out website Scot Stride & I made at: http://www.jpl.nasa.gov/mpfmir/rovercom/rovcom.html or mirror at: http://mars.sgi.com/rovercom/rovcom.html Best Wishes, Walt Williams, 98.10.07 dfheli@.............. ========================================================== ------- Forwarded Message Follows ------- Date: Wed, 07 Oct 1998 09:29:41 -0700 (MST) From: John Hernlund Subject: Re: Easiest web site construction I've seen To: PSN-L Mailing List Reply-to: PSN-L Mailing List I try to avoid using those fancy "WYSIWYG" web page makers, because there is more going on behind the scene than it seems. There is a html language war being waged by different groups and software developers. The war is market driven of course, as businesses push hard for more commerce-friendly software online. I have tried most of the programs out there, and what I found is that generally: - Some programs made pages that only worked well with certain browsers - The file size of pages made from these programs was >3X larger than mine - The programs stuck in tags, which I hate, and slip in their name - Their tag syntax for items like tables differ - Sometimes they re-size images for a default page format - They are often way overpriced! I guess I am a more old-fashioned web person, but I simply prefer the ability to telnet into a folder, make text changes, and leave fast. This saves me a lot of time. I can also work several times faster than web developers using programs like Pagemill. I also have a preference for future web page syntax; I would love to see it incorporate some items similar to TeX on unix... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ --->deletia<--- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: Seismometer Pictures Date: Wed, 07 Oct 1998 19:34:14 -0400 I have a question, are you using the fiberglass 'stuff' used to make air ducts for your covers? I am thinking about using the duct board as an outside cover and fill inside with several layers of foam board. The taped joints really seal out drafts and also improve the appeareance of the units. Where is your vault located? I just cut a door in my basement wall into an old cystern for a vault. It has a separate slap from the house so it is better than nothing! Now I have to clean up and paint the walls. I am planning to build a pier similar to Sean's example. I am currently machining the parts for two SG's for the E-W and N-S axis. When I get these finished with these, I'm planning build a VBB. Just starting to collect the materials and making drawings. meredith lamb wrote: > Too add to the days mix of photos, I just got done with some web > site construction of my own vault pictures. > http://www.geocities.com/ResearchTriangle/Facility/1739/vault.html > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: Easiest web site construction I've seen Date: Wed, 07 Oct 1998 18:00:52 -0600 Barry, Edward, Walt, John and Greg, Thanks for the feedback on web page makers. Seems like the heavy concensus is leaning toward Adobe Pagemill. They do have a free trial 15 day, version of it on their web site for download. http://www.adobe.com/prodindex/pagemill/demodnld.html (choice of power Macintosh or windows, but you need to fill out a form first). I went ahead and downloaded it (~14mb) plus their "getting started" manuel (~1.5mb). Briefly ran it, and in many ways its alot like the GeoBuilder program on GeoCities; but with alot more controls and choices, and explanations. One main positive is that it can be done offline, whereas GeoBuilder has ALOT to do online, and with my ISP, 20 minutes goes whipping by.....sometimes I can resume and sometimes I have to redo, if I get switched off. Too me, Netscape Composer book seems to presume that the reader already knows everything (which I don't). No outside unacqainted pre-edition suggestions readers I think. John.....liked your very extensive site...alot of great educational material there, along with alot of scenic Arizona pictures. Walt.... Yimminy Jeepers!...All those mars rover pictures that go on and on........mars exploration fans heaven! Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ralvarez@........ (Raul Alvarez) Subject: Re: Easiest web site construction I've seen Date: Wed, 7 Oct 1998 18:20:35 -0600 (MDT) Hi Meredith, Enjoyed your web page, but those COOKIES can drive you nuts. Does the geocities site allow you to turn them off? Probably not as they collect info for themselves. Raul >Hi all, > >Been using the http://www.geocities.com free web site deal >for acouple of weeks. What I have is mostly the "old" html code >approach. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: Seismometer Pictures Date: Wed, 07 Oct 1998 19:28:13 -0600 Rex Klopfenstein, Jr. wrote: > I have a question, are you using the fiberglass 'stuff' used to make air > ducts for your covers? I am thinking about using the duct board as an > outside cover and fill inside with several layers of foam board. The taped > joints really seal out drafts and also improve the appeareance of the units. No, on the two horizontals, I used the original Sprengnethers metal frames and simply covered them with layers of commercial "ReflexTex" aluminium/plastic/airbubbles insulation. I used 3M spray glue for attachment. The lower lining is surplus rubber strips to somewhat protect the insulation. However, on the vertical cover, I had to make my own frame cover. I just used peg board, aluminium angles, metal angle brackets, spray glue, 1 layer inside (with taped joints), and 2 layers outside. I salvaged the original round metal and glass viewing porthole (zero view), and stuck that on with bolts and nuts. The side closest to the viewer is actually the access "door", using drilled and tapped screws into the aluminum and pegboard substructure. Your idea of fiberglass could well work fine; but, perhaps you would still need a metal frame to connect too. > > > Where is your vault located? I just cut a door in my basement wall into an > old cystern for a vault. It has a separate slap from the house so it is > better than nothing! Now I have to clean up and paint the walls. I am > planning to build a pier similar to Sean's example. I am currently > machining the parts for two SG's for the E-W and N-S axis. When I get these > finished with these, I'm planning build a VBB. Just starting to collect the > materials and making drawings. > My vault is in the house's crawlspace corner. That way all I had to dowas build 2 short height addtional "walls", including the entrance in one. Ended up digging down an additional 6 inches, as the piers need to be more massive, and the seismometers covers needed room to lift off for servicing on the horizontals. Hope your cistern is large enough for the pier/s you may need. If not, your basement would probably work for any possible additions. Suggest thick plastic tarp underneath the piers to keep the water from being absorbed by your pier/s, and tilting stuff results/cycles. The S-G's you're building.... are you going to use Larry's capacitive sensor circuit amplifer and general size characteristics? Personally, my giant S-G's seem to work great, and the output seems to be a very close reflection of the output of the Sprengnethers horizontals; but with few short maintenance adjustments as the piers they're on, are alot smaller than the Sprengnether piers (which I need to fix), along with the throw on single styrafoam cover-ha. Good on the STM-8 VBB plans....the vertical is very important. I use my vertical as the trigger for the lot, as it doesn't show the closeby "Lawnmower quakes"-ha. Have fun... Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: Easiest web site construction I've seen Date: Wed, 07 Oct 1998 19:50:02 -0600 Raul Alvarez wrote: > Hi Meredith, > > Enjoyed your web page, but those COOKIES can drive you nuts. > Does the geocities site allow you to turn them off? Probably not > as they collect info for themselves. > > Raul > Raul, You got me there....I don't know about shutting off the "cookies". Have had experience with them with programs, but I guess overall, they don't really present too much of a problem, but, yes sometimes, they are a real nusiance....especially if ones in a hurry. So..... hows the seismograph progress going there, with or without the giant IBM voice coil magnets? Hope it is coming along. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Easiest web site construction I've seen Date: Wed, 07 Oct 1998 20:36:12 -0700 To All Also thanks for the feedback. I think I will create a page using a composer and then hand edit it. I like that Idea. Regards Barry Greg wrote: > > I agree with what John H. wrote to some extent. If I had to choose a > commercial program (buy one) right now, I think I'd look into Adobe > Pagemill. Otherwise download (for FREE) Netscape Communicator Standard > Edition, use Composer to write the page and clean it up a little by > hand. Composer makes way too many tags for simple things. For example > instead of a page break
sometimes it puts in >
or something similar. It only makes a couple of > meta tags and they are very easy to delete. One is worth keeping. It > also does stuff like > instead of , but they both still > work. Also Composer does tend to resize images when you save the HTML. I > usually correct that by hand. If you open the image in Netscape it will > show the dimensions in the title bar. > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ralvarez@........ (Raul Alvarez) Subject: Re: Easiest web site construction I've seen Date: Thu, 8 Oct 1998 17:56:03 -0600 (MDT) >So..... hows the seismograph progress going there, with or >without the giant IBM voice coil magnets? Hope it is coming >along. > >Thanks, Meredith Lamb > Hi Meredith, Not a whole lot of progress since my last posting to my web site. (www.frii.com/~ralvarez). Been real busy with other things this summer, but looking towards snowed in days to work on it!! Won't be long here in the mountains. Raul ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: PSN-L: Website Construction Date: Thu, 8 Oct 1998 19:46:43 +0000 Hello Raul, I visited your website, you have an agressive agenda! I love the 2-meter antenna on your "solar page", very sexy. Cool security pictures. Good luck with your STM. Walt Williams, 98.10.08 dfheli@.............. http://www.pacificnet.net/~dfheli ------- Forwarded Message Follows ------- Date: Thu, 8 Oct 1998 17:56:03 -0600 (MDT) To: PSN-L Mailing List From: ralvarez@........ (Raul Alvarez) Subject: Re: Easiest web site construction I've seen Reply-to: PSN-L Mailing List >So..... hows the seismograph progress going there, with or >without the giant IBM voice coil magnets? Hope it is coming >along. > >Thanks, Meredith Lamb > Hi Meredith, Not a whole lot of progress since my last posting to my web site. (www.frii.com/~ralvarez). Been real busy with other things this summer, but looking towards snowed in days to work on it!! Won't be long here in the mountains. Raul ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: robert barns <75612.2635@..............> Subject: Pymatuning event Date: Fri, 9 Oct 1998 11:59:09 -0400 Why was the Ohio 'quake called "Pymatuning"? Bob Barns _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lahr@.................. Subject: Re: Pymatuning event Date: Fri, 9 Oct 1998 10:34:02 -0600 (MDT) > > Why was the Ohio 'quake called "Pymatuning"? > Bob Barns > > _____________________________________________________________________ The location was just south of the south end of the Pymatuning reservoir, so Ed Cranswick et al. gave it that name. JCLahr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Pymatuning aftershock Date: Fri, 09 Oct 1998 15:16:55 -0600 Bob- Did you record the Pymatuning aftershock this morning? We have a link to the CERI records at the website: http://groundmotion.cr.usgs.gov/pym/pym.htm We have also included your records of the Pymatuning EQ and the Java teleseism at the website under PSN. -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Roger Baker Subject: The Hi-Q Gravimeter/Seismograph Date: Fri, 09 Oct 1998 17:41:13 -0500 Friends,=20 I wish to proudly announce that I finally got a web page up and running that illustrates many of the details of construction of my gravimeter/seismograph design that I discussed on this list some months ago.= =20 This is one big, slow-loading, long-winded page with enough text, digital photos, drawings and charts to satisfy the most curious, I hope, and with a chart of what I believe is the 5.6 magnitude quake of 11:54 GMT off the coast of Nicaragua this morning along with charts from Albuquerque, N.M., and Hockley, Texas for comparison. To access the page use the following URL: http://www.eden.com/~rcbaker Then go to the VERY BOTTOM of my file index and click "yourpage.html" dated Oct. 9. This will slowly load the latest version from today (I haven't learned how to delete the older stuff from my server yet. Just learning!).= =20 And you bet your boots I would love to get any comments from this group, critical or otherwise. Below you will find the introduction to my page as text. --Yours, Roger Baker ************************************************************************ The Hi-Q Gravimeter/Seismometer This is an amateur scientist-friendly design for an inexpensive vertical seismometer and gravimeter, based on a high-Q magnetic spring combined with force feedback, using optical displacement detection, and all mounted within a magnetically shielded isothermal enclosure.=20 =A0 This instrument, which I call the "Hi-Q", will work as either a teleseismic vertical seismograph or as a gravimeter. Its virtues are that it is relatively small, inexpensive, and easy to build. My design utilizes a very high-Q magnetic spring suspension in combination with active magnetic feedback in an isothermal enclosure to give a frequency response that extends to DC, making it also suitable for use as a gravimeter, able to see the daily background fluctuations in earth tide.=20 The only real problem with a gravimeter being used as a seismometer is that seismometers are designed to be so sensitive to vertical acceleration that slow drift and earth tides are likely to throw the readings off scale. A seismometer usually looks for the smallest possible acceleration changes, Since gravity is physically the same as acceleration, gravimeters are merely versions of seismometers with an infinitely long period response. My instrument is capable of recording acceleration or gravitational data at a fixed location for long periods of time with minor adjustment. My instrument works to detect teleseismic events that match known events recorded by official seismic stations.=20 The principle that=A0 I use employs the repulsion and attraction between magnets as a spring force to balance the force of gravity. I prefer this approach to the metal springs more commonly used in vertical seismographs. Such high-Q systems, even with fairly short periods, are an excellent match for force feedback, because the low mechanical losses associated with high-Q systems imply that they can efficiently capture kinetic energy over periods of time much longer than their own natural frequency. This are the basic virtue needed to sense slow teleseismic events with a physically small instrument.=20 My Hi-Q is fine-tuned to remain within its proper range, i.e. to keep the sensor output from going off-scale, by shifting the position of a ceramic magnet placed on top of the instrument. This is possible because the nickel alloy shield together with a large iron pipe which surrounds the both the instrument and the isothermal enclosure does not shield it completely from external magnetic influence. However, this double shield seems to be sufficient to prevent most practical problems arising from ambient magnetic field changes.=20 The Hi-Q is designed to operate from a small three amp, 12 VDC power supply. Most of the power actually goes to supply the resistance heater needed to maintain a constant temperature set just above ambient or room temperature inside the Styrofoam insulation enclosure. The entire seismograph feedback circuit by itself requires very little power. Since ceramic magnets such as those I use for the magnetic suspension are decidedly sensitive to temperature, my design must remain at a carefully controlled constant temperature. This can be easily done with good thermal insulation and a simple feedback thermistor/ temperature regulation circuit.= =20 Since both temperature control and magnetic shielding are necessary, my experimental designs have evolved in the direction of using a short stubby beam pivoting on a horizontal knife edge that can both be contained within a vertical nickel alloy magnetic shield tube 2.5 inches in diameter and 8 inches tall surrounded by the Styrofoam insulation enclosure.=20 =A0I anticipate the basic materials, exclusive of the magnetic shield and external electronics (mostly off the shelf from Radio Shack), to cost no more than about $25. Since everything is relatively small, it could also be sealed against barometric changes by hermetically sealing it inside a glass container at near atmospheric pressure.=20 I have also made progress in building a more miniaturized version of the instrument only about an inch in diameter, which appears to be nearer in its response characteristics to a geophone, but which remains sensitive to static displacements. The latter instrument is similar to the Hi-Q but smaller, and can be made to fit in a 6 inch tall section of iron pipe, 1.5 inch ID. Such a configuration is very compact and, with suitable adjustments, can be used at any angle from the vertical. My thinking is that the latter design is small enough so that these could be tilted at about a 45 degree angle and mounted in a common isothermal enclosure for full three axis recording with one instrument. For example, four of these could be aligned along the edges of a four-sided pyramid, and the outputs from opposite pairs of outputs added in such a way as to be able to calculate quake shocks as three-dimensional vectors of acceleration force. With computing power being relatively cheap, this should be practical.=20 *************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: The Hi-Q Gravimeter/Seismograph Date: Fri, 09 Oct 1998 21:29:44 -0600 Roger Baker, Congratulations on your new web site! Looks like one heck of a lot of work on your part. Magnificent mechanical drawing! Do suggest that the text be black instead of blue; kind of hard to read. (I also have Netscape) Its going to take awhile to read.......but.....in the meantime...... thanks for the huge data! Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Charles R. Patton" Subject: Re: The Hi-Q Gravimeter/Seismograph Date: Fri, 09 Oct 1998 21:59:38 -0700 Roger, I too, want to congratulate you on your site. And I too have to mirror Meredith=92s comment about the text. My old eyes have a hard time readin= g the light blue on black (Netscape 4.06 at work and 4.04 at home). Additionally, when I printed out the pages at work, the photos came through great on a B&W HP5SI at 600 dpi, but the text prints out in gray, making it hard to read on paper too. Keep up the good work, Charles R. Patton _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Roger Baker Subject: Re: The Hi-Q Gravimeter/Seismograph Date: Sat, 10 Oct 1998 01:13:39 -0500 OK OK, I hear you guys. I wanted something to set off the photos a little and black is great for that at least. Since the text is long, maybe I'll try black on pale green or something easy on the eyes like that. Meanwhil= e, I think you can go to the edit button on the browser toolbar and down to "select all" and then dump it in a text file like Word. Details, details.= ... Meanwhile, what I want most is for somebody to get curious enough to replicate and improve the thing now that they can see that it exists and probably does work, and is fairly easy to build, and so on. But thats mostly behind me now; the next personal challenge is all the other instruments that need designing and building. I have years of good stuff that it would be neat to put up on a Science Hacker web page. Like how to gold plate the surface of water, to mention one interesting phenomenon I discovered a few years back, plus lots of others... --Yours, Roger =20 =20 *************************************************************************= * At 09:59 PM 10/9/98 -0700, you wrote: >Roger, >I too, want to congratulate you on your site. And I too have to mirror >Meredith=92s comment about the text. My old eyes have a hard time readi= ng >the light blue on black (Netscape 4.06 at work and 4.04 at home). >Additionally, when I printed out the pages at work, the photos came >through great on a B&W HP5SI at 600 dpi, but the text prints out in >gray, making it hard to read on paper too. > >Keep up the good work, >Charles R. Patton > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the=20 >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: The Hi-Q Gravimeter/Seismograph Date: Sat, 10 Oct 1998 12:39:02 EDT Hi Roger and All I have built a gravitymeter using a vertical geophone. The geophone has the same equipment that a gravity meter has, a mass, the coil, suspended on a spring. I applied a voltage to the geophone coil to deflect the coil till the coil hit the stop at the end of the coil travel space. An electronic switch removes the voltage from the coil and hooks the coil output to a recording device, a digital oscillascope. The coil, returning to its natural at rest position, outputs a pulse. The voltage of that pulse is determined by the distance the coil travels within the geophone magnetic field to the at rest position. If the gravity is greater. the coil will be at rest lower in the coil travel area. If the voltage raises the coil to the top of the travel area, the resulting pulse will be larger. To make it more sensitive, I applied an opposite polarity voltage to the coul to deflect it to the lower stop. With more gravity, the resulting pulse will be lower voltage. I then subtract this pulse from the pulse caused by the coil deflected up I have recorded earth tides with this device. Temperature sensitive? yes! I have been hand calculating the temperature effects out of the results. I am building a gravitymeter using four geophones, two connected to the output in the opposite polarity to reduce the effect of seismic noise. This model is almost ready for testing. George Erich Seismic Exploration Acquisition Consultant P. O. Box 2011, Norwalk, CA 90650, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: bzimmerman@............ Subject: Re: Pymatuning aftershock Date: Sat, 10 Oct 1998 13:02:15 -0500 (EST) Edward: No, I did not record the Pymatuning aftershock here in Edinboro. I spoke with Nano Seeber who thought it looked like about an M1 event. I would not expect to pick up an event that small considering I am about 50 km from the epicenter. Guess its time to start thinking about some more sophisticated equipment. Thanks for posting those records. On Fri, 9 Oct 1998, Edward Cranswick wrote: Brian Zimmerman > Did you record the Pymatuning aftershock this morning? We have a > link to the CERI records at the website: > > http://groundmotion.cr.usgs.gov/pym/pym.htm > > We have also included your records of the Pymatuning EQ and the Java > teleseism at the website under PSN. > -Edward > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: LARGE QUAKE NOW Date: Mon, 12 Oct 1998 12:00:43 +1200 00:50 UTC 12 Oct 98 recording very large anplitude long period waves in Dunedin NZ Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Francesco" Subject: R: LARGE QUAKE NOW Date: Mon, 12 Oct 1998 01:07:54 +0100 Until now, no signal from Italy stations. Francesco _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: A Gravity meter using 4 Geophones Date: Sun, 11 Oct 1998 18:24:52 -0600 GeE777@....... wrote: > I have recorded earth tides with this device. Temperature sensitive? yes! I > have been hand calculating the temperature effects out of the results. I am > building a gravitymeter using four geophones, two connected to the output in > the opposite polarity to reduce the effect of seismic noise. This model is > almost ready for testing. > > George Erich > George Erich, I'd be very interested to hear/see more results of your combined 4 geophone instrument. What brand, frequency are you using? Seems like I recall Larry Cochrane using 2 geophones with a type of comparator electronics for regular seismic monitoring. Anyway, I hope the results are positive and its possible for you to submit the details somehow, sometime. Thanks for the new stuff! -- Meredith Lamb <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html and secondary site: http://www.geocities.com/ResearchTriangle/Facility/1739/index.html <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re large quake Date: Mon, 12 Oct 1998 12:36:50 +1200 00:50 UTC 12 Oct 98 recording very large anplitude long period waves >in Dunedin NZ >Dave Update ....... lookes like the quake is between me and antartica, and prob closer to me. The aslwww seismogram from Scott Base Antartica shows the best record and an early estimate of the event size is between M5.5 and M6.0 this puts the quake within 1500 km odd of me the geophones didnt show it but strong low freq S and Surface waves on my recorder indicate that its probably a shallow event ie. 33km or less. It appeares to have been followed by an aftershock some 15 minutes later Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: A Gravity meter using 4 Geophones Date: Sun, 11 Oct 1998 21:29:15 EDT Hello All One thing I failed to mention if someone wants to try this. When the voltage to deflect the coil is removed there is a strong short spike resulting from the emf collapsing around the coil. You don't want this as it is much stronger than the wavelet generated by the coil coming to rest. The electronic switch closed the circuit between the coil and the recording device after the spike and before the wavelet generated by the coil movement. To reduce errors, level the phone carefully and always keep on the same azimuth. I got 10 HZ phones But would like to try 4.5 HZ. In a message dated 10/11/98 5:31:31 PM Pacific Daylight Time, psnseismograph52@.......... writes: << I'd be very interested to hear/see more results of your combined 4 geophone instrument. What brand, frequency are you using? >> George Erich Seismic Exploration Acquisition Consultant P. O. Box 2011, Norwalk, CA 90650, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: A Gravity meter using 4 Geophones Date: Sun, 11 Oct 1998 18:50:01 -0700 (MST) George, Excellent device!!! How accurate is it? milligals or microgals? What if you wanted to build a nanogal gravimeter? Do such things exist? ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "It is easier to excuse an ignorant person who claims that theory is unnecessary and dispensable in his supposed practice, than to excuse a Sophist who concedes its value to the schools (as, perhaps, only a mental exercise) but who at the same time maintains that matters are quite different in practice- that as one leaves school to enter the world, one will realize one has been pursuing empty ideals and philosophical dreams- and, in a word, that what sounds good in theory is of no practical use." -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No Practical Use ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Re large quake Date: Sun, 11 Oct 1998 19:17:02 -0700 Dave I picked up moderate waves in California foothills @ 00:20:18 UTC also Barry David A. Nelson wrote: > > 00:50 UTC 12 Oct 98 recording very large anplitude long period waves > >in Dunedin NZ > >Dave > > Update ....... > > lookes like the quake is between me and antartica, and prob closer to me. > The aslwww seismogram from Scott Base Antartica shows the best record > and an early estimate of the event size is between M5.5 and M6.0 > > this puts the quake within 1500 km odd of me the geophones didnt show it > but strong low freq S and Surface waves on my recorder indicate that > its probably a shallow event ie. 33km or less. > > It appeares to have been followed by an aftershock some 15 minutes later > > Dave _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "J. D. Cooley" Subject: Re: Re large quake Date: Sun, 11 Oct 1998 20:22:40 -0700 Recent automated solutions from the International Data Centre: B Date Time Lat Lon Nph Depth Mag Region a 1998/10/12 00:28:49.0 18.31N 145.82E 7 267.2 mb 3.4 Mariana Islands a 1998/10/11 23:57:30.3 56.21S 143.31W 13 mb 4.7 Pacific-Antarctic Ridge a 1998/10/11 23:36:24.6 56.76S 142.77W 11 mb 4.7 Pacific-Antarctic Ridge a 1998/10/11 21:45:22.4 27.38S 62.55W 8 mb 4.7 Santiago Del Estero Prov., Arg. a 1998/10/11 21:43:13.8 27.72S 63.69W 16 mb 5.6 Santiago Del Estero Prov., Arg. I don't see the Mb5.6 on the aslwww seismograms, but certainly see the Pacific-Antarctic Ridge. At 07:17 PM 10/11/98 -0700, you wrote: >Dave > I picked up moderate waves in California foothills @ 00:20:18 UTC >also > Barry > > >David A. Nelson wrote: >> >> 00:50 UTC 12 Oct 98 recording very large anplitude long period waves >> >in Dunedin NZ >> >Dave >> >> Update ....... >> >> lookes like the quake is between me and antartica, and prob closer to me. >> The aslwww seismogram from Scott Base Antartica shows the best record >> and an early estimate of the event size is between M5.5 and M6.0 >> >> this puts the quake within 1500 km odd of me the geophones didnt show it >> but strong low freq S and Surface waves on my recorder indicate that >> its probably a shallow event ie. 33km or less. >> >> It appeares to have been followed by an aftershock some 15 minutes later >> >> Dave > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Red Puma Date: Sun, 11 Oct 1998 21:00:35 -0700 I lost the bookmark. Could someone pass it to me? Thanks Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: peaches@............ (Donna Whitaker) Subject: Re: Red Puma Date: Sun, 11 Oct 1998 18:12:15 -1000 (HST) Barry, http://seismo.ethz.ch/redpuma/redpuma_ami_list.html >I lost the bookmark. Could someone pass it to me? > Thanks > Barry > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: Red Puma Date: Sun, 11 Oct 1998 22:11:00 -0600 barry lotz wrote: > I lost the bookmark. Could someone pass it to me? > Thanks > Barry > http://seismo.ethz.ch/redpuma/redpuma-ami-list.html Use_ where- is shown. -- Meredith Lamb <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html and secondary site: http://www.geocities.com/ResearchTriangle/Facility/1739/index.html <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>  

barry lotz wrote:

I lost the bookmark. Could someone pass it to me?
                    &nb sp;                    &nbs p; Thanks
                    &nb sp;                    &nbs p;   Barry
 
http://seismo.ethz.ch/redpuma/redpuma-ami-list.html
Use_ where- is shown.

--
Meredith Lamb
<><><><><><><><><><><><><><><><><><><><><><><><>< ;><><><><><><><><><><><>
Main Web site:  http://www.users.uswest.net/~psnsei smograph52/Index.html
                    &nb sp;         and secondary site:
   http://www.geocities.com/Research Triangle/Facility/1739/index.html
<><><><><><><><><><><><><><><><><><><><><><><><>< ;><><><><><><><><><><><>
  From: barry lotz Subject: Re: Red Puma Date: Sun, 11 Oct 1998 21:23:47 -0700 Thanks much! Barry >Donna Whitaker wrote: > > Barry, > > http://seismo.ethz.ch/redpuma/redpuma_ami_list.html > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: A Gravity meter using 4 Geophones Date: Mon, 12 Oct 1998 05:34:51 EDT Hi John & All I started experimenting with this in my lab just before my retirement. Then I was called away to another job. I know that everything seemed to interfere with my results. Movement, rotating, etc. In a message dated 10/11/98 6:51:01 PM Pacific Daylight Time, hernlund@....... writes: << George, Excellent device!!! How accurate is it? milligals or microgals? What if you wanted to build a nanogal gravimeter? Do such things exist? >> <> George Erich Seismic Exploration Acquisition Consultant P. O. Box 2011, Norwalk, CA 90650, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "J. D. Cooley" Subject: Large quake Date: Mon, 12 Oct 1998 05:02:08 -0700 It is interesting that the quake that occurred at approx. 23:50 UTC on 10/11/98 has not been reported by any agency (except the IDC) even though it has been over 12 hours now! I realize that the guys/gals at USGS are in bed, but usually there are a few automated, at least, solutions posted to RedPuma with a quake this size. Just observing! "JD" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Large quake Date: Tue, 13 Oct 1998 07:18:54 +1200 At 05:02 AM 10/12/98 -0700, you wrote: >It is interesting that the quake that occurred at approx. 23:50 UTC on >10/11/98 has not been reported by any agency (except the IDC) even though it has been over 12 hours now! >I realize that the guys/gals at USGS are in bed, but usually there are a few >automated, at least, solutions posted to RedPuma with a quake this size. >Just observing! >"JD" yeah !!! its common for that to happen wit h quakes in my part of the world. there are many M5-M6 and a reasonable munber of M6++ events that NEVER show up on the NEIC listings. I find it frustrating but as there is nothing i can do abt it i jst live with it. Yesterday's event that u speak of worked out to be ~Ms5.8 + - 0.2 as recorded on my SDR system. i apologise for the time error i reported yesterday too, i was 1 hr in advance, we jst changed to daylite time and i looked at the wrong clock (smile) my i hate daylight saving time !! Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Gravimeters Date: Mon, 12 Oct 1998 18:31:04 -0500 (CDT) Re: high resolution gravimeters The most recent commercial gravimeters have nanogal resolution at about 1/nanodollar prices. Some are absolute meters, the more clever of which tracks a falling corner cube reflector with a lasar interferometer to measure the acceleration of G. It is curious to "hear" it "plink" away while at work, as a little elevator device raises the cube in the vacuum column and drops it repeatedly about every 10 seconds. The lasar interferometer uses a reference mass on a "superspring" in the base to eliminate seismic disturbances. A computer does the statistics in real time, as well as correcting for environmental noise (temperature, etc.) After about 24 hours, sub-microgal noise levels are realized. For reference, earth tides are of the order of 100 to 200 microgals, where a microgal is an acceleration of 10^-8 m/sec^2. The instrument costs in excess of $100k. The highest resolution instruments levitate a superconducting sphere to measure G. A combination of magnetic and electrostatic feedback make detection levels of less than 1 nanogal (10^-11 m/sec^2) possible, with noise level power spectra of 10^-3 microgal^2 per cycle/hour possible at periods longer than 0.2 cycle/hour. With these instruments, many natural effects have to be removed, including the solid earth tides, ocean loading, barometric loading (0.3 microgal/millibar), etc. More affordable instruments are realized by incorporating electrostatic feedback into LaCoste-style instruments. Even the best Broadband vertical seismometer, the STS-1V, produces earth-tide data with microgal resolution, and its ultra long period seismic data is useful for studying the gravitational oscillations of the earth excited by large earthquakes. At the IRIS stations, the 24-bit digitizer resolution of the ULP data (at 150 seconds) is about 100 counts / microgal. The long period (20 to 60 second) surface waves produced by moderate (M=6 +) quakes are often about the amplitude of the earth tides. at 150 seconds. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Large quake Date: Mon, 12 Oct 1998 17:35:04 -0700 (MST) On Tue, 13 Oct 1998, David A. Nelson wrote: > >I realize that the guys/gals at USGS are in bed, but usually there are a few > >automated, at least, solutions posted to RedPuma with a quake this size. > yeah !!! its common for that to happen wit h quakes in my part of the > world. there are many M5-M6 and a reasonable munber of M6++ events that > NEVER show up on the NEIC listings. I find it frustrating but as there is > nothing i can do abt it i jst live with it. This worries me, because I like to work with statistical analysis of seismicity, which depends very strongly on the accuracy, thoroughness, and coverage of the collected data. But, like you said, we get what we get... > Yesterday's event that u speak of worked out to be ~Ms5.8 + - 0.2 as > recorded on my SDR system. We all need more stations all over the globe to improve coverage. It would be nice to have as many stations as would be needed so that no magnitude 2.0 or greater event would escape detection anywhere... But we are probably talking mega-bucks here... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ "It is easier to excuse an ignorant person who claims that theory is unnecessary and dispensable in his supposed practice, than to excuse a Sophist who concedes its value to the schools (as, perhaps, only a mental exercise) but who at the same time maintains that matters are quite different in practice- that as one leaves school to enter the world, one will realize one has been pursuing empty ideals and philosophical dreams- and, in a word, that what sounds good in theory is of no practical use." -Immanuel Kant, On the Proverb: That May be True in Theory, But Is of No Practical Use ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Geophone amps Date: Mon, 12 Oct 1998 19:41:46 -0500 (CDT) Greg, The micropower seismic preamp that we use here (I assume you saw my description of it, which I can repeat if necessary) has been made here and elsewhere, and was also made by Sprengnether at one time. I think they still make a pre-amp, but I don't know if it is micro-power. (www.sprengnether.com). The amplifier is simple enough that it can even be made on a perforated PC board in a few hours with just two MC1776 Amps, but using fixed gain/filter stages for simplicity and be able to run from photo-lithium batteries for a few years. I guess I could just do it and document it if there is any interest. The battery operation greatly simplifies the remote installation. I actually have several versions of the 4 amplifier design that were made by students on perf-board to fit inside the 1" diameter case of hydrophones (we once tried to detect tidal strains by using an air-gun in a well and timing the seismic pulse to stations several kilometers away). Maybe I should photograph the board and post it with documentation. The only consideration for use with a geophone is that more gain will be needed. We use 60 db (x 1000) and up with a L4-C with a 100v/m/sec pad. A geophone may need 10x more gain. The pre-amp can be configured for 80db, or x100 per stage, Its filters can also be made low pass at 1 hz or less to provide more response to distant earthquakes. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Large quake Date: Mon, 12 Oct 1998 19:54:23 -0500 (CDT) In the defense of the USGS, I don't think that they have recently missed cataloging any magnitude 6 earthquake. The NEIS HAS listed the events near the Pacific-Antartic ridge of Oct. 11, at magnitudes 5.7 and 5.5, as well as a rare event this morning near the Artic circle, a M=4.8 north of Severnaya Zemlya. I believe that their current global catalogue is quite complete for events greater than magnitude 5. On the other hand, the earth could still use better coverage with calibrated broadband stations, which is where the PSN can make a serious scientific contribution. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: Large quake Date: Tue, 13 Oct 1998 14:28:11 +1200 At 07:54 PM 10/12/98 -0500, you wrote: >In the defense of the USGS, I don't think that they have recently missed >cataloging any magnitude 6 earthquake. The NEIS HAS listed the events >near the Pacific-Antartic ridge of Oct. 11, at magnitudes 5.7 and >5.5, as well as a rare event this morning near the Artic circle, >a M=4.8 north of Severnaya Zemlya. I believe that their current >global catalogue is quite complete for events greater than magnitude 5. >On the other hand, the earth could still use better coverage with >calibrated broadband stations, which is where the PSN can make a >serious scientific contribution. >Regards, >Sean-Thomas Sorry Sean i have to STRONGLY dispute that as said in my previous e-mail there are many M5 - M6 and the occassional M6+ event in this part of the world that goes unnoticed. i could produce quite a substantial list of these events over even the last 10 yrs since i have been seriously involved in seismic recording. here is one example that didnt make it to the NEIC listing..... 210498 1134 6.3 39.02S 174.92E, 245KD, 33 km WSW of Taumarunui, Felt from Christchurch to Taranaki and Hawke's Bay. Shaking felt for about 45 seconds in Wellington (New Zealand) the only M6+ event onland in NZ so far this yr and it was missed IDC did log it but at a ridiculously low magnitude and very poor location now there have been at least 5 x M5.0 + events this yr alone that didnt make it to the NEIC d/m/y NZST Mb Lat Long Depth 090298 0626 5.3 45.06S 170.47E, 12KD, 250298 0517 5.4 41.92S 174.19E, 21KD, 250398 2018 5.0 38.29S 176.29E, 05KD, 060598 2056 5.0 44.91S 167.97E, 33KD, 140598 2127 5.0 38.47S 177.17E, 58KD, now this isnt all the NEIC's fault, from observations... the NZ seismo observatory dont seem to get the info passed on to the USA agencies very well. WHY ?? i dont know jst seems to be a lack of communications. im jst an amateur *smile* Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Large quake Date: Mon, 12 Oct 1998 21:07:40 -0600 Thank you, Sean-Thomas. S-T Morrissey wrote: > In the defense of the USGS, I don't think that they have recently missed > cataloging any magnitude 6 earthquake. The NEIS HAS listed the events > near the Pacific-Antartic ridge of Oct. 11, at magnitudes 5.7 and > 5.5, as well as a rare event this morning near the Artic circle, > a M=4.8 north of Severnaya Zemlya. I believe that their current > global catalogue is quite complete for events greater than magnitude 5. > > On the other hand, the earth could still use better coverage with > calibrated broadband stations, which is where the PSN can make a > serious scientific contribution. > > Regards, > Sean-Thomas > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Large quake Date: Mon, 12 Oct 1998 21:14:09 -0600 Dave- Interesting observations. I'll pass them along. -Edward David A. Nelson wrote: > At 07:54 PM 10/12/98 -0500, you wrote: > >In the defense of the USGS, I don't think that they have recently missed > >cataloging any magnitude 6 earthquake. The NEIS HAS listed the events > >near the Pacific-Antartic ridge of Oct. 11, at magnitudes 5.7 and > >5.5, as well as a rare event this morning near the Artic circle, > >a M=4.8 north of Severnaya Zemlya. I believe that their current > >global catalogue is quite complete for events greater than magnitude 5. > >On the other hand, the earth could still use better coverage with > >calibrated broadband stations, which is where the PSN can make a > >serious scientific contribution. > >Regards, > >Sean-Thomas > > Sorry Sean i have to STRONGLY dispute that as said in my previous > e-mail there are many M5 - M6 and the occassional M6+ event in this part > of the world that goes unnoticed. > > i could produce quite a substantial list of these events over even the > last 10 yrs since i have been seriously involved in seismic recording. > > here is one example that didnt make it to the NEIC listing..... > > 210498 1134 6.3 39.02S 174.92E, 245KD, 33 km WSW of Taumarunui, Felt > from Christchurch to Taranaki and Hawke's Bay. Shaking felt for about 45 > seconds in Wellington (New Zealand) > > the only M6+ event onland in NZ so far this yr and it was missed > IDC did log it but at a ridiculously low magnitude and very poor location > > now there have been at least 5 x M5.0 + events this yr alone that > didnt make it to the NEIC > > d/m/y NZST Mb Lat Long Depth > 090298 0626 5.3 45.06S 170.47E, 12KD, > 250298 0517 5.4 41.92S 174.19E, 21KD, > 250398 2018 5.0 38.29S 176.29E, 05KD, > 060598 2056 5.0 44.91S 167.97E, 33KD, > 140598 2127 5.0 38.47S 177.17E, 58KD, > > now this isnt all the NEIC's fault, from observations... the NZ > seismo observatory dont seem to get the info passed on to the USA > agencies very well. WHY ?? i dont know jst seems to be a lack of > communications. > im jst an amateur *smile* > > Dave > > Co-ordinator: > New Zealand > Public Seismic Network > Dave A. Nelson ZL4TBN > 24 Jensen St., > Green Is., Dunedin, > South Is.. New Zealand. > > http://psn.quake.net/dave/home.htm > > IF there indeed are other parallel universes... I can now rest in the > knowledge, that in at least one of them, I am filthy rich and drive a red > Ferrari > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "James M Hannon" Subject: Re: Large quake Date: Tue, 13 Oct 1998 07:26:57 -0500 That explains why I was confused. I looked at my watch and thought either my watch was set wrong or you had discovered a new way to predict quakes :)! Jim Hannon "David A. Nelson" on 10/12/98 02:18:54 PM Please respond to PSN-L Mailing List To: PSN-L Mailing List cc: Subject: Re: Large quake i apologise for the time error i reported yesterday too, i was 1 hr in advance, we jst changed to daylite time and i looked at the wrong clock (smile) my i hate daylight saving time !! Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. _____________________________________________________________________ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "J. D. Cooley" Subject: Re: Large quake Date: Tue, 13 Oct 1998 06:39:27 -0700 At 02:28 PM 10/13/98 +1200, you wrote: [good sized snip] > >here is one example that didnt make it to the NEIC listing..... > >210498 1134 6.3 39.02S 174.92E, 245KD, 33 km WSW of Taumarunui, Felt >from Christchurch to Taranaki and Hawke's Bay. Shaking felt for about 45 >seconds in Wellington (New Zealand) The University of Washington (IRIS) has data and some very impressive seismograms of a quake occurring on (using your convention for date): 200498 23:34:13.0 38.31S 173.8E 245KD M5.5 Could this be the quake you are referring to? I don't know if the USGS has it in any of their listings, but the most impressive seismogram of this quake was by CTAO which is listed as: Charters Towers, Queensland, Australia and below that is: IRIS-USGS. It also says that this seismometer is on the BRS Network which is the University of Queensland, Brisbane, Australia. I didn't check the other quakes you listed below, just the one. "JD" > > the only M6+ event onland in NZ so far this yr and it was missed > IDC did log it but at a ridiculously low magnitude and very poor location > > now there have been at least 5 x M5.0 + events this yr alone that >didnt make it to the NEIC > >d/m/y NZST Mb Lat Long Depth >090298 0626 5.3 45.06S 170.47E, 12KD, >250298 0517 5.4 41.92S 174.19E, 21KD, >250398 2018 5.0 38.29S 176.29E, 05KD, >060598 2056 5.0 44.91S 167.97E, 33KD, >140598 2127 5.0 38.47S 177.17E, 58KD, > > now this isnt all the NEIC's fault, from observations... the NZ >seismo observatory dont seem to get the info passed on to the USA >agencies very well. WHY ?? i dont know jst seems to be a lack of >communications. > im jst an amateur *smile* > >Dave > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: taber@............. (John Taber) Subject: Re: Large quake Date: Wed, 14 Oct 1998 12:25:50 +1300 Dave Nelson wrote: >Sorry Sean i have to STRONGLY dispute that as said in my previous >e-mail there are many M5 - M6 and the occassional M6+ event in this part >of the world that goes unnoticed. > > i could produce quite a substantial list of these events over even the >last 10 yrs since i have been seriously involved in seismic recording. > >here is one example that didnt make it to the NEIC listing..... > >210498 1134 6.3 39.02S 174.92E, 245KD, 33 km WSW of Taumarunui, Felt >from Christchurch to Taranaki and Hawke's Bay. Shaking felt for about 45 >seconds in Wellington (New Zealand) > > the only M6+ event onland in NZ so far this yr and it was missed > IDC did log it but at a ridiculously low magnitude and very poor location > >now this isnt all the NEIC's fault, from observations... the NZ >seismo observatory dont seem to get the info passed on to the USA >agencies very well. WHY ?? i dont know jst seems to be a lack of >communications. I think there are several reasons that earthquakes from the southwest Pacific don't show up in the NEIC catalogue. The first is that as Dave mentioned, NEIC magnitudes are lower than NZ local magnitudes. For example, the IRIS magnitude for the above event is 5.5 (note that the above time and date is NZDT, it's 200498 2334 UTC). I don't know the reason for the mismatch, but I think the NZ local magnitude gives a better estimate of the moment magnitude than does the NEIC magnitude. This means that many events in the M5-6 range according to the NZ scale are below M5 on the NEIC scale and so don't get included. The NZ Seismological Observatory sends preliminary locations of larger events to NEIC every two weeks. This means the NZ locations won't show up in the daily listings and maybe not the weekly but they should be in the monthly listings. Cheers, John Taber School of Earth Sciences Victoria University of Wellington New Zealand _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: VBB Leaf Spring Mount Question Date: Tue, 13 Oct 1998 19:49:16 -0400 Sean: I am looking at your "Hinge and Leaf Spring Mounting Detail" (large scale). I have a small question on the alignment of the spring attachment. I understand the overall concept, my question has to do with the orientation of the leaf spring flexures with the 3/16" square tube. It appears that your drawing shows the sq tube rotated slightly to accommodate the curvature of the spring; that is, the flexure does not form a 90 degree angle with the face of the square tube. Looking at the photographs, I can't make out the actual detail of the flexure/tube alignment. Thanks in advance Rex Klopfenstein, Jr Bowling Green, OH _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Geophone amps Date: Tue, 13 Oct 1998 19:29:05 -0500 (CDT) Rick. Here is the info I previously posted about the amplifier: Re. micropower seismic amplifier: (Oct12rev). Since 1981 we have been using a micropower seismic amplifier for all the telemetry stations. It is based on the LM4250CN micropower amplifier. It uses four amplifiers, with the total current drain of 80 microamps at +-4.05 volts. The first two amps are for DC gains of 18 to 54 db and 6 to 36 db. The second two amps are a 4-pole low pass filter at 20 hz. The first and second gain stages are AC coupled at a 60-second corner to remove the DC offset, and the output is similarly AC coupled for input to the VCO. The noise referred to the input at 60db (gain of 1000) is 1 microvolt. For most stations using the L4-C seismometer (pre-scaled for 100v/m/s output) the gains range from 60 to 72 db. The additional gain available up to 90 db (gain of 31 600) is useful for smaller geophones. The schematic is posted on the PSN info page at: http://www.eas.slu.edu/People/STMorrissey/index.html The original is an old pencil drawing, so the quality is not very good. If you want to send a SASE with 4 or 5 stamps, I can mail a copy, along with the circuit board artwork. I will try to post a photo of the board. I have also started a CAD redrawing of it.... (Unfortunately I don't have time to get into the hardware business, like getting the board reprinted for sale. And I expect that we would need an interest in 50 assembled boards to be able to have Sprengnether make them and sell them, for which they would probably charge $100 per. I will ask them about it.) For use as an isolated amplifier, (installed in the borehole near the seismometer or geophone), photo-lithium batteries can be used. A battery pack of 6 of the the AA size, configured for +,- 4.8 volts, will provide 80 microamps for 30 months or more. The AA size costs about $6 per pair. Larger lithiums will last for years, or the shelf life: 80 microamps is about the level of the internal leakage. Motorola makes a pin-compatible micro-power amp, the MC1776, available from Newark. The main caveat for using these micro- powered (we run them at 20 microamps) amps is that soldering them into a circuit board usually will make them very noisy, so sockets are always used. In fact, we test the amplifiers for noise, and use the quietest as the first amplifier. We will go through a tube of 50 amps, and maybe 10 will have about 1/10th the noise of the rest, and maybe another 10 will be 10x noisier than the mean, and get used in the milliwatt DC-DC converter instead of the seismic amp. The other important detail for electronics buried in a sealed container with the seis or geophone is that it must be kept VERY dry, which requires fresh active desiccant AND a Humidity indicator. We use the paper-strip type with graduations of 10% steps. In the "mug shot" on my web home page you can see a container of fresh desiccant near my right knee, and the ABS "pipe vault" covers the hook on my left arm. The cap of the "pipe vault" is attached with a 3" hubless clamp, which is never reused in the remote sites that are opened only every other year. The complete telemetry system is in the aluminum container that is about the size of a "Pringles" can. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Geophone amps Date: Wed, 14 Oct 1998 00:50:59 +0000 S-T Morrissey wrote: > (Unfortunately I don't have time to get into the hardware > business, like getting the board reprinted for sale. And I > expect that we would need an interest in 50 assembled boards to > be able to have Sprengnether make them and sell them, for which > they would probably charge $100 per. I will ask them about it.) I emailed Sprengnether on Sunday. No response yet. Maybe if a couple of people hit them at once, it might peak their interest a bit more. I may end up using Larry's amp yet. If these things can't be had easily for a reasonable price. I might try asking if someone would build one for a reasonable fee, based on the schematic on Sean-Thomas's web site. The parts look pretty cheap, but if only 1 in 50 amps is good enough to use... ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: VBB Leaf Spring Mount Question Date: Tue, 13 Oct 1998 19:55:43 -0500 (CDT) Rex, The drawing is not perfect. The square tube is orthogonal with the end of the spring, and the flexures are at right angles to it. But this puts the flexure at an angle from the vertical, since the ends of the spring will be to the left of the fixed rod at the upper end, and to the right of the fixed rod at the lower end (here again, the drawing detail is wrong: the lower end is too long and low). The approximate alignment of the flexures is along a line drawn between the centerlines of the two fixed rods. But since the fixed rods are free to rotate when the spring is installed, they will align themselves. I usually "twang" the spring a few times after installation so it will find its most relaxed position. I'm taking notes for updating the drawing. I need to do an overhead view to clarify many details. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Geophone amps Date: Tue, 13 Oct 1998 20:06:56 -0500 (CDT) Greg, I need to clarify the selection of amplifiers for noise: they are all good enough to use, but when the chance to push the envelope gets into the hands of a perfectionist, why not quickly screen them? The main point was that soldering them in to the PC board usually makes them noisier. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lahr@.................. Subject: NEIS Catalog Date: Thu, 15 Oct 1998 10:56:29 -0600 (MDT) I checked with Waverly Person about the event of April 21, 1998 at 39.02S 174.92E that was not included in any catalogs. The problem was human error -- it happens some times. This event will be included in the monthly listing for April 1998. I'm not sure why the other five mb 5+ events were not published, although their actual magnitudes could be much smaller. It could be due to very poor solution quality. Waverly told me that mb magnitudes are systematically too large if computed for regional distances (anything less than about 16 degrees). This may account for the difference between the Wellington mb's and the final magnitude determined by NEIS. Also ML magnitudes are not used if the depth is greater than 33 km (except for Alaska, where the depth can be as great as 70 km). Coda magnitudes are another option and are not limited by depth. Dave Nelson, if you see this happen again, let me know right away while the event is still in the system and there are printouts with notes to look at. I'll see if I can find out what is happening. Cheers, JCLahr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: VBB Transfer Function References Date: Thu, 15 Oct 1998 21:23:30 -0400 Sean I have been reading your draft of "A High Resolution Broadband Vertical Seismometer Constructed from Hardware Store and Consumer Electronics Components" list on your page. Prior to the section describing the "The Transfer Function", a reference is made to two articles (thesis?). One is by J.M. Stein and the other by Wielandt and Steim. Could you provide a complete reference to these two articles? Thanks Rex Klopfenstein, Jr Bowling Green, OH _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: SVJrH Gilroy Seismic/Weather Station Date: Thu, 15 Oct 1998 20:56:08 -0600 Jan & Ted- Have either of you heard from AGU about your December poster presentation with the school? I have been distracted by various things such as the Pymatuning EQ , but I think we should start checking with AGU about getting passes for a bunch of the students. Please let me know about what the status is. -Edward Jan Froom wrote: > Larry - Steve.... I've decided to put my commercial vertical & horizontal > devices over at SVJH along with Dick's shoe box horizontal & maybe one of my > home brew horizontals too. After all, it a School of Science & Technology ! > Let's give them some Technology along with the science....... > > What I need to know from Larry is.... What all will I need to setup something > like you and Steve are suggesting ? Do I need to buy one of your (Larry's) > cards ? Or can I keep using EMON ? What size PC ? How will it get linked > into the Weather Internet Server ? How will the kids interface to it. ? Are > you going to come down to help me set it up.... maybe I should say, are you > going to come down so I can watch you set it up ? I think I can spring for > Dinner and your gas ! > > Also wondering if you've tried the WWVB RS232 Clock (like the Radio Shack one > except with a RS232 interface), I have and it's duck soup to use.... > > We ordered the Weather Station last week..... and while I know you two boo & > hiss the fact that it comes with WINDOWS 98 you have to remember we're not as > sharp as you two... And I'm trying to spare Larry the trips from Redwood City > to Gilroy. The school has practically given me a whole room to set up the > Seismic & Weather Station in and it's all wired for the internet. > > I appreciate all of your help and enthusiasm and am really excited about > getting this set up going at SVJH! > > Jan > "Credo Quia Absurdum" > I Believe Because It Is Absurd -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Maximumius Glutomious Alligator bites Date: Thu, 15 Oct 1998 21:41:52 -0600 Meredith- Sorry about the delay in responding to your question about what happened during the Pymatuning EQ aftershock investigation, but here are some email bytes: In the middle of Sept, I spent a couple of weeks in a kind of spiritual retreat, including 8 days of solitary existence in the mountains inhabiting a circle 108' in diameter during which I fasted for 5 days ... the day after I returned to my apartment in Golden, 25 Sep, there was a magnitude 5.2 earthquake in Pennsylvania (eastern US), and I spent the next week in a motel room at the epicentral area, surrounded by computers in my motel room, swigging coffee and chomping chocolate bars 18-20 hrs/day, with TV stations arriving in droves to interview us, including a helicopter with the camera crew that landed in the field behind the motel -- it was like James Bond ... I was waiting for Pussy Galore to jump out. Check out: ; we put this website together in the field during the aftershock investigation which, as far as I know, is a first (also, there were no aftershocks, which is also a first; so we had a virtual aftershock study .... I'll forward the email about my virtual love affair). Subject: Re: The Show Date: Fri, 09 Oct 1998 21:31:27 -0600 From: Edward Cranswick Organization: US Geological Survey, Golden, CO To: Debi Kilb CC: Ann Metzger , Joan Gomberg , john armbruster , Jon Cox , Katherine Stanley , Kaye Shedlock , leonardo seeber , "Mark E. Meremonte" , "Mitchell M. Withers" , Stephen Horton , bodin@........................ References: 1 Debi- The show went well. I hung the bra just to right of the projector screen but didn't mention it until the very end of the talk, sort of as an afterthought (despite your recomendation, I decided not to model it with my USGS hat and sweatshirt during the presentation). I explained how I found it hanging on the outside of my motel room door and that you denied any knowledge of it. I advanced my theory that, after collapsing in semi-coma sometime after 3:30 AM from too much nerding-out in my motel-room computer center, I had been abducted by Space Alieness's in flying saucers and forced to commit unspeakable sexual acts (I considered consulting a hypnotherapist to have these repressed X-rated memories restored). I also, for the sake of "scientific and empirical" completeness reported John & Nano's alleged story that they had discovered the bra under the bed in their room and had hung it on my door in honor of my advanced seismological studies at Lamont -- the only award I have so far received from that institution for the 4 years I trudged towards an infinitely distant Ph.D. Other than on matters regarding this vital issue, Kaye and John did most of the talking (see revised talk promo below), and I did most of the gesticulating. I think the point was well made that the Web can and should be used to dynamically interact with the public during a mainshock/aftershock sequence. As I remarked at a meeting today about our seismic hazard investigations in Seattle, many PIs have a very "static" view of their research and their audience (whoever they think that is: it is not clear) -- it is as if they don't really believe that there will be an earthquake there ... if so, why are we being funded? I did make some other remarks about the increasing virtuality of it all, particularly of reality, but I did not advance the idea of a website, the Pymatuning one or others in general, as being a dynamic document that automatically gives credit to all concerned. ... and then this morning there was the aftershock, and so the show goes on ... -Edward Debi Kilb wrote: > Edward, > > So ... how did it go yesterday? > > Cheers, > Debi > Subject: > ENTRY LEVEL CONFERENCE ROOM: PYMATUNING EATHQUAKE TALK ***TODAY***] > Date: > Thu, 08 Oct 1998 11:56:59 -0600 > From: > Edward Cranswick > Organization: > US Geological Survey, Golden, CO > To: > geo_haz_gld@.................. > > > > > Because of the continuing absence of aftershocks, we are trying to keep > things rolling by moving the talk to the > > ENTRY LEVEL CONFERENCE (LUNCH) ROOM > (ANOTHER change of venue) > Thursday, 8 Oct 1998, 2:00 PM > > (actually the people -- Susan Rhea, Pam Detra, and Lynn Highland -- > putting the booth together for USGS GeoHazards at GSA kindly allowed us > to interrupt their schedule for an hour; thank you) > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > Subject: > ***TODAY*** PYMATUNING EATHQUAKE TALK ***TODAY*** > Date: > Thu, 08 Oct 1998 09:30:10 -0600 > From: > Edward Cranswick > Organization: > US Geological Survey, Golden, CO > To: > geo_haz_gld@.................. > > > > Jon Cox, Kaye Shedlock, Mark Meremonte (special guest appearance) and > Edward Cranswick will present a summary of the Pymatuning Earthquake. > Kaye will present the material about the mainshock and tectonic > background that she prepared for briefings. Mark will present himself. > Jon and Edward will focus on the virtual aspect on of the event, > including the field investigation and website: > > > THE 1998 SEP 25 PYMATUNING EARTHQUAKE AND ITS VIRTUAL AFTERSHOCK > SEQUENCE > > Thursday, 8 Oct 1998, 2:00 PM > (change of venue) > 4th Floor Conference Room > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". meredith lamb wrote: > Edward Cranswick, > > Uhhh.....is there any cure out there in Ohio, for your bites? > The weather back here in Colorado was only in the 50's today, > and perhaps upon your return, the cool, will sooth the ruffles? > Ha. > > Don't hear anything of aftershocks. Afterbites? Ha. > > Presume they send you off anywhere for these mainland quakes. > Any interesting or noteworthy history stories to pass on of your > experiences? Imagine some of the storys maybe quite interesting. > Do you take gobs of equipment? Government plane? > > Thanks, > > Meredith Lamb > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Phantom Postings Date: Thu, 15 Oct 1998 22:09:16 -0600 Bob- I have been meaning to reply to your message, which arrived during the height of my email difficulties, for months, but I have procrastinated as usual. With respect to Mono Lake, the first Californian and, hence, "real" earthquake I chased was the 25 May 1980 Mammoth Lakes sequence that consisted of 3 M6+ events that Sunday and the largest, a M6.4 which I felt in the town of Mammoth and which is still the largest earthquake I have experienced (most seismologists are to earthquakes like Catholic priests are to sex -- the authorities on the subject though they have never experienced it), the following Tuesday. All the skiers had vacated the town of Mammoth on Sunday night and been replaced by seismologists on Monday morning. I am conjecturing from your name that you are of Armenian descent ... and that is another story of earthquakes which, though they have wreaked havoc in Armenia, constititute only a part of the past and recent drama of the Armenian people. So what were you doing in Mono Lake with Lou Pakiser? I saw him two months ago, in August 1998, at the retirement party for my ex-father-in-law, Jack Evernden, but since I was quite distracted at the time by the presence there of my Russian ex-wife and ex-stepdaughter and their new husband/stepfather, I did not think of mentioning your email to Lou. -Edward Robert Avakian wrote: > I, too am seeing the same thing, I write and don't see it. However, I > thought my posts were simply being edited out by the moderator. Now I > wonder. You seem to be coming in loud and clear. > > It almost looks like the software omitts the originating address when it > sends the meassage out to the list. > > Did you see my post about Mono LAke in conjunction with the Owens lake > rewatering post? I figured they edited it out as tooo far afield. > > I was at the lake in 1970 with Lou Parkeser(sp?) from Menlo Park and > about five USGS trucks for a weekend of seiemic work. There were still > a number of bird carasses on shore from some water charges they had set > a year or two before. At 5:30 AM, we totally overloaded Lee Vining's > resources, especaily the cafe. > > Take care > > Bob Avakian -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Geophone amps Date: Fri, 16 Oct 1998 04:55:19 +0000 S-T Morrissey wrote: > > Greg, > I need to clarify the selection of amplifiers for noise: they > are all good enough to use, but when the chance to push the Good, that'll mean that mine will be slightly cheaper. 4 x $2.50 amps is one thing, but more than 50 is absurd for the benefits to me. > The main point was that soldering them in to the PC board usually > makes them noisier. A lot of these messages get kept in my "PSN-archive folder" because of useful little bits like that. I got a response from Sprengnether today. They sent a simple fax, that looks like it came out of a brochure. It's a little difficult to read, but there is a picture and some text about one amp. The model number is AS-110. It looks like it goes into some kind of rack mounting and not in the hole with the instrument. It has three dials for setting the gain (in 6 dB steps from 60 to 120), high cutoff frequency (5, 10, 30, and 100 Hz), and low cutoff (.2, 5 and 10 Hz). The card requires +- 15 VDC and uses 6mA (from what I read). The output is up to +- 10 V. It says PC-card configuration, but that's not PCMCIA in the picture. No price although I did ask for one, which makes me worry a bit. Still plenty of shopping days before the holiday season ;) Buy yourselves something super nice. I am. ;) ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Joe Irvine Subject: Fwd: SOHO IS NEARLY BACK IN BUSINESS Date: Thu, 15 Oct 1998 22:54:41 -0700 >Date: Wed, 14 Oct 1998 17:10:25 -0400 (EDT) >From: NASANews@........... >Subject: SOHO IS NEARLY BACK IN BUSINESS >Sender: owner-press-release@................. >To: undisclosed-recipients:; > >Don Savage >Headquarters, Washington, DC October 14, 1998 >(Phone: 202/358-1727) > >Bill Steigerwald >Goddard Space Flight Center, Greenbelt, MD >(Phone: 301/286-5017) > >Simon Vermeer >European Space Agency Headquarters, Paris, France >(Phone: 33-1-5369-7155) > >RELEASE: 98-190 > > >SOHO IS NEARLY BACK IN BUSINESS > > High-quality new pictures of the Sun, taken earlier this >week from the Solar and Heliospheric Observatory (SOHO), have >raised hopes that the mission may soon be returned to scientific >operations. Engineers have successfully reactivated nine of the >12 instruments on the European Space Agency (ESA)/NASA SOHO >mission, which has been out of commission for nearly four months >after contact was lost on June 24. > > Images from the Michelson Doppler Imager and the Extreme >Ultraviolet Imaging Telescope on SOHO are posted on the Internet >at: http://sohowww.nascom.nasa.gov > > "Scientists on both sides of the Atlantic have waited >anxiously for the recovery of SOHO," commented Roger Bonnet, ESA's >director of science. "Thanks to the extraordinary determination >and skill of ESA and NASA personnel, with industrial contractors >and scientific teams also playing their part, the world has >recovered its chief watchdog on the Sun. SOHO is needed more than >ever, because the Sun is rapidly becoming stormier with a mounting >count of sunspots." > > "It's very exciting to see these images again after so >many weeks of concern. We hope that all the SOHO scientific >instruments can be returned to the same level of health, so we can >resume normal scientific operations in the near future," said Dr. >Joseph Gurman, the U.S. project scientist for SOHO, and co- >investigator on the Extreme Ultraviolet Imaging Telescope (EIT). > > "As of today, nine of the 12 instruments on board SOHO >have been turned on. Four of them are already fully functional; >the other five are still undergoing careful recommissioning >activities. But so far no signs of damage due to thermal stress >during the deep freeze have been detected. I tip my hat to the >engineers who built this spacecraft and these sensitive but robust >instruments," said Dr. Bernhard Fleck, the ESA project scientist >for SOHO. The remaining three instruments will be switched on >over the next few weeks.. > > The images are the latest success for the team during a >complex, challenging recovery sequence. On July 23, SOHO was >located using radar techniques with the 305-meter Arecibo, Puerto >Rico, radio telescope of the U.S. National Astronomy and >Ionosphere Center as a transmitter and a 70-meter dish of the NASA >Deep Space Network as a receiver. SOHO first responded to radio >transmissions on August 3, and telemetry from SOHO was received >August 8, telling controllers the condition of the spacecraft and >its instruments. The spacecraft's frozen hydrazine fuel was >gradually thawed, and on September 16, SOHO's thrusters were fired >to stop its spin and to place it in the correct orientation >towards the Sun. > > Prior to the interruption, instruments on SOHO had taken >about two million images of the Sun, an activity representing over >a terabyte (a trillion bytes) of data. After its launch on Dec. >2, 1995, SOHO revolutionized solar science by its special ability >to observe simultaneously the interior and atmosphere of the Sun, >and particles in the solar wind and the Sun's outer atmosphere. > > SOHO observations have been the subject of more than 200 >papers submitted to refereed, scientific journals. Apart from >discoveries about flows of gas inside the Sun, giant "tornadoes" >of hot, electrically charged gas, and clashing magnetic field- >lines, SOHO also proved its worth as the chief watchdog for the >Sun, giving early warning of eruptions that could affect the >Earth. > > SOHO operates at a special vantage point 1.5 million >kilometers (about one million miles) out in space, on the sunward >side of the Earth. The spacecraft was built in Europe and it >carries both European and American instruments, with international >science teams. SOHO was launched on an Atlas IIAS rocket and is >operated from NASA's Goddard Space Flight Center in Greenbelt, >Maryland. > > In April 1998, SOHO's scientists celebrated two years of >successful operations and the decision of ESA and NASA to extend >the mission to 2003. The extension enables SOHO to observe >intense solar activity, expected when the count of sunspots rises >to a maximum around the year 2000. > > - end - > >The first EIT image taken in the Fe IX/X line at 171 A is >available at: > >http://sohowww.estec.esa.nl/operations/Recovery/eit_171_981013.gif > and > >http://sohowww.nascom.nasa.gov/operations/Recovery/eit_171_981013. >gif > >The MDI image can be found at: > http://soi.stanford.edu > >The latest SOHO EIT images can be found on the Web at: > http://umbra.nascom.nasa.gov/eit/eit_full_res.html > >Details about the operations and about SOHO in general, can be >found at: > http://sohowww.estec.esa.nl > and > http://sohowww.nascom.nasa.gov > >Information on the recovery of SOHO can be found at: >http://sohowww.nascom.nasa.gov/operations/Recovery//operations/Rec >overy/ > > * * * > >NASA press releases and other information are available automatically >by sending an Internet electronic mail message to domo@............ >In the body of the message (not the subject line) users should type >the words "subscribe press-release" (no quotes). The system will >reply with a confirmation via E-mail of each subscription. A second >automatic message will include additional information on the service. >NASA releases also are available via CompuServe using the command >GO NASA. To unsubscribe from this mailing list, address an E-mail >message to domo@............ leave the subject blank, and type only >"unsubscribe press-release" (no quotes) in the body of the message. > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Geophone amps Date: Thu, 15 Oct 1998 23:58:19 -0600 Greg- What is Sprengnether's website URL? -Edward Greg wrote: > ... > I got a response from Sprengnether today. ... -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: Suggestion for seismo base Date: Thu, 15 Oct 1998 23:16:09 -0700 Earlier this year there was a lot of discussion about suitable material for a stable pier for a seismometer mounting. About the same time I bought a granite surface plate but never thought at that time of using one for a pier surface. Granite is very stable and the prices of surface plates has really taken a dive with China now as a supplier. The one I bought was around $90.00. It is 18" x 24" x 3" and weighs 145 lbs. They also have one 12" x 18" x 3" at $30.00 and one 9" x 12" x 3" for $20.00. The surface accuracy is around 0.0001". The company I bought from is Industrial Pipe and Steel in El Monte, Calif. http://ipstool.com I think any machine shop supply company would have them. The American made ones sell for nearly 10 times these prices. Just a thought for those building piers. Al Allworth _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Suggestion for seismo base Date: Fri, 16 Oct 1998 09:02:54 -0700 Al -- Your comments brought back an old memory: Companies that cut granite slabs for surface plates (and other things) sometimes have discards that they cannot use because of inclusions, cracks, etc. I saw one used by an amateur laser experimenter that was about 3' by 6' by 4" thick, weighed about 1000#, and it cost him about $100. The surface wasn't mirror smooth, but as good as a concrete floor. He was trying to isolate his apparatus from earth noise and thus supported the plate with inflated inner tubes. Presumably, setting such a plate in grout could do the opposite. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... At 11:16 PM 10/15/98 -0700, you wrote: > >Earlier this year there was a lot of discussion about suitable material for >a stable pier >for a seismometer mounting. About the same time I bought a granite surface >plate but never thought at that time of using one for a pier surface. >Granite is very stable and the prices of surface plates has really taken a >dive with China now as a supplier. The one I bought was around >$90.00. It is 18" x 24" x 3" and weighs 145 lbs. They also have one 12" x >18" x 3" at $30.00 and one 9" x 12" x 3" for $20.00. The surface accuracy >is around 0.0001". The company I bought from is Industrial Pipe and Steel in >El Monte, Calif. http://ipstool.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Geophone amps Date: Fri, 16 Oct 1998 17:32:08 +0000 Edward Cranswick wrote: > > Greg- > What is Sprengnether's website URL? http://www.sprengnether.com/ I didn't see that amp on their website though. A lot of their "product information" is a request more information form. I hate that. They had time to make the form, but not to type in the product information? As long as I'm looking through the bookmarks: This is the first amateur instrument I ever found. I was very happy to find the PSN site. http://met.univnorthco.edu/resource/seismo.htm ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: VBB Transfer Function References Date: Fri, 16 Oct 1998 18:00:27 -0500 (CDT) Rex, The references you seek are: Steim, J.M., "The Very-Broadband Seismograph"; Doctoral Thesis, Harvard University, Cambridge, Massachusetts, 1986. (161 pages) Steim, J.M., and E. Wielandt, "Report of the Very Broad Band Seismograph", Harvard University, Cambridge, Massachusetts, February, 1985. (unpublished progress report). Wielandt,E and G. Streckeisen, "The Leaf-Spring Seismometer: Design and Performance", Bull. Seism. Soc. Am., 72, 2349-2367, December 1982 Also of interest is: Usher, M.J, Guralp,C, Burch, R.F., "The design of miniature wideband seismometers" Geophys. J.R. Astro. Soc., 55, 605-613; 1978 RE: Amplifier/Demodulator schematic: Also, on another subject, I have been investigating a problem with excessive noise from the VRDT of the VBB seis when I open up the bandwidth, for high frequency response. I have found that the amplifier/demodulator schematic has several errors with respect to the connections of the MC14066 demodulator, causing jitter in the demodulated carrier. I believe I have solved this noise problem, reducing the noise to less than the equilavlent displacement of 1 nanometer, (less than 5 millivolts peak-peak, DC to 100 hz, at the x40 VBB output with a VRDT sensitivity of 5000mv/micron) This noise was not a problem for the tiltmeters, which were heavily filtered at 20 seconds. I will post a revised schematic next week. regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: preamplifier images Date: Fri, 16 Oct 1998 19:25:44 -0500 (CDT) Re: Seismic preamplifier images: I have scanned the actual circuit boards of the micropower seismic preamplifier along with the foil side of the PC board. I also included an image of a perforated board assembly of the same amplifier, and placed them on the ... PSN INFO ... page at: http://www.eas.slu.edu/People/STMorrissey/index.html The jpeg image is 78k. I am surprised that the HP scanner can produce a useful image of a shallow object; the depth of field is about 1 cm. It sure beats trying to photograph it and then scan it. I should try this more often with circuit boards. Any suggestions? regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: preamplifier images; the scanning of Date: Fri, 16 Oct 1998 21:16:50 -0600 S-T Morrissey wrote: > Re: Seismic preamplifier images: > > I have scanned the actual circuit boards of the micropower seismic > preamplifier along with the foil side of the PC board. I also included > an image of a perforated board assembly of the same amplifier, and > placed them on the ... PSN INFO ... page at: > http://www.eas.slu.edu/People/STMorrissey/index.html > The jpeg image is 78k. > > I am surprised that the HP scanner can produce a useful image of > a shallow object; the depth of field is about 1 cm. It sure beats > trying to photograph it and then scan it. I should try this more > often with circuit boards. Any suggestions? > > regards, > Sean-Thomas > Sean, I tried the same routine with my HP Scanjet 6200/6250c and also got the general same results. For bright copper patterns, however, it turned out black, and the color of the circuit board was the same tan color of the actual board. Think you may have used some other model of HP scanner where the copper turns out a same copper color. Another trial of a board with limited parts came out pretty good also. Here the color of the copper leaded circuit leads (gray), did not show up very well, compared to the bright copper of the circuit above. As is, any circuit layout could be displayed reasonably well, and could be a nice guide to wiring. Perhaps if one used white wires on the underside of a commercially available board like the Radio Shack 276-170, $2.99 or similar, it might work out OK, for web site display. That board doesn't have a ground plane though. This board has bright copper leads. Of course there is a world of general purpose add on circuit boards, but the cost can skyrocket over the span. Basically, I'am only suggesting use of a commercial board and white wires for visual contrast, of your preamp, for web display. That way the cost comes way down, but the home adoptee has to do alittle effort to save money. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Vertical barometer fix Date: Sun, 18 Oct 1998 14:03:09 -0400 Hello all, I've been following the seismo activities of my neighbor Bob Barns, and he pointed me here to the PSN list. The vertical instruments have always interested me, though until Sean-Thomas designed his beautifully simple device, I hadn't thought it would be practical to build one. One fundamental difficulty with verticals, is that they record barometric changes along with everything else, "floating" and "sinking" as the air density varies. I had an idea for a possible solution that involves adding a float to compensate the barometric effect. If you add a secondary boom attached to the main boom, going in the opposite direction, across the main hinge, and then you attach a sealed float to that boom at the proper distance from the hinge, the barometric effects on the float should be able to approximately balance the effects on the main system. A plain glass Christmas tree ball, with its opening flame-sealed should make a handsome float. Very rough calculations on the STM-8 indicate that a 3" ball on the end of a 3.5" boom should be about right. The secondary boom system could be quite light; it only needs to be stiff enough to have no mechanical resonances lower than those of the main boom. The secondary boom length would have to be adjustable to permit exact calibration. In fact, calibration may not be so easy unless you have access to a pressure/vacuum chamber. Possibly, careful calculation could get it close enough. If anyone with a vertical is interested (read: foolish enough) to want to try this, I'd be happy to go through the numbers, and would be very interested to hear how well/if it works. Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: barometric floats Date: Sun, 18 Oct 1998 19:39:17 -0500 (CDT) Brett, It seems that good ideas come around again and again, and someday someone will make them work. Regarding your ideas re pressure noise: I have been experimenting with the barometric floatation compensation for some time on the STM-8, with rather mixed results. Some excerpts from previous notes: (last April) Re the seis barometric compensation with sealed pill jars installed on the back side of the hinges: again, an experiment with an indefinite result. It seemed to help, but not notably; I suspect that they were actually flexing (plastic caps) with small changes of pressure. And figuring the correct volume*moment wrt. the boom and the seis mass was an ambiguous endeavor. I have thought of trying a copper toilet tank float if a real lightweight could be found. Or even some very low density but impervious solid. (last July) Re the pill jar (plastic) barometric flotation compensation: as I mentioned, figuring out the volume*distance of all the mass + boom + coils + etc. is nearly impossible. And trial + error methods cannot approximate the complex integration. And I believe that other pressure-induced noise sources play a major role, like the breathing of the coil-magnet assembly with pressure change. I'm only seeing 10 to 20 mv of noise, which amounts to about 12 to 24 nanometers of displacement (with 400 mv/micron and 2x gain in the line driver output). I also think that wherever the "sealed" wooden shelf board box breathes, it makes minute jets of air that blow the mass around. If I observe the high-gain output of the microbarometer, I don't see a consistently repeatable correlation with the noise. So the "counter-flotation" scheme may have some benefit, but is not a solution. (today:) At the suggestion of ?? (I lost the reference), I substituted glass xmas tree balls for the pill jars, and again tried to calculate the compensation effect. A 6 cm ornament has a volume of 113cm^3. I figured the seismometer mass volume (53cm^3) times the distance from the hinge (3.76cm) as a moment*volume of 2019cm^3*cm. I used two ornaments, epoxied together at the necks with a 5mm length of small brass tube; they have to be 8.9 cm from the hinge. THis is about the same volume that you estimated (your 3" ornament is 231.6cm^3?). This seemed to help for long term barometric change, which was evident when I manually logged the pressure and position, as well as temperature, at hourly intervals or so for 5 days. But the short term noise, of the order of 60 to 100 seconds, was little changed. So I believe that "breathing" of the box, the coil-magnet assembly, etc., are blowing the boom around. Once I get the seis into the contaiment (a terrarium) I can lightly pressureize it (by blowing on a tube) to get better info on pressure correction. But the problem with any enclosure or contaiment is that it MUST be absolutely airtight, since the slightest leak will cause an air jet that will blow the mass, the boom, etc., (and the ornaments) around, which usually causes asymetrical bumps when the pressure increases, which is what I see in the data. Today was windy here, and whenever the wind blew the storm doors open (they are not latched, since my dogs use them), the data would take a positive excursion. But air exiting a from a small hole will be less of a jet inside the box. Except that an air pressure drop will blow the coil up out of the magnet gap, ventilate the coils of the VRDT, make the zeroing gearmotor case wheese, and every tapped hole with a screw in it will vent. Not to mention what the enclosure/pier interface is doing to the base of the seismometer (my enclosure floats on foam strips, and the seis feet go through holes in the bottom, closed with foam collars, and rest directly on the pier tiles). Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re:Barometric floats and flat springs Date: Sun, 18 Oct 1998 22:15:21 -0400 Sean-Thomas, Much appreciate your calling my float suggestion "a good idea coming around again" rather than "stale common knowledge". Must have missed it scanning the archives. I'd wondered if that float would make a pretty good sail for the stray breezes. Sounds like it might, indeed. On another subject: I'd been working on an analysis of flat springs such as used in the STM-8 and have had some reasonable results computing the force vs length curves. Larry Cochrane kindly archived two files which document my results to date. This, too, I'm sure has been done before, but am hoping I can perhaps shed a bit more light on the problem. http://psn.quake.net/incoming/spring1.pdf deals with the math for the calculations. http://psn.quake.net/incoming/spring2.pdf contains some spreadsheet calculations and graphs for a spring similar to the STS-8 as well as some calculated vs actual data on a narrower spring as measured by Bob Barns. I'm hoping to combine these results with a future graphical analysis of the "zero-length" geometry in order to be able to somewhat predict the natural characteristics of a given setup. Regards, Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: VBB Transfer Function References Date: Sun, 18 Oct 1998 21:32:57 -0700 At 06:00 PM 10/16/98 -0500, Sean-Thomas wrote: >The references you seek are: > >Wielandt,E and G. Streckeisen, "The Leaf-Spring Seismometer: Design and >Performance", Bull. Seism. Soc. Am., 72, 2349-2367, December 1982 Made the trip to a local university library and found the reference above. Very interesting reading! I looked for: Wielandt, E., and Steim, J. M. A digital very-broad-band seismograph. Annales Geophysicae 4b, 227-232, 1986 but they did not have that publication in that year. Is there anyone out there that has access to it and would be willing to send me a copy? I would, of course, pay for postage, expenses, and trouble. Thanks, Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Warner Subject: Re:Barometric floats and flat springs Date: Mon, 19 Oct 1998 04:55:17 -0700 (PDT) Brett, Nice job on the leaf spring information. Thank You! --Warner Puget Sound Country _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Keith Payea Subject: Vertical barometer fix Date: Mon, 19 Oct 1998 12:56:16 -0400 For those who want to experiment with this idea, I stumbled across more goodies in the "Small Parts Inc" catalog (1-800-220-4242). They have some stainless steel floats in various shapes and sizes. A 3" spherical float costs about $20. It's good up to 500psi, and weighs 2.7 oz. Part number is A-MFX-64. = Not affiliated with them, just a satisfied customer. Cheers, Keith Keith Payea Port Hadlock Design Group phdg@.............. (425) 822-0673 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: VBB Transfer Function References Date: Mon, 19 Oct 1998 09:49:16 -0700 (MST) On Sun, 18 Oct 1998, Karl Cunningham wrote: > At 06:00 PM 10/16/98 -0500, Sean-Thomas wrote: > >The references you seek are: > >Wielandt,E and G. Streckeisen, "The Leaf-Spring Seismometer: Design and > >Performance", Bull. Seism. Soc. Am., 72, 2349-2367, December 1982 > Made the trip to a local university library and found the reference above. > Very interesting reading! > Wielandt, E., and Steim, J. M. > A digital very-broad-band seismograph. > Annales Geophysicae 4b, 227-232, 1986 > but they did not have that publication in that year. Is there anyone out > there that has access to it and would be willing to send me a copy? I > would, of course, pay for postage, expenses, and trouble. Karl, ASU library has this issue according to their catalog. Since I am interested in getting more info myself I'll go make some copies... Let me know where to send it... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re:Barometric floats and flat springs Date: Mon, 19 Oct 1998 10:40:57 -0700 Brett, Great work on the leaf spring analysis! Timely too, since I've been fiddling with a .031" floor scraper blade lately. I'll crank up my spreadsheet and play with some numbers. Thanks for analysis, and for posting it. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Doug Crice Subject: Re: Vertical barometer fix Date: Mon, 19 Oct 1998 11:45:39 -0700 I just noticed that aluminum coke cans weigh almost nothing once you take the coke out. You could punch a pinhole, drain the coke, then put a little glue over the hole. Use diet coke so there's no sugar residue. -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Roger Vaught" Subject: Re: Vertical barometer fix Date: Mon, 19 Oct 1998 18:45:47 -0500 I just joined the list this afternoon. Is there an archive of messages? FAQ's? The Vertical barometer topic sounds interesting. Unfortunately, I'm in the dark as to what it is all about. Thanks, Roger - Houston -----Original Message----- From: Keith Payea To: PSN-L Mailing List Date: Monday, October 19, 1998 12:01 PM Subject: Vertical barometer fix >For those who want to experiment with this idea, I stumbled across more >goodies in the "Small Parts Inc" catalog (1-800-220-4242). SNIP _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Vertical barometer fix Date: Mon, 19 Oct 1998 20:34:36 -0400 Roger, I was using the term to describe a vertical seismometer that's responding more to barometric pressure changes than to ground motion. I had re-invented an idea to compensate the effect with small "float". It had been previously covered earlier this year. Try http://psn.quake.net/maillist.html#archives Brett Nordgren >The Vertical barometer topic sounds interesting. Unfortunately, I'm in the >dark as to what it is all about. > >Thanks, >Roger - Houston _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: VBB Transfer Function References Date: Mon, 19 Oct 1998 18:02:47 -0700 John I am interested also. Is it possible to scan it? Barry John Hernlund wrote: > On Sun, 18 Oct 1998, Karl Cunningham wrote: > > At 06:00 PM 10/16/98 -0500, Sean-Thomas wrote: > > >The references you seek are: > > >Wielandt,E and G. Streckeisen, "The Leaf-Spring Seismometer: Design and > > >Performance", Bull. Seism. Soc. Am., 72, 2349-2367, December 1982 > > Made the trip to a local university library and found the reference above. > > Very interesting reading! > > Wielandt, E., and Steim, J. M. > > A digital very-broad-band seismograph. > > Annales Geophysicae 4b, 227-232, 1986 > > but they did not have that publication in that year. Is there anyone out > > there that has access to it and would be willing to send me a copy? I > > would, of course, pay for postage, expenses, and trouble. > > Karl, > ASU library has this issue according to their catalog. Since I am > interested in getting more info myself I'll go make some copies... > > Let me know where to send it... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Barometric floats and flat springs Date: Mon, 19 Oct 1998 18:13:03 -0700 Brett I have been working with two of Sean Thomas' VBB style units for a couple of months now. It seems that the biggest variation I have found ( as Sean Thomas has mentioned in the past ) is temperature. I think that the temperature affects the stiffness of the spring by changing the length or modulus. I have yet to find data that support the fact that metal(steel) under stress may have a modulus which varies slightly with temperature. I did a rough calc and the length change appears to me second order. Regards Barry Brett Nordgren wrote: > Sean-Thomas, > > Much appreciate your calling my float suggestion "a good idea coming around > again" rather than "stale common knowledge". Must have missed it scanning > the archives. > > I'd wondered if that float would make a pretty good sail for the stray > breezes. Sounds like it might, indeed. > > On another subject: > > I'd been working on an analysis of flat springs such as used in the STM-8 > and have had some reasonable results computing the force vs length curves. > Larry Cochrane kindly archived two files which document my results to date. > This, too, I'm sure has been done before, but am hoping I can perhaps shed > a bit more light on the problem. > > http://psn.quake.net/incoming/spring1.pdf deals with the math for the > calculations. > > http://psn.quake.net/incoming/spring2.pdf contains some spreadsheet > calculations and graphs for a spring similar to the STS-8 as well as some > calculated vs actual data on a narrower spring as measured by Bob Barns. > > I'm hoping to combine these results with a future graphical analysis of the > "zero-length" geometry in order to be able to somewhat predict the natural > characteristics of a given setup. > > Regards, > Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: Re: VBB Transfer Function References Date: Mon, 19 Oct 1998 18:06:41 +0000 John, Count me in there also, as a 'me-to'. Thank you. Walt Williams, 98.10.19 dfheli@.............. ------- Forwarded Message Follows ------- Date: Mon, 19 Oct 1998 18:02:47 -0700 From: barry lotz To: PSN-L Mailing List Subject: Re: VBB Transfer Function References Reply-to: PSN-L Mailing List John I am interested also. Is it possible to scan it? Barry John Hernlund wrote: > On Sun, 18 Oct 1998, Karl Cunningham wrote: > > At 06:00 PM 10/16/98 -0500, Sean-Thomas wrote: > > >The references you seek are: > > >Wielandt,E and G. Streckeisen, "The Leaf-Spring Seismometer: Design and > > >Performance", Bull. Seism. Soc. Am., 72, 2349-2367, December 1982 > > Made the trip to a local university library and found the reference above. > > Very interesting reading! > > Wielandt, E., and Steim, J. M. > > A digital very-broad-band seismograph. > > Annales Geophysicae 4b, 227-232, 1986 > > but they did not have that publication in that year. Is there anyone out > > there that has access to it and would be willing to send me a copy? I > > would, of course, pay for postage, expenses, and trouble. > > Karl, > ASU library has this issue according to their catalog. Since I am > interested in getting more info myself I'll go make some copies... > > Let me know where to send it... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Leaf spring analysis Date: Mon, 19 Oct 1998 21:18:58 -0400 Recently, I included this in a reply to Sean-Thomas. Have some new information to add, so will start it a thread of its own. I'd been working on an analysis of flat springs such as used in the STM-8, and have had some reasonable results computing the force vs length curves. Larry Cochrane kindly archived three files which document my results to date. This, I'm sure has been done before, but am hoping I can perhaps shed a bit more light on the problem. Although deriving the equations is a seriously hard problem, (and is mostly not included here) the results are just a matter of some easy algebra and an elliptic integral table. This is only done for springs attached by hinges at the ends. If I ever get feeling sufficiently masochistic, I might try the clamped-end analysis. ftp://psn.quake.net/incoming/spring1.pdf deals with the math for the calculations. ftp://psn.quake.net/incoming/spring2.pdf contains some spreadsheet calculations and graphs for a spring similar to the STS-8 as well as some calculated vs actual data on a narrower spring as measured by Bob Barns. ftp://psn.quake.net/incoming/Elliptic.txt is a tab-delimited text file of the first four columns of my spreadsheet data. They represent a table of elliptic integrals to import if you want to try a similar analysis on your own spreadsheet. Saves a couple of hours of typing. I'm hoping to combine these results with a future graphical analysis of the "zero-length" geometry in order to be able to somewhat predict the natural characteristics of a given setup. Note: The .pdf files can be viewed with the Adobe Acrobat Reader. If you don't already have it, it's available for most platforms by free download from: http://www.adobe.com/prodindex/acrobat/readstep.html Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: vbb.loop.analysis & spring Date: Mon, 19 Oct 1998 20:45:18 -0500 (CDT) Brett, The feedback world is full of notable disasters when the loop parameters hit the wall; most notable recently was the new Ariane rocket that blew up when someone programmed the loop limits on g for the smaller previous rockets. When the VBB seis has such problems, it goes momentarily ballistic, or at least wonderfully non-linear, like when a 20-ton gravel truck rumbles down the street 10 meters from the seis. This actually clips the signals at the voltage limits of the electronics, and I get a one-sided long period response at the effective period. if nothing clips, the signal is OK, which proves the hugh dynamic range of the VBB system. (Which is why filters are a no-no for it) I think that your effort to delve into the details of the feedback system will be interesting for everyone. A number of members have been looking into variations on the theme, and I am hoping that you can clarify theoretically some of the things I know only experimentally. I am rather unfamiliar with the fine nuances and mathematical realites of feedback systems, so I won't be much help. My background is physics and electronics, with all the calc and diffeq that goes with it, but I was always weak on the engineering math. But I have done some dissecting of the VBB seismometer response with MATHCAD by iterating on any and all of the parameters to see how they affect the response. Like when the first broadbands came out, all the instrument companies tried it on their current hardware, but it didn't work. I found out why: if the feedback coil resistance is at all significant (in context), the loop is unstable. I have a cabinet full of nice compact seismometers that can't be used with feedback because their coils are in the 1K ohm and up range. I assume that you have my mathcad version of the transfer function. (http://www.eas.slu.edu/People/STMorrissey/etc_export has an rtf version) You can iterate on any of the terms to fine tune them, or just put in a 100kg mass and "sink" the response. If you need the iterated versions (on r,Rp,Cp,Rf,TI,RI, etc) let me know. All they do is plot a suite of responses with, for example, Cp set from 1 to 10 uf by 1uf steps. An early article on the ideas of using feedback to make a force-balance system is "The Sensitivity and Dynamic Range of Inertial Seismographs", by Ben S, Melton; Rev. of Geophysics, vol 14, no 1, Feb. 1976. It does point out why a single force feedback loop is not successful: DC drift (thermal, tilt, etc.,) saturate the output well above the microseism or earth tidal signals of 1 micron/sec^2 that we are looking for. At that time, before good op-amps, his general conclusion was that galvanometric photo-tube amplifiers were the best way to go. But I have found that the VBB feedback is highly interactive, in the sense that one parameter or component value shows up in many terms of the response, making for interesting trade offs. And if the response of the transfer function shows an instability, the VBB seis will show it, like if Rp is infinite, the damping goes low, and the boom will actually oscillate at the effective period. And conversely, since I found no information or input about the mechanical characteristics of the spring in the transfer function, other than the mechanical period it controls, I was confident that almost any well behaved leaf spring would work if a "near" zero length (where the restoring force is nearly constant) behavior could be found without involving the rigidity if the spring, which is why I came up with the fully flexured mounting of it. By the way, the Wielandt and Streckeisen BSSA paper mentions making part of the STS-1 spring from "elinvar", as a material with a positive temperature coefficient (TC), to offset the negative TC of the rest of the spring. I'm not sure if anyone makes drywall taping knives from elinvar, though. The STS-1 still has a significant temperature problem. The bi-metallic garden thermostat coil I'm using on the STM-8 is a major improvement; I just bought some more to install in parallel, since I still haven't actually over corrected the leaf spring. Its on the list; I'm currently exploring all the nuances of the intrinsic noise of the VRDT, which is about 0.2 nanometers at 1 hz p-p. PS: If anyone didn't see the note, the schematic I posted for the demodulator has errors; I will try to get a revision up this week. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: VBB Transfer Function References Date: Mon, 19 Oct 1998 19:16:38 -0700 (MST) On Mon, 19 Oct 1998, Walt Williams wrote: > Count me in there also, as a 'me-to'. > Walt Williams, 98.10.19 > > I am interested also. Is it possible to scan it? > John Hernlund wrote: > > Karl, > > ASU library has this issue according to their catalog. Since I am > > interested in getting more info myself I'll go make some copies... > > Let me know where to send it... Alright. Sounds like a plan! Is everyone able to access it if I scan and upload it as .jpeg files on the web??? (They will have to be some what large to be legible...) Karl? Walt? Everybody else? ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Barometric floats and flat springs Date: Mon, 19 Oct 1998 22:10:58 -0400 Barry, Yes, I agree that the elastic modulus of the spring probably does change with temperature. You could infer that by noting that expensive mechanical watches have balance wheel hairsprings made from a material called Elinvar, described as an alloy which has an elastic modulus that doesn't vary with temperature. I think I remember reading that the Streckeisen STS-1 vertical (and possibly others) uses a leaf spring made of Elinvar. Does anyone know who makes Elinvar or anything about its mechanical properties? It would be interesting to find out how much a small sheet would cost. Could be that, if there's enough interest, one could get together an order large enough for the manufacturer's minimums. Regards, Brett > I think that the temperature >affects the stiffness of the spring by changing the length or modulus. I have >yet to find data that support the fact that metal(steel) under stress may have >a modulus which varies slightly with temperature. I did a rough calc and the >length change appears to me second order. > >Regards > >Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Barometric floats and flat springs Date: Mon, 19 Oct 1998 19:58:51 -0700 Brett I am aware of invar(I think that's how it's spelled). We use a 0.75"x11" cylinder of it at work for a reference length in measuring the movement of concrete. I'll check McMaster Carr. Regards Barry Brett Nordgren wrote: > Barry, > > Yes, I agree that the elastic modulus of the spring probably does change > with temperature. You could infer that by noting that expensive mechanical > watches have balance wheel hairsprings made from a material called Elinvar, > described as an alloy which has an elastic modulus that doesn't vary with > temperature. > > I think I remember reading that the Streckeisen STS-1 vertical (and > possibly others) uses a leaf spring made of Elinvar. > > Does anyone know who makes Elinvar or anything about its mechanical > properties? > > It would be interesting to find out how much a small sheet would cost. > Could be that, if there's enough interest, one could get together an order > large enough for the manufacturer's minimums. > > Regards, > > Brett _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: RE: Barometric floats and flat springs Date: Mon, 19 Oct 1998 21:00:15 -0700 > -----Original Message----- > From: barry lotz [mailto:gbl@........ > Sent: Monday, October 19, 1998 6:13 PM > To: PSN-L Mailing List > Subject: Re: Barometric floats and flat springs > > > Brett > I have been working with two of Sean Thomas' VBB style units > for a couple > of months now. It seems that the biggest variation I have found ( as Sean > Thomas has mentioned in the past ) is temperature. I think that > the temperature > affects the stiffness of the spring by changing the length or > modulus. I have > yet to find data that support the fact that metal(steel) under > stress may have > a modulus which varies slightly with temperature. I did a rough > calc and the > length change appears to me second order. > > Regards > > Barry Barry and all, I mentioned the idea of plating copper on one side of the spring to temperature compensate it. Has anyone given further thought to this? Copper is easy to plate and could be done at home. The problem of how much copper to plate should not be too difficult to resolve. Al Allworth _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Barometric floats and flat springs Date: Mon, 19 Oct 1998 21:20:04 -0700 Al I have had pretty good results with a thermometer bymetal coil with the coil center fixed to the base and the free end resting under or over the sensor beam. The trick is how far to put it from the hinge so as to not over compensate. Sean Thomas has discussed this prior. It works pretty well. I haven't tried other options as yet. Regards Barry Al Allworth wrote: > Barry and all, > > I mentioned the idea of plating copper on one side of the spring > to temperature compensate it. Has anyone given further thought to > this? Copper is easy to plate and could be done at home. The problem > of how much copper to plate should not be too difficult to resolve. > > Al Allworth > > ___________________________________________ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Barometric floats and flat springs Date: Tue, 20 Oct 1998 04:48:23 +0000 Brett Nordgren wrote: > Does anyone know who makes Elinvar or anything about its mechanical > properties? I searched around the internet for you a bit. I found the following: http://www.elinvar.com/ is a company named after the metal, but having nothing really to do with it. They are a temp agency. http://asuwlink.uwyo.edu/~metal/invar.html is a description of invar that mentions Elinvar. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: RE: Geophone amps Date: Mon, 19 Oct 1998 22:11:55 -0700 S-T Morrissey I don't know if you mentioned it before but I have a question: When you remove the flat spring from your seis does it completely straighten or is it deformed by the bending? I tried the metal of a cheap looking taping knife and it appeared to stay somewhat bent. I didn't buy it because of that. They also had some similar things called paint guards or something like that. They were blued steel but also seemed too soft for a spring. Al Allworth _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brian Chesire Subject: Re: Barometric floats and flat springs--Elinvar Date: Tue, 20 Oct 1998 07:49:57 -0700 I think what he's refering to is "ELGILOY" a trademark of "Eligiloy Limited Partenership", It was an outgrowth of the Elgin or Hamilton watch company. As I understand it, Elgiloy was developed as zero temperature coefficient spring material for pre-digital chronometers and watches. I don't know if they have a web site but they are located in Elgin, IL. Brian WA5PPO Tucson, AZ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: PSN TRADING POST; pre-web site/page start up Date: Tue, 20 Oct 1998 11:24:46 -0600 Hi All, Have volunteered to do the web page maintenance of the PSN Trading Post on Larry Cochranes generiously hosted Redwood City PSN site: http://psn.quake.net/ The page is ready to go, but FIRST, we need some "advertisements" to fill the block spaces, and then the html file can be placed on his system. So....if you have some items that maybe of interest to others, please submit them as soon as possible to myself, via e-mail to: psnseismograph52@.......... Or regular mail: Meredith Lamb 715 S. Pecos St. Denver, Colorado USA 80223 The following text is the present makeup and guidelines of the page yet to appear: ******************************************************************** PSN Trading Post Last update: --/--/98 The followings is a list of items PSN'ers or creditable outside partys have submitted for Sale/Trade or they want. Any additions, mistakes corrections, subtractions, conflicts between partys, and international shipping and monetary exchange problems of items hereon are SOLELY the responsiblity of the individual submission/answering partys involved. I ask that any one individual submit no more than 2 items at a time per block available. Any inactive item over 1 month of posting age will be deleted unless judged to be of substantial PSN interest. Please make the items words as short and concise as possible and include your email address or complete address if necessary. Please...only submit Sale/Trade items with a real or potential seismological use or as an accessory/assistance item, i.e.; computers, PC-cards, earth science books etc: hmmm..you might have to even explain its relationship-ha. Be aware that alot of answering individuals may be starting their own stations and have little or no equipment to trade. Above all....have fun checking the list! ............................................................................................................................... .. Example: 11/1/98... For trade: 1 used home brew.......seismometer, up to 15s period, oil damping. Size 2' X 3' X 1.5' high normally, condensed on shipment. Weighs 70lbs. Send email to........., see the critters photo at my web site, http://www................internet address, or, (address). Want........in exchange or, contact me with what you offer, and we'll go from there. ............................................................................................................................... ...... Please send you final corrected draft of the PSN Trading Post E-Mail item too: Meredith Lamb, at: psnseismograph52@.......... OR 715 S. Pecos St. Denver, Colorado USA 80223 ............................................................................................................................... ...... Submitting individuals items follow this heading and text and are set in block spaces. **************************************************************************** Hopefully over time, the items listed can assist all individuals interested in either starting up their stations, or adding on to their improvement. Who knows....maybe some of the professional stations, nets, government sources, may even sometime list their unused equipment, and it could find its way into amateur hands.....wouldn't that be something!!! If you're an "old timer" with unused equipment, and can list some items, it can go along ways toward helping start others with strong interests, but who face a lack of equipment sources, at (hopefully) a reasonable price/trade range. The appearance of the web page on the site now depends on submissions to the page. So......go ahead and put me to work......I'll try to put them on the page asap. Who knows it maybe just days till then??? Uhhhh.....what do you have or want???, send to me, and NOT, to the PSN mailing list please. Any suggestions or improvements to the makeup of the page will be seriously considered of course; changes to this or anything are realistically inevitable, as with everything. If your have more than 2 items; and they would realistically be considered of intense interest by, say a beginner; due consideration will be extended to expanding the block on the web page of course. Thanks, Meredith Lamb Hi All,

Have volunteered to do the web page maintenance of the PSN Trading Post on
Larry Cochranes generiously hosted Redwood City PSN site:  http://psn.quake.net/
The page is ready to go, but FIRST, we need some "advertisements" to fill the block
spaces, and then the html file can be placed on his system.  So....if you have some
items that maybe of interest to others, please submit them as soon as possible to
myself, via e-mail to:       psnseismograph52@..........     Or regular mail:
Meredith Lamb    715 S. Pecos St.   Denver, Colorado  USA   80223

The following text is the present makeup and guidelines of the page yet to appear:
********************************************************************
PSN Trading Post
Last update:  --/--/98
The followings is a list of items PSN'ers or creditable outside partys have submitted
for Sale/Trade or they want.
Any additions, mistakes corrections, subtractions, conflicts between partys, and
international shipping and monetary exchange problems of items hereon are
SOLELY
the responsiblity of the individual submission/answering partys involved.  I ask that
any one individual submit no more than 2 items at a time per block available.  Any
inactive item over 1 month of posting age will be deleted unless judged to be of
substantial PSN interest.  Please make the items words as short and concise as
possible and include your email address or complete address if necessary.
Please...only submit Sale/Trade items with a real or potential seismological use or as
an accessory/assistance item, i.e.; computers, PC-cards, earth science books etc:
hmmm..you might have to even explain its relationship-ha.  Be aware that alot of
answering individuals may be starting their own stations and have little or no
equipment to trade.  Above all....have fun checking the list!
........................................................................................................................... .....
Example: 11/1/98... For trade: 1 used home brew.......seismometer, up to 15s
period, oil damping.  Size 2' X 3' X 1.5' high normally, condensed on shipment.
Weighs 70lbs.  Send email to........., see the critters photo at my web site,
http://www................internet address, or, (address).  Want........in exchange or,
contact me with what you offer, and we'll go from there.
........................................................................................................................... .........
Please send you final corrected draft of the PSN Trading Post E-Mail item too:
Meredith Lamb, at: psnseismograph52@..........   OR   715 S. Pecos St.
Denver, Colorado USA  80223
........................................................................................................................... .........
Submitting individuals items follow this heading and text and are set in block spaces.
****************************************************************************

Hopefully over time, the items listed can assist all individuals interested in either starting up
their stations, or adding on to their improvement.  Who knows....maybe some of the
professional stations, nets, government sources, may even sometime list their unused
equipment, and it could find its way into amateur hands.....wouldn't that be something!!!

If you're an "old timer" with unused equipment, and can list some items, it can go along
ways toward helping start others with strong interests, but who face a lack of equipment
sources, at (hopefully) a reasonable price/trade range.

The appearance of the web page on the site now depends on submissions to the page.  So......go ahead and put me to work......I'll try to put them on the page asap.  Who knows it maybe just days till then???   Uhhhh.....what do you have or want???, send to me, and NOT, to the PSN mailing list please.  Any suggestions or improvements to the makeup of the page will be seriously considered of course; changes to this or anything are realistically inevitable, as with everything.

If your have more than 2 items; and they would realistically be considered of intense interest by, say a beginner; due consideration will be extended to expanding the block on
the web page of course.

Thanks,

Meredith Lamb
  From: GeE777@....... Subject: Seismic Event TEST TEST Date: Tue, 20 Oct 1998 15:16:15 EDT THE FOLLOWING IS A TEST I AM ABLE TO SEND A GRAPH OF MY RECORDED SEISMIC EVENTS OVER AOL I DON"T KNOW IF IT WORKS OUT OF AOL THIS IS A TEST TO SEE IF IT MAKES SENSE ON THE NET Recorded a seismic event at this station. Approximate Time XX XX XX Estimated strength- YYYY Estimated distance from this station- ZZZZZ Station coordinance 33 Deg. 53.87 min North 118 Deg. 04.50 min. West George Erich Seismic Exploration Consultant P. O. Box 2011 Norwalk, CA 90650 U. S. A. e-mail GeE777@....... END OF TEST _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Barometric floats and flat springs--Elinvar Date: Tue, 20 Oct 1998 13:34:16 -0700 Thought you all might be interested in the following: There are several alloys that exhibit near zero temperature coefficient of modulus of elasticity, at least over the range near room temperature. According to the Machinery Handbook, 22rd edition, they are: Elinvar (Trade name of Society Anon. de Commentry Fourchambault et Decazeville, Paris, France) -- The first constant-modulus alloy used for hairsprings in watches. Variations are known by Elinvar Extra, Durinval, Modulvar, and Nivarox. Ni-Span C (Trade name of International Nickel) -- Very popular constant-modulus alloy. Useful up to 60K - 80K psi stress. Iso-Elastic (Trade name of John Chatillon & Sons) -- Useful to 40K to 60K psi. Used in dynamometers, instruments, and food-weighing scales. Elgiloy (Trade name of Elgin National Watch Co) -- Also known as 8J Alloy, Durapower, and Cobenium. NON-MAGNETIC alloy useful up to 75K psi stress. Used in watches and instrument springs. Dynavar (Trade name of Hamilton Watch Co) -- Also NON-MAGNETIC. Similar characteristics and uses as Elgiloy. I'd be very interested in going in with others to purchase some metal. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Magnets source.... Date: Tue, 20 Oct 1998 17:28:07 -0600 Received the latest Herbach and Rademan surplus catalog today. Pages 78 & 79, show a variety of magnets. http://www.herbach.com You can order a catalog via the internet on their bottom home page. If you're into S-G type seismo construction, via the original construction, I see Alnico bar magnets of 3 sizes/diameters/lengths. They also have a variety of much stronger gauss fields bar neodymium magnets of various diameters, but not long lengths. Don't see any 4 pole variety neodymium magnets here, but they do have the 2 pole variety, which could work for some projects. Catalog comes wide spectrum....mechanical, power supplies, other electronics etc...115 pages. -- Meredith Lamb <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html and secondary site: http://www.geocities.com/ResearchTriangle/Facility/1739/index.html <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Two web sites with "zero" temp coeff metals Date: Tue, 20 Oct 1998 18:21:27 -0600 http://www.thomasregister.com/olc/eaglealloys/alloys.htm Eagle Alloys Corp. lists Elgiloy, various invar compositions, nickel 902 (Ni-Span-C). Site does little more than list the items it can sell. Why are commercial sites so empty??-ha Another web site: http://www.springs.co.uk/product.htm Doig Spring & Engineering co. ltd. They make coil & leaf springs. They list elgiloy and Ni-Span-C. Meredith Lamb <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html and secondary site: http://www.geocities.com/ResearchTriangle/Facility/1739/index.html <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: large NZ quake today Date: Wed, 21 Oct 1998 12:33:56 +1200 U.T.: 1998 October 20 2002 NZST: 1998 October 21 9.02 a.m. Lat, Long: 43.49S 169.08E Location: 44 km north of Haast Focal depth: 12 km Magnitude: 6.1 Felt widely in the lower South Island with some damage reported. Dave this event overloaded all my sensors, one day i will get a strong motion seismometer Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Barometric floats and flat springs--Elinvar Date: Tue, 20 Oct 1998 20:31:43 -0400 Karl, Thanks for that most excellent report on Elinvar, etc. But there's good news and bad news. The good news is obviously that there exist spring materials which have a stable elastic modulus. The bad news is that those materials are only good for, say, 75,000 psi stress (vs 180,000 or so for spring steel). The computer says that if you reduce the spring thickness to .011" you can get down to 75,113 psi in the assumed STM-5 configuration. However that makes the force go down to 1.13 pounds. To get it back to the originally assumed 4.95 pounds, you have to increase the spring width from 3.5" to 15". Ouch! Makes great watch hairsprings, though. Brett _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Oscillator Circuit Update Date: Tue, 20 Oct 1998 20:48:20 -0400 Sean I have just completed the assembly and tested of the oscillator portion of the VRDT circuit you have posted on your web page. I seems to work (will have to wire into the VRDT coils to see what sine wave looks like under load). I however did find several circuit errors. The first, the two 1N914 diodes on either side of the 10K pot in the voltage reference section. They are shown backwards. The other error is in the area of the 4018 counter. First, the lead connecting the 100K resistor to pin 1 of 4018 should be disconnected. The wire from the 100K resistor should be connected to common. The wire that connects the 100K/309K/221K/309K resistors and .001mF capacitor to pin 11 of 4018 should be removed from pin 11. The rest of the circuit remains unchanged. Finally, install a jumper between pin 1 and 11. A complete discussion of sine wave generation can be found in "CMOS COOKBOOK" by Don Lancaster (Howard Sam, Indianapolis) 1977, page 325-330. The exact circuit used is shown except all resistors are smaller by exactly a factor of 10. Maybe this resistance increase is to reduce the current demand? I will try to update the schematic I have on my web page this weekend and post. Rex Klopfenstein, Jr. Bowling Green, OH rklofen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: leaf spring material Date: Tue, 20 Oct 1998 20:02:33 -0500 (CDT) Al, Karl, and company. Al asked if the spring material I have used exhibited any residual deformation. In general it does not, even if it is bent into a closed arc. In some of my earlier designs, I was able to form an angle across the end with the vise. But I have noticed that some of the hardware store scrapers are not really blued spring steel, but softer material or even stainless. Karl has done some fine research on elinvar and other constant- modulus with temperature materials. I noticed the Chantillion and Sons company: they have long been a supplier for iso-elastic coiled "zero-length" springs for commercial seismometers. I'm not sure that such materials are available in sheet form for use as a leaf spring. I guess we will have to see if Bretts' analysis would show that a constant modulus will help. I have long thought, perhaps in error, that the problem with the fully curved leaf spring is that the outer surface is in fact stretched more than the inside surface, so is in effect longer on the outside, which would expand more with temperature. This would give it the negative temperature behavior that we see: the spring lowers the boom as the temperature increases. From what I have seen of other leaf spring applications, the curvature is minimized, but one end is clamped. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: leaf spring material Date: Tue, 20 Oct 1998 18:40:54 -0700 Sean Thomas That is what I originally thought also. I checked it by figuring the length of the inside and outside circumference and the length change of each for a reasonable temp change. I then figured the new diameter based on the new lengths and got very little change, though it was in the correct direction Regards Barry S-T Morrissey wrote: > Snip---. > I guess we will have to see if Bretts' analysis would show that a > constant modulus will help. I have long thought, perhaps in error, that > the problem with the fully curved leaf spring is that the outer surface > is in fact stretched more than the inside surface, so is in effect longer > on the outside, which would expand more with temperature. This would give it > the negative temperature behavior that we see: the spring lowers the > boom as the temperature increases. From what I have seen of other leaf > spring applications, the curvature is minimized, but one end is clamped. > > Regards, > Sean-Thomas > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: New Event? Date: Tue, 20 Oct 1998 19:29:48 -0700 Hi All Is anyone picking a teleseismic event now? (about 1:30 UTC). Regards Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: George Harris Subject: Re: Barometric floats and flat springs Date: Mon, 19 Oct 1998 23:27:24 +0000 Al Allworth wrote: > > I mentioned the idea of plating copper on one side of the spring > to temperature compensate it. Has anyone given further thought to > this? Copper is easy to plate and could be done at home. The problem > of how much copper to plate should not be too difficult to resolve. > > Al Allworth > Al, The problem with plated copper would be that it is very soft. Since it would be on the surface and thus highly stressed, it would cause a hysteresis effect, I suspect. George Harris _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: david alexander Subject: Re: New Event? Date: Tue, 20 Oct 1998 21:09:34 -0700 don't have any instruments yet but i do think that i felt it north of seattle. thought that the dryer was running but when i looked nothing was running but the house was shaking a little. will be interesting to see where it was. dave alexander k7da barry lotz wrote: > > Hi All > Is anyone picking a teleseismic event now? (about 1:30 UTC). > Regards > Barry > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "J. D. Cooley" Subject: Re: New Event? Date: Wed, 21 Oct 1998 06:07:20 -0700 At 07:29 PM 10/20/98 -0700, you wrote: >Hi All > Is anyone picking a teleseismic event now? (about 1:30 UTC). > Regards > Barry > > > I don't know where you live, Barry, but probably this is the one: == PRELIMINARY EARTHQUAKE REPORT == Rapid Earthquake Location Service U.S. Geological Survey, Menlo Park, California U.C. Berkeley Seismological Laboratory, Berkeley, California Version 2: Updates lower and earlier versions of this earthquake report This event has been reviewed by David Oppenheimer-USGS A LIGHT EARTHQUAKE OCCURRED AT 01:31 AM PDT Wednesday, Oct 21, 1998. THE MAGNITUDE 4.5 (ML) EVENT IS LOCATED 13 MILES WSW OF PORTOLA, CA THE HYPOCENTRAL DEPTH IS 12.6 MILES. Earthquake location is poorly constrained because it occurs near edge of seismic network. PRINCIPAL EARTHQUAKE PARAMETERS _______________________________ Magnitude : 4.49 ML Event Date & Time : 10/21/1998 01:31:01 AM PDT 10/21/1998 08:31:01 UTC Location : 39.7247 N, 120.6768 W : (39 deg. 43.48 min. N, 120 deg. 40.61 min. W) Depth : 20.2 km. deep ( 12.6 miles) Location Quality : Fair 20 km ( 13 miles) WSW (242 degrees) of Portola, CA 33 km ( 20 miles) SE (136 degrees) of Quincy, CA 38 km ( 23 miles) W (278 degrees) of Loyalton, CA 52 km ( 32 miles) SSE (153 degrees) of Greenville, CA 59 km ( 37 miles) NNE ( 29 degrees) of Nevada City, CA 65 km ( 41 miles) NNE ( 30 degrees) of Grass Valley, CA ADDITIONAL EARTHQUAKE PARAMETERS ________________________________ number of phases : 213 rms misfit : 0.07 seconds horizontal location error : 0.9 km vertical location error : 2.6 km maximum azimuthal gap : 219 degrees distance to nearest station : 58. km In region 2 (062) WALKER LANE event ID: 40081380 "JD" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Barometric floats and flat springs Date: Wed, 21 Oct 1998 09:22:18 -0400 Sean-Thomas, I think I've satisfied myself that the major temperature effect on the spring performance is change of elastic modulus and not thermally-induced stresses, by the following arguments. In his "Theory of Elasticity" book, in analyzing the stress effects of *non uniform* temperatures, Timoshenko states that for analysis, thermal effects can be treated separately from "spring" effects and then combined at the end. Following that approach, a *uniform* temperature change could be analyzed by imagining that we could start out with a second spring that's been permanently bent so that it can be removed from the seismograph, and still retain the exact shape of the installed spring with no force applied. When heated *uniformly* it expands in all dimensions, just as if you had changed the scale factor in the drafting program. If you warmed it by 10 degrees C, all its dimensions would increase by slightly more than 0.01%, *including the opening*. In effect, "length" will tend to increase with temperature, thus increasing the force once it's been pushed back to its original length and summed with the installed spring. Opposite what you're seeing, I think. In Shanley, "Strength of Materials" he describes five characteristics of the Modulus of Elasticity. Number 4 is: "The modulus of elasticity decreases with increasing temperature - This can be explained by atomic theory, but for engineering purposes the value of E is best determined experimentally at the desired temperature". Shanley also states that there are no spring forces (stresses) which result directly from uniform thermal expansion (thermal strain). There are only those which arise when you try to constrain the expansion in some way. The difficulty that's arising in using alloys designed for stable elastic modulus, is that they aren't as strong as spring steel, by a factor of two or three. A 0.018" x 12 " sheet, bent past 180 degrees would either break or permanently bend. So the problem is more than just replacing the steel blade with an identical one made from a new material. Found an excellent Web site with properties for all kinds of materials, not just metals. http://www.matls.com/ (That's "L" as in MATLS) For NI-SPAN-C / Alloy 902, one of the alloys that's been discussed, the direct URL is: http://www.matls.com/SpecificMaterial.asp?bassnum=NINC83&group=General Well, back to the drawing board. Brett _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: robert barns <75612.2635@..............> Subject: Re: Barometric floats and flat springs Date: Wed, 21 Oct 1998 10:07:40 -0400 Brett, I tried excite, altavista and infoseek to get data about Elinvar and found nothing interesting except a possible clue to sources. Maybe the Hamilton Watch Co. or the Waltham Watch Co. As you indicated, watch makers are intensely interested in the elastic modulus as a function of temperature. The following quote is from "The Science of Clocks & Watches" by AL Rawlings, 3rd., ed., 1993. (Fascinati= ng reading for those interested in mechanical devices.) "If l is the length of a spring, t its thickness, b its breadth (the section being supposed rectangular) and E its modulus of elasticity, then= Q =3D C * t^3*b*E/l where C is some constant depending on the units chosen. "A rise in temperature in the case of steel, will have the effect of increasing all three dimentions of the spring by the same proportion. Th= e changes in b and l will cancel out, but the increase in t^3 will make the= spring stiffer. The expansion of steel is given in the tabel on p 46 [gives 11ppm/deg C]. If we take three times this expansion, we shall get= approx. the corresponding change in the value of t^3 and therefore of Q, namely 33 ppm increase due to the change in dimensions of the spring caus= ed by the temp, rise of 1 deg C, provided that E remains constant. This mak= es the vibration quicker with increased temperature. "But E for steel also varies with temp., for the material becomes more yielding as it gets warmer. It has been found that at normal temps. E decreases about 240 ppm/deg C. This will make the period of vibration longer and the watch will lose from the effect of heat on the hairspring.= " Starting on p 193 is a long discussion of other alloys. Guillaume devised an alloy of iron and nickel called Invar (he got a Nobel prize fo= r this in 1920) and another called Elinvar (iron, nickel, chromium, mangane= se and tungsten). There are other alloys used in watch hairsprings--Nivarox= and Conel are mentioned. In all of these alloys, heat treatment affects the temp. coe. of E. The National Assoc. of Watch and Clock Collectors site at www.nawcc.c= om is interesting. Bob Barns _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Barometric floats and flat springs Date: Wed, 21 Oct 1998 12:45:26 -0400 Bob, That's great info. It's just what's needed to put together the whole picture. By the way, In my previous note to Sean-Thomas, I'd completely forgotten the obvious fact that the gross dimensions of the spring, in particular the thickness, do change with temperature, and that effects the stiffness of the spring and needs to be considered. Just tried a brute-force approach and put the changes into the spreadsheet for the STM-8 and looked at the changes in the results. If the thickness, length and width are all increased by 11 ppm and E is decreased by 240 ppm as you suggest, then near the (12cm, 2.25kg) point, the force changes by about -198ppm and the gap increases by 11ppm. After the spring is squeezed back to its original gap, the net force change comes out as about -161ppm or to be accurate, -161ppm/degC That's about -0.36mg/degC in the spring force. (or the corresponding in Newtons or dynes with a "g" in there somewhere). Anywhere close to what's being observed? Brett At 10:07 AM 10/21/98 -0400, you wrote: The expansion of steel is given in the tabel on p 46 >[gives 11ppm/deg C]. If we take three times this expansion, we shall get >approx. the corresponding change in the value of t^3 and therefore of Q, >namely 33 ppm increase due to the change in dimensions of the spring caused >by the temp, rise of 1 deg C, provided that E remains constant. This makes >the vibration quicker with increased temperature. > "But E for steel also varies with temp., for the material becomes more >yielding as it gets warmer. It has been found that at normal temps. E >decreases about 240 ppm/deg C. This will make the period of vibration >longer and the watch will lose from the effect of heat on the hairspring." _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "James M Hannon" Subject: Re: Leaf spring analysis Date: Wed, 21 Oct 1998 13:37:03 -0500 Brett, I have been trying to understand your leaf spring analysis and something is troubling me about the spring force curves. My understanding of the mechanical period of the mass spring combination is that if you want a long period you need the rate at which the force changes with amount of bending to be small. I may be all wet but I expected to see a portion in the middle of the curve that was almost vertical. This is based on my crude attempts at measuring a spring, bending one with my fingers and the mechanical period that is described as being obtainable with this sort of spring. On the other hand I attempted to calculate the period based on your theoretical curves for the STM-8 spring and came out with 1.3 seconds at the STM-8 operating point marked on the data. Sean's mathcad worksheet shows using 2.0 seconds for the mechanical period, which agrees well enough with the calculation of 1.3 sec. Jim Hannon _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Oscillator Circuit Update Date: Wed, 21 Oct 1998 15:15:56 -0500 (CDT) Rex, Thanks for the update on the oscillator schematic. Since it is a new drawing from the original hand drawings, I suspected that there would be typos. However, we made about 50 of them, and they still work. THe temp comp diodes are clearly reversed. In fact, we don't actually use a pot for the LM136, but a 10k R on one side of the adjustment pin, and select the resistor for the other side with a decade box, and use the closest 1% from our collection. Also. the PC board is laid out for the 4047, and we carved the foils to adapt it for the Statek rather than re-printing it. Regarding the 4018, the error is the connection between the three output Rs and the 100k from pin 1 to pin 11. The values were changed, and 100k was used rather than a jumper, to conserve power. THe remote tiltmeter systems in Alaska had to run for two years from the battery pack, so our power budget was 55 ma at 13 volts, or about 700 milliwatts total. The amplifier used at A1 for the regulated voltage is actually a micropower LM4250 with a 1meg current programming R in the original version. I have corrected the my drawing and will post it later this week, along the corrections of the amplifier/demodulator. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: CARRJJ@....... Subject: Re: New Event? Date: Wed, 21 Oct 1998 16:25:57 EDT There was a Richter 3.3 event in Farmville, VA overnight. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: Oscillator Circuit Update Date: Wed, 21 Oct 1998 16:37:05 -0400 S-T Morrissey wrote: >100k from pin 1 to pin 11. I will try the 100K in place of jumper and see how it works. I will modify my schematic accordingly. -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Giacomo Sperandini" Subject: R: large NZ quake today Date: Wed, 21 Oct 1998 22:43:38 +0200 thanks for information david. -----Messaggio originale----- Da: David A. Nelson A: psn-l@............. Data: mercoledì 21 ottobre 1998 2.29 Oggetto: large NZ quake today > > U.T.: 1998 October 20 2002 > NZST: 1998 October 21 9.02 a.m. > Lat, Long: 43.49S 169.08E > Location: 44 km north of Haast > Focal depth: 12 km > Magnitude: 6.1 > Felt widely in the lower South Island with some damage reported. > > > Dave > > this event overloaded all my sensors, one day i will get a strong motion >seismometer > > >Co-ordinator: >New Zealand >Public Seismic Network > Dave A. Nelson ZL4TBN > 24 Jensen St., > Green Is., Dunedin, > South Is.. New Zealand. > >http://psn.quake.net/dave/home.htm > >IF there indeed are other parallel universes... I can now rest in the >knowledge, that in at least one of them, I am filthy rich and drive a red >Ferrari > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: New Event? Date: Wed, 21 Oct 1998 19:22:24 -0700 Actually that event blew my 16 bit card of the chart. I'll post it in a bit. Barry J. D. Cooley wrote: > > I don't know where you live, Barry, but probably this is the one: > > A LIGHT EARTHQUAKE OCCURRED AT 01:31 AM PDT Wednesday, Oct 21, 1998. > THE MAGNITUDE 4.5 (ML) EVENT IS LOCATED 13 MILES WSW OF PORTOLA, CA > THE HYPOCENTRAL DEPTH IS 12.6 MILES. > > Earthquake location is poorly constrained because it occurs near edge > of seismic network. > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: leaf spring compensation Date: Wed, 21 Oct 1998 21:26:13 -0500 (CDT) Brett, You asked about the magnitude of the force change caused by temperature, suggesting about 0.36mg/degC. My experience is that it is considerably larger, at least on the prototypes. I originally used slider weights that weigh about 10 grams to trim the mass position . The trim mass effect of course depends on the mechanical period. It takes about 1cm of position change near the center of the boom, 10 cm from the hinges, to compensate for a 1 degC change. This force would be about doubled if applied above the lifting point of the spring, about 4 cm from the hinges. Of course, all this assumes that nothing else is contributing temperature changes. The motor driven weight of 20 grams needs about 7 turns at 32tpi, or about 0.5cm to compensate for about half the 1 degC temperature range, which causes a 7-volt offset of the mass position output, or about 200 microns with the feedback turned off. I need to modify the 4-second (BETA) unit with the period adjustment feature of the Gamma units to study this effect at longer periods. It may make matters worse. Since I have the motorized zeroing, I can repeat the experiment with more accuracy, since my microthermometers have milli-degree resolution, and I know the pitch of the thread of the translating rod, and can determine the weight. Unfortunately, I will have to disable the bimetallic compensation and the feedback first. With the single bimetallic spring compensation, the mass position change (with the feedback ON) is 20 microns/degC. I guess I will have to experiment on a prototype other than the one I am recording from. (by the way, did someone turn off the teleseisms greater than M=6 again?). Regarding the application of elinvar or a similar metal, the article in BSSA by Wielandt and Streckeisen describes the use of two metals installed in parallel which seems to accomplish the "cold thermostat" they describe. There is a photo of the sensor, as well as a diagram with dimensions of the semi-elliptical configuration. I have only seen the actual STS-1V spring momentarily while installing them: they don't work very well with the covers off. So we need to find some common material that gets more rigid as its temperature goes up. Currently, either the bimetallic element(s) or active electronic thermal feedback, with a very long time constant, have reduced the large temperature effect. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: N. Calif events Date: Wed, 21 Oct 1998 21:12:20 -0700 Hi All I was looking at the recent N.Cal events. It looks like the Sierra Nevada Fault may be trying to connect with the Mendocino Fault. I don't particularly want a front row seat. Regards Barry Separate Geographic comment: There are no members from two of the most seismicly active areas: South/Central America and Eastern Asia. . _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Bonnie Subject: GeE777@........ Date: Wed, 21 Oct 1998 22:14:51 -0600 PSN-L@.............. Seismic Event TEST TEST Hi, that must have been the test that was held on television around 9:00 or 10:00 a.m. I live very near to Norwalk, CA. Thanks Bonnie the crafty crafter Net-Tamer V 1.10 - Registered _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: N. Calif events Date: Wed, 21 Oct 1998 23:42:41 -0700 (MST) On Wed, 21 Oct 1998, barry lotz wrote: > I was looking at the recent N.Cal events. It looks like the Sierra > Nevada Fault may be trying to connect with the Mendocino Fault. I don't > particularly want a front row seat. > Regards > Barry Hi Barry, What was the time span you were looking at??? Which coordinates??? I would like to look at this also... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Oh good grief... Date: Thu, 22 Oct 1998 07:40:28 I was wondering why I wasn't getting any traffic from this list. I gess when I left the last time I forgot to log back on. Old timers desease... Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Leaf spring analysis Date: Thu, 22 Oct 1998 10:59:09 -0400 Jim, Good point. You are exactly right *if* the spring were the only factor. I've convinced myself that the "zero-length spring" (awful term) effect arises from a *combination* of the spring and the geometry. I'm currently trying to work that out for the STM-8. From what I have seen, period-extending geometries tend to have the spring acting at an angle to the boom, closer to the hinge at the top than at the bottom, and they usually have the mass set higher than the boom hinge. I'm hoping to get those numbers from Sean-Thomas, to see to what degree that's the case in his design. Then, using that geometry, you can graph the force required between the spring mounting points to balance the vertical force acting on the mass, vs the distance between those points, as the boom is rotated up and down. That gives you a second force-length curve. If that curve is adjusted to be tangent to the spring force-length curve at the equilibrium point, there will be virtually no net restoring force on the system as the boom moves slightly off equilibrium. That's the infinite-period situation you're looking for. If you set it up so that the curves intersect at a shallow angle, then the effective restoring force is finite, but small, and the natural period will just be extended. This will be a lot easier to see, once someone's done the graphs; but that's a few weeks off yet, for mine. Good luck with your project. Brett > > >Brett, >I have been trying to understand your leaf spring analysis and something is >troubling me about the spring force curves. My understanding of the >mechanical period of the mass spring combination is that if you want a long >period you need the rate at which the force changes with amount of bending >to be small. I may be all wet but I expected to see a portion in the >middle of the curve that was almost vertical. This is based on my crude >attempts at measuring a spring, bending one with my fingers and the >mechanical period that is described as being obtainable with this sort of >spring. > > On the other hand I attempted to calculate the period based on your >theoretical curves for the STM-8 spring and came out with 1.3 seconds at >the STM-8 operating point marked on the data. Sean's mathcad worksheet >shows using 2.0 seconds for the mechanical period, which agrees well enough >with the calculation of 1.3 sec. > >Jim Hannon > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "L&B Orme" Subject: Re: N. Calif events Date: Thu, 22 Oct 1998 09:01:42 -0700 I, too, would be interested in hearing all comments. I *have* a front row seat... Barb in Chico, CA. 98/10/14 15:05:46 40.84N 123.57W 26.1 4.0 8 mi SSE of WILLOW CREEK 98/10/17 06:32:14 39.37N 120.55W 11.5 3.4 20 mi W of TRUCKEE 98/10/19 07:01:43 40.45N 125.65W 4.9 3.3 69 mi W of PUNTA GORDA 98/10/19 08:16:28 40.48N 122.39W 0.0 2.2Md C* 11 km S of Redding, CA 98/10/19 08:21:47 40.21N 122.70W 12.8 2.1Md C* 38 km W of Red Bluff, CA 98/10/19 12:28:47 39.97N 120.88W 9.2 2.5Md D* 6 km NE of Quincy, CA 98/10/19 21:40:28 40.75N 122.31W 3.9 2.1Md C* 20 km NNE of Redding, CA 98/10/20 04:06:40 40.85N 123.33W 28.2 2.5Md B* 35 km WNW of Weaverville, CA 98/10/20 18:39:23 39.73N 120.65W 0.1 2.8Md C* 17 km WSW of Portola, CA 98/10/21 08:31:01 39.72N 120.68W 20.2 4.1Mw C* 20 km WSW of Portola, CA 98/10/21 08:36:03 39.75N 120.65W 12.4 3.0Md C* 17 km WSW of Portola, CA 98/10/21 09:02:25 39.75N 120.66W 6.8 2.6Md D* 17 km WSW of Portola, CA -----Original Message----- From: John Hernlund Date: Wednesday, October 21, 1998 11:44 PM >On Wed, 21 Oct 1998, barry lotz wrote: >> I was looking at the recent N.Cal events. It looks like the Sierra >> Nevada Fault may be trying to connect with the Mendocino Fault. I don't >> particularly want a front row seat. >> Regards >> Barry > >Hi Barry, > What was the time span you were looking at??? Which coordinates??? I >would like to look at this also... > >*************************************************************************** *** > > John Hernlund _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Annales Geophysicae Article Date: Thu, 22 Oct 1998 09:07:22 -0700 (MST) For everyone that was interested, I posted the Annales Geophysicae Article at the following URL: http://www.public.asu.edu/~hernlund/articles/ The six pages are jpegs around 500 k in size... I didn't spend much time compressing them. ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "James M Hannon" Subject: Re: Leaf spring analysis Date: Thu, 22 Oct 1998 11:13:25 -0500 Brett, I suspect you are right about the geometry. I had convinced myself that for the leaf spring arrangnment the geometry didn't matter because of the very small displacments involved but it's the only way to get to the long periods. Since I want to tilt the whole insturment up at an angle I had better sit down and figure things out before I get too far along. Thanks, Jim Hannon Brett Nordgren on 10/22/98 09:59:09 AM Please respond to PSN-L Mailing List To: PSN-L Mailing List cc: Subject: Re: Leaf spring analysis Jim, Good point. You are exactly right *if* the spring were the only factor. I've convinced myself that the "zero-length spring" (awful term) effect arises from a *combination* of the spring and the geometry. I'm currently trying to work that out for the STM-8. From what I have seen, period-extending geometries tend to have the spring acting at an angle to the boom, closer to the hinge at the top than at the bottom, and they usually have the mass set higher than the boom hinge. I'm hoping to get those numbers from Sean-Thomas, to see to what degree that's the case in his design. Good luck with your project. Brett _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: SDR and amps and such Date: Thu, 22 Oct 1998 17:27:31 +0000 I finally got my ADC card in my computer. Nothing is connected yet. I plan on playing with WWV this weekend and maybe an unamplified geophone. I was playing with the new SDR 2.5 last night and I pressed "E" to make it record an event. The question I have is, how do I go from the raw data file to an event file? The raw data is recorded as a file, but Winquake won't show it in the file window. I changed the directory, but appearantly it ignores everything that's not an event file. Maybe you can do it with SDR? I'm still flipping coins on an amplifier. I have at least four choices now. 1. Get Larry's amp. I like the idea of just giving him some more money and getting an amp that works quickly, but I'd like to burry the thing eventually. Larry's amp requires a power line. Unless I put it inside of all kinds of conduit and pipes and boxes, there's a fire hazard. 2. Try and make one like Sean-Thomas uses. I have to have the board laid out and manufactured. Then I have to buy all of the components and solder them in. As I've mentioned before, I can't solder very well. 3. Try and make a simpler one like http://met.univnorthco.edu/resource/amp.htm Similar problems with #2. I don't know enough about electronics so the qualities are a bit of an unknown. The parts are only about $20 though. 4. Talk to some really generous local electronics student and try and get them to design one for me. For a small fee of course. Students can mess things up and take a long time. An EE would cost too much almost certainly. So I guess I need some oppinions. I might remind you that I'll be connecting to a geophone. When I have a little more room, I might finish my Lehman and connect it up. TIA, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: seis drawing Date: Thu, 22 Oct 1998 12:50:08 -0500 (CDT) Brett, For your info and for the list: May I again ask that large binary attachments, such as .jpeg files, not be included in the email. I read mail at home here, on an old 486 dialed into the unix server at the U on an old modem that connects to an equally old modem on the server that has priority zip, so it shuts down if anything else happens on the mailhost access. I usually try to catch large emails by their size and aviod them, but sometimes I try to read a message that has a large embedded attachment, and can only wait for all the gibberish to go by, or hope the modem disconnects, which it did on your .jpeg file. Unfortunately, a number of people have sent me things that I have no way of opening or reading. If they were put somewhere that I can download them when I am using Netscape, I could look at them. Unfortunately, I am a bit old fashioned wrt PC,s; my computer experience began in 1960 on an IBM 1360 with punched cards and object decks, etc., but I have never had the time to get really saavy with what is currently available. Regarding your autosketch drawing: I assume that you have seen the current drawing of the seismometer geometry that I have posted. It has all the pertinent dimensions, but needs some corrections, like the proper angle of the suspensions at the ends of the leaf spring, and the bimetallic compensation has to be shown. I can update the drawing, which is autosketch, and export it as a .dxf file, and put it at: http://www.eas.slu.edu/People/STMorrissey/etc.export. It is done to scale, so unknown dimensions can be read with autosketch. Later I will clarify exactly what a "zero length" spring actually is, which will show why the leaf spring cannot actually be one. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: W6JRF@....... Subject: Re: Oh good grief... Date: Thu, 22 Oct 1998 14:14:28 EDT Of all the things I have lost, I miss my mind the most..........Welcome Back Norm. I'm glad to see I not the only one that does things like that! But theres hope, you remembered how to get back!!!!! 73's Bob, W6JRF _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: SDR and amps and such Date: Thu, 22 Oct 1998 13:01:45 -0600 > > > 1. Get Larry's amp. I like the idea of just giving him some more money > and getting an amp that works quickly, but I'd like to burry the thing > eventually. Larry's amp requires a power line. Unless I put it inside of > all kinds of conduit and pipes and boxes, there's a fire hazard. > Greg: I have one of Larrys 3 amp circuits. It should be close to the seismometer, but it doesn't have to be with the seismometer....i.e., bury the seismo (geophone), and have the amplifier as close to the output wires coming out of the ground as you can, or, use shielded wire cable to where ever you can put it safely. Larrys amplifiier is reliable, thats for sure. If you homebrew, as things normally go....it, or whatever homebrew circuit you try...may need repair, corrections etc....especially for people like me, who have little electronics experience. Reliable means less time, effort and really money in the long run. > 2. Try and make one like Sean-Thomas uses. I have to have the board laid > out and manufactured. Then I have to buy all of the components and > solder them in. As I've mentioned before, I can't solder very well. > > 3. Try and make a simpler one like > http://met.univnorthco.edu/resource/amp.htm > Similar problems with #2. I don't know enough about electronics so the > qualities are a bit of an unknown. The parts are only about $20 though. Greg: If I remember right, this circuits main IC, the chopper is obsolete, and no longer easily available. A substitute would have to installed, but, with that could come problems of a suitable matchup....and I'am no expert either. I like the circuit and text on this one mainly for the explanations given though....anything helps. That type of IC, is I think not even replaceable now. > > > 4. Talk to some really generous local electronics student and try and > get them to design one for me. For a small fee of course. Students can > mess things up and take a long time. An EE would cost too much almost > certainly. > > So I guess I need some oppinions. I might remind you that I'll be > connecting to a geophone. When I have a little more room, I might finish > my Lehman and connect it up. > > TIA, > Greg -- Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: Oh good grief... Date: Thu, 22 Oct 1998 14:53:44 At 02:14 PM 10/22/98 EDT, you wrote: >Of all the things I have lost, I miss my mind the most..........Welcome Back >Norm. >I'm glad to see I not the only one that does things like that! But theres >hope, you remembered how to get back!!!!! 73's Bob, W6JRF > Good time to ask the question, Did ted ever get the emon working for the 150rs moduals? Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: N. Calif events Date: Thu, 22 Oct 1998 14:56:05 > >>On Wed, 21 Oct 1998, barry lotz wrote: >>> I was looking at the recent N.Cal events. It looks like the Sierra >>> Nevada Fault may be trying to connect with the Mendocino Fault. I don't >>> particularly want a front row seat. >>> Regards >>> Barry >> >>Hi Barry, >> What was the time span you were looking at??? Which coordinates??? I >>would like to look at this also... >> Yea, Its been nice and quiet til now. Looks like the whole state is starting back up from the map this week. Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ted Blank Subject: Re: Oh good grief... Date: Thu, 22 Oct 1998 16:27:11 -0700 (PDT) Hi, Sorry, that little project didn't work out. The support for serial port I/O in the MS QuickBasic compiler is pretty spare, so after several weeks of trying I had to give up. It would have been nice to be able to collect data from a portable PC via serial port. Ted Blank San Jose, California On Thu, 22 Oct 1998, Norman Davis WB6SHI wrote: > At 02:14 PM 10/22/98 EDT, you wrote: > >Of all the things I have lost, I miss my mind the most..........Welcome Back > >Norm. > >I'm glad to see I not the only one that does things like that! But theres > >hope, you remembered how to get back!!!!! 73's Bob, W6JRF > > > Good time to ask the question, Did ted ever get the emon working for the > 150rs moduals? > > > Norman Davis WB6SHI > Shingle Springs, Ca > normd@............. > http://www.directcon.net/normd/index.htm > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian Smith Subject: Re: Oh good grief... Date: Thu, 22 Oct 1998 13:59:44 -1000 Ted Blank wrote: > Hi, > Sorry, that little project didn't work out. The support for serial > port I/O in the MS QuickBasic compiler is pretty spare, so after several > weeks of trying I had to give up. It would have been nice to be able to > collect data from a portable PC via serial port. > Hi, I actually have my seismic pc running compiled QB and reading data from a serial port. Works great, 19200 baud 8 bit etc. I can forward the 1 line of code when I get home if you like. cheers _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: N. Calif events Date: Thu, 22 Oct 1998 18:59:34 -0700 John I was just looking at the USGS Menlo Park calif/nevada plot of recent events. My comment was part serious and part tongue in cheek. I have compiled a couple hundred years of calif/nevada events/ reported events but that's another story. Regards Barry John Hernlund wrote: > On Wed, 21 Oct 1998, barry lotz wrote: > > I was looking at the recent N.Cal events. It looks like the Sierra > > Nevada Fault may be trying to connect with the Mendocino Fault. I don't > > particularly want a front row seat. > > Regards > > Barry > > Hi Barry, > What was the time span you were looking at??? Which coordinates??? I > would like to look at this also... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: SDR and amps and such Date: Fri, 23 Oct 1998 02:01:25 +0000 Thanks very much for the comments and responses. I'm still not certain about the preamp, because now there's another choice. ;) Next time I'll read the manual on SDR. You'd think I'd know better or something. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: seis drawing Date: Thu, 22 Oct 1998 22:38:58 -0400 Sean-Thomas, Awfully sorry about the attachment, I'd hoped 19k wouldn't cause you any problems. I do have vertseis5.gif, if that's the drawing you were referring to, but was having a little difficulty finding a couple of the dimensions that I wanted. If sometime you could put the .dxf file in your export directory, I'd be most happy to get it and scale it directly. Regarding temperature effects: I will now write a hundred times "Kilograms times 1000 gives grams. Kilograms times 1,000,000 gives milligrams". Re-did the thermal effect computation a little more carefully. Final result at the 12 cm, 2.25 kg point is a spring force change of -193 ppm per degree C. Times 2.25 kg gives -433mg per degree C. I'm still not sure that completely agrees with your observations, but now at least I'm closer by three orders of magnitude. In looking at the period-lengthening geometry, I am getting a gut feeling that extending the natural period may also amplify the effects of thermal changes. That very much remains to be proven, but it's one of the things I want to look into. Until you mentioned it, I didn't know that the STS-1 had a multiple-material spring; and until I saw the numbers, yesterday, it wouldn't have made any sense. However, consider making a spring out of Ni-Span-C, and assume that it has a perfectly stable elastic modulus, E. Due to its coefficient of linear expansion of +7.6 ppm / deg.C its force will go up with temperature, a little more than 7.6 x 4, say +33 ppm per degree C. Perhaps by cleverly combining that with spring steel, which has a force that goes down with temperature, you can get them to offset each other's effects. Bet it's not easy! With all this discussion about temperature effects on the spring, we haven't talked about thermal expansion effects on other parts of the system, like for example boom-length. Have a feeling that's not trivial, either. Regards, Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: [Fwd: High school student participation at AGU] Date: Thu, 22 Oct 1998 22:28:52 -0600 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Catherine- One of the PSN presentations at December AGU (Blank & Froom): 11428 Ted Blank S 6605 7294 Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum plans to include students from Almaden High School as presenters of their poster. How can we make an arrangement with AGU to give passes to the designated students? -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Edward Cranswick Subject: Re: High school student participation at AGU Date: Thu, 22 Oct 1998 22:30:52 -0600 Catherine- Thank you very much for your help in this matter. You would think that if AGU supports outreach and education, they would want to start at home, so to speak, i.e., at AGU meetings. Do you know any other people that I also ahould contact about this? -Edward Catherine Johnson wrote: > Dear Edward, > > I'm forwarding your email to someone at AGU who will > know what to do about this. I don't think that there > is currently a satisfactory mechanism in place for > getting high school students to the meeting. I think > that technically they would have to register as non-members > which is really expensive (~$300 for the week). However, > AGU, after much persuasion has finally instigated an > undergraduate registration fee of $15 for one day and $30 for > the week, so I'm wondering if we can somehow get this kind of > rate. > > I'll let you know if I get any info from the folks at AGU. > > Best regards, > Catherine > > ----------------------------------------- > Dr. Catherine Johnson > Education and Outreach Program Manager > IRIS > 1200, New York Ave., #800 > Washington DC 20005 > > Tel: (202) 682 2220 > Fax: (202) 682 2444 > Email: catherine@........ > Web: http://www.iris.washington.edu/EandO > Personal web page: http://magellan.ciw.edu > ----------------------------------------- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Magnets source.... Date: Thu, 22 Oct 1998 23:48:45 -0600 My God, Meredith, I just checked out your websites, and I don't know what hit me!!! meredith lamb wrote: > Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html > > and secondary site: > http://www.geocities.com/ResearchTriangle/Facility/1739/index.html -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Students at the AGU meeting. Date: Fri, 23 Oct 1998 00:12:11 -0600 Catherine- I have been out of the office for the last couple of days, picking up our instruments deployed to monitor the Pymatuning Earthquake , and so I am reading/replying to all your messages now. I will pass on this information about the AGU registration and membership. Thank you for your help. -Edward Catherine Johnson wrote: > Dear Ed, > > Here's the reply from AGU. The most $-effective option > is for the students to become AGU members and then they > can register as undergrads. Please let me know the names > of people who will be doing this so that I can pass the > info onto Frank Ireton at AGU in case there are any problems. > > Best regards, > > Catherine > > >From: FIreton@....... > >Date: Wed, 21 Oct 1998 09:49 -0400 (EDT) > >Subject: Students at the AGU meeting. > >To: catherine@........ > >MIME-version: 1.0 > >Status: > > > > Catherine, > > > > Sorry for the delay getting back to you. We had to get approval from > > Fred. He said that if they will join AGU they can register as > > undergraduate students. That will be a significant saving over > > member's registration prices. That information can be found on the AGU > > home page. Please keep me posted on the outcome. > > > > Frank > > > > ----------------------------------------- > Dr. Catherine Johnson > Education and Outreach Program Manager > IRIS > 1200, New York Ave., #800 > Washington DC 20005 > > Tel: (202) 682 2220 > Fax: (202) 682 2444 > Email: catherine@........ > Web: http://www.iris.washington.edu/EandO > Personal web page: http://magellan.ciw.edu > ----------------------------------------- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian & Liz Subject: Re: Oh good grief...QB serial i/o Date: Thu, 22 Oct 1998 19:38:31 -1000 Hi, the magic line of QB for serial i/o is: OPEN "COM1:19200,N,8,2,CS,DS,RB64000,TB10240" FOR RANDOM AS #1 obviously in this case, 19200 baud, no parity, 8 bits data, 2 stop bits. CS and DS are important, they tell the port not to hardware handshake. Without them it will try to handshake with the connected device, and chances are those lines of the serial cable won't even be connected, causing the port to lock, and giving the appearance of being dead. RB and TB specify the size of the i/o buffers. Very useful for data taking as data will still buffer (at interrupt level) when the pc is busy doing other things (in most cases). If your system still appears to be dead then swap pins 2 and 3 on the 25 way D type connector. These are the Rx/Tx lines, and may be the wrong way round. Swap them back if that doesn't work and think again. It seems to be a law of physics that 1: it takes a minimum of 2 hours to get a serial line to work, 2: once working, never go wrong! Hope that helps. cheers Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Magnets source.... Date: Thu, 22 Oct 1998 23:27:10 -0700 I think it looks like the insides of a UFO.... Wheres Art Bell when you need him . -Larry PS: For those of you who don't know, Art Bell is (or was, he just went off the air for some reason) a radio talk show host that talks about anything weird. IMHO, a real nut case.... At 11:48 PM 10/22/98 -0600, Edward wrote: >My God, Meredith, I just checked out your websites, and I don't know what >hit me!!! > >meredith lamb wrote: > >> Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html >> >> and secondary site: >> http://www.geocities.com/ResearchTriangle/Facility/1739/index.html > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: CARRJJ@....... Subject: Re: High school student participation at AGU Date: Fri, 23 Oct 1998 10:55:47 EDT There is also Project Inspire for high school student. It hunts for spherics and whistlers (natural radio signals). Bill Pine at Chaffey High School in Ontario, CA is the director. They can be found on the NASA web site. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lahr@.................. Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 10:31:23 -0600 (MDT) Ian, Which serial AD are you using? I'm interested in using the serial input for a portable display of a geophone for educational purposes. Basically the computer is just used as an oscilloscope. What sets the sampling rate? Would this same code work with Visual Basic? Thanks, JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan Ian writes: The magic line of QB for serial i/o is: OPEN "COM1:19200,N,8,2,CS,DS,RB64000,TB10240" FOR RANDOM AS #1 obviously in this case, 19200 baud, no parity, 8 bits data, 2 stop bits. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 12:55:23 EDT Hi I'll just add my two bits here. I use Vernier Software Multipurpose Lab Interface Program for Windows. It includes a interface board, MPLI Connector Box & test leads. I built a preamp much like they show on page 53 of their instruction manual and added an anti-aliasing filter. The Hardware has 3 inputs thus is suited for three component recording. They are located at- Vernier Software 8565 S. W. Beverton-Hillsdale Hwy Portland, Oregon 97225-2429 Phone (503) 297-5317 Fax (503) 297-1760 George Erich Seismic Exploration Consultant P. O. Box 2011, Norwalk, CA 90650, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W In a message dated 10/23/98 9:32:26 AM Pacific Daylight Time, lahr@.................. writes: << I'm interested in using the serial input for a portable display of a geophone for educational purposes. Basically the computer is just used as an oscilloscope. >> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: From (UFO) Teleseisms Control...?? Date: Fri, 23 Oct 1998 10:58:17 -0600 S-T Morrissey wrote: > (by the way, did someone turn off > the teleseisms greater than M=6 again?). Yes....I did it. I'am still looking for some "advertisers" for the PSN Trading Post deal, and well...I haven't seen hide nor hair of anything from anybody yet. So......this means all of you people are being forced under denial of any more teleseisms.... till some of you cough up some material for sale/trade or want; too me. Sorry......but thats the law of the wild west. Occasionally I might turn it on again to test some of my junkque here, but..... remember every time its teleseismically quiet, that I need some more stuff, to stuff, the understuffed list....ha. If this goes on long enough, I might even have to get back to my concrete stepping stone idea for a seismometer base....and come out with a lengthy, rambling, unqualified and meaningless message on the results. Shudder!! (Are you motivated now?) Hmm..... some of you might even want to read it?? Besides....my seismometers also need the long period seismic exercise too. I'am getting tired of binking the masses with my (UFO) tektite, to see if they still work. I now return control of your email to you.....or.....beam me back to earth..... Meredith Lamb, the PSN Trading Post spam man _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian Smith Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 09:13:18 -1000 Hi, I'm actually using something completely non-standard (in this group). It's an old cast-off Omega standalone DAQ. You plug it in, it has it's own cpu(8086!), you send it commands over the serial interface and it sends back data. 12 bits, 16 channels etc. The advantage is it takes the load off the pc (the daq can also do things like mean multiple samples and the timing), the disadvantage is it's something else to leave switched on (fire hazard). I know you can get pcmcia a/d cards, if your portable display is on a laptop then that would be a solution, I just can't remember who sells them at the moment. You can obviously get modern versions of what I have, http://www.omega.com/products/prodlist.html is one web page of interest. I've never played with Visual Basic, so I don't know if the code for serial i/o will look like the QB one. I use mathcad for non-realtime but digitally filtered data display. cheers Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lahr@.................. Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 13:28:30 -0600 (MDT) Ian, Thanks for the extra details. I'll check out Omega's page. I'm interested in a very inexpensive AD that attaches to either the serial or parallel ports and a program in Visual Basic to display the trace. I have one called LPT1 that connects to the parallel port. It consists of only one chip on a board inside the the parallel port plug. However, I don't have any source code to go with it. JCLahr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 19:40:11 +0000 Ian Smith wrote: > something else to leave switched on (fire hazard). I know you can get > pcmcia a/d cards, if your portable display is on a laptop then that would be > a solution, I just can't remember who sells them at the moment. Of course none of these would work with SDR but, he just wanted a computer oscope. There are the serial port DI-150RS and USB port models at DATAQ : http://www.dataq.com/ I found a couple PCMCIA models at : http://www.adac.com/background/navigate.html#PIB Some PCMCIA boards at : http://www.keithley.com/ also. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 16:03:46 -0700 (PDT) I received the DATAQ Instruments serial port a/d waveform recording system last week and it is excellent. The internet special price of $49.95 includes serial hookup cable, The DI-150RS A/D module(exact same as radio shack is selling for $99.95) the recording/display/analysis software, a thermistor for temperature measurement, and full documentation and use manual. It is a two channel system. One nice feature is that you can change channel amplification with the click of the mouse, and it has a times 100 amplification feature. I hooked up a vertical magnet, spring coil arrangement and recorded footsteps 20 feet away with no external amplifier. The system was easily measuring disturbances at the millivolt level without external amplification. Anyway its a cheap way to record signals without installing a card in your computer. Greg Bajuk On Fri, 23 Oct 1998 lahr@.................. wrote: > > Ian, > > Which serial AD are you using? I'm interested in using the > serial input for a portable display of a geophone for > educational purposes. Basically the computer is just used > as an oscilloscope. > > What sets the sampling rate? > > Would this same code work with Visual Basic? > > Thanks, > JCLahr > ################################## John C. Lahr > ################################# Seismologist > ################################ U.S. Geological Survey > ############################### Geologic Hazards Team, MS966 > ############################## PO Box 25046 > #############################/############################## > ############################/############################### > Denver, Colorado 80225-0046 ################################ > Phone: (303) 273-8596 ################################## > Fax: (303) 273-8600 ################################### > lahr@........ ##################################### > http://giseis.alaska.edu/lahr > http://lahr.org/john-jan > > Ian writes: > > The magic line of QB for serial i/o is: > > OPEN "COM1:19200,N,8,2,CS,DS,RB64000,TB10240" FOR RANDOM AS #1 > > obviously in this case, 19200 baud, no parity, 8 bits data, 2 stop bits. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: VBB Oscillator Circuit Date: Fri, 23 Oct 1998 20:24:47 -0400 I have just posted my revised circuits of Sean Morrissey's circuit on on my web page. I have wired it as shown and it appears to work. -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... http://www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian Smith Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 15:23:37 -1000 Gregory Bajuk wrote: > I received the DATAQ Instruments serial port a/d waveform recording system > It looks quite exciting. Do you know if the software runs on NT? I downloaded http://www.dataq.com/upgrade/wdqcemps.exe to see what the software looked like, but got an error message saying that the software was not for my machine type. What does the noise level look like on the sampled waveform? Presumably the rs232 "power lines" are filtered to remove the digital noise from the pc(?). Thanks for alerting me to that. cheers Ian smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: VBB Oscillator Circuit Date: Fri, 23 Oct 1998 21:20:44 -0500 (CDT) Rex, You beat me to it; I was going to wait until next week. So I just now scanned my revisions of both the VRDT oscillator and the VRDT amplifier/demodulator to: http://www.eas.slu.edu/People/STMorrissey/index.html (to the figures.... page) I'm sure that the parts list you have made will be of great help; do you intend to fill it out with source and price info? I am still working on the demodulator noise problem, but I doubt that I can improve it much more. The displacement noise is now about 0.1 nanometers in the 10hz to 10 second range, increasing as expected with the period ( ie. 1/f noise). Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Pete Subject: Re: QB serial AD input Date: Fri, 23 Oct 1998 23:23:27 -0700 Ian, I use the DI150RS, it works well and the noise appears to be low. They do have an NT version. The viewer software is very powerful! Pete Fleming Ian Smith wrote: > Gregory Bajuk wrote: > > > I received the DATAQ Instruments serial port a/d waveform recording system > > > > It looks quite exciting. Do you know if the software runs on NT? I > downloaded http://www.dataq.com/upgrade/wdqcemps.exe to see what the > software looked like, but got an error message saying that the software was > not for my machine type. > > What does the noise level look like on the sampled waveform? Presumably the > rs232 "power lines" are filtered to remove the digital noise from the pc(?). > > Thanks for alerting me to that. > > cheers > > Ian smith > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: VBB Oscillator Circuit Date: Sat, 24 Oct 1998 09:58:39 -0400 This is not a bad idea! People might be able to find better prices. I will attempt to post a spreadsheet with prices and sources I used. S-T Morrissey wrote: > > do you intend to fill it out with source and price info? > -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Francesco" Subject: WINQUAKE GIF FORMAT Date: Sat, 24 Oct 1998 18:45:32 +0100 I have a serious problem using winquake. When save the file in gif = format, the program communicates this error: "error making gif image: = unsupported bits/pixel =3D 32." I use a pc pentium 350 with video resolution of 600X800, but the same = thing also happens with a pentium 133 with small resolution; not, with a = Ibm Think Pad notebook . Does nobody have had the same problem? Thank you for the help. Francesco - I.E.S.N. PSN Italy

I have a serious problem using = winquake. When=20 save the file in gif format, the program communicates this error: =20 "error making gif image: unsupported bits/pixel =3D = 32."
 
I use a pc pentium 350 with video=20 resolution  of 600X800, but the same thing also happens with a = pentium 133=20 with small resolution; not, with a Ibm Think Pad=20 notebook .
 
Does nobody have had the same=20 problem?
 
Thank you for the help.
 
Francesco  -  I.E.S.N. PSN = Italy
From: Greg Subject: Re: WINQUAKE GIF FORMAT Date: Sat, 24 Oct 1998 11:32:01 -0700 > Francesco wrote: > > I have a serious problem using winquake. When save the file in gif > format, the program communicates this error: "error making gif image: > unsupported bits/pixel = 32." I just tried to make an image in Winquake 2.5.2 32bit. My screen is set to 1024x768x32bits/pixel. I used copy while an event was on the screen and the image moved to the clipboard. I then pasted it into another program which made a jpeg from it. It worked. Then I tried to save as gif 600x800 and it gave me your error message. So a workaround would be the above until Larry fixes it, I guess. For Larry: I have a an old PCI 4 Meg Matrox Millenium. This is under Windows 95. Let me know if you want me to try it at a lower color depth. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ted Blank Subject: Re: Oh good grief...QB serial i/o Date: Sat, 24 Oct 1998 18:33:24 -0700 (PDT) Thanks, Ian. Ted Blank San Jose, California On Thu, 22 Oct 1998, Ian & Liz wrote: > Hi, > > the magic line of QB for serial i/o is: > > OPEN "COM1:19200,N,8,2,CS,DS,RB64000,TB10240" FOR RANDOM AS #1 > > obviously in this case, 19200 baud, no parity, 8 bits data, 2 stop bits. > > CS and DS are important, they tell the port not to hardware handshake. Without > them it will try to handshake with the connected device, and chances are those > lines of the serial cable won't even be connected, causing the port to lock, and > giving the appearance of being dead. > > RB and TB specify the size of the i/o buffers. Very useful for data taking as data > will still buffer (at interrupt level) when the pc is busy doing other things (in > most cases). > > If your system still appears to be dead then swap pins 2 and 3 on the 25 way D type > connector. These are the Rx/Tx lines, and may be the wrong way round. Swap them > back if that doesn't work and think again. > > It seems to be a law of physics that 1: it takes a minimum of 2 hours to get a > serial line to work, 2: once working, never go wrong! > > Hope that helps. > > cheers > > Ian Smith > > > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: WINQUAKE GIF FORMAT Date: Sat, 24 Oct 1998 22:31:42 -0700 At 06:45 PM 10/24/98 +0100, Franceso wrote: >>>> I have a serious problem using winquake. When save the file in gif format, the program communicates this error: "error making gif image: unsupported bits/pixel = 32." I use a pc pentium 350 with video resolution of 600X800, but the same thing also happens with a pentium 133 with small resolution; not, with a Ibm Think Pad notebook . Does nobody have had the same problem? Thank you for the help. Francesco - I.E.S.N. PSN Italy <<<<<<<< This is a problem with the GIF "C" function library I'm using. It only handles 16 color, 256 color and I think 65K color modes. You probably have your system set for "True Color" mode. You can either change the number of bits per pixels, using the Display settings in the Control panel, to either 256 colors or maybe 65k colors. Or you can use the systems clipboard and transfer the bitmap image to another program like LView Pro and save the image as a GIF file from there. In WinQuake you use the View / Copy menu items to copy the image to the clipboard. -Larry Cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: SDR and amps and such Date: Sun, 25 Oct 1998 00:28:38 -0700 At 05:27 PM 10/22/98 +0000, Greg wrote: >I finally got my ADC card in my computer. Nothing is connected yet. I >plan on playing with WWV this weekend and maybe an unamplified geophone. >I was playing with the new SDR 2.5 last night and I pressed "E" to make >it record an event. The question I have is, how do I go from the raw >data file to an event file? The raw data is recorded as a file, but >Winquake won't show it in the file window. I changed the directory, but >appearantly it ignores everything that's not an event file. Maybe you >can do it with SDR? > There are two file types involved with SDR. One is the daily record file(s). This contains all of the data (samples) from each channel and is not readable by WinQuake. SDR uses these files, a new one is created each day, too create PSN formatted event files that WinQuake can read. Event files are created when the system is triggered from an event, using the replay feature (the "r" key), or pressing the "E" key to force an event file(s). Event files show up in a directory based on the root directory supplied by the "Event File(s) Dir:" setting under the F5 settings and the year and month (YYMM). An event file this month would show up in the directory \root\9810\. If you network your data logging system and your main computer you can set up SDR so that your event files show up on your main computer system. This way you won't need to use floppies to transfer event files. You do need to keep two systems running all the time for this too work...See the documentation for more info. >I'm still flipping coins on an amplifier. I have at least four choices >now. > >1. Get Larry's amp. I like the idea of just giving him some more money >and getting an amp that works quickly, but I'd like to burry the thing >eventually. Larry's amp requires a power line. Unless I put it inside of >all kinds of conduit and pipes and boxes, there's a fire hazard. > >2. Try and make one like Sean-Thomas uses. I have to have the board laid >out and manufactured. Then I have to buy all of the components and >solder them in. As I've mentioned before, I can't solder very well. > >3. Try and make a simpler one like >http://met.univnorthco.edu/resource/amp.htm >Similar problems with #2. I don't know enough about electronics so the >qualities are a bit of an unknown. The parts are only about $20 though. > >4. Talk to some really generous local electronics student and try and >get them to design one for me. For a small fee of course. Students can >mess things up and take a long time. An EE would cost too much almost >certainly. > >So I guess I need some oppinions. I might remind you that I'll be >connecting to a geophone. When I have a little more room, I might finish >my Lehman and connect it up. This is what I would do... First; try running the cable from the sensors into the house and have the amp / filter card there. Geophones are fairly low impedance and high output voltage so it maybe able to drive the cable without having to place the amp / filter outside. Maybe with some good quality cable, and if the length isn't to long, you might be able to get away with this. If this does'nt work, I would place the amp near the sensor, but not burry it. The few feet of wire, unless you can burry the sensor very deep, between the sensor and the amp will not effect things. Too power the amp, you could run 3 more wires (or two wire + shield cable) and have the AC power transformer inside. The amp board requires a center tapped 24 to 26 volt VAC transformer to power it. This low voltage should be safe to run between the house and the amp card. You could also place two fuses at the transformer end. Another way to power the board is to use a dc to dc converter located in the box with the amp. This could take +5 or +12 volts in, from a wall mounted dc power supply inside the house, and supply the need +- 15 to +- 20 volts needed to power the on board +-12 volt power regulators. The converter would need 400ma (or more) of output current. This way you would only need to run two more wires, or a single coax wire to power the board. A note about water proofing.. A friend of a friend once said about placing electronic equipment in a water tight box. "Do whatever you can too keep the water out. Then drill a hole at the lowest point of the box so that the water can run out". -Larry Cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: SDR and amps and such Date: Sun, 25 Oct 1998 07:53:32 -0800 At 12:28 AM 10/25/98 -0700, Larry wrote: >A note about water proofing.. A friend of a friend once said about placing >electronic equipment in a water tight box. "Do whatever you can too keep >the water out. Then drill a hole at the lowest point of the box so that the >water can run out". My $.02 here: Put a bag of dessicant inside the "waterproof" enclosure. Otherwise you may get condensation when it cools off, and with the voltages present you'll get electrolysis that will quickly ruin the board. Take the dessicant out once in a while and bake it in the oven at low temp for a while to dry it out, then put it back in. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Barometric floats and flat springs Date: Sun, 25 Oct 1998 13:47:15 -0800 Brett et al Does anyone know what the change in modulus of spring steel vs temp might be ? Regards, Barry Brett Nordgren wrote: > snip--- > In Shanley, "Strength of Materials" he describes five characteristics of > the Modulus of Elasticity. Number 4 is: "The modulus of elasticity > decreases with increasing temperature - This can be explained by atomic > theory, but for engineering purposes the value of E is best determined > experimentally at the desired temperature". > snip--- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Barometric floats and flat springs Date: Sun, 25 Oct 1998 17:22:32 -0500 Barry, The only number I've ever seen was one Bob Barns quoted from a book, that he posted last Wednesday. Since E itself is very similar among different varieties of steel, it wouldn't surprise me if the tempco of E was also pretty similar. From R. Barns: > The following quote is from "The >Science of Clocks & Watches" by AL Rawlings, 3rd., ed., 1993. (Fascinating >reading for those interested in mechanical devices.).............. ............................ > "But E for steel also varies with temp., for the material becomes more >yielding as it gets warmer. It has been found that at normal temps. E >decreases about 240 ppm/deg C. This will make the period of vibration >longer and the watch will lose from the effect of heat on the hairspring." .......................... If anyone comes up with a good source on the subject, I would be very interested, too Regards, Brett At 01:47 PM 10/25/98 -0800, you wrote: >Brett et al > Does anyone know what the change in modulus of spring steel vs temp might >be ? > >Regards, > Barry > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Barometric floats and flat springs Date: Sun, 25 Oct 1998 15:07:14 -0800 Brett After I posted the question I went back to my college books and found a reference in Elements of Material Science by Van Vlack, Addison Wesley 1966. He references: A.G.Guy,Elements of Physical Metallurgy, Addison Wessley 1959. The graph shows the modulus of iron,copper,& aluminum vs temp. The approx slope for iron is -0.007E6/degree C. This is more than what Robert had said (- .000240/degree C.). You might try to calculate the position change with both to see. Regards Barry Brett Nordgren wrote: > Barry, > > The only number I've ever seen was one Bob Barns quoted from a book, that > he posted last Wednesday. > Since E itself is very similar among different varieties of steel, it > wouldn't surprise me if the tempco of E was also pretty similar. > > >From R. Barns: > > > The following quote is from "The > >Science of Clocks & Watches" by AL Rawlings, 3rd., ed., 1993. (Fascinating > >reading for those interested in mechanical devices.).............. > ........................... > > "But E for steel also varies with temp., for the material becomes more > >yielding as it gets warmer. It has been found that at normal temps. E > >decreases about 240 ppm/deg C. This will make the period of vibration > >longer and the watch will lose from the effect of heat on the hairspring." > ......................... > > If anyone comes up with a good source on the subject, I would be very > interested, too > > Regards, > > Brett > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Barometric floats and flat springs Date: Sun, 25 Oct 1998 19:00:52 -0500 Barry, As I calculate it -0.007E6 per degree C out of 29E6 (typical value of E for steel) is roughly -241 ppm/degree C. That's close enough to Bob's number for me. Data point #2! Brett At 03:07 PM 10/25/98 -0800, you wrote: >Brett > After I posted the question I went back to my college books and found a >reference in Elements of Material Science by Van Vlack, Addison Wesley 1966. He >references: A.G.Guy,Elements of Physical Metallurgy, Addison Wessley 1959. The >graph shows the modulus of iron,copper,& aluminum vs temp. The approx slope for >iron is -0.007E6/degree C. This is more than what Robert had said (- >.000240/degree >C.). You might try to calculate the position change with both to see. > Regards _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Bridge Amp/Demodulator Question Date: Sun, 25 Oct 1998 20:45:16 -0500 Sean I have just printed out your modified bridge amplifier/demodulator circuit. I have one question. It is in the area of opamps A2 and A3. Am I right to assume that the inputs to these opamps (via 10K resistors) come from each phase of the output transformer located in the oscillator circuit? -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Barometric floats and flat springs Date: Sun, 25 Oct 1998 17:50:42 -0800 Brett I appreciate the clarification on how Bob was representating the change in E w/ temp. I reviewed your spring files and came up with the following: Using the STM8 operating point line in your STM-8 spring analysis table as a start. If we now keep the force the same (assuming gravity doesn't change) and vary K**2 to take into account a change of E(so I don't have to calculate the integral). I then interpolated to find a new gap opening for a change in K**2 equal 29.007/29. I came up with a gap change of 0.0035"/degree C or a force of 0.55 gms to return the spring to the original position. Seems reasonable Sean Thomas. regards Barry Brett Nordgren wrote: > Barry, > > As I calculate it -0.007E6 per degree C out of 29E6 (typical value of E for > steel) is roughly -241 ppm/degree C. That's close enough to Bob's number > for me. Data point #2! > > Brett > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: Bridge Amp/Demodulator Question Date: Mon, 26 Oct 1998 19:48:30 -0600 (CST) Rex, That is correct. The references to pin 6 and pin 7 at the input to the switch drivers is the same as shown at the left of the drawing, with ph (phase) 1 and phase 2, which are the two outputs of the transformer of the oscillator. Connected this way eliminates the phase jitter of the previous cascaded amplifiers/inverter. There are still a few minor adaptations for a VRDT rather than a tiltmeter, like the calibrate resistors: I need to come up with an estimate, which will be something like 3 ohms = 4 microns. The secondary gain loops of A1 and A5 (the variable resistor) do not seem to be necessary with the VRDT. The gain of A6 is set with 2.2megs in the feedback to about 5.5 to get 250 millivolts/micron. I also just re-scanned the two drawings, using the "B&W drawing" settings rather than the B&W photo mode, which produced a rather poor result last Friday. You should find them more readable. Also, regarding the noise study, I found that to push it below the 1 nanometer level (from 10 hz to 10 seconds), a good shielded box is necessary around the electronics, as well as a very clean +,- 9V DC power supply. I substituted a pair of 9-volt batteries to evaluate the power supply noise by comparison. regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Clark Wockner Subject: neis quake notice Date: Mon, 26 Oct 1998 20:20:36 -0600 HI All: Has anyone gotten a notice from the NEIC lately. I think I may have been dropped from the list server. Clark _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Seisguy@....... Subject: Re: neis quake notice Date: Mon, 26 Oct 1998 21:28:16 EST The last one I got was for the M3.3 Virginia event last week. Mike _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: Re: neis quake notice Date: Tue, 27 Oct 1998 00:52:18 -0600 (CST) Someone turned off the teleseisms, unless Meredith's Inter-Gallactic Seismometer is channeling them into his mega-magnetic drive and is going to release them all on halloween. In the mean time, NEIS hasn't had much to report. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Dataq Instruments free software update Date: Mon, 26 Oct 1998 23:04:37 -0800 (PST) Dataq Instruments www.dataq.com has just issued an update to its free WinDaq/Lite waveform acquisition, recording, analysis software. The update includes the capability to trigger waveform recording at a specified level, and to continue recording for a specified time or number of samples after the trigger event has occurred. ie. record for one hour after an event is triggered for example, and then stop recording until the next event is triggered. This trigger/record feature can be used with the DI-150RS serial port A/D module that is available as an Internet special for 49.95. (same as the Radio Shack model which sells for 99.99). The nice thing about this system is that it is powered from the serial port, has adjustable gain of 1 or 100, 2 channels, and is sensitive to millivolt or below signals. I hooked it up directly to my simple vertical sensor (5000 ft of magnet wire wound around a plastic peanut butter jar, a 20 oz speaker magnet suspended inside the jar from a spring-1.5 sec mechanical period- and damped by covering the magnet with antifreeze.) It can detect footsteps 20 ft away without using an external amplifier. The sensor puts out more than +- .7 volts if I move the magnet by hand. The WinDaq software (Win95/98/3.1/NT versions) displays data acquisition continuously in real time, while recording or not, and the recorded file can be reviewed in real time. Nice feature since only one computer and one program running is needed. You can keep the computer and acquisition program running continuously and turn off the monitor when not using it. This module uses a Pic 16C54A-04/P Microcontroller and has a 12 bit A/D for conversion. Overall its a great system for getting started in earthquake data recording and the price is right especially with the new triggered feature. Greg Bajuk _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Dataq Instruments free software update Date: Tue, 27 Oct 1998 17:32:13 +0000 Gregory Bajuk wrote: > This trigger/record feature can be used with the DI-150RS serial port > A/D module that is available as an Internet special for 49.95. (same as > the Radio Shack model which sells for 99.99). When I called them to order the Internet Special, the salesman said that the model number is the DI-150SP. The DI-150RS is still about $100. The difference is the DI-150SP has some kind of offset or drift problem at the highest internal gain setting. Maybe he was wrong if you're having such good results? I already bought Larry's 16-bit board anyway. Speaking of buying stuff... I've got someone hunting for geophones right now. He found some used untested 4.5 Hz models for about $25. Probably not including shipping. Let me know if you're interested and I can return his address. I have him looking for lower frequency models right now. I have my 10 Hz geophone hitched up without an amp or filter and the noise is huge. Here's an odd bit. I put the geophone on top of the SDR computer and the noise was lower than when I put it on my old Lehman prototype base. The base has long wood screws that go into the carpet a lot more than the flat bottom of the running computer. You'd think that the computer would be a lot noisier. Also when the geophone was on top of the computer you could see what was happening in the room a lot better. Now it doesn't show up or is buried in noise? The next step is trying it out on the tile floor. Then I'll need to buy an amp/filter. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian Smith Subject: Re: Dataq Instruments free software update Date: Tue, 27 Oct 1998 08:21:12 -1000 Hi, I'm looking for a couple of geophones, I'd appreciate the info on them. Thanks Ian Smith > Speaking of buying stuff... I've got someone hunting for geophones right > now. He found some used untested 4.5 Hz models for about $25. Probably > not including shipping. Let me know if you're interested and I can > return his address. I have him looking for lower frequency models right > now. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian Smith Subject: Re: Dataq Instruments free software update Date: Tue, 27 Oct 1998 08:49:03 -1000 Greg wrote: > I have my 10 Hz geophone hitched up without an amp or filter and the > noise is huge. Here's an odd bit. I put the geophone on top of the SDR > computer and the noise was lower than when I put it on my old Lehman > prototype base. The base has long wood screws that go into the carpet a > lot more than the flat bottom of the running computer. You'd think that > the computer would be a lot noisier. Also when the geophone was on top > of the computer you could see what was happening in the room a lot > better. Now it doesn't show up or is buried in noise? The next step is > trying it out on the tile floor. Then I'll need to buy an amp/filter. I had a similar experience. Not being an expert in emf etc I didn't solve it, but it seemed to me that the metal base of the seismograph was acting as an attenna. I encased the sensor lead in a Faraday cage (cooke box and aluminium foil!), and that made it worse! Perhaps there is an emf expert in our midst who could explain? cheers Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Re: Dataq Instruments free software update Date: Tue, 27 Oct 1998 16:53:24 -0800 (PST) Not True. The internet special delivers the DI-150RS module. When you click on the internet special (which says DI-150SP) the page that comes up shows the DI-150RS information. When talking to the sales rep he verified that I would be getting the RS model if I ordered it. I put in an order and received the RS model. Greg Bajuk On Tue, 27 Oct 1998, Greg wrote: > Gregory Bajuk wrote: > > > This trigger/record feature can be used with the DI-150RS serial port > > A/D module that is available as an Internet special for 49.95. (same as > > the Radio Shack model which sells for 99.99). > > When I called them to order the Internet Special, the salesman said that > the model number is the DI-150SP. The DI-150RS is still about $100. The > difference is the DI-150SP has some kind of offset or drift problem at > the highest internal gain setting. Maybe he was wrong if you're having > such good results? > > I already bought Larry's 16-bit board anyway. > > Speaking of buying stuff... I've got someone hunting for geophones right > now. He found some used untested 4.5 Hz models for about $25. Probably > not including shipping. Let me know if you're interested and I can > return his address. I have him looking for lower frequency models right > now. > > I have my 10 Hz geophone hitched up without an amp or filter and the > noise is huge. Here's an odd bit. I put the geophone on top of the SDR > computer and the noise was lower than when I put it on my old Lehman > prototype base. The base has long wood screws that go into the carpet a > lot more than the flat bottom of the running computer. You'd think that > the computer would be a lot noisier. Also when the geophone was on top > of the computer you could see what was happening in the room a lot > better. Now it doesn't show up or is buried in noise? The next step is > trying it out on the tile floor. Then I'll need to buy an amp/filter. > > ,Greg > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: VBB Oscillator Circuit Date: Tue, 27 Oct 1998 18:15:50 -0700 Rex- Did you record, feel, or otherwise sense the Pymatuning EQ? Where is Bowling Green, OH? (and where is Ed the Cat?) -Edward Rex Klopfenstein, Jr. wrote: > I have just posted my revised circuits of Sean Morrissey's circuit on on > my web page. I have wired it as shown and it appears to work. > > -- > Rex Klopfenstein, Jr. > Bowling Green, OH > rklopfen@......... > http://www.wcnet.org/~rklopfen > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Doug Crice Subject: Re: Dataq Instruments free software update Date: Tue, 27 Oct 1998 13:26:50 -0800 Geophones with natural frequencies lower than say 20 Hz only work properly when they are right side up (depending on which way is up for a particular geophone). If you turn one sideways, they still work but the signal is a lot smaller (and lacks the low frequencies) -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: AGU Participation of HIGH SCHOOL STUDENTS at AGU meetings Date: Tue, 27 Oct 1998 18:40:18 -0700 Catherine- I think that if AGU wants to send the message to high school students that they should check out the Earth sciences, then it does not make sense to charge these students so much to attend and participate in an AGU meeting that they have to first either get an NSF grant or sell dope on the side to support their science habit. Do you have any advice about how else we can convince AGU to allow high school students to attend and participate in AGU meetings at a price they can afford? I, for one, would be willing to make a special contribution in my annual AGU dues for high school students, much as we already do with AGU support for minorities. -Edward > Subject: > Re: I know you're there > Date: > Tue, 27 Oct 1998 08:41:44 -0800 (PST) > From: > Ted Blank > To: > Edward Cranswick > > > > > Hi, yes here in spirit...we are just starting a "Quake Trackers" club at > the school. 10 kids signed up, so I would expect that about half of them > would be interested in the poster session. The teacher is very > supportive, at least that's a plus. However he's been very busy, and a > friend has been in the hospital so it's been pretty crazy. I read your > notes about joining the AGU and then registering. What would that mean > in terms of $$$ for the kids? $300 was just unthinkable. Thanks. > > > Ted Blank > San Jose, California > > On Sat, 24 Oct 1998, Edward Cranswick wrote: > > > Ted- > > What is the staus of your PSN presentation? How many students do you > > anticipate will participate? > > -Edward > > > > -- > > Edward Cranswick Tel: 303-273-8609 > > US Geological Survey, MS 966 Fax: 303-273-8600 > > PO Box 25046, Federal Center cranswick@........ > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > > > > Catherine Johnson wrote: > Dear Ed, > > Here's the reply from AGU. The most $-effective option > is for the students to become AGU members and then they > can register as undergrads. Please let me know the names > of people who will be doing this so that I can pass the > info onto Frank Ireton at AGU in case there are any problems. > > Best regards, > > Catherine > > >From: FIreton@....... > >Date: Wed, 21 Oct 1998 09:49 -0400 (EDT) > >Subject: Students at the AGU meeting. > >To: catherine@........ > >MIME-version: 1.0 > >Status: > > > > Catherine, > > > > Sorry for the delay getting back to you. We had to get approval from > > Fred. He said that if they will join AGU they can register as > > undergraduate students. That will be a significant saving over > > member's registration prices. That information can be found on the AGU > > home page. Please keep me posted on the outcome. > > > > Frank > > > > ----------------------------------------- > Dr. Catherine Johnson > Education and Outreach Program Manager > IRIS > 1200, New York Ave., #800 > Washington DC 20005 > > Tel: (202) 682 2220 > Fax: (202) 682 2444 > Email: catherine@........ > Web: http://www.iris.washington.edu/EandO > Personal web page: http://magellan.ciw.edu > ----------------------------------------- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: geophone sensitivity Date: Tue, 27 Oct 1998 19:55:53 -0600 (CST) Most geophones are made in both vertical and horizontal configurations; the difference being in how the upper suspension is configured. You can sometimes find an H stamped on the case of a horizontal. You can also tell which is which by shaking it and listening for the coil to hit the stops. A vertical will hit both stops as it is shaken vertically along the axis of the instrument; obviously a horizontal needs to be moved horizontally for the same effect. As the frequency response is increased, the geophone is much more tolerant of tilt, as Doug pointed out. For the Geospace HS series, all the phones above 15 hz can operate with 90 degrees of tilt, while the 4.5 hz has a max of 15deg, and the 10hz has a max of 30deg.. For longer periods, like the 1hz L4-C, the tilt angle directly affects the natural period. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: VBB Oscillator Circuit Date: Tue, 27 Oct 1998 21:34:59 -0500 I don't know of anybody that felt the quake in the Bowling Green area. Several people I know who work in Toledo (about 20 miles north) felt the quake. They also work in large building that most likely amplified the tremor. Over the years I can't remember feeling the one or two large (for Ohio) quakes. Maybe this is because we are located in an old swamp (Black Swamp) that was formed when the glacier retreated. The old swamp was filled with gravel retreating glacier and later with sand from an ancient lake. Ed the Cat is an old, overweight cat whose only goal in life is to sleep and eat! About the only thing in nature that gets his attention is when a thunderstorm approaches, he's under the bed for the duration!! Edward Cranswick wrote: > Did you record, feel, or otherwise sense the Pymatuning EQ? Where is > Bowling Green, OH? (and where is Ed the Cat?) > -Edward -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: High school student participation at AGU Date: Tue, 27 Oct 1998 20:24:32 -0700 CARRJJ- Would you please tell me the URL of that NASA website. Thank you. -Edward CARRJJ@....... wrote: > There is also Project Inspire for high school student. It hunts for spherics > and whistlers (natural radio signals). Bill Pine at Chaffey High School in > Ontario, CA is the director. They can be found on the NASA web site. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: Dataq Instruments free software update Date: Tue, 27 Oct 1998 20:10:11 At 11:04 PM 10/26/98 -0800, you wrote: >Dataq Instruments www.dataq.com has just issued an update to >its free WinDaq/Lite waveform acquisition, recording, analysis software. >The update includes the capability to trigger waveform recording at a >specified level, and to continue recording for a specified time or number >of samples after the trigger event has occurred. ie. record for one hour >after an event is triggered for example, and then stop recording until the >next event is triggered. Greg I and another fellow over hear near sacramento has been using the di-150rs for some time now and I did send a message to windaq about adding this feature to the software. They came through rather quickly with the added change. Now my question is, how do you get it to record. I downloaded the new software and installed it and it works like the old one did. I checked trigger storage but it doesn't ask for a file name. I turned on recording but it seems to record all the time just as it did before. Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: geophone sensitivity Date: Wed, 28 Oct 1998 06:49:29 EST Hi All, The vertical geophone is much more tolerant of tilt than the horizonial phones are. As phones are tilted, the coil does not rest in the center of its travel area and the output becomes less linear. I have a patent on using two vertical geophones placed 45 degrees from vertical in opposite directions, that is 90 degrees from each other. By adding these geophone outputs, one gets vertical traveling waves. Subtract one from the other one gets H (Shear) waves. I think there is an error in the statement below. Tilting a vertical geophone 90 degrees will not work as the coil will be hitting the top stop when at rest. Same with tilting a horizontal phone 90 degrees, the coil will rest on the stop. In a message dated 10/27/98 5:57:33 PM Pacific Standard Time, sean@........... writes: << As the frequency response is increased, the geophone is much more tolerant of tilt, as Doug pointed out. For the Geospace HS series, all the phones above 15 hz can operate with 90 degrees of tilt, while the 4.5 hz has a max of 15deg, and the 10hz has a max of 30deg.. >> George Erich Seismic Exploration Consultant P. O. Box 2011, Norwalk, CA 90650, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Jim Hannon Subject: Re: High school student participation at AGU Date: Wed, 28 Oct 1998 06:08:14 -0600 Edward Cranswick wrote: > > CARRJJ- > Would you please tell me the URL of that NASA website. > Thank you. > -Edward > http://ssdoo.gsfc.nasa.gov/education/inspire/inspire.html Is the Inspire site. -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: New web site - Leaf springs, etc. Date: Wed, 28 Oct 1998 10:20:27 -0500 To all, I've been slowly proceeding with some more number-crunching on the STM-8 and on feedback instruments in general. Have made a somewhat improved version of the leaf-spring analysis spreadsheet, as well as some other stuff. To simplify the process of sharing these files, I've put up a very small, relatively private, Web site from which you can review or download my files, at: http://members.home.net/nordgren/public/ Downloads are via your Web browser's file-transfer system. Direct anonymous ftp doesn't appear to be allowed. I am hoping that by sharing some of this work, I'll be able to discover my errors more quickly and perhaps get some new ideas. Please let me know where you think there are problems, either with the data or with the Web page. Many of the files are in .pdf form. If .rtf is better, please let me know and I'll add that where I can. Since I am hoping to update this every few days, if you're interested, please check back often. Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 09:11:45 -0700 (MST) I just ordered the Dataq DI-150SP and the salesman said that this unit had a larger offset (drift?) than the DI-150RS unit. In all other respects it is the same and will run the same software. For my needs for a "table-top seismology demo" I don't expect that the offset will not be a problem. JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: geophone tilting Date: Wed, 28 Oct 1998 11:38:59 -0600 (CST) George: Re: tilting geophones: The statements I posted are correct, since the data was taken directly from the data sheet for the Geospace HS-1-LT geophones. We are using these phones for a number of experiments to broaden the response. I could scan the sheet, but it would not be legible. Of course the specs are different for Mark Products and others, and I have not dug them out. It can be observed that as the natural period of the geophone is made shorter or the frequency higher, like greater than than 15 hz, the suspension becomes more rigid or less compliant, so the change in force from gravity on the suspension from vertical to horizontal is not enough to cause the coil to travel to its stops. Conversely, a longer period or lower frequency phone has a very "soft" or compliant suspension, and the coil will travel to the stops with little change in the amount of g that results from tilting. For a horizontal phone, the tilt tolerance is much less than for the vertical because of this, as would be expected. Reading from the data sheet: the maximum tilt angle for a 4.5hz vertical is 15deg, horizontal is +,- 2.5deg; at 7.5hz: vertical 20deg, horiz: +,- 3.5deg; 10hz: vertical 30deg; horiz: +,- 7.5 deg. For the 15, 20,and 28hz geophones, the maximum tilt for "All Models" (quoting the sheet) is "+,- 90 degrees". Perhaps you have not seen of these specifications. I can mail a copy. These LT (long travel) phones have a minimum peak-peak travel of 5.1mm. This applies to all the models. OF course, other phones will have different specifications, so the user should be aware of them. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 10:03:22 -0800 (PST) John, let us know if you receive the SP or RS version. I ordered the internet special (SP was on the web site) but when I talked to the salesman I pointed out that the information page about the SP showed the information on the RS module, and told him I wanted the RS module since that is what they advertised. They sent me the RS module. By the way you can null offset thru software. connect a jumper wire between Ch1 and ground and then do a low cal on that channel setting that to 0.00 volts. Do the same to Ch2. Save the settings as Default in the Edit menu. Greg Bajuk On Wed, 28 Oct 1998, John Lahr wrote: > > I just ordered the Dataq DI-150SP and the salesman said that this > unit had a larger offset (drift?) than the DI-150RS unit. In all > other respects it is the same and will run the same software. For > my needs for a "table-top seismology demo" I don't expect that the > offset will not be a problem. > > JCLahr > ################################## John C. Lahr > ################################# Seismologist > ################################ U.S. Geological Survey > ############################### Geologic Hazards Team, MS966 > ############################## PO Box 25046 > #############################/############################## > ############################/############################### > Denver, Colorado 80225-0046 ################################ > Phone: (303) 273-8596 ################################## > Fax: (303) 273-8600 ################################### > lahr@........ ##################################### > http://giseis.alaska.edu/lahr > http://lahr.org/john-jan > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: New web site - Leaf springs, etc. Date: Wed, 28 Oct 1998 10:27:24 -0800 Brett -- Very concise, detailed analysis of feedback systems. Thank you for generating and posting it. Since you've asked for comments, I have a couple of very minor ones regarding the following paragraph taken from your feedback-systems analysis: You wrote: >>>> Physical considerations dictate that as frequency is increased, a frequency will eventually be reached where the magnitude of the loop gain A(s)B(s) has fallen to unity. That frequency is called the gain-crossover frequency. If, at the gain-crossover frequency, the phase shift in A(s)B(s) has lagged by 180 deg (or more) from the initial 180 deg. associated with the negative polarity of the feedback, the system will oscillate. <<<< I like to express one of the points slightly differently: If the phase shift of the feedback reaches 180 degrees while the loop gain is above unity, the system will oscillate. Also, the system will oscillate at 180 degrees of either leading or lagging phase shift. Thank you for doing all this work. I am very anxious to see what you come up with regarding the STM-8 feedback system. I am particularly curious how the various terms of the equation are derived, with respect to the hardware. A more thorough understanding of the relationship of the hardware and feedback equations will help those of us who don't have ideal VBB hardware and would like to adjust things to try to make the equations work with what we have. Thanks again, Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Doug Crice Subject: Re: geophone sensitivity Date: Wed, 28 Oct 1998 08:18:41 -0800 Sean is correct, sensitivity to tilt is a function of natural frequency. To get geophones to resonate at higher frequencies, you make the springs stiff. When you make the springs stronger, they can hold up the mass better against gravity. While there are non-linearities related to getting the moving coil off center, the real change comes when the coil runs up against the mechanical stops. Geophones with a high resonant frequency will even operate upside down. Low frequency geophones have soft springs, because relatively low restoring force is part of the natural frequency equation. They bottom out with small amounts of tilt. -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 10:34:08 -0800 For what it's worth, I ordered the "Internet Special" from Dataq Instruments about three weeks ago and got the DI-150RS model. Haven't done any temperature testing, but it doesn't seem to drift much just sitting on the bench. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... At 10:03 AM 10/28/98 -0800, Greg Bajuk wrote: >John, let us know if you receive the SP or RS version. I ordered the >internet special (SP was on the web site) but when I talked to the >salesman I pointed out that the information page about the SP showed the >information on the RS module, and told him I wanted the RS module since >that is what they advertised. They sent me the RS module. By the way you >can null offset thru software. connect a jumper wire between Ch1 and >ground and then do a low cal on that channel setting that to 0.00 volts. >Do the same to Ch2. Save the settings as Default in the Edit menu. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 10:48:13 -0800 (PST) Norman, first you might check to see that you downloaded the right version as the DATAQ web site has a couple of places which list software for download. Once on the home page www.dataq.com select Software Updates, then go down thru the table of software list to the entry- WinDaq/Lite(including WWB) 11 Sep 98- and download this file. When you are initially setting up a channel for recording (Set-Up) mode you select several parameters such as Channel, sample rate, low and high cal, Channel gain and measurement range, and selecting, Option, enable trigger mode(then set trigger levels and number of post trigger samples-set enough post trigger samples to correspond to a time. ie maybe a half-hour to an hour to insure you will record the whole event) Next go to File, and choose set as Default. This saves all your Set-up information as default and prevents you from recording a channel using some previous Set-up settings. Now before recording open a NEW file and then choose Record from the File menu. The Record mode will be displayed at the bottom of the screen and have an asterisk next to it. When the trigger level is exceeded the asterick will disappear and recording to disk starts. Recording will continue as long as the number of samples(time) you selected when setting up the trigger mode. I used the thermocouple input to test the trigger level feature. Once the file is recorded it can be reviewed and manipulated using the Dataq waveform browser software. Also file exporting to disk allows nine diferent modes( including ASCII, binary, spreadsheet, ASYST, DADiSP,CALC, NSoft Dac). I hope one of these formats can be easily converted for use in Larry Cockrane' PSN event format so that these files can be used with WINQuake. Also, I will keep working with DATAQ to see if they can expand the trigger features to be more like that available in SDR. Perhaps those on the list who have DATAQ products could do the same. Greg Bajuk On Tue, 27 Oct 1998, Norman Davis WB6SHI wrote: > At 11:04 PM 10/26/98 -0800, you wrote: > >Dataq Instruments www.dataq.com has just issued an update to > >its free WinDaq/Lite waveform acquisition, recording, analysis software. > >The update includes the capability to trigger waveform recording at a > >specified level, and to continue recording for a specified time or number > >of samples after the trigger event has occurred. ie. record for one hour > >after an event is triggered for example, and then stop recording until the > >next event is triggered. > > Greg > I and another fellow over hear near sacramento has been using the > di-150rs for some time now and I did send a message to windaq about adding > this feature to the software. They came through rather quickly with the > added change. Now my question is, how do you get it to record. I downloaded > the new software and installed it and it works like the old one did. I > checked trigger storage but it doesn't ask for a file name. I turned on > recording but it seems to record all the time just as it did before. > > > Norman Davis WB6SHI > Shingle Springs, Ca > normd@............. > http://www.directcon.net/normd/index.htm > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: New web site - Leaf springs, etc. Date: Wed, 28 Oct 1998 14:06:54 -0500 Karl, Many thanks for the kind comments and suggestions. > >I like to express one of the points slightly differently: If the phase >shift of the feedback reaches 180 degrees while the loop gain is above >unity, the system will oscillate. Let me think about this one. I'm going to try to find a counter-example of such a loop that is stable. (if I can) > >Also, the system will oscillate at 180 degrees of either leading or lagging >phase shift. > I absolutely agree. I'm just used to working with loops where you're fighting the lagging phase due to a loop gain function that falls with rising frequency. Brett _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Re: Dataq Instruments SP vs RS Date: Wed, 28 Oct 1998 12:22:54 -0700 (MST) I just spoke to John at Dataq about the SP vs RS confusion. Apparently they only make one model, which is labeled DI-150RS. If the unit has more than 30 mv offset on the 100 mv range, then it is sold for half price as a DI-150SP (without changing the labeling etc.) JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 14:38:33 -0700 DataQ Enthusiasts- In late 1993 or early 1994, about the time of the Northridge EQ, I purchased a "sample" DataQ A/D board and software for $50. It was 12-bit, single channel, and connected to the serial port. I believe (or maybe to the parallel port). Tom Bice here at USGS, Golden, rigged up a nice little pre-amp for it and the necessary cabling, etc., to connect it to a 4.5 Hz vertical geophone. Altogether, with its software, it worked very nicely, displaying traces in realtime in either DOS or Windows 3.1 and recording timeseries to a disk file, but I don't believe it had an trigger capability. Steve Hammond and I were going to use it as part of our PSN/highschool project, and I demonstrated it and left it with him in August 1994. However, what with the demands of the Northridge EQ study and the vicissitudes of the Silicon Valley economy and public school system, we never got further with the project. However, it was a simple and straightforward piece of hardware/software that worked well, and the recent correspondence about DataQ reminded me of it. -Edward Gregory Bajuk wrote: > Dataq Instruments www.dataq.com has just issued an update to > its free WinDaq/Lite waveform acquisition, recording, analysis software. > The update includes the capability to trigger waveform recording at a > specified level, and to continue recording for a specified time or number > of samples after the trigger event has occurred. ie. record for one hour > after an event is triggered for example, and then stop recording until the > next event is triggered. > > This trigger/record feature can be used with the DI-150RS serial port > A/D module that is available as an Internet special for 49.95. (same as > the Radio Shack model which sells for 99.99). > > The nice thing about this system is that it is powered from the serial > port, has adjustable gain of 1 or 100, 2 channels, and is sensitive to > millivolt or below signals. I hooked it up directly to my simple vertical > sensor (5000 ft of magnet wire wound around a plastic peanut butter jar, a > 20 oz speaker magnet suspended inside the jar from a spring-1.5 sec > mechanical period- and damped by covering the magnet with antifreeze.) It > can detect footsteps 20 ft away without using an external amplifier. The > sensor puts out more than +- .7 volts if I move the magnet by > hand. > > The WinDaq software (Win95/98/3.1/NT versions) displays data acquisition > continuously in real time, while recording or not, and the recorded file > can be reviewed in real time. Nice feature since only one computer and > one program running is needed. You can keep the computer and acquisition > program running continuously and turn off the monitor when not using it. > > This module uses a Pic 16C54A-04/P Microcontroller and has a 12 bit A/D > for conversion. > > Overall its a great system for getting started in earthquake data > recording and the price is right especially with the new triggered > feature. > > Greg Bajuk > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Francesco" Subject: EVENT IT'S COMING Date: Wed, 28 Oct 1998 22:45:26 +0100 LARGE SURFACE WAVE IT'S COMING NOW - NO P START HERE AT 22.39 SOMEONE HAVE THE SAME REGISTRATION? I.E.S.N. PSN ITALY STATION: OSIMO, 43.290N 13.294E FRANCESCO
LARGE SURFACE WAVE IT'S COMING = NOW  - =20 NO P
START HERE  AT = 22.39
SOMEONE HAVE THE SAME=20 REGISTRATION? 
 
I.E.S.N. PSN ITALY
STATION:  OSIMO,  43.290N  = 13.294E
 
FRANCESCO
From: "Francesco" Subject: EVENT IN PROGRESS Date: Wed, 28 Oct 1998 23:04:03 +0100 22.38 UTC M ~4 LOC: BALKAN REGION I.E.S.N. PSN ITALY
22.38  UTC
M ~4
LOC: BALKAN REGION
 
I.E.S.N.   PSN = ITALY
From: johnccole@........ (john c cole) Subject: Re: EVENT IN PROGRESS Date: Wed, 28 Oct 1998 20:22:36 -0600 What is the latitude and longitude of the Balkan ? quake recorded at 22:38 UTC 28/10/98 ? Event recorded in Pearland, Texas at ~5:38 PM local time. ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866] _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 18:43:53 At 10:48 AM 10/28/98 -0800, you wrote: >Norman, first you might check to see that you downloaded the right version >as the DATAQ web site has a couple of places which list software for >download. Once on the home page www.dataq.com select Software >Updates, then go down thru the table of software list to the entry- >WinDaq/Lite(including WWB) 11 Sep 98- and download this file. Ok did this. >When you are initially setting up a channel for recording (Set-Up) mode >you select several parameters such as Channel, sample rate, low and high >cal, Channel gain and measurement range, and selecting, Option, enable >trigger mode(then set trigger levels and number of post trigger I can't find a "trigger mode". I see the refference to trigger mode in the help screens but don't see it in the options. I see trigger storage but no trigger mode. >samples-set enough post trigger samples to correspond to a time. ie maybe >a half-hour to an hour to insure you will record the whole event) I see that when I have the trigger storage checked. > >Next go to File, and choose set as Default. This saves all your Set-up >information as default and prevents you from recording a channel using >some previous Set-up settings. Now before recording open a NEW file and >then choose Record from the File menu. The Record mode will be displayed >at the bottom of the screen and have an asterisk next to it. When the >trigger level is exceeded the asterick will disappear and recording to >disk starts. Recording will continue as long as the number of >samples(time) you selected when setting up the trigger mode. I see the record on the bottom but no asterisk next to it. I have the trigger set at one volt and the input is will below that. I would think that would be high enough to keep it from triggering. could you send me one of your recorded files and I will load as a reference file and see how you have yours set. Norm Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: johnccole@........ (john c cole) Subject: Re: EVENT IN PROGRESS Date: Wed, 28 Oct 1998 20:43:23 -0600 Francesco, I recorded the same seismic event as you recorded at approximately the same time. I do not have my AD card installed in my computer as of yet. When I do I will have accurate time. apparently we are the only two to record the event so far. My latitude and longitude is 29,33',14"N 95,33',47"W. Let me know what else that you find. John C. Cole ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866] _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: AGU Participation of HIGH SCHOOL STUDENTS at AGU meetings Date: Wed, 28 Oct 1998 20:45:27 -0700 Catherine- I thank you very much for your thorough and comprehensive response to my question about fees for high school students to attend the December AGU meeting. There was confusion in my mind and the minds of some PSN members about what the price is, and you have cleared that up. I think that $22 per student is a good deal in the short-term, and I will push to have the students register ASAP, i.e., before the Nov 6 deadline. I look foward to further developments in AGU programs for high school students. I thank you very much again for your charming and effective assistance in clearing this matter up, even if much of the diffficulty was my own confusion. -Edward Catherine Johnson wrote: > Hi Edward, > > OK, maybe there is some confusion regarding the per student cost > for attending AGU. The annual membership fee for a student (they will > need a signature from a teacher at their school) is $7. > I understood the email from Frank Ireton to read that Fred Spilhaus > says that if the kids join AGU as students (thereby receiving weekly > EOS and monthly Physics today - probably enough to make them > go sell dope and not be Earth Scientists anyway!) they can > register for the AGU meeting as undergrad students. The pre-registration > deadline is Nov 6. Before Nov 6 the cost is $15 for one day, $30 for more > than 1 day; after Nov 6 these #s are $25 and $40 respectively. > So the total per kid cost could be as low as $22 (1-day only at > meeting and register before end of next week) or as high as $47 (more > than 1 day at meeting and register after Nov 6). I'd have > thought 1 day at the meeting is enough (it is for me!!!!)? > > So total for 10 kids is $220. > > Maybe this is what Ted figured but it seemed to me from the > emails that maybe he thought it was hundreds of $s per child? > > Fortunately I have so far led a life shielded from the inner > workings of AGU (until a couple of weeks ago when I first > went to an AGU committee meeting). I can tell you from my > limited experience that $22/person is in AGU's eyes a "deal". > I know that Frank Ireton and others have pushed for a long > time to get even the undergrad registration fee approved. > Outreach and education below the college level is starting > to take off but it will still be some time before there > is a groundswell of support within predominantly research > depts and therefore within AGU for it. There are some tremendous > individuals working really hard for this to happen and it > will but it takes time. The real issue within the research > community is there is NO appreciation of the lack of funds > available at the K-12 level. To the research community > $220 for 10 kids is a give-away, they have no understanding > of how difficult it is to raise even a couple of hundred > dollars for a class project / trip / whatever. You probably > know all this anyway, and I'm not endorsing it, just trying > to explain why I think things will change but will take > time. > > I'll definitely promote your idea of membership fees for > scientists including a small amount that would support > high school students attending AGU meetings or such like. > I think that's a good idea and I'll bring it up at the > next committee meeting I have to go to (Committee on Education > and Human Resources-CEHR). > > Can you let me know whether there was confusion regarding the > per child $ amount or not, and whether the $s are still too > much? I can't do anything about it that would make any > difference for this year, and as a single individual I > probably can't change the inner crankings of AGU anyway but > I can at least get the CEHR committee to talk about it and make > a recommendation for the future. > > Best regards, > Catherine > > ----------------------------------------- > Dr. Catherine Johnson > Education and Outreach Program Manager > IRIS > 1200, New York Ave., #800 > Washington DC 20005 > > Tel: (202) 682 2220 > Fax: (202) 682 2444 > Email: catherine@........ > Web: http://www.iris.washington.edu/EandO > Personal web page: http://magellan.ciw.edu > ----------------------------------------- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Registering the students Date: Wed, 28 Oct 1998 22:33:05 -0700 Ted & Jan- Catherine Johnson of IRIS has straightened me out (see excerpt of email from her below) about what is involved for the students to participate in the poster that you and Jan will present (U42A-27: "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum") at the San Francisco AGU meeting at 1:30 PM on Thursday afternoon on 10 December. Please email me a list of the students who will participate in your poster presentation as soon as possible, preferably tomorrow and definitely by Friday. Each student must fill out three hardcopy forms -- 1) registration; 2) membership application; 3) student certification -- that are available from the Web: http://earth.agu.org/meetings/fm98rgpr.html http://earth.agu.org/inside/memprintable.html http://earth.agu.org/inside/memapprove.html and which must also be signed by a teacher and then be faxed to AGU accompanied by payment of the fees. If the students have their registration forms completed and submitted by the Nov 6 deadline, I will pay the registration fee of $22 per student with my American Express card (I hope I can solve the problem of having to sign each form) -- if the there is a delay and we must pay the higher rate of $32, everything will become much more involved and problematic. I hope that your situation has calmed down a bit. Please let me know that you have received this email. -Edward > OK, maybe there is some confusion regarding the per student cost > for attending AGU. The annual membership fee for a student (they will > need a signature from a teacher at their school) is $7. > I understood the email from Frank Ireton to read that Fred Spilhaus > says that if the kids join AGU as students (thereby receiving weekly > EOS and monthly Physics today - probably enough to make them > go sell dope and not be Earth Scientists anyway!) they can > register for the AGU meeting as undergrad students. The pre-registration > deadline is Nov 6. Before Nov 6 the cost is $15 for one day, $30 for more > than 1 day; after Nov 6 these #s are $25 and $40 respectively. > So the total per kid cost could be as low as $22 (1-day only at > meeting and register before end of next week) or as high as $47 (more > than 1 day at meeting and register after Nov 6). I'd have > thought 1 day at the meeting is enough (it is for me!!!!)? > -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: rayv Subject: Re: Dataq Instruments free software update Date: Wed, 28 Oct 1998 21:37:09 -0500 what may be happening is the magnet in the geophone is being attracted to the metal case of the computer and that is why it does not appear to have as much noise in the signal. At 05:32 PM 10/27/98 +0000, you wrote: >Gregory Bajuk wrote: > >> This trigger/record feature can be used with the DI-150RS serial port >> A/D module that is available as an Internet special for 49.95. (same as >> the Radio Shack model which sells for 99.99). > >When I called them to order the Internet Special, the salesman said that >the model number is the DI-150SP. The DI-150RS is still about $100. The >difference is the DI-150SP has some kind of offset or drift problem at >the highest internal gain setting. Maybe he was wrong if you're having >such good results? > >I already bought Larry's 16-bit board anyway. > >Speaking of buying stuff... I've got someone hunting for geophones right >now. He found some used untested 4.5 Hz models for about $25. Probably >not including shipping. Let me know if you're interested and I can >return his address. I have him looking for lower frequency models right >now. > >I have my 10 Hz geophone hitched up without an amp or filter and the >noise is huge. Here's an odd bit. I put the geophone on top of the SDR >computer and the noise was lower than when I put it on my old Lehman >prototype base. The base has long wood screws that go into the carpet a >lot more than the flat bottom of the running computer. You'd think that >the computer would be a lot noisier. Also when the geophone was on top >of the computer you could see what was happening in the room a lot >better. Now it doesn't show up or is buried in noise? The next step is >trying it out on the tile floor. Then I'll need to buy an amp/filter. > >,Greg > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Dat... geophone noise Date: Thu, 29 Oct 1998 17:23:18 +0000 rayv wrote: > > what may be happening is the magnet in the geophone is being attracted to > the metal case of the computer and that is why it does not appear to have > as much noise in the signal. I think you're right. I might have also been right about the carpet acting as an amplifier. The noise level on the computer is about +- 80, on the base on the carpet is about +- 120, and last night on the tile was probably closer to +- 200. I didn't record any blank events to check the values exactly and I turned off autosave or it would never stop. I think a filter and a lower freqeuncy geophone will help a lot. I got some PVC pipe and I've been debating to myself what to fill it with. The best thing I think I've come up with is filling it with sand and putting the geohpone wrapped in plastic in epoxy covering the sand. Or maybe aluminum foil? I know sand is supposed to be noisy outside, but as a weight in a sealed container, would it be noisy? Lead would be difficult, unless I just put a bunch of small fishing weights in there. I got at least 8 feet of pipe to play with, so there's room for error. Maybe I should be trying to cast a concrete mass on the outside of the PVC? That might be messier than inside. Just thinking outloud. Neat stuff though, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: [Fwd: Students at the AGU meeting.] Date: Thu, 29 Oct 1998 12:39:53 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Dear Frank, I know you're out of town at NSTA but I figured I'd just pass this info on as follow-up to my earlier email and as a pre-emptive strike against any possible confusion amongst the meeting registration folks at AGU. There will apparently be 10 students registering who are associated with the following abstract submitted by Ted Blank and Jan Froom U42A-27: "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum" I think the registration is being coordinated by Ed Cranswick of the USGS in Golden - he will likely submit the payment, though of course the students are filling out the necessary forms. Thanks for all your help with this. Catherine ----------------------------------------- Dr. Catherine Johnson Education and Outreach Program Manager IRIS 1200, New York Ave., #800 Washington DC 20005 Tel: (202) 682 2220 Fax: (202) 682 2444 Email: catherine@........ Web: http://www.iris.washington.edu/EandO Personal web page: http://magellan.ciw.edu ----------------------------------------- From: "Rex Klopfenstein, Jr." Subject: VBB Block Diagram Date: Thu, 29 Oct 1998 18:22:51 -0500 I have been looking over Sean's Block Diagram of the VBB. Is this basically a PID (proportional/integral/derivative) controller? Also, I see that there is a need for an integrator. I have looked through most of the books I have access to and the discussion of the integrator is somewhat limited. Can anybody point me to sources that have some indepth discussion of the construction of a real world integrator. Any help would be appreciated. -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: VBB integrator Date: Thu, 29 Oct 1998 20:03:33 -0600 (CST) Rex, Re electronic integrators: I can only remark about them in the context of the VBB fedback seismometer. The point here is not to make an optimal integrator, but to satisfy the need of the transfer function, which needs a simple integral of the displacement voltage, with the phase response of a single pole. The integrator used in the triple feedback VBB seismometer uses an instrumentation or an operational amp of very good quality. It can be either a simple inverting configuration, with the capacitor as the feedback to the - input, and the input through a high value resistor, like 2 megohms. The time constant is R*C, or 2 megs * 20 microfarad is 40 seconds. The non-inverting input is grounded, preferably through a similar resistor. For the VBB feedback, since the signal cannot be inverted in the loop, I prefer to use a non-inverting or single pole low pass configuration. Here, the input is through the high value resistor to the + input, and the capacitor is from there to common. The feedback is to the - input through a similar resistor. I use the instrumentation amp (the classical 3 amplifier configuration) because I have a bunch of them on hand, and their high input impedance handles any DC leakage of the capacitors. On the other hand, a single amp like the LM308A or a OPA111 will do fine. It is desirable that the input offset voltage and the current noise be minimal. The OP-97 is an excellent combination of low offset, low noise, and low bias current and low power. The LT1012 is similar. For the capacitor, low leakage electrolytics are useable, (although some commercial units use a large box of polystyrene capacitors), and are connected + to + for a non-polarized performance (at half the value of either). TAG types are quite leaky and thermally unstable. Something that lists as a 5% tolerance is generally of good quality and will work well. These are also useful for the differential feedback capacitor, although non-polarized low-leakage values can be found in the range of this component. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: VBB integrator Date: Thu, 29 Oct 1998 20:09:17 -0800 At 08:03 PM 10/29/98 -0600, you wrote: >For the capacitor, low leakage electrolytics are useable, (although some >commercial units use a large box of polystyrene capacitors), and are connected >+ to + for a non-polarized performance (at half the value of either). >TAG types are quite leaky and thermally unstable. Something that lists >as a 5% tolerance is generally of good quality and will work well. >These are also useful for the differential feedback capacitor, although >non-polarized low-leakage values can be found in the range of this >component. Sean-Thomas' remarks brought something to mind. The temperature coefficient of capacitance of aluminum electrolytics is not very good. This ordinarily wouldn't make much difference since I don't think the value of the integrator capacitor needs to be held too precisely. But if the system is not mechancially zeroed (such as is the case when the spring is not exactly opposing gravity), a constant current through the coil is necessary to add the remaining force. In this case there is a voltage across the integrator capacitor, and a change in capacitance with temperature will result in a change in the voltage across the capacitor in order to maintain the same charge. This could introduce temperature-related drift in the output. Another thing of interest. With an RC integrator in the feedback, there needs to be steady-state voltage out of the displacement transducer to feed current to the voice coil to make up the difference between the spring and gravity. This results in an output offset proportional to this difference. With an op-amp type integrator (with the capacitor in the feedback), a steady-state voltage out of the displacement transducer (and hence the output) isn't needed -- the integrator op-amp supplies the needed current to the voice coil. There is a price to pay, however, which is another stage to do a signal inversion since the op-amp integrator is an inverting stage. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Frank Cooper" Subject: MY 1969 SEISMOGRAPH Date: Fri, 30 Oct 1998 18:03:39 -0600 In case anyone might be interested I have posted pictures of my 1969-74 = seismograph on my web site at http://freeweb.pdq.net/fxc/ Frank Cooper, Friendswood, Texas, USA
In case anyone might be interested I have posted = pictures of=20 my 1969-74 seismograph on my web site at http://freeweb.pdq.net/fxc/
 
Frank Cooper, Friendswood, Texas,=20 USA
From: barry lotz Subject: Kings Beach events Date: Fri, 30 Oct 1998 18:54:22 -0800 Well as luck would have it my power went out from 8:16-11:01 UTC and I missed the whole thing. I think that was the last straw I'm going to invest in a low power 386 SBC! To heck with PG&E. Regards Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "J. D. Cooley" Subject: WinQuake question Date: Fri, 30 Oct 1998 19:14:59 -0800 I realize, of course, that the x-axis is time, but what units are the y-axis in? TIA, "JD" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: WinQuake question Date: Fri, 30 Oct 1998 19:45:27 -0800 JD -- The Y axis is in A/D counts. On Larry's board, full scale is +/- 5 volts. If you have the 12-bit A/D, that's 2.44mV per count, or 152uV per count for the 16-bit A/D. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... At 07:14 PM 10/30/98 -0800, you wrote: >I realize, of course, that the x-axis is time, but what units are the >y-axis in? _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: MY 1969 SEISMOGRAPH Date: Fri, 30 Oct 1998 22:30:37 -0700 Frank- I got started in seismology in 1974 using portable analog seismographs called Big Drum recorders because they recorded on big drums wrapped with smoked paper using a sapphire stylus, but yours is the biggest drum I've seen. You have an incredible amount of patience to persist for three decades until you got your first seismogram!!! -Edward Frank Cooper wrote: > In case anyone might be interested I have posted pictures of my > 1969-74 seismograph on my web site at > http://freeweb.pdq.net/fxc/ Frank Cooper, Friendswood, Texas, USA -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Kings Beach events Date: Fri, 30 Oct 1998 22:36:09 -0700 Barry- Ironically, we, the USGS, just received a grant from PGE of half a megabuck to install 40 strong motion instruments (Kinemetric K2s) in the Santa Clara Valley to study the effects of strong ground motions on their San Jose distribution. -Edward barry lotz wrote: > Well as luck would have it my power went out from 8:16-11:01 UTC and I > missed the whole thing. I think that was the last straw I'm going to > invest in a low power 386 SBC! To heck with PG&E. > > Regards > Barry > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: MY 1969 SEISMOGRAPH Date: Fri, 30 Oct 1998 22:23:34 -0700 Frank Cooper wrote: > In case anyone might be interested I have posted pictures of my > 1969-74 > > seismograph on my web site at http://freeweb.pdq.net/fxc/ Frank > Cooper, Friendswood, Texas, USA OOOHHHH does it bring back nostalgia for me. Trying to make things out of everyday items was itself a difficult thing to try. And of course even getting a magnet like that shown in the S.A. article was very difficult......and in a way, obtaining a equivalent magnet hasn't really changed in the sense of difficulty now. Betcha you enjoyed all the challenges that were a part of it. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: WinQuake question Date: Fri, 30 Oct 1998 23:14:31 -0800 JD, As Karl pointed out, the Y scale is in A/D counts. The reason WinQuake only displays A/D counts is because there is no information in the PSN event file that would let WinQuake know what the Y should be. Even if there was information in the event file for the Y scale, most of us don't know what our sensors are putting out....The only sensors I have with known output characteristics are my strong motion sensors. I have no idea what my Lehman and SG sensors output. The magnitude correction number (for a lack of a better term), used by WinQuake to determine ML and Ms magnitude, does give WinQuake some Y scale information. Station operators determine / calibrate the magnitude correction number by using known size events. The problem with this is the sensitivity of the system includes any local ground amplification or attenuation and is not a direct calibration of the sensor. -Larry Cochrane Redwood City, PSN At 07:45 PM 10/30/98 -0800, you wrote: >JD -- > >The Y axis is in A/D counts. On Larry's board, full scale is +/- 5 volts. >If you have the 12-bit A/D, that's 2.44mV per count, or 152uV per count for >the 16-bit A/D. > >Karl Cunningham >La Mesa, CA. >PSN Station #40 >karlc@....... > > >At 07:14 PM 10/30/98 -0800, you wrote: >>I realize, of course, that the x-axis is time, but what units are the >>y-axis in? > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Kings Beach events Date: Fri, 30 Oct 1998 23:34:50 -0800 I knew something interesting would happen... My system was also down, but I can't blame PG&E. For several years now I have needed a new roof for my house. I finally got around to getting one, so I needed to remove my antennas used to monitor some USGS sensors. I also needed to remove the wires between my sensors located in a spare bed room and my SDR system, since the wires where running over the roof. The roofer is almost done, so I should be back on line in a few days. -Larry Cochrane Redwood City, PSN At 06:54 PM 10/30/98 -0800, Barry wrote: >Well as luck would have it my power went out from 8:16-11:01 UTC and I >missed the whole thing. I think that was the last straw I'm going to >invest in a low power 386 SBC! To heck with PG&E. > >Regards > Barry > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Erich F. Kern" Subject: Re: Kings Beach events Date: Sat, 31 Oct 1998 12:39:20 -0800 Larry, Have you thought of putting your antennas in the attic? I've got UHF-TV and scanner antennas in our attic with low noise broadband preamps at the antennas (no need to weatherproof anything) and get first rate reception from San Diego, 70 miles south of us, even on the high UHF (620 to 806 MHz) channels. The tile roof doesn't seem to have much if any attenuation. This wouldn't work if you have a flat roof and stucco exterior walls since the signal would have to "look" through the wire mesh embedded in the stucco. Cheers, Erich Kern -----Original Message----- From: Larry Cochrane To: PSN-L Mailing List Date: Friday, October 30, 1998 23:35 Subject: Re: Kings Beach events >I knew something interesting would happen... My system was also down, but I >can't blame PG&E. For several years now I have needed a new roof for my >house. I finally got around to getting one, so I needed to remove my >antennas used to monitor some USGS sensors. I also needed to remove the >wires between my sensors located in a spare bed room and my SDR system, >since the wires where running over the roof. > >The roofer is almost done, so I should be back on line in a few days. > >-Larry Cochrane >Redwood City, PSN > >At 06:54 PM 10/30/98 -0800, Barry wrote: >>Well as luck would have it my power went out from 8:16-11:01 UTC and I >>missed the whole thing. I think that was the last straw I'm going to >>invest in a low power 386 SBC! To heck with PG&E. >> >>Regards >> Barry >> > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: CARRJJ@....... Subject: Re: Kings Beach events Date: Sat, 31 Oct 1998 16:12:02 EST I saw one fellow build a UHF antenna "radome" out of a plastic trash can. It was waterproof and provided good signal. Innovation...ain't it neat. Joe Carr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: Test Date: Sat, 31 Oct 1998 22:00:31 -0800 Testing for return. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: Re: WinQuake question Date: Sun, 01 Nov 1998 14:55:32 +0800 Hi, Larry Cochrane wrote: > The magnitude correction number (for a lack of a better term), used by > WinQuake to determine ML and Ms magnitude, does give WinQuake some Y scale > information. Station operators determine / calibrate the magnitude > correction number by using known size events. The problem with this is the > sensitivity of the system includes any local ground amplification or > attenuation and is not a direct calibration of the sensor. > I found that the magnitude corrections (Ml & Ms) for the teleseismic and local events to be different. On my system the teleseismic events are 0.00013 and 0.0003 for the local events. The match between my recordings of the local events and the results published by the geophysical observatory are very close. From this, I have assumed that the S-G seismometer that uses larry's electronics is giving out displacement information. Would that be a correct assumption? Arie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: geophone tilting Date: Sun, 1 Nov 1998 09:25:40 EST Sean; OK I haven't seen the specs on this geophone. I assumed it is much like most miniture and sub miniture geophones used in the exploration today. I'll call Geospace and get a data sheet. When I first started in seismic exploration in 1948 (wow!) the phones we had then were about 6 inches in diameter & had very stiff springs connected to one side of the coil & the spring worked like a hinge. This would not give a linear response good enough for todays exploration needs. They would work sideways, upside down, etc. In a message dated 10/28/98 9:40:50 AM Pacific Standard Time, sean@........... writes: << The statements I posted are correct, since the data was taken directly from the data sheet for the Geospace HS-1-LT geophones. >> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: geophone tilting Date: Sun, 01 Nov 1998 18:41:05 +0000 GeE777@....... wrote: > > Sean; > OK I haven't seen the specs on this geophone. I assumed it is much like most > miniture and sub miniture geophones used in the exploration today. I'll call > Geospace and get a data sheet. There's a photo on their website. I have the data sheets also and they're very similar to what the web site says. http://www.geospacecorp.com/ http://www.geospacecorp.com/hs1.htm ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: UNLISTED QUAKES and DATAQ DI-150RS Date: Sun, 01 Nov 1998 11:55:46 -0800 Stephen & Kathy wrote: > > Pinpoint EQ Alert News - http://www.televar.com/~earth/alert.html > > FYI Here is a list of quakes that I have recorded that have not > been posted on the Cal. or Nev. quake lists!!! They will probably > be added Mon. or Tues. when they go back to work. > The quakes are probably aftershockes near the Kings Beach area! > Although the Portola and Quincy areas are also about the same distance! > > DATE TIME PST My rough guess > approx. MAG. > > 10/31/98 01:33:32 2.7 > 10/31/98 03:50:29 2.9 > 10/31/98 16:23:29 2.8 > 10/31/98 18:10:35 3.0 > 10/31/98 22:26:08 3.8 This one should have been felt!!! > > I think my Mag. guesses will be on the conservative side!! > Times are approx. because I had to estimate the travel time and the > error of my clock! > The P to S wave times were approx. 13 sec. which puts the travel time > at approx. 18 sec. and my clock gains approx. .5 sec. per hour! I > normally try to set my clock a couple of times a day. > Hi ALL, I sent the above message to Pinpoint earlier so that I could use the lazy way of putting their link in this meassage!!! For those interested in the DataQ DI-150RS you can go to the Pinpoint link above and click on the GIFNOW botton to see a GIF of the KINGS BEACH 5.3 trace that I recorded with my DI-150RS! I'm using one sensor driving 2 single voltage amps. (one turned up to high gain the other turned down to low gain) and recording on both channels! I use a seperate program to add text to the GIF and send them to Bob Shannon who then posts them on his site! It gets updated from time to time whenever I send him new or interesting GIFs. I'm sure he won't mind you returning to see when or if it has been updated!! It's my 2 cents worth of outreach!! Stephen Mortensen PSN Station # 55 near Pilot Hill Ca. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: WinQuake question Date: Sun, 01 Nov 1998 16:43:48 -0700 Arie- We never got around to checking it out when I visited you in Perth last April, but I believe that the low-gain SG output is acceleration and the high-gain is velocity. If you integrate the acceleration trace with the WinQuake integration option, it should look identical to the velocity, neglecting different noise and digitization levels. If you integrate the velocity trace, you should obtain displacement. and the peak value of that, scaled by the known absolute or estimated relative factors, could be used to calculate Richter local magnitude. Larry and I also got distracted from this issue by the PSN presentation at AGU last December and never resolved the matter. -Edward Arie Verveer wrote: > Hi, > > Larry Cochrane wrote: > > > The magnitude correction number (for a lack of a better term), used by > > WinQuake to determine ML and Ms magnitude, does give WinQuake some Y scale > > information. Station operators determine / calibrate the magnitude > > correction number by using known size events. The problem with this is the > > sensitivity of the system includes any local ground amplification or > > attenuation and is not a direct calibration of the sensor. > > > > I found that the magnitude corrections (Ml & Ms) for the teleseismic and local events > to be different. On my system the teleseismic events are 0.00013 and 0.0003 > for the local events. The match between my recordings of the local events > and the results published by the geophysical observatory are very close. > > >From this, I have assumed that the S-G seismometer that uses larry's electronics > is giving out displacement information. Would that be a correct assumption? > > Arie > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Quake last night in AZ? Date: Sun, 01 Nov 1998 18:11:56 -0700 (MST) Hello, Anybody find or hear any info on a quake last night at the Grand Canyon? I can't find a listing anywhere... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: GeE777@....... Subject: Re: geophone tilting Date: Sun, 1 Nov 1998 20:38:15 EST Hello Again, I see now why I was not familar with the HS-1-LT. It is used for industrial vibration monorting and not seismic studies. The HS threw me off as the old HS geophones were manufactured by Hall-Sears, which sold out to GeoSpace a number of years ago. I have 48, HS-J, 14HZ geophone elements in my office I want to get rid of. In a message dated 11/1/98 10:41:54 AM Pacific Standard Time, ghost@............. writes: << There's a photo on their website. I have the data sheets also and they're very similar to what the web site says. >> George Erich Seismic Exploration Consultant P. O. Box 2011, Norwalk, CA 90650, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Update on Web page Date: Sun, 01 Nov 1998 21:38:00 -0500 To all: I have updated the STM-8 feedback analysis "loop2.pdf" Finished the feedback path. available at http://members.home.net/nordgren/public/ Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Quake last night in AZ? Date: Mon, 02 Nov 1998 08:14:37 -0800 At 06:11 PM 11/1/98 -0700, you wrote: >Hello, > Anybody find or hear any info on a quake last night at the Grand Canyon? I >can't find a listing anywhere... John -- Didn't see (or detect) anything near the Grand Canyon. There was a couple in Baja, though. 98/11/02 10:16:06 31.93N 115.77W 6.0 3.9Ml BAJA CALIFORNIA, MEXICO 98/11/02 14:24:01 27.93N 112.94W 10.0 4.3Mb C BAJA CALIFORNIA, MEXICO Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Update on Web page Date: Mon, 02 Nov 1998 09:02:55 -0800 Brett -- Very interesting analysis. Couple of comments: You wrote: >Finally because the coil resistance is low compared with the three feedback branches, What makes me unsure about this is two things: 1) Sean-Thomas's advice that coil resistance IS significant, and 2) Using his transfer function and changing the coil resistance changes the shape of the response curve. Even the change between 7 ohms and zero makes a noticeable difference. A related issue, as you suggest, is back EMF. I think that the back EMF is more or less proportional to relative magnet-coil velocity, which may be negligible if the feedback is doing its job. And, if it turns out that the coil resistance is not significant, then the feedback can be assumed to be from a high-enough impedance that the back EMF across the coil shouldn't matter anyway. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Update on Web page Date: Mon, 02 Nov 1998 13:00:59 -0500 Karl At 09:02 AM 11/2/98 -0800, you wrote: >Brett -- > >Very interesting analysis. > >Couple of comments: > >You wrote: >>Finally because the coil resistance is low compared with the three >feedback branches, > >What makes me unsure about this is two things: 1) Sean-Thomas's advice that >coil resistance IS significant, and 2) Using his transfer function and >changing the coil resistance changes the shape of the response curve. Even >the change between 7 ohms and zero makes a noticeable difference. > I don't disagree. I just assumed zero resistance to simplify this calculation. If the coil resistance is too high, the expressions I was using would no longer be correct, (they would need to become slightly more complicated). The difference between 0 and 8 ohms *is not* significant in the proportional (.002%) and integral (.008%) feedback branches, but at higher frequencies it looks like it does affect the derivative feedback branch; about 1% at 8 Hz and almost 10% by 80 hz. Looks like I need to fix up that branch. Will plan to post the revised data tonight. >A related issue, as you suggest, is back EMF. I think that the back EMF is >more or less proportional to relative magnet-coil velocity, which may be >negligible if the feedback is doing its job. And, if it turns out that the >coil resistance is not significant, then the feedback can be assumed to be >from a high-enough impedance that the back EMF across the coil shouldn't >matter anyway. I think it's almost certain that it doesn't matter. That was just a note to remind me to try sometime to prove it for myself. > >Karl Cunningham Thanks for the help. Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: Windaq trigger mode. Date: Mon, 02 Nov 1998 11:15:50 I have an ongoing dialoge with Ken at widaq and this is the latest message I received from him. The question was, wish it was more that 2 channels. >X-Sender: dataq@............ >Date: Mon, 02 Nov 1998 10:05:12 -0500 >To: Norman Davis WB6SHI >From: Kenneth Spikowski >Subject: Re: Windaq trigger mode. > >An imminent release of the WinDaq/100 software for WinNT (a 32-bit >application which also runs under Win95 or Win98) will allow multiple >DI-150 modules in a system if you have more than one COM port available. It >will be necessary to run multiple instances of the acquisition software, >and the data from each module must go into a separate file. The DLL name >(such as DI100NT.DLL renamed to DI101NT.DLL) and COM port number are passed >to the application as command line parameters such as -DDI101NT.DLL -N2. > > > Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Minimun Computer and Win95 Date: Mon, 2 Nov 1998 14:24:57 -0800 (PST) I have been looking for a cheap data logging computer that will run Win95 and the DI-150RS software(which requires WIN95 or above for the trigger feature to work). At some used computer stores the tech people say I need a minimum of a 486DX66 to run Win95. Other stores say I could use a 486SX 25Mhz. At one store the techie said that the minimum configuration to run a bare bones Win95 is 486SX 25, 8meg ram, about 150 meg hard drive(60 meg for bare bones Win95, 2 meg for dataq software, and the rest for data logging), and a CD ROM drive to load Win95 into the computer. Once loaded the CD ROM isn't needed. Does anyone on the list have some information about this? Thanks Greg Bajuk _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Minimun Computer and Win95 Date: Mon, 02 Nov 1998 22:58:34 +0000 Gregory Bajuk wrote: > > I have been looking for a cheap data logging computer that will run Win95 > and the DI-150RS software(which requires WIN95 or above for the trigger > feature to work). At some used computer stores the tech people say I need > a minimum of a 486DX66 to run Win95. Other stores say I could use a > 486SX 25Mhz. The Windows 95 box says 386DX, 4 MB RAM, 35-40 MB disk space. I have seen it on a 486SX20, 12 MB RAM and it's OK. If you're worried about price, shop around a bit more. I just upgraded my SDR machine to a 486DX2/50 with 32 MB RAM and a 213 MB disk for about $50. It used to be a 386DX40 with 20 MB RAM. I had to do a lot of swapping and switching to put it together. The $50 was for a box of spare parts and spare cases from an engineering company now using Pentium IIs. If I upgrade my primary computer's disk, the current disk will get plugged into the 486, so I can put Linux on it. I just put a new modem in a computer for someone else. They bought a 486DX2/66, 12 MB RAM, 200 MB disk with a nice 15" monitor and a color Canon printer at a garage sale for $40. It needed one $10 cable. Have fun, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ralvarez@........ (Raul Alvarez) Subject: Re: Minimun Computer and Win95 Date: Mon, 2 Nov 1998 16:59:25 -0700 (MST) >I have been looking for a cheap data logging computer that will run Win95 >and the DI-150RS software(which requires WIN95 or above for the trigger >feature to work). At some used computer stores the tech people say I need >a minimum of a 486DX66 to run Win95. Other stores say I could use a >486SX 25Mhz. > If you are searching for and inexpensive 486 (or any other), try attending a local university surplus auction. Around here (Colorado) I see MANY 486 type machines go in the $15 range. Start by calling the property disposal office or central receiving. They can probably tell you if they have auctions. Avoid calling the "information office", they often don't have knowledge of that type of information. BTW, a LOT of good scientific and test equipment is found at these auctions. Raul _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: PSN-L: Minimun Computer and Win95 Date: Mon, 2 Nov 1998 15:59:49 +0000 Hello Gregory, Minimum computer speed is highly subjective and dependent upon individual preferences as well as the required application performance. If you were to say, want to run AutoCAD 14 in Win95 (and be productive), the minimum machine hardware would a fast Pentium with much ram, ~64mb upto 256 mb. I built my nephew a Win95 machine which he uses to play DukeNukem :) and it is a 486 DX2/66 with 16mb of ram. It is adequate. I have an NT network with six machines and the kids come over on weekends, they and my nephew all play DukeNukem on it via the network, 16 year-old Romper-Room :) I personally would not run Win95 in anything less than 486DX/2-66 and 16mb ram. The more graphics the more ram needed --in any machine. Best Wishes, Walt Williams, 98.11.02 dfheli@.............. http://www.pacificnet.net/~dfheli ============================ ------- Forwarded Message Follows ------- Date: Mon, 2 Nov 1998 14:24:57 -0800 (PST) From: Gregory Bajuk To: psn-l@............. Subject: Minimun Computer and Win95 Reply-to: PSN-L Mailing List I have been looking for a cheap data logging computer that will run Win95 and the DI-150RS software(which requires WIN95 or above for the trigger feature to work). At some used computer stores the tech people say I need a minimum of a 486DX66 to run Win95. Other stores say I could use a 486SX 25Mhz. At one store the techie said that the minimum configuration to run a bare bones Win95 is 486SX 25, 8meg ram, about 150 meg hard drive(60 meg for bare bones Win95, 2 meg for dataq software, and the rest for data logging), and a CD ROM drive to load Win95 into the computer. Once loaded the CD ROM isn't needed. Does anyone on the list have some information about this? Thanks Greg Bajuk _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: David Josephson Subject: Re: Minimun Computer and Win95 Date: Mon, 2 Nov 1998 16:06:56 -0800 (PST) Any 486 will work but you need at least 16 MB of memory to avoid major slowdowns as the operating system moves pieces of itself on and off disk. Around here 486's with 16 MB and a small hard drive sell for about $100. -- David Josephson / Josephson Engineering / San Jose CA / david@............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Minimun Computer and Win95 Date: Mon, 02 Nov 1998 17:06:27 -0800 At 02:24 PM 11/2/98 -0800, you wrote: >I have been looking for a cheap data logging computer that will run Win95 >and the DI-150RS software(which requires WIN95 or above for the trigger >feature to work). At some used computer stores the tech people say I need >a minimum of a 486DX66 to run Win95. Other stores say I could use a >486SX 25Mhz. > >At one store the techie said that the minimum configuration to run a bare >bones Win95 is 486SX 25, 8meg ram, about 150 meg hard drive(60 meg for >bare bones Win95, 2 meg for dataq software, and the rest for data >logging), and a CD ROM drive to load Win95 into the computer. Once loaded >the CD ROM isn't needed. Greg -- Look at flea markets and swap meets. Some even specialize in electronic stuff. The mother board I am using for my SDR machine is a 486dx-2/66 VLB and cost me $3. Others I know at work have gotten similar motherboards in working order for $1 including processor. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Wayne Abraham Subject: New Public Seismic Network Date: Mon, 02 Nov 1998 21:13:46 -0400 Hello, My name is Wayne Abraham on the Caribbean island of Dominica. We are located midway down the island chain, about 500 miles south-east of Puerto Rico. Dominica (not the Dominican Republic) is an independent island nation which attained its independence from Great Britain in November 1978. I am not a geologist, seismologist, volcanologist or anything near that. I am an electrician who got interested in the field because of certain circumstances. Our island is the most rugged of all the caribbean islands and we have 10 volcanoes on 289 square miles. We sit on the Atlantic/Caribbean plate boundry, have the most volcanoes per square mile and the world's largest boiling lake. Recently there has been an upsurge of activity in the vicinity of a cluster of volcanoes in the south of the island. Numerous tremours have been felt by locals and there has been rockfalls and cracking of concrete structures. The island's seismic activity is being monitored by the Seismic Research Unit of the University of the West Indies in Trinidad. I can give more geologic background information on the island if anyone is interested. I was able to get our local amateur radio club, of which I am a member, interested in setting up a public seismic network where we could share data from both local and regional events. There is no public seismic network on any of the islands and most people seem to think that only professionals can monitor seismic activity. This way of thinking I wish to change and I have already found 5 members of our club who are willing to get into actively monitoring seismic events. Our problem though is funds. Our club operates on a shoe string budget and most of the repeater equipment we have on our mountains are donated. I am looking for anyone who may be able to assist us in getting donated equipment etc. for our project. Your assistance will be greatly appreciated. Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: Minimun Computer and Win95 Date: Mon, 02 Nov 1998 20:25:03 -0500 We had several at where I work and we couldn't give them away!! Karl Cunningham wrote: > The mother board I am using for my SDR machine is a 486dx-2/66 VLB > and cost me $3. Others I know at work have gotten similar motherboards in > working order for $1 including processor. > > > -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Minimun Computer and Win95 Date: Mon, 02 Nov 1998 20:37:29 -0800 If you do buy a used computer, make sure its Y2K compliant. There are a lot of motherboards / systems that will not work correctly after 12/31/1999. A simple way to test for the Y2K bug is to boot up the system and set the date and time to 12/31/1999 23:55:00. Now shutdown the system and wait 10 minutes. After booting up again, check the date/time. If the date goes back to 1980, or some other date other than 1/1/2000, the system is not Y2K compliant. -Larry Cochrane Redwood City, PSN At 02:24 PM 11/2/98 -0800, you wrote: >I have been looking for a cheap data logging computer that will run Win95 >and the DI-150RS software(which requires WIN95 or above for the trigger >feature to work). At some used computer stores the tech people say I need >a minimum of a 486DX66 to run Win95. Other stores say I could use a >486SX 25Mhz. > >At one store the techie said that the minimum configuration to run a bare >bones Win95 is 486SX 25, 8meg ram, about 150 meg hard drive(60 meg for >bare bones Win95, 2 meg for dataq software, and the rest for data >logging), and a CD ROM drive to load Win95 into the computer. Once loaded >the CD ROM isn't needed. > >Does anyone on the list have some information about this? > >Thanks Greg Bajuk _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: curtis Subject: Re: Minimun Computer and Win95 Date: Mon, 02 Nov 1998 20:56:32 +0000 But Larry _if_ 1K=1024 _then_ Y2K will not occur until 2048 _and_ _if so_ , I don't think we will have to worry about it (snicker). Apologies to the list, but I could not resist the humor (smile). Larry Cochrane wrote: > > If you do buy a used computer, make sure its Y2K compliant. There are a lot > of motherboards / systems that will not work correctly after 12/31/1999. > > A simple way to test for the Y2K bug is to boot up the system and set the > date and time to 12/31/1999 23:55:00. Now shutdown the system and wait 10 > minutes. After booting up again, check the date/time. If the date goes back > to 1980, or some other date other than 1/1/2000, the system is not Y2K > compliant. > > -Larry Cochrane > Redwood City, PSN > > At 02:24 PM 11/2/98 -0800, you wrote: > >I have been looking for a cheap data logging computer that will run Win95 > >and the DI-150RS software(which requires WIN95 or above for the trigger > >feature to work). At some used computer stores the tech people say I need > >a minimum of a 486DX66 to run Win95. Other stores say I could use a > >486SX 25Mhz. > > > >At one store the techie said that the minimum configuration to run a bare > >bones Win95 is 486SX 25, 8meg ram, about 150 meg hard drive(60 meg for > >bare bones Win95, 2 meg for dataq software, and the rest for data > >logging), and a CD ROM drive to load Win95 into the computer. Once loaded > >the CD ROM isn't needed. > > > >Does anyone on the list have some information about this? > > > >Thanks Greg Bajuk > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- curtis - ufkartfm@........... - site administrator for Nobody I want Nobody to control my life! How about you? http://www.netvideo.com/nobody -Please Register and Vote for the Candidate of Your Choice- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: New Public Seismic Network Date: Tue, 03 Nov 1998 07:55:28 -0700 (MST) On Mon, 2 Nov 1998, Wayne Abraham wrote: > My name is Wayne Abraham on the Caribbean island of Dominica. > I am not a geologist, seismologist, volcanologist or anything near that. > I am an electrician who got interested in the field because of certain > circumstances. Our island is the most rugged of all the caribbean > islands and we have 10 volcanoes on 289 square miles. We sit on the > Atlantic/Caribbean plate boundry, have the most volcanoes per square > mile and the world's largest boiling lake. Recently there has been an > upsurge of activity in the vicinity of a cluster of volcanoes in the > south of the island. Numerous tremours have been felt by locals and > there has been rockfalls and cracking of concrete structures. The > island's seismic activity is being monitored by the Seismic Research > Unit of the University of the West Indies in Trinidad. I can give more > geologic background information on the island if anyone is interested. Absolutely... > I was able to get our local amateur radio club, of which I am a member, > interested in setting up a public seismic network where we could share > data from both local and regional events. There is no public seismic > network on any of the islands and most people seem to think that only > professionals can monitor seismic activity. This way of thinking I wish > to change and I have already found 5 members of our club who are willing > to get into actively monitoring seismic events. It sounds like all of you have more than enough reason to monitor activity for yourselves! That way you can get an idea of what is happening volcanically without having to hear it through more official channels... > Our problem though is funds. Our club operates on a shoe string budget > and most of the repeater equipment we have on our mountains are donated. > I am looking for anyone who may be able to assist us in getting donated > equipment etc. for our project. > Your assistance will be greatly appreciated. If I hear of anything, I'll be glad to help. I might be able to scrounge up some older equipment like a short period vertical seismometer... I'll check on that, and see if I find anything. ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: DI-150RS limitations Date: Tue, 3 Nov 1998 14:31:49 -0700 (MST) Unless someone writes some seismology software for the DI-150, it looks like its use is limited by poor timing and lack of pre-trigger information for serious seismology. JCLahr > From JohnJan@........ Mon Nov 2 20:51 MST 1998 > X-Sender: jlahr@................ > Date: Mon, 02 Nov 1998 20:51:57 -0700 > To: "John C Lahr, Lakewood, CO " > From: The Lahrs > Subject: Re: DI-150RS software > Mime-Version: 1.0 > > >Return-Path: > >X-Sender: dataq@............ (Unverified) > >Date: Mon, 02 Nov 1998 14:08:19 -0500 > >To: The Lahrs > >From: Kenneth Spikowski > >Subject: Re: DI-150RS software > > > >The time of the first sample recorded in the header of a WDQ file is only > >stored to the nearest second. The start time of each triggered burst is > >stored in the trailer as the number of seconds relative to this start time. > >Even if we were to change the file format to store the trailer values as > >the number of .01 seconds relative, the long-term accuracy would be only as > >good as the PC clock frequency, typically 1 second per day. The TBF values > >displayed by WWB within each burst would only be as accurate as the crystal > >timing the COM ports. Timing events to .01 second would require hardware > >synchronization to WWVL or GPS satellites. > > > >The header and trailer formats for WinDaq files are available on our Web > >site under On-line Articles, WINDAQ File Format. The 200SDK Installation > >for Windows also contains C header files HDRDEF.H and HDRDEF32.H that > >define the header. > > > >Triggered Storage mode was developed as a low-budget feature which looks at > >the data in the 32-bit disk storage process. It is enabled by setting data > >bit 1 in the trglevel field of the chinfo of struct hdrcmn. The ground > >rules were that it need not run under Windows 3.x and would not support > >pretrigger data (as most of our more expensive hardware does). > > > >We could probably allow Triggered Storage mode to scroll if the Erase Bar > >is turned off if we felt that this behavior would not confuse users. We are > >running out of spare bits in the header and hate to waste them on something > >like this, hastening a header change with serious compatibility implications. > > > > > ************************** > Dear Ken, > > I am a seismologist with the US Geological Survey and have been working > on a "table-top" seismology demonstration for grades K-12. As part of > the setup I used a small exploration geophone in conjunction with an > AD and computer display in "scroll mode." > > I have been searching for the most cost effective AD and computer software > to recommend to teachers, as they are generally on a very tight budget. > So far, the DATAQ DI-150RS and its acquisition software is the best I > have found, and I want to thank you for creating such a cost effective > product. > > In fact, with the trigger mode available now, teachers could easily set up > an operating seismograph to record earthquakes. The key thing that is > necessary for getting useful seismic data is knowing the time of every > sample. To what precision is the time of the first sample recorded in the > header of a WDQ file? Is this only to the nearest second? If so, could > a change be made to record this information to the nearest .01 second? > If the first sample time were recorded to the nearest .01 second, how > close would it be to the PC system time? In other words, does the > acquisition system keep close track of the PC's clock in creating its > time stamp information? > > Could I get the details of the header format? I would like to convert > the .WDQ files into the format used to share data within the Public > Seismic Network community. > > Once the header time is accurate and precise to .01 second, then for > seismology it would be desirable for the time indicated for the > cursor in the WWB browser to given to .01 seconds as well. Once this > change was made, one could line the cursor up with a particular phase > and read off the arrival time. > > One other thing that is required for seismology is the inclusion of > some pre-trigger data with each recorded event. Usually the arrival > builds up over a second or two prior to reaching the trigger threshold. > In seismology we want to measure the time of the first energy, which is > then prior to the trigger time. > > A less critical, but desirable change, would be to make the scroll mode > available when in trigger mode. The current free-run mode, where the > screen is overwritten, is a bit confusing. > > I wish I could say that the USGS has a lot of money to contribute to > making these changes, but unfortunately this is not the case. My > efforts in this are mostly "after hours." However, these changes would > make your product more appealing to teachers and to amateur seismologists, > which I think would lead to more sales. At $50 each, this is clearly not > a big money maker, but there must be good advertising value and good will > created by providing an effective and popular educational tool. > > This coming Thursday I'll be demonstrating Table-Top Seismology at the > National Middle School Association's annual conference that has an > attendance of 10,000 teachers. If you want, I'll let you know what > response I get from the teachers. > > Cheers, > John > > > > > > > * John C. and Jan H. Lahr * > * JohnJan@........ * > * 1925 Foothills Road * > * Golden, Colorado 80401-1718 * > * (303) 215-9913 * > * http://lahr.org/john-jan * > * AOL version of homepage: * > * http://lahr.org/john-jan/homepage.html * > * http://giseis.alaska.edu/lahr * > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: Minimun Computer and Win95 Date: Tue, 03 Nov 1998 18:50:35 -0500 Some of the newer motherboards can be upgraded to Y2K compliant by updating the BIOS which can be "flashed". We had a job we were reworking and it had a IBM ValuePoint box. We found a BIOS upgrade at IBM's homepage. Larry Cochrane wrote: > If you do buy a used computer, make sure its Y2K compliant. There are a lot > of motherboards / systems that will not work correctly after 12/31/1999. > -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: PSN - SDR Question? Date: Tue, 03 Nov 1998 19:10:30 -0500 I have just installed my SDR acquisition board (16 bit) into my system and now in the process of 'playing'. I have one question. When I place a very short jumper between an analog input and analog ground right at the plug on the card I would expect to see 0 counts or very close to 0. What I do see is a signal that ranges from +3 to -15 or -16 counts using the max/min function on the analog count output display. Is this a problem? It seems that I have lost the difference between the 12 bit and the 16 bit adc! -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Minimun Computer and Win95 Date: Tue, 03 Nov 1998 16:14:07 -0800 At 06:50 PM 11/3/98 -0500, you wrote: >Some of the newer motherboards can be upgraded to Y2K compliant by updating the >BIOS which can be "flashed". We had a job we were reworking and it had a IBM >ValuePoint box. We found a BIOS upgrade at IBM's homepage. And some of the motherboards that are not totally compliant and for which upgrades are not available can be used if not allowed to run over the Y2K transition. I've experimented with mine, and have found that once it gets past 00:00:00 on 1/1/2000, it's fine. So, I plan to stop SDR on 12/31/1999 at 23:59:45 or so, and turn the computer off. I'll reboot it about 30 seconds later and set the clock (which will have reverted to 1980), then start SDR again. If it goes like my tests have, all should be fine from then on. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Minimun Computer and Win95 Date: Tue, 03 Nov 1998 18:08:24 -0800 I have been think about adding a year test to SDR. SDR would check the year when it first starts up. If its below say 1998, it would add an offset, supplied by the user (and saved in the INI file), to make the year correct. -Larry Cochrane At 04:14 PM 11/3/98 -0800, Karl Cunningham wrote: >At 06:50 PM 11/3/98 -0500, you wrote: >>Some of the newer motherboards can be upgraded to Y2K compliant by >updating the >>BIOS which can be "flashed". We had a job we were reworking and it had a IBM >>ValuePoint box. We found a BIOS upgrade at IBM's homepage. > >And some of the motherboards that are not totally compliant and for which >upgrades are not available can be used if not allowed to run over the Y2K >transition. I've experimented with mine, and have found that once it gets >past 00:00:00 on 1/1/2000, it's fine. So, I plan to stop SDR on 12/31/1999 >at 23:59:45 or so, and turn the computer off. I'll reboot it about 30 >seconds later and set the clock (which will have reverted to 1980), then >start SDR again. If it goes like my tests have, all should be fine from >then on. > > >Karl Cunningham >La Mesa, CA. >PSN station #40 >karlc@....... > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Jim Hannon Subject: Re: DI-150RS limitations Date: Tue, 03 Nov 1998 20:11:45 -0600 John, You might want to investigate Bsoft http://www.bsof.com/anaprod.htm products for an inexpensive A/D converter. They probably still need some software but would not have the timing problems associated with using the serial port. -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: Minimun Computer and Win95 Date: Tue, 03 Nov 1998 18:32:49 At 02:24 PM 11/2/98 -0800, you wrote: >I have been looking for a cheap data logging computer that will run Win95 >and the DI-150RS software(which requires WIN95 or above for the trigger >feature to work). At some used computer stores the tech people say I need >a minimum of a 486DX66 to run Win95. Other stores say I could use a >486SX 25Mhz. I am running win95 on a 486dx2 66 and 8 megs of ram and 500mb drive. It is ok for light weight stuff like data logging but internet is very slow. I am sure that 16 megs of ram would help. Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Minimun Computer and Win95 Date: Tue, 03 Nov 1998 18:46:30 -0800 Rex I also saw recently a ISA card advertised to allow your system to be compliant. I can't remember where I saw it. Barry Rex Klopfenstein, Jr. wrote: > Some of the newer motherboards can be upgraded to Y2K compliant by updating the > BIOS which can be "flashed". We had a job we were reworking and it had a IBM > ValuePoint box. We found a BIOS upgrade at IBM's homepage. Rex Klopfenstein, Jr. wrote: > Some of the newer motherboards can be upgraded to Y2K compliant by updating the > BIOS which can be "flashed". We had a job we were reworking and it had a IBM > ValuePoint box. We found a BIOS upgrade at IBM's homepage. > > Larry Cochrane wrote: > > > If you do buy a used computer, make sure its Y2K compliant. There are a lot > > of motherboards / systems that will not work correctly after 12/31/1999. > > > > -- > Rex Klopfenstein, Jr. > Bowling Green, OH > rklopfen@......... > www.wcnet.org/~rklopfen > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ted Blank Subject: Re: DI-150RS limitations Date: Tue, 3 Nov 1998 22:42:19 -0800 (PST) EMON already supports the ANA201 from Bsoft. However I did not find it to be a reliable card in my tests. For an inexpensive A/D card I recommend the Computer Boards CIO-DAS08jr/16-AO. The engineers are former Kiethly-Metrabyte employees, and for $99 you get a really rock solid and easy to program (yay!) board. (Naturally I have no investment in this company - they are doing well which means I never would have bought their stock in the first place) PS - my 14 yr old son and I were printing pages from www.chemicalelements.com for his science course. I printed off the license page which gives permission to print any pages you want. He asked what a license was, so I explained that it gave you permission to use a program or web site in a certain way. He thought about it for a minute, then asked, "Is that what it means when the computer says 'your program has performed an illegal operation and will be shut down?'" I am still laughing. I think. Ted Blank San Jose, California On Tue, 3 Nov 1998, Jim Hannon wrote: > John, > You might want to investigate Bsoft http://www.bsof.com/anaprod.htm > products for an inexpensive A/D converter. They probably still need some > software but would not have the timing problems associated with using > the serial port. > > -- > Jim Hannon > http://soli.inav.net/~jmhannon/ > 42,11.90N 91,39.26W > WB0TXL > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: PSN - VBB Prototype Picture Date: Wed, 04 Nov 1998 09:06:25 -0500 Sean I was reading the abstract of your 1998 paper. I took a look at picture of your prototype. Have you made some changes to the design? It looks longer and the displacement transducer is located differently that in your drawings. -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... http://www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Dan" Subject: Re:ISA CARD FIX Y-2K Date: Wed, 4 Nov 1998 08:02:54 -0800 The ISA card for y2k fix was in this months sale paper, from -- I think the name was either j&r or J&D micro divice in sunnvale ca.. it sold for 29.95. in you need the address i will try to find the add. my wife says i never throw anything away Dan - --Original Message----- From: barry lotz To: PSN-L Mailing List Date: Tuesday, November 03, 1998 6:45 PM Subject: Re: Minimun Computer and Win95 >Rex > I also saw recently a ISA card advertised to allow your system to be compliant. >I can't remember where I saw it. > Barry > > >Rex Klopfenstein, Jr. wrote: > >> Some of the newer motherboards can be upgraded to Y2K compliant by updating the >> BIOS which can be "flashed". We had a job we were reworking and it had a IBM >> ValuePoint box. We found a BIOS upgrade at IBM's homepage. > >Rex Klopfenstein, Jr. wrote: > >> Some of the newer motherboards can be upgraded to Y2K compliant by updating the >> BIOS which can be "flashed". We had a job we were reworking and it had a IBM >> ValuePoint box. We found a BIOS upgrade at IBM's homepage. >> >> Larry Cochrane wrote: >> >> > If you do buy a used computer, make sure its Y2K compliant. There are a lot >> > of motherboards / systems that will not work correctly after 12/31/1999. >> > >> >> -- >> Rex Klopfenstein, Jr. >> Bowling Green, OH >> rklopfen@......... >> www.wcnet.org/~rklopfen >> >> _____________________________________________________________________ >> >> Public Seismic Network Mailing List (PSN-L) >> >> To leave this list email listserver@............. with the body of the >> message: leave PSN-L > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: PSN - SDR Question? Date: Wed, 04 Nov 1998 08:23:04 -0800 At 07:10 PM 11/3/98 -0500, you wrote: >I have just installed my SDR acquisition board (16 bit) into my system >and now in the process of 'playing'. I have one question. When I place >a very short jumper between an analog input and analog ground right at >the plug on the card I would expect to see 0 counts or very close to 0. >What I do see is a signal that ranges from +3 to -15 or -16 counts using >the max/min function on the analog count output display. Is this a >problem? It seems that I have lost the difference between the 12 bit >and the 16 bit adc! Rex -- That noise level sounds a little high compared to what I see, but not too much different. My noise level using just the A/D card runs between +5 to -5 counts -- about 10 counts total. You can use the zero offset function in SDR to make your noise symmetrical around zero. You might try plugging the A/D card into a different slot in the computer. I found that the least-noisy slot was the one farthest from the hard disk (closest to the side panel of the enclosure). Also move other plug-in cards as far away from the A/D card as you can. Some noise level is normal. I looked up the specs on the A/D chip and found that +/- 3 to 5 counts is not unusual. It's too bad that a chip manufacturer makes a 16-bit part that has such a noise level that makes the last 2-3 bits unusable without averaging. I wonder if there is a better chip that could be used (perhaps for more $) without circuit or software changes. Larry may have looked into this. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Geophones for sale Date: Wed, 04 Nov 1998 17:12:21 +0000 I think I've pretty much contacted every geophone dealer in the USA. I ended up getting the Geospace GS-11D 4.5 Hz. The next step up is R.T. Clark. The person on the phone said they have some 1 Hz seismometers for $375-7__? US. The next step down appears to be the used geophones from Mitcham Industries. There's very little price difference between 4.5 Hz and the higher frequencies. After that get a loan. ;) I thought someone might want to know. Also I found a web site of a student working on using a GS-11D as a cheap seismometer. No response yet. Of course, I'm bugging him. http://cdr.stanford.edu/DD/SMSSL/Geophones/GeophoneResearch.html ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ted Blank Subject: Re:ISA CARD FIX Y-2K Date: Wed, 4 Nov 1998 10:32:07 -0800 (PST) That would be JDR Micro Devices. Ted Blank San Jose, California On Wed, 4 Nov 1998, Dan wrote: > The ISA card for y2k fix was in this months sale paper, from -- I think > the name was either j&r or J&D micro divice in sunnvale ca.. it sold for > 29.95. > in you need the address i will try to find the add. > my wife says i never throw anything away > Dan > - > --Original Message----- > From: barry lotz > To: PSN-L Mailing List > Date: Tuesday, November 03, 1998 6:45 PM > Subject: Re: Minimun Computer and Win95 > > > >Rex > > I also saw recently a ISA card advertised to allow your system to be > compliant. > >I can't remember where I saw it. > > Barry > > > > > >Rex Klopfenstein, Jr. wrote: > > > >> Some of the newer motherboards can be upgraded to Y2K compliant by > updating the > >> BIOS which can be "flashed". We had a job we were reworking and it had a > IBM > >> ValuePoint box. We found a BIOS upgrade at IBM's homepage. > > > >Rex Klopfenstein, Jr. wrote: > > > >> Some of the newer motherboards can be upgraded to Y2K compliant by > updating the > >> BIOS which can be "flashed". We had a job we were reworking and it had a > IBM > >> ValuePoint box. We found a BIOS upgrade at IBM's homepage. > >> > >> Larry Cochrane wrote: > >> > >> > If you do buy a used computer, make sure its Y2K compliant. There are a > lot > >> > of motherboards / systems that will not work correctly after > 12/31/1999. > >> > > >> > >> -- > >> Rex Klopfenstein, Jr. > >> Bowling Green, OH > >> rklopfen@......... > >> www.wcnet.org/~rklopfen > >> > >> _____________________________________________________________________ > >> > >> Public Seismic Network Mailing List (PSN-L) > >> > >> To leave this list email listserver@............. with the body of the > >> message: leave PSN-L > > > > > >_____________________________________________________________________ > > > >Public Seismic Network Mailing List (PSN-L) > > > >To leave this list email listserver@............. with the body of the > >message: leave PSN-L > > > > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: ISA CARD FIX Y-2K Date: Wed, 04 Nov 1998 14:05:33 -0700 http://www.jdr.com/jdr.exe Search for y2k 2 results. Two different cards. One is $70 and the other is $90. I doubt most people will need it. What are the odds that an earthquake will happen at midnight Dec 31, 1999? An earthquake that your station would see? I've found a total of one computer that correctly flips over to 2000. It's an Intel motherboard Pentium that I built. It's pretty old too. I couldn't find a direct URL. Their site is totally dependent on the CGI script jdr.exe. Which is odd, because CGI will increase the server load. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Re: DI-150RS limitations Date: Wed, 4 Nov 1998 15:08:26 -0700 (MST) > From: Jim Hannon > You might want to investigate Bsoft http://www.bsof.com/anaprod.htm > products for an inexpensive A/D converter. They probably still need some > software but would not have the timing problems associated with using > the serial port. > For an internal AD, I would get Larry's board. The reason I'm trying to a serial port AD is for K-12 teachers -- many would be hesitant to install a board within a PC and keeping things exterior to the PC also makes system much more portable. I have a draft version of my "Table-Top Earthquakes" demo on the web now, and would love to get feedback for corrections, improvements, etc. The URL is: http://giseis.alaska.edu/lahr/tabletop/ Cheers, JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Wayne Abraham Subject: Telemetry Decode Date: Wed, 04 Nov 1998 19:27:46 -0400 Does anybody know where I can find software that will allow me to decode USGS telemetry received from a scanner into my sound card (if such a thing exists)? Wayne Abraham. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: On-Line Earthquake Education Date: Wed, 4 Nov 1998 16:36:13 -0700 (MST) Speaking of education modules, there is an extensive one on earthquakes developed by the Southern California Earthquake Center. Check out: http://www.scecdc.scec.org/Module/ JCLahr > >Date: Wed, 04 Nov 1998 12:16:31 -0800 > >Reply-To: benthien@............. > >Sender: owner-scecall-l@....... > >From: Mark Benthien > >To: scecall > >Subject: SCEC Regional Seismicity Module Version 1.0 Release > >We are pleased to announce the release of version 1.0 of the SCEC > >web-based education module "Investigating Earthquakes through > >Regional Seismicity". The module is now available at > >http://www.scecdc.scec.org/Module/. > > > >This module has been designed under the unifying concept "The earth is > >constantly changing". The module is designed for use both in the classroom > >(high school and undergraduate levels), as part of an earth-science > >curriculum, > >or standalone, for use by the general public interested in a user-friendly > >resource for basic seismological information. The content and format of > >this module have been reviewed by scientists and educators alike, and > >portions of the module have been field tested in high school and community > >college settings. > > > >Each section of the module consists of a sequence of text "pages" -- with > >explanatory maps, diagrams, and other inline images -- hyperlinked to > >activities, in which students can develop an understanding of the concepts > >in a more interactive way. Many of these activities are, in turn, linked to > >separate on-line resources (e.g. fault maps), and interfaces that provide > >access > >to seismological data archived at the SCEC Data Center. The ability to > >learn about earthquakes using a continuously updated storehouse of latest > >earthquake data provides an educational experience that relates to the > >"real world". > >The modular design allows any future sections to be easily appended. Version > >2.0 of the module will include a second section ("The Distribution of > >Earthquakes"). We anticipate that this section will be available in time > >for the December AGU meeting in San Francisco this year. Plans for further > >development include a section on "Measuring Earthquakes". > > > >In order to ensure that the module will comply with education standards, > >the module is currently undergoing a curriculum review through the > >Education and Outreach office of the Southern California Earthquake Center. > >We have developed a "storyline" for the module, as outlined in the > >attachment (storyline.gif). We hope that this material will be useful > >to educators in the earth sciences, as well as mathematics, physics, etc. > > > >We have made version 1.0 of the module ("What is an Earthquake?") available > >on the Web in order to receive feedback and comments from educators, > >researchers, and the general public on how to improve this site. We welcome > >any input you would like to share with us. We have linked an on-line > >comment form to the module, or you can send comments via direct e-mail > >to "module@.....................". > > > >We hope you enjoy your tour through the module. After the journey, we trust > >that you will be able to save at least some of the residents of Pinevale! > > > >Sincerely, > > > >John Marquis, Katrin Hafner and Egill Hauksson > >Caltech Seismological Lab > >Pasadena, CA 91125 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: STM-8 loop analysis Date: Wed, 04 Nov 1998 20:46:06 -0500 To all: Just finished a major update of "loop2.pdf". Now have the loop gain, and response functions computed and plotted. Was pleased to see that the response agrees with S-T Morrissey's MathCad analysis quite well. Now it's starting to get interesting. Available at: http://members.home.net/nordgren/public/ Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Norman Davis WB6SHI Subject: Re: Telemetry Decode Date: Wed, 04 Nov 1998 18:00:46 At 07:27 PM 11/4/98 -0400, you wrote: >Does anybody know where I can find software that will allow me to decode >USGS telemetry received from a scanner into my sound card (if such a >thing exists)? fftdsp runs continuously but will decode multiple channels. Check my web page under meteors and you will find a link to larry cooks page where the software can be had. Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Well done John Lahr Date: Wed, 04 Nov 1998 20:50:33 -0800 John Lahr wrote: > > > I have a draft version of my "Table-Top Earthquakes" demo on the > web now, and would love to get feedback for corrections, improvements, > etc. The URL is: http://giseis.alaska.edu/lahr/tabletop/ > > Cheers, > JCLahr > ################################## John C. Lahr > ################################# Seismologist I think your title should include passionate educator. I also think most of the URL subjects on the site were originated by yourself. I use your arrival time calculator all the time, and all the other subjects on the site are all very interesting. I'am guessing, but I think your internet activities have stirred the interests of countless thousands of visitors; let alone the extensive person to person activities you have had up in Alaska. Well done John Lahr! Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: ISA CARD FIX Y-2K Date: Wed, 04 Nov 1998 20:02:20 -0800 Dan Yeh. That's where I saw it. Thanks for jaring my mind.-- JDR Microdevices. Barry Dan wrote: > The ISA card for y2k fix was in this months sale paper, from -- I think > the name was either j&r or J&D micro divice in sunnvale ca.. it sold for > 29.95. > in you need the address i will try to find the add. > my wife says i never throw anything away > Dan > - _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "james dunn" Subject: List of world wide quakes Date: Wed, 4 Nov 1998 22:59:16 -0500 To whom it may concern, I recently read an e-mail from Wayne Abraham, of Nov 2, 1998, from the island of Dominica, in the Caribbean, approx 15 deg north Lat., 67 deg west Long. He referred to numerous tremours from the volcanoes in the southern end of the island. Yet when I looked at the list of quakes world wide, on your web site, I did not see any quakes on the list. Why? I tried to send this message from your response page, but was unable to do so, so I elected to use this route. James R. Dunn Pensacola, Florida, USA temporarily in Kalamazoo, Michigan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Telemetry Decode Date: Wed, 04 Nov 1998 20:16:45 -0800 Norman I have used one called Gram 32 or Gram23. It records from a sound card and displays the frequency content vs time. It is quite useful. Barry Norman Davis WB6SHI wrote: > At 07:27 PM 11/4/98 -0400, you wrote: > >Does anybody know where I can find software that will allow me to decode > >USGS telemetry received from a scanner into my sound card (if such a > >thing exists)? > > fftdsp runs continuously but will decode multiple channels. Check my web > page under meteors and you will find a link to larry cooks page where the > software can be had. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Well done John Lahr Date: Wed, 04 Nov 1998 22:30:15 -0700 John- I also think that your open-file is excellent and would recommend that you expand it to include strong motion by doing an experiment with a horizontal sensor mounted on the brick and oriented to be sensitive to motions in the direction of sliding. -Edward meredith lamb wrote: > John Lahr wrote: > > > > > > > I have a draft version of my "Table-Top Earthquakes" demo on the > > web now, and would love to get feedback for corrections, improvements, > > etc. The URL is: http://giseis.alaska.edu/lahr/tabletop/ > > > > Cheers, > > JCLahr > > ################################## John C. Lahr > > ################################# Seismologist > > I think your title should include passionate educator. I also think > most of the URL subjects on the site were originated by yourself. > I use your arrival time calculator all the time, and all the other > subjects on the site are all very interesting. I'am guessing, but > I think your internet activities have stirred the interests of > countless thousands of visitors; let alone the extensive person to > person activities you have had up in Alaska. > > Well done John Lahr! > > Meredith Lamb > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian & Liz Subject: dt2801 support/info Date: Wed, 04 Nov 1998 19:55:34 -1000 I recently bought a Data Translation dt2801 a/d board (without manual), and wondered if anyone else is using this board. I need to get the pin-out diagram of the i/o connector. I'd also be interested in any software to drive this board. There is example software on DT's site, but the examples don't seem to show how to change the input voltage range. Will EMON ever support this device? Any info would be appreciated. TIA Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Stephen & Kathy Subject: Re: DI-150RS limitations Date: Wed, 04 Nov 1998 22:17:50 -0800 John Lahr wrote: > > I have a draft version of my "Table-Top Earthquakes" demo on the > web now, and would love to get feedback for corrections, improvements, > etc. The URL is: http://giseis.alaska.edu/lahr/tabletop/ > > Cheers, > JCLahr Hi John, I too use your arrival time calc and your site for my personal education! I was wondering if you could share an explination as to why the mag vs energy tables have changed so significantly from a few months ago??? They used to show a mag 4 as 15 tons of TNT and a mag 6 as 15,000 tons!! They now show 1,000 tons and 1,000,000 tons!! Was the old table that far off?? Or as is usually the case, did I cross something up somewhere,, again?? Thanks in advance and keep up the good work!! Stephen Mortensen PSN Station # 55 near Pilot Hill Ca. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Pete Subject: Re: dt2801 support/info Date: Wed, 04 Nov 1998 22:25:52 -0800 Ian, Let me know if you have any success? I have the DT2801-A, I called Data Translation, they wanted $50 for the manual! I have not done much with the board as I don't know the pinout? Thanks, Pete Fleming Ian & Liz wrote: > I recently bought a Data Translation dt2801 a/d board (without manual), and > wondered if anyone else is using this board. > > I need to get the pin-out diagram of the i/o connector. I'd also be > interested in any software to drive this board. There is example software on > DT's site, but the examples don't seem to show how to change the input voltage > range. > > Will EMON ever support this device? > > Any info would be appreciated. > > TIA > > Ian Smith > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: PSN - SDR Question? Date: Thu, 05 Nov 1998 00:08:38 -0800 Rex, As Karl points out your min / max seems a bit high. The 16 bit A/D chip I use is spec'ed at an internal noise level of +- 3 bits. This is why I have a note on the A/D card web page about the 16 bit version having a 10X dynamic range over the 12 bit version. The theocratical dynamic range improvement should be 16X. Depending on the location to other boards and the type of computer you are using, your mileage may very... As an example; A 16 bit A/D board placed in an old 486 system will have +-3 to +-4 counts of "background noise" when the inputs are shorted. The same card placed in a 75 Mhz Pentium system will have an extra +- 2 to +-3 bits of noise. I am run into this problem with my "day job". We are doing some contract work on a DSL modem, a new higher digital link into the Internet (more about DSL in an upcoming email...). We have a high speed 16 bit D/A converter card made by National Instruments. We are using the D/A convert as a DSL transmitter on this system, a 233Mhz Pentium. We have another computer system with another A/D card, a Datel 14 bit high speed (5Meg SPS) A/D converter, in it that is acting as a DSL receiver. We are having dynamic range problems... We looked at the output of the 16 bit D/A card, with a scope, and there is almost +-10mv of noise coming out of the card! The card produces +-10 volts max so each bit should be around 300uv. The computer with the A/D card in it (14 bits) also has problems. This system is a 400Mhz Pentium II and the number of background noise counts, with the input shorted, is around +-4 counts so it is no better than a 12 bit card. So for a data logging system an old 486 system works better than an a newer high speed Pentium system. Also, keep the number of other cards in the system down to a minimum. -Larry Cochrane Redwood City, PSN At 08:23 AM 11/4/98 -0800, you wrote: >At 07:10 PM 11/3/98 -0500, you wrote: >>I have just installed my SDR acquisition board (16 bit) into my system >>and now in the process of 'playing'. I have one question. When I place >>a very short jumper between an analog input and analog ground right at >>the plug on the card I would expect to see 0 counts or very close to 0. >>What I do see is a signal that ranges from +3 to -15 or -16 counts using >>the max/min function on the analog count output display. Is this a >>problem? It seems that I have lost the difference between the 12 bit >>and the 16 bit adc! > >Rex -- > >That noise level sounds a little high compared to what I see, but not too >much different. My noise level using just the A/D card runs between +5 to >-5 counts -- about 10 counts total. You can use the zero offset function >in SDR to make your noise symmetrical around zero. You might try plugging >the A/D card into a different slot in the computer. I found that the >least-noisy slot was the one farthest from the hard disk (closest to the >side panel of the enclosure). Also move other plug-in cards as far away >from the A/D card as you can. > >Some noise level is normal. I looked up the specs on the A/D chip and >found that +/- 3 to 5 counts is not unusual. It's too bad that a chip >manufacturer makes a 16-bit part that has such a noise level that makes the >last 2-3 bits unusable without averaging. > >I wonder if there is a better chip that could be used (perhaps for more $) >without circuit or software changes. Larry may have looked into this. > > >Karl Cunningham >La Mesa, CA. >PSN station #40 >karlc@....... > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: PSN - SDR Question? Date: Thu, 05 Nov 1998 02:57:29 -0700 Larry- That's awful. Larry Cochrane wrote: > ... As an example; > A 16 bit A/D board placed in an old 486 system will have +-3 to +-4 counts > of "background noise" when the inputs are shorted. The same card placed in > a 75 Mhz Pentium system will have an extra +- 2 to +-3 bits of noise. > Some things never change. We had these kind of A/D noise problems on the 12-bit systems I first used in 1980. I then thought that they would soon be swept by new technologies, but they have only been enhanced. Making a quiet analog system is an art that must first be accomplished before the Hi-Tech digital leap of faith.-Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Werner Wesling Subject: Re: dt2801 support/info Date: Thu, 05 Nov 1998 14:02:57 +0100 I guess have documentation and s/w for dt2801. I will look for it the next days. When I find it i can send you the info you need. Werner At 06:55 05.11.98 +0100, you wrote: >I recently bought a Data Translation dt2801 a/d board (without manual), and >wondered if anyone else is using this board. > >I need to get the pin-out diagram of the i/o connector. I'd also be >interested in any software to drive this board. There is example software on >DT's site, but the examples don't seem to show how to change the input voltage >range. ---------------------------------------------- Dipl.Ing. Werner Wesling DASA Raumfahrt-Infrastruktur Abtlg. RIO52 Postfach 28 61 56 Phone +49 421 539-5218 28361 Bremen Fax +49 421 539-5127 Deutschland werner.wesling@.......... ---------------------------------------------- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Roger Sorensen Subject: Re: dt2801 support/info Date: Thu, 05 Nov 1998 07:41:35 -0800 I have a JPG file (749k) of the Pin Out Table. If anyone would like it e-mailed to them, drop me a note. Let me know if you want it Zipped or not. Roger roger.sorensen @ worldnet.att.net (take out the spaces) Ian & Liz wrote: > > I recently bought a Data Translation dt2801 a/d board > > I need to get the pin-out diagram of the i/o connector. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Re: dt2801 support/info Date: Thu, 5 Nov 1998 09:09:31 -0700 (MST) There is some IASPEI* software based on the dt2821 a/d board: Lee, W.H.K. (Editor). IASPEI Software Library, Seismological Society of America, El Cerrito, CA, U.S.A., v. 1-5, 1989-1993. See: http://www.seismosoc.org/htdocs/publications.html#software You would need Volume 1 and Volume 2 for a total of $250, plus $100 to become a member of the Seismological Society of America. That's quite a bit, but the software is quite nice. Apart from sismic data inputs, you would want to digitize an IRIG-E time code on one channel. This would give you 15 data channels and one time channel. *International Association of Seismology and Physics of the Earth's Interior This is clearly not an inexpensive route to take... maybe someday the software price will come down. JCLahr > From psn-l-return@.............. Wed Nov 4 22:59 MST 1998 > > I recently bought a Data Translation dt2801 a/d board (without manual), and > wondered if anyone else is using this board. > > I need to get the pin-out diagram of the i/o connector. I'd also be > interested in any software to drive this board. There is example software on > DT's site, but the examples don't seem to show how to change the input voltage > range. > > Will EMON ever support this device? > > Any info would be appreciated. > > TIA > > Ian Smith > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Re: TNT vs EQ magnitude Date: Thu, 5 Nov 1998 09:29:24 -0700 (MST) Hi Stephen, From chemical considerations one can find the amount of energy released per pound of TNT. There is also research that gives an equation for the amount of seismic energy radiated by an earthquake of a given magnitude. It was on this basis that I generated the earlier tables, and it leads to 15 ton of TNT generates the same energy as a magnitude 4 earthquake. However, in the field of bomb vs earthquake discrimination, empirical comparisons of the seismic waves generated by bombs and chemical explosions have been made. This work finds that it takes 1,000 tons of TNT to generate seismic waves that look like a magnitude 4 earthquake. As far as I can understand, this is based on two factors. One, the TNT generates a lot of heat and light that do not contribute to the ground motion, but are counted in the total energy released. And two, an explosion is nearly a point source, whereas an earthquake ruptures over the surface area of the fault. I hate to get into the issue of different magnitude scales, but the 1,000 tons for a magnitude 4 refers to the body wave magnitude, mb. This is a high frequency measure of the earthquake, based on the P-phase arrival. The 20-second surface wave magnitude of 1,000 tons even smaller than 4, because an explosion is a poor source of low frequency waves. There are probably seismologists on this list who can improve on this explanation. If so, please have at it! Cheers, JCLahr > Date: Wed, 04 Nov 1998 22:17:50 -0800 > From: Stephen & Kathy > > ... I was wondering if you could share an explination > as to why the mag vs energy tables have changed so significantly > from a few months ago??? They used to show a mag 4 as 15 tons of > TNT and a mag 6 as 15,000 tons!! They now show 1,000 tons and > 1,000,000 tons!! Was the old table that far off?? Or as is > usually the case, did I cross something up somewhere,, again?? > Thanks in advance and keep up the good work!! > Stephen Mortensen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Re: dt2801 support/info Date: Thu, 5 Nov 1998 10:01:46 -0700 (MST) Ian, The E version is a "fast" time code that requires only 10 seconds of signal for a full decode of the time. Doesn't the "B" code require 60 seconds for a full decode? On GPS time receivers, "IRIG-E" may be an available option. It was for the TrueTime GPS receiver we used in Fairbanks. JCLahr > From macsmith@......... Thu Nov 5 09:29 MST 1998 > ... You mention IRIG-E, I use > the "B" version at work from gps receivers, I'm just wondering what the "E" version > is, and how it is received. > > Thanks. > > Ian > > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: PSN - SDR Question? Date: Thu, 05 Nov 1998 11:05:30 -0800 Larry Cochrane wrote: > Rex, > > So for a data logging system an old 486 system works better than an a newer > high speed Pentium system. Also, keep the number of other cards in the > system down to a minimum. > > -Larry Cochrane > Redwood City, PSN > Larry, Any brand name preferences come to mind? Or....what do you use, and/or what do you wish you used instead? Obviously, people usually don't have a choice with whats available, but sometimes it would pay in the long run to have a more reliable brand in use, than putting up with some brands that consistently are less enduring. I also realize that preferences are often guided by ones experience, so....it would likely just be an opinion. Anyway....if an old 486 could fit the A/D-SDR "bill", this is really good news, as their would seem to be alot more of these available and likely alot cheaper by far than pentium models; with the premise that the specific prospect model actually works before buying. (The following is my relatively inexperienced yak on the subject for interested people)-ha. Also, the operating system on board would have to come under consideration with its space hogging aspects, as older 486's usually have less than 500 meg drives. Perhaps an older Windows system would be better. Won't get into a IBM compatible versus Macintosh choice brew......but reality is, that there are alot more IBM compatibles around. Any prospective (working) computer would have to be big enough to hold the (Internal) A/D card of choice, so, it would also pay to have the card on hand, or, knowing its size, and whether it would fit therein before purchase, and that their is a compatible slot available and/or the cards can be either rearranged or dumped and still have it work.... 1. Is it big enough to hold the card? Check inside. 2. If you don't have the model experience, you may really need the manuel for help, if you don't have zilch experience. The jumpers may have to be re-arranged, and, perhaps a sound card/game card may have to be dumped for room. Even if you do have experience, you may forget...you need the model manuel that does show the specific jumpers, switches, do this, do that before, and etc. Don't depend on getting a manuel from the company....99% won't even have it available. No manuel with specfics; no purchase. 3. Does it actually work now...before conversion? It maynot work after installation, and you may need an experienced friends help for problem resolution. If you get it from a used computer place, perhaps they can install it for a reasonable fee, but even here, they likely won't be cheap, but the risk is that there likely won't be a guarantee of success. 4. Get the help and or experience or manuel info down pat. You do want to succeed. Suggest all 4 of the above, or you maybe stuck with a foot/cat/ dog warmer, or "pet rock" of no value. Yes...it took me over a week to get mine going, along with alot of mistakes-ha. After purchase, use a outlet with a ground connection, otherwise it will do the zap/shutdown dance from static electricity perhaps too often. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: PSN meeting Date: Thu, 05 Nov 1998 17:47:05 -0700 Larry- Probably the best thing would be to schedule the PSN meeting for either Saturday, 5 Dec or Saturday, 12 Dec. My PSN poster and Sean-Thomas' VBB poster are in the same AGU session on Sunday, 6 Dec; Ted&Jan's and John Tabor's PSN posters are in the same AGU session on Thursday, 10 Dec. I may be able to arrange to hold the PSN meeting again, like last year, at the USGS, Menlo Park, CA. -Edward Larry Cochrane wrote: > Ok... Do you think we should schedule another PSN meeting around then??? -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: PSN - SDR Question? Date: Thu, 05 Nov 1998 20:22:54 -0800 At 11:05 AM 11/5/98 -0800, Meredith wrote: >Any brand name preferences come to mind? Or....what do you >use, and/or what do you wish you used instead? I usually don't buy brand name PC's. I go to a small computer shop that I have been going too for years. They sell mostly OEM boards and build up the systems for their costumers. > >Also, the operating system on board would have to come under >consideration with its space hogging aspects, as older 486's >usually have less than 500 meg drives. Perhaps an older Windows >system would be better. If the system is for data logging, SDR and EMON are DOS programs, so the operating system size shouldn't be a problem. -Larry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Northern California PSN meeting in December Date: Thu, 05 Nov 1998 21:23:28 -0800 Edward and other PSN'ers, Since Sean-Thomas and John Tabor will be attending the AGU, maybe we can arrange a date and time when both could attend, if they are interested? Also, how many local (and other list members, if they can attend) would like to have a meeting around the time of the AGU? Having the meeting at the Menlo Park USGS would be great. -Larry Cochrane Redwood City, PSN At 05:47 PM 11/5/98 -0700, Edward Cranswick wrote: >Larry- > Probably the best thing would be to schedule the PSN meeting for either >Saturday, 5 Dec or Saturday, 12 Dec. My PSN poster and Sean-Thomas' VBB poster are >in the same AGU session on Sunday, 6 Dec; Ted&Jan's and John Tabor's PSN posters >are in the same AGU session on Thursday, 10 Dec. I may be able to arrange to hold >the PSN meeting again, like last year, at the USGS, Menlo Park, CA. >-Edward > >Larry Cochrane wrote: > >> Ok... Do you think we should schedule another PSN meeting around then??? > >-- >Edward Cranswick Tel: 303-273-8609 >US Geological Survey, MS 966 Fax: 303-273-8600 >PO Box 25046, Federal Center cranswick@........ >Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Northern California PSN meeting in December Date: Fri, 06 Nov 1998 08:49:59 -0800 At 09:23 PM 11/5/98 -0800, Larry wrote: >Also, how many local (and other list members, if they can attend) would >like to have a meeting around the time of the AGU? > >Having the meeting at the Menlo Park USGS would be great. Larry, and others -- I'd love to attend a meeting. Since it's around the holidays, the time of AGU is not the best for me, I could probably swing it. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: DSL Internet Connection for the Redwood City PSN Site Date: Sat, 07 Nov 1998 19:51:20 -0800 All, A few days ago I ordered a DSL, Digital Service Line, connection into the Internet for my computer systems here at home. As most of you know, I currently have a dedicated (24/7) 28K (connects at 26.4Kbs most of the time) modem phone line connection to my ISP for my web, ftp and email servers at http://psn.quake.net. PacBell, my local phone company, is offering a DSL connection at a price that is only a little more per month than what I am currently paying to my ISP for my 28k connection. PacBell offers different packages with different connection speeds and number of static IP address. I'm starting out with the lowest (read cheapest) connection speed, 128K outgoing and 384k incoming and 5 IP address. The new cost will be $139.00 per month, I'm currently paying $105.00 per month. Startup costs is $500.00, about the same amount I paid several years ago when I got my dedicated 28k modem connection. There is one problem. I'm also changing my ISP. I'm currently using a small ISP called QuakeNet and my DSL line will use PacBell. PacBell, besides operation the point to point connection, can be the ISP. You can choose other ISPs for the DSL connection, but I thought it would be best too keep it within PacBell. Since I will be changing ISP's, I may loose the psn.quake.net domain name. I will see if QuakeNet will keep the psn. part of their domain name (quake.net) for me, but point it to my new IP address that PacBell will be giving me. My current ISP will probably want to charge some fee to do this. The problem is I get email coming to psn.quake.net and all of the search engines have http://psn.quake.net/... in their databases. I have two domain names allocated to me. One is webtronics.com and the other is seismicnet.com. I can create psn.webtronics.com and / or psn.seismicnet.com (or www.seismicnet.com) domain names, that's not a problem. Hopefully QuakeNet will keep forwarding email sent to *@............. and forward the IP address needed so that http://psn.quake.net keeps working without charging too much. The new connection should be installed on Tuesday (11/10). If everything goes well, I should have the Redwood City PSN site on line using the webtronics.com and seismicnet.com domain names later that night using the new higher speed connection. Regards, Larry Cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: taber@............. (John Taber) Subject: Re: Northern California PSN meeting in December Date: Mon, 9 Nov 1998 10:29:07 +1300 Edward, Larry, et al I'd love to come to a PSN meeting while I'm in San Francisco, though the time I'm in California may not work for others. I arrive Saturday 5 December at 3:15 so I could make a late afternoon/evening meeting that day at Menlo Park. I could also come any evening during the week and I leave at 4 PM on Friday 11 Dec. John Taber _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: MAJ QUAKE in progress Date: Mon, 9 Nov 1998 19:01:58 +1300 05:45 UTC 09 nov 98 5000+ dps on SDR large S and Surface waves DAve Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: MAJ QUAKE in progress Date: Sun, 08 Nov 1998 23:15:44 -0800 "David A. Nelson" wrote: > 05:45 UTC 09 nov 98 > > 5000+ dps on SDR large S and Surface waves > > DAve > > Co-ordinator: > New Zealand > Public Seismic Network > Dave A. Nelson ZL4TBN > 24 Jensen St., > Green Is., Dunedin, > South Is.. New Zealand. > > http://psn.quake.net/dave/home.htm > Dave, See it rolling in here also. Long period everything; maybe on your side of the world? Guess we'll find out. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian & Liz Subject: adding an a/d to emon Date: Sun, 08 Nov 1998 20:22:04 -1000 Hi, Does anyone know how easy would it be to add support for an extra a/d card to Emon? I have a Data Translation DT2801. Thanks Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Canie Brooks Subject: Re: MAJ QUAKE in progress Date: Sun, 08 Nov 1998 22:43:29 -0800 Just found this: 09Nov1998 05:38:46.7 6.4S 128.7E 33 mb=6.2 A*NEI BANDA SEA on page: http://seismo.ethz.ch/redpuma/redpuma_ami_list.html Canie At 11:15 PM 11/8/98 -0800, meredith lamb wrote: > > >"David A. Nelson" wrote: > >> 05:45 UTC 09 nov 98 >> >> 5000+ dps on SDR large S and Surface waves >> >> DAve >> >> Co-ordinator: >> New Zealand >> Public Seismic Network >> Dave A. Nelson ZL4TBN >> 24 Jensen St., >> Green Is., Dunedin, >> South Is.. New Zealand. >> >> http://psn.quake.net/dave/home.htm >> > >Dave, > >See it rolling in here also. Long period everything; maybe on your >side of the world? Guess we'll find out. > >Meredith Lamb > > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: MAJ QUAKE in progress Date: Sun, 08 Nov 1998 22:48:51 -0800 Dave Picking it up here in Calif also. Barry David A. Nelson wrote: > 05:45 UTC 09 nov 98 > > 5000+ dps on SDR large S and Surface waves > > DAve > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "J. D. Cooley" Subject: Re: MAJ QUAKE in progress Date: Mon, 09 Nov 1998 02:34:46 -0800 At 10:43 PM 11/8/98 -0800, you wrote: > >Just found this: >09Nov1998 05:38:46.7 6.4S 128.7E 33 mb=6.2 A*NEI BANDA SEA > >on page: >http://seismo.ethz.ch/redpuma/redpuma_ami_list.html > >Canie > Later updated to: 09Nov1998 05:38:44.5 6.8S 128.7E 33 MS=7.0 M*NEI BANDA SEA A BIG one! "JD" >At 11:15 PM 11/8/98 -0800, meredith lamb wrote: >> >> >>"David A. Nelson" wrote: >> >>> 05:45 UTC 09 nov 98 >>> >>> 5000+ dps on SDR large S and Surface waves >>> >>> DAve >>> >>> Co-ordinator: >>> New Zealand >>> Public Seismic Network >>> Dave A. Nelson ZL4TBN >>> 24 Jensen St., >>> Green Is., Dunedin, >>> South Is.. New Zealand. >>> >>> http://psn.quake.net/dave/home.htm >>> >> >>Dave, >> >>See it rolling in here also. Long period everything; maybe on your >>side of the world? Guess we'll find out. >> >>Meredith Lamb >> >> >> >> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: wizard@......... (Rick Jerome) Subject: Re: Telemetry Decode Date: Mon, 9 Nov 1998 13:13:33 -0800 New update to GRAM is available at; http://www.monumental.com/rshorne/gram.html Some nice new features. Still waiting for a way to trigger a save. ---------- > From: barry lotz > To: PSN-L Mailing List > Subject: Re: Telemetry Decode > Date: Wednesday, November 04, 1998 8:16 PM > > Norman > I have used one called Gram 32 or Gram23. It records from a sound card > and displays the frequency content vs time. It is quite useful. > Barry > > > Norman Davis WB6SHI wrote: > > > At 07:27 PM 11/4/98 -0400, you wrote: > > >Does anybody know where I can find software that will allow me to decode > > >USGS telemetry received from a scanner into my sound card (if such a > > >thing exists)? > > > > fftdsp runs continuously but will decode multiple channels. Check my web > > page under meteors and you will find a link to larry cooks page where the > > software can be had. > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: VBB loop response, etc Date: Mon, 9 Nov 1998 20:50:41 -0600 (CST) Brett, I looked at your figures. Nicely done. (I haven't looked at your previous ones because I was unsure if we could read .pdf. But we can with acrobat, which loads as a plugin. Regarding the enhancement of the loop gain at lower frequencies: Steim thought it was necessary, and added it at the output of the displacement detector, as you have suggested. He called it an "inverse filter" in his thesis, but it was actually suggested by Wielandt in 1970. The main purpose is to desensitize the closed- loop response to changes in the mechanical system like damping and free period, which changed by as much as 1/2 to 1%. In practicality this means that the additional LP gain of the loop allows the response to be more tightly controlled by the feedback parameters at long periods without having so much gain (controlled by the "r" value) at short periods that it is unstable and oscillates. However, as your figures show, the change is not enough to grossly change the overall response. In the VBB designs, the filter period is that of the seismometer, 20 or 360 seconds. In your figure, the LP corner is considerably longer than the seis period of 90 seconds. The original VBBs at Harvard did not have the filter installed. I have implemented a different filter as a two pole filter at the output of the VRDT demodulator of 0.47uf with 20k ohms, and a second pole at 1 second in the displacement gain amplifier. Without it the seis audibly humms at about 200 hz. This is not quite the very long period corner that is the inverse filter, but is more in line with keeping Td (the displacement transducer time constant) small enough to avoid phase problems. Td should be less than Rf*C. I actually determined the filter by experiment, mainly trying to maintain adequate short period gain in the data passband without the loop oscillating. (This is some of the "between the lines" documentation I need to complete.) I could try this filter by modifying the displacement gain amp to see if the effect is perceptible in the calibration. But it is probably not necessary since the calibrations do fit the transfer function quite well. But I wonder how it will effect the very long period stability and sensitivity to pressure and tilt (of the horizontal). This might make it worth implementing.. Another parameter I have ignored is the Bo (mechanical damping) of the seis. It is considerable, mostly because of the close fit between the coil and the magnet gap. Also, the aluminum coil form, while not being a closed loop, is providing some eddy current damping. The main effect is that the mechanical Q is low. Regarding the temperature problem, I can only observe that it IS everywhere, However, all my calculated estimates of it come out at only about 10% of the observed effect, and gentle heating of things like the VRDT don't produce anywhere near the effect of any heating of the leaf spring, which you can warm up appreciably just by shining a strong lantern type flashlight on it. (The bimetallic temp comp coil can be similarly tested by shining only a small penlight on it. In fact, one could possibly control the brightness of such a lamp with the position error voltage so as to provide active temperature compensation.) Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: 1908 Tunguska atmospheric explosion web site Date: Mon, 09 Nov 1998 21:17:50 -0700 If you're interested, I made a web site question as to the 1908 Tunguska meteor/comet explosion; as to to actually seeing a seismogram of the event, awhile back. Curiosity thing. A fellow named Andrei E. Zlobin made reference to this site for acouple seismograms, barograms and magnetogram: http://www.orc.ru/~azorcord/page_dat.htm Meredith Lamb -- Meredith Lamb <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Main Web site: http://www.users.uswest.net/~psnseismograph52/Index.html <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: rayv Subject: seismic base material Date: Tue, 10 Nov 1998 18:23:33 -0500 i remember reading an e-mail which indicated someone had a source for granite or stone base material. i cannot find the e-mail. could someone point me to the source? i have looked over the subjects of the previous e-mails and it must be buried in a message some where. thanks. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: seismic base material Date: Tue, 10 Nov 1998 17:31:43 -0700 (MST) On Tue, 10 Nov 1998, rayv wrote: > i remember reading an e-mail which indicated someone had a source for > granite or stone base material. i cannot find the e-mail. could someone > point me to the source? i have looked over the subjects of the previous > e-mails and it must be buried in a message some where. There are always lots of cemetaries around... Just kidding. Check with local quarries and rock suppliers; they are, of course, heavy to ship from out of town. ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: seismic piers Date: Tue, 10 Nov 1998 18:59:04 -0600 (CST) An adequate source of pier material that won't break your back and your wallet is concrete blocks and patio pavers. They are easy to handle and allow a flexible design, and are cemented to the floor and to each other with ordinary floor tile grout. A smooth top surface is made by grouting on 12 x 12" glazed tiles. An alternate plan is to form up and pour a solid concrete pier; but do not use any rebar or steel mesh. Plain "sacrete" will do. We just upgraded the pier at a station near Nashville (WVT) by having the contractor dig a 6' x 8' x 5' deep pit in the floor (the original pier) and fill it with 10 yards of concrete. If a single solid rock slab is used, it should be set with a sand-rich concrete or grout on top of the floor or an excavation in hard earth. The photos of the concrete block pier in my basement are at: http://www.eas.slu.edu/People/STMorrissey/index.html Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gary McCool Subject: Re: seismic base material Date: Tue, 10 Nov 1998 20:33:26 -0500 At 05:31 PM 11/10/98 -0700, you wrote: >On Tue, 10 Nov 1998, rayv wrote: >> i remember reading an e-mail which indicated someone had a source for >> granite or stone base material. i cannot find the e-mail. could someone >> point me to the source? i have looked over the subjects of the previous >> e-mails and it must be buried in a message some where. I believe the granite blocks you are looking for come from "discount" tool sources such as IPS, Harbor Freight, and Chicago tool. They are used as precision flat surfaces for inspection purposes. My IPS catalog lists a "B" grade as large as 8" x 36" X 48". They are in El Monte, CA at 800 423-4981. IPS has an even lower grade "B -0-Ledge" 18" x 24" for 139.95 (thickness unknown) in some of their flyers. Hope this helps... Gary McCool, a lurker with a Lehman Perkins Observatory, Delaware, Ohio _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: seismic base material Date: Tue, 10 Nov 1998 17:38:44 -0800 Ray -- Here is something I wrote on the subject a few weeks ago. Companies that cut granite slabs for surface plates (and other things) sometimes have discards that they cannot use because of inclusions, cracks, etc. I saw one used by an amateur laser experimenter that was about 3' by 6' by 4" thick, weighed about 1000#, and it cost him about $100. The surface wasn't mirror smooth, but as good as a concrete floor. He was trying to isolate his apparatus from earth noise and thus supported the plate with inflated inner tubes. Presumably, setting such a plate in grout could do the opposite. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... At 06:23 PM 11/10/98 -0500, you wrote: >i remember reading an e-mail which indicated someone had a source for >granite or stone base material. i cannot find the e-mail. could someone >point me to the source? i have looked over the subjects of the previous >e-mails and it must be buried in a message some where. >thanks. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: ralvarez@........ (Raul Alvarez) Subject: Re: seismic base material Date: Tue, 10 Nov 1998 18:52:02 -0700 (MST) I sent an e-mail some time ago about using 1-1/4 inch thick synthetic (sp) slate from lab table tops. I got some at a university auction. It's heavy! Have not actuall applied it to use yet. Raul >i remember reading an e-mail which indicated someone had a source for >granite or stone base material. i cannot find the e-mail. could someone >point me to the source? i have looked over the subjects of the previous >e-mails and it must be buried in a message some where. >thanks. > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: FW: Date: Tue, 10 Nov 1998 18:24:33 -0800 > -----Original Message----- > From: Al Allworth [mailto:allworth@............... > Sent: Thursday, October 15, 1998 11:16 PM > To: PSN-L Mailing List > Subject: Suggestion for seismo base > The URL should be http://www.ipstool.com Earlier this year there was a lot of discussion about suitable material for a stable pier for a seismometer mounting. About the same time I bought a granite surface plate but never thought at that time of using one for a pier surface. Granite is very stable and the prices of surface plates has really taken a dive with China now as a supplier. The one I bought was around $90.00. It is 18" x 24" x 3" and weighs 145 lbs. They also have one 12" x 18" x 3" at $30.00 and one 9" x 12" x 3" for $20.00. The surface accuracy is around 0.0001". The company I bought from is Industrial Pipe and Steel in El Monte, Calif. http://ipstool.com I think any machine shop supply company would have them. The American made ones sell for nearly 10 times these prices. Just a thought for those building piers. Al Allworth From: Brett Nordgren Subject: Re: VBB loop response, etc Date: Wed, 11 Nov 1998 09:29:55 -0500 Sean-Thomas, Just to avoid confusing the list, this thread is about some thoughts I'd had concerning the feedback loop, documented in http://members.home.net/nordgren/public/loopmods.pdf (That's not going to get put in the index page so it will have to be accessed directly by its file name.) It might be useful to quickly revisit why I made the suggestion, viewed strictly as a feedback problem. It wouldn't surprise me to hear a crusty old feedback designer complain that any system that doesn't have a loop gain greater than 100 just doesn't deserve to be called a feedback system. All the good rules of thumb depend on high loop gain. The useful approximations (the main one being that performance depends only on the feedback elements) are 99% accurate for loop gain = 100, are 90% accurate for loop gain = 10 and 50% accurate for a loop gain of 2. So, to satisfy the old designer, and gain being cheap, I set out to try to increase the low frequency loop gain. Adding an additional factor of 100 to the displacement amplifier gain looked reasonable. But to avoid creating oscillation problems, I didn't want my changes to affect the original loop much above 1 Hz. So I had to start bringing down the extra gain at 0.005 Hz and then flatten it out at 0.5 Hz, at which point the displacement amp gain is back down to its original value of 10. My intent with the filter was simply to get rid of the gain I'd added, before you got into a frequency region where I might be causing oscillation problems. Regarding the 200 hz hum you were seeing. I'll bet most anything that that it's another mechanical resonance. My reasoning is as follows: 1) the high-frequency loop gain is determined only by the mass and the displacement amp, whose values are well known. They predict gain crossover at about 37 hz. (see http://members.home.net/nordgren/public/ feedback.pdf and loop2.pdf) 2) Any changes to the displacement amp. that I wasn't considering would, if anything, reduce the gain crossover frequency. 3) The oscillation frequency is well above 37 Hz. That's the classic characteric of a high-frequency resonance since unstable loops should oscillate somewhat near their gain crossover frequency. You can imagine that there's a high-Q spike in the loop gain from a mechanical resonance at 200 Hz, which pokes back up above unity. That's a second gain crossover point, and one that has very bad (large lagging) phase. Guaranteed oscillator. If true, I don't know if it's good news or not. Resonances can be nasty to deal with, though there are a number of techniques (like attaching the mass through a rubber pad) that might help, depending on the source of the problem. More damping magnets on the spring? Trying to avoid the problem with poles in the displacement amp, always risks having oscillations somewhere below 37 Hz. One is caught between the two evils. Trying to reduce the height of the resonance, might be the easier line of attack. Really enjoyed hearing about your flashlight temperature testing. It's obvious that it's pretty sensitive. I need to think a lot more about these noise/drift things. Want to totally understand the loop, before digging in that direction. I'd be most interested in what you think. Brett _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Low noise signal cable Date: Wed, 11 Nov 1998 08:21:03 -0800 (PST) I has reading the manual provided with the Dataq DI-150RS a/d module and it had a section discussing the attributes of low noise signal cable: "Four elements combine to ensure adequate quality signal cable: A twisted signal pair with low resistance stranded copper conductors. Surrounded by a multiple-folded foil shield. With a copper stranded drain wire. All contained within an insulated outer jacket. In applications where such signal cable is used, a dramatic decrease in noise pickup will be experienced. The drain wire should be considered as the shield and should be connected as described previously. Signal cable meeting all four criteria for quality is Belden No. 8641." I haven't tried any of this cable(just using standard coax right now), but for those on the list who have built extra sensitive seismometers that require the lowest noise this Belden cable might help any noise problems. Greg Bajuk _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: Low noise signal cable Date: Wed, 11 Nov 1998 12:04:18 -0500 Greg, Another benefit with using shielded twisted pair vs coax is that you can then configure the DI-150RS with differential inputs. I don't know if you're already doing that, but I'd expect differential to be a great improvement over single-ended operation. Brett At 08:21 AM 11/11/98 -0800, you wrote: >In applications where such signal cable is used, a dramatic decrease in >noise pickup will be experienced. The drain wire should be considered as >the shield and should be connected as described previously. Signal cable >meeting all four criteria for quality is Belden No. 8641." > >I haven't tried any of this cable(just using standard coax right now), but >for those on the list who have built extra sensitive seismometers that >require the lowest noise this Belden cable might help any noise problems. > >Greg Bajuk _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: VBB loop response, etc Date: Wed, 11 Nov 1998 09:29:23 -0800 At 09:29 AM 11/11/98 -0500, Brett wrote: >Regarding the 200 hz hum you were seeing. I'll bet most anything that that >it's another mechanical resonance. My reasoning is as follows: Brett, Sean-Thomas -- Borrowing from feedback amplifier design techniques, a way to look for mechanical resonances is to interrupt the feedback and drive the voice coil with a function generator through a large resistor and look at the output of the displacement transducer with an oscilloscope to make a plot of amplitude and phase out to several hundred hertz. Feed a dc current to the voice coil also to zero the displacement transducer. When you plug this measured response into the equations instead of the theoretical second-order mass-spring function, one should be able to look for places where oscillations or ringing might occur. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Speaking of piers Date: Wed, 11 Nov 1998 18:22:41 +0000 I'm getting closer to actually recording earthquakes. I have to depend on the computer for timing until I can afford GPS. WWV doesn't come in too good or something. Do I need a GOOD excuse? I got a GS-11D and Larry's amp is enroute. So I'm thinking about piers and digging and stuff. Which would be better for a geophone? Perched on a pier in a small housing or buried in a PVC pipe with some weights. I'm leaning towards the pier so I can get to the geophone if something goes wrong with the wiring or whatever. I figured it's better to ask before I pour 150 pounds of concrete. I don't think the garbage man would like that in the trash can. If anyone is using a 10 Hz geophone, when I plugged in the GS-11D the noise dropped through the floor. The noise goes up during the day and it goes down at night. Even during the day it's quieter than when I had the 10 Hz plugged in. The GS-11D 4.5 Hz vertical 380 Ohm was $60 US + shipping from GeoSpace. Is Larry on DSL now? I couldn't send this last night. I think he might have pinging denied on his computer, because traceroute found it, but all of the packets were lost when I pinged it. Then again maybe it's all my ISP's fault. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: VBB loop response, etc Date: Wed, 11 Nov 1998 14:25:28 -0500 Karl, Yes, that sounds like just the ticket for smoking out the problem areas. For a quick qualitative look, in many cases you shouldn't even have to open up the loop. With everything operating normally, just connect a 1-10 meg resistor to the voice coil from an oscillator. Hook up a scope to a convenient point in the loop. Then set the signal level so there's no clipping in the loop and just tune around, say, from 2 to 1000 Hz. Resonances (and marginally stable loops) respond with very obvious peaks. There's another technique we used to use with a closed loop, using a passive clip-on AC milliameter probe connected to an oscillator output, as a voltage injection device. Need to look back at some old notes to remember exactly how it worked, but we could easily measure the closed loop gain and phase with the loop still operational. It worked particularly well within a decade or two of gain crossover, which is where you really need to know what's going on. Measuring with the loop active was necessary in our case, because we usually had so much gain that with the loop broken the output would slam to the limit, even if you tried to bias it just perfectly. Brett At 09:29 AM 11/11/98 -0800, you wrote: >Brett, Sean-Thomas -- > >Borrowing from feedback amplifier design techniques, a way to look for >mechanical resonances is to interrupt the feedback and drive the voice coil >with a function generator through a large resistor and look at the output >of the displacement transducer with an oscilloscope to make a plot of >amplitude and phase out to several hundred hertz. Feed a dc current to the >voice coil also to zero the displacement transducer. > >When you plug this measured response into the equations instead of the >theoretical second-order mass-spring function, one should be able to look >for places where oscillations or ringing might occur. > > >Karl Cunningham >La Mesa, CA. >PSN station #40 >karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Walt Williams" Subject: PSN-L: Speaking of piers Date: Wed, 11 Nov 1998 11:51:12 +0000 Hi Greg, >Greg If anyone is using a 10 Hz geophone, when I plugged in the GS-11D the noise dropped through the floor. The noise goes up during the day and it goes down at night. Even during the day it's quieter than when I had the 10 Hz plugged in. >Walt I have a 10 Hz geophone running. I have correlated the day noise as mostly caused by automobiles on the surface streets. At night traffic diminish and so does the noise. When it is quiet at night, (weekends 02:00am), there is little noise, then I will hear a truck coming down the street several blocks over, and I can 'see' it in the data. :) These sensors are tuned for specific bands. Walt Williams, 98.11.11 dfheli@.............. =================================== ------- Forwarded Message Follows ------- Date: Wed, 11 Nov 1998 18:22:41 +0000 From: Greg To: PSN Subject: Speaking of piers Reply-to: PSN-L Mailing List I'm getting closer to actually recording earthquakes. I have to depend on the computer for timing until I can afford GPS. WWV doesn't come in too good or something. Do I need a GOOD excuse? I got a GS-11D and Larry's amp is enroute. So I'm thinking about piers and digging and stuff. Which would be better for a geophone? Perched on a pier in a small housing or buried in a PVC pipe with some weights. I'm leaning towards the pier so I can get to the geophone if something goes wrong with the wiring or whatever. I figured it's better to ask before I pour 150 pounds of concrete. I don't think the garbage man would like that in the trash can. If anyone is using a 10 Hz geophone, when I plugged in the GS-11D the noise dropped through the floor. The noise goes up during the day and it goes down at night. Even during the day it's quieter than when I had the 10 Hz plugged in. The GS-11D 4.5 Hz vertical 380 Ohm was $60 US + shipping from GeoSpace. Is Larry on DSL now? I couldn't send this last night. I think he might have pinging denied on his computer, because traceroute found it, but all of the packets were lost when I pinged it. Then again maybe it's all my ISP's fault. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 17:24:41 -0500 I must be doing something wrong, when I open this link my Acrobat Reader opens and then a blank screen comes up. I have opened other links that work fine with my Acrobat Reader. I have version 3 of Acrobat and 4.5 of Netscape. Any ideas? By the way, if I try to download the pdf file, I get an empty file message from Netscape. Brett Nordgren wrote: > > http://members.home.net/nordgren/public/loopmods.pdf -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 16:14:49 -0700  

"Rex Klopfenstein, Jr." wrote:

I must be doing something wrong, when I open this link my Acrobat Reader opens
and then a blank screen comes up.  I have opened other links that work fine
with my Acrobat Reader.  I have version 3 of Acrobat and 4.5 of Netscape.  Any
ideas?  By the way, if I try to download the pdf file, I get an empty file
message from Netscape.

Brett Nordgren wrote:

>
> http://members.home.net/nordgren/public/

Rex,    knock off the loopnod stuff like above, and then click on it
in the text.  My computer setup has about the same components
programs as yours.  Then it comes up.

Meredith Lamb
 
  _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: seismic base material Date: Wed, 11 Nov 1998 17:12:56 -0700 Karl & Sean-Thomas- "He was trying to isolate his apparatus from earth noise and thus supported the plate with inflated inner tubes. Presumably, setting such a plate in grout could do the opposite." A large mass of pier mounted on some more compliant material such as soil will act like an accelerometer. It will have a response that is flat to low-frequency groundmotions and rolls off above a corner frequency at f**-2 (12 dB/octave) like a 2-pole low-pass filter. Effectively, a seismograph mounted on such a pier will be shock-mounted and also subject to potentially large excitations from the underdamped resonance peak of the pier/substrate system. This is one way on both reducing local, high-frequency cultural noise and, if one is not careful, the high-frequency signals of local seismic events. Just a warning. -Edward Karl Cunningham wrote: > Ray -- > > Here is something I wrote on the subject a few weeks ago. > > Companies that cut granite slabs for surface plates (and other things) > sometimes have discards that they cannot use because of inclusions, cracks, > etc. I saw one used by an amateur laser experimenter that was about 3' by > 6' by 4" thick, weighed about 1000#, and it cost him about $100. The > surface wasn't mirror smooth, but as good as a concrete floor. He was > trying to isolate his apparatus from earth noise and thus supported the > plate with inflated inner tubes. Presumably, setting such a plate in grout > could do the opposite. > > Karl Cunningham > La Mesa, CA. > PSN station #40 > karlc@....... > > At 06:23 PM 11/10/98 -0500, you wrote: > >i remember reading an e-mail which indicated someone had a source for > >granite or stone base material. i cannot find the e-mail. could someone > >point me to the source? i have looked over the subjects of the previous > >e-mails and it must be buried in a message some where. > >thanks. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 19:09:17 -0700 "Rex Klopfenstein, Jr." wrote: > I must be doing something wrong, when I open this link my Acrobat Reader opens > and then a blank screen comes up. I have opened other links that work fine > with my Acrobat Reader. I have version 3 of Acrobat and 4.5 of Netscape. Any > ideas? By the way, if I try to download the pdf file, I get an empty file > message from Netscape. > > Brett Nordgren wrote: > > > > > http://members.home.net/nordgren/public/loopmods.pdf -- > > Rex Klopfenstein, Jr. Rex and Brett, Disregard my last msg.....I can't get it up either. Same result as Rex, with the same programs (Adobe 3, Netscape 4.5). No file/ text/msg therein also. Reload does nothing with loopmods.pdf. Best cure maybe putting it on the index.....BUT....I had problems also with the other similar name file titled loop2.pdf....but AFTER clicking on the others and coming back to the loop2.pdf link, ....then that file came up successfully also. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: seismic piers Date: Wed, 11 Nov 1998 19:21:50 -0800 I would also provide a vapor barrier if your cover doesn't have a bottom. This will prevent moisture migration from the soil beneath. I use a sheet of visqueen directly under the sensor. Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 22:19:33 -0500 To all: Since I installed Adobe Acrobat 3.01 my own Netscape (v4.05) no longer automatically displays anyone's .pdf files on the first try. A quick workaround is to do a "reload/refresh" and the image will come up. I'll try to research the problem and let you know if I find out anything. Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 19:39:22 -0800 Meredith I uploaded loopmods.pdf to the 32bit acrobat reader and it worked for me (w/netscape 4.5) . I got a nice graph when reviewed. Barry meredith lamb wrote: > "Rex Klopfenstein, Jr." wrote: > > > I must be doing something wrong, when I open this link my Acrobat Reader opens > > and then a blank screen comes up. I have opened other links that work fine > > with my Acrobat Reader. I have version 3 of Acrobat and 4.5 of Netscape. Any > > ideas? By the way, if I try to download the pdf file, I get an empty file > > message from Netscape. > > > > Brett Nordgren wrote: > > > > > > > > http://members.home.net/nordgren/public/loopmods.pdf -- > > > > Rex Klopfenstein, Jr. > > Rex and Brett, > > Disregard my last msg.....I can't get it up either. Same result as > Rex, with the same programs (Adobe 3, Netscape 4.5). No file/ > text/msg therein also. Reload does nothing with loopmods.pdf. > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: S-T Morrissey Subject: pier designs Date: Wed, 11 Nov 1998 21:40:50 -0600 (CST) Edward, Thanks for making an important but often overlooked point. Namely that a poorly designed pier is possibly worse than none at all. It might be useful to review some of the relevant tradeoffs involved. Usually a pier is often more of a convenience than a necessity. Ideally, the seismometer should be merged with the local earth so that it is moved about with the passing waves just as the ground moves. Ideally, the seismometer plus cover or enclosure will have the same density as the local earth medium. For practical purposes, I have always aimed at something near a density of 2.5. If the seis is in an ABS pipe, like with telemetry electronics, it could actually be large enough to float, so we always made the contents as compact as possible. Some prefer to install the seis "naked" in the ground if the package is so designed. Most commercial "portable" seis packages, like the L4-C, the Guralps, and the STS-2 triaxial VBB, (I assume you use some of these in your aftershock surveys) actually list the package density. For these units, the main point of the additional installation package pipe or tube or the concrete "puddle" that is placed in the bottom of the installation pit is to provide a very stable reference for the vertical/horizontal alignment of the seis, especially if it is a portable broadband. For larger seismometers that need to be "set up", a pier IS necessary, since final adjustments have to be made with covers removed, etc. The other need for a pier is to isolate the seis installation from very local noise, like the basement floor. This was the case for our WVT station. However, sometimes the floor is the best available site, and the pier is just to get the instruments up off it and into some protective enclosure, and to save the aching back, as in my basement here. Seismograph stations have traditionally used concrete piers, generally made with limestone or other lighter aggregate rather than granite, to more closely match the density of the hard clay subsoil they are built upon. Even in an underground vault, the pier is isolated from the floor with a gap filled with tar or waterproof foam, (which usually ends up leaking anyhow and causing flooding). At my FVM site, the floor IS the dolomite bedrock, so the piers are just 4" high to keep the instruments out of the ever-present water. For the CCM station in the cavern, we dug down through the Roubidoux clay (VEERRY sticky stuff) about 30 cm to find solid rock, and poured a 3' x 4' pier on top of it that was made with about 65 bags of "sackcrete" hauled or walked the 1/4 mile into the cave across the center bars of bicycles. The clay fill in the cave is quite soft and even "ringy" in some areas, so the pier on bedrock was essential. For a pier were the ground surface is quite soft and/or saturated, it is important to get down to competent sub soil, for the reasons Edward has pointed out. A massive slab on top of a sponge is a high frequency filter, and massiveness does not necessarily mean tilt stability. In fact, some sites have aggravated the problem by making the top of the pier much larger than the support under it, making it an unstable inverted pendulum. The height of the pier is just to avoid stooping over to access the sensors, and to accommodate protective shelters. The important point is what it is resting upon; clay that is almost impossible to dig is the next best to actual bedrock. If bedrock is within a meter of the surface, and the budget allows, getting the pier down to it is a major improvement. But many stations have several to tens of meters of fill (clay, volcanics, cherts, etc) under them, and are quite acceptable. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: VBB spring material- revisited Date: Wed, 11 Nov 1998 19:54:03 -0800 Hi All Does anyone know if there might be carbon fiber sheets available that might work for a spring? Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 22:36:44 -0700 Brett Nordgren wrote: > To all: > > Since I installed Adobe Acrobat 3.01 my own Netscape (v4.05) no longer > automatically displays anyone's .pdf files on the first try. A quick > workaround is to do a "reload/refresh" and the image will come up. I'll > try to research the problem and let you know if I find out anything. > > Brett Nordgren > Brett, For myself......it seems like the 3rd go around over 6 hours, seems to have been the charm....it came up with no problem, and no reload attempt made. Have to say, the graphs presentation appearance, is really first class....and beats most material by far than what is normally seen as high quality....even by major firms and their commercial web sites presentations. Yes...the next question is; what are you using? Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ian & Liz Subject: Re: VBB loop response-display problems Date: Wed, 11 Nov 1998 20:37:40 -1000 I can display the pdf without any problems. I'm running netscape 4.05, 128 bit encryption, and adobe 3.01 with windows nt. Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: katera@............ Subject: SNN Subscriber Alert Date: Thu, 12 Nov 98 13:11:18 EST This is an automated letter and is sent to subscribers ONLY. For instructions on how to cancel your subscription please go to the bottom of this page. SNN Subscriber ALERT - November 11, 1998 All prices are in $ US taken at the close of the market November 11/98 The last two stocks SNN profiled have been doing very well and we are providing a brief update of them here today. NuOncology Labs Inc. 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The latest USDI news release (November 9) can be viewed by typing in the symbol (USDI) at: http://quote.yahoo.com Some related sites on the Iridium project and USDI subsidiaries are: http://www.iridium.com http://www.skysite.com http://www.project77.com This notice is an 'SNN Subscriber ALERT', our regular issue (SNN #10) will be going out in the next few days. We expect it to be an exciting issue so please watch for it. Also beginning with SNN #10 we will publish our complete 'track record' to date in each issue. CUSIP NUMBERS Some of our subscribers have requested CUSIP numbers for the stocks we profile in SNN. The official numbers for the above mentioned securities are: NLAB - NuOncology Labs Inc. - CUSIP # 67057T107 USDI - US Digital Communications Inc. - CUSIP # 90332A107 As a subscriber you acknowledge to have read, and completely understand our disclaimer. SNN receives a fee from some of the companies it profiles to disseminate information about them to the public and the brokerage community. The stocks SNN profiles are start up companies with no track record and should be considered a 'high risk' investment. There is a possibility of losing all or part of your investment if you were to purchase them. The complete SNN disclaimer can be viewed by going to: http://3464799143/disclaimer98/ To unsubscribe to this letter please write 'unsubscribe' in the subject line and return to: 24182@....... copyright SNN 1998 From: Edward Cranswick Subject: Re: VBB loop response-display problems Date: Thu, 12 Nov 1998 16:17:52 -0700 I am running Netscape 4.04, NT 4.0 (Build 1381: Service Pack 3), and though the Netscape window is blank, some very sophisticated response plots come up on the adjacent Adobe 3.0 window that opens. My problem is that I don't have the mental wherewithal to understand the meaning of all the graphs ... -Edward Ian & Liz wrote: > I can display the pdf without any problems. I'm running netscape 4.05, 128 bit > encryption, and adobe 3.01 with windows nt. > > Ian Smith > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Brett Nordgren Subject: Re: VBB loop response-display problems Date: Thu, 12 Nov 1998 22:42:56 -0500 Edward, I think you have lots of company. This stuff can look pretty obscure. If you haven't yet, look in http://members.home.net/nordgren/public/ for "feedback.pdf" which should get you started. Then "loop2.pdf", which is a slightly more detailed version of Sean-Thomas' analysis of the loop. That one directly relates to the graphs of the loop modifications you were looking at. I'm planning to keep adding details to either or both of those files in order to expand the analysis and to try to make it easier to understand, so if you're interested, please check back every few weeks. For me, the whole rationale for doing this is to get a handle on how the loop is working and to be able predict the desirability and effects of any design changes. In my experience, cut-and-try design on feedback loops can get very frustrating very quickly. Put in simpler terms; "it's easy to build oscillators". ********************************* Netscape 4 / Adobe Reader fix found at: http://www.adobe.com/supportservice/custsupport/SOLUTIONS/78c6.htm Per their instructions, I changed my Acrobat Reader to a "Helper App." instead of a plug-in. Now it works fine, just like it used to. Good luck, Brett At 04:17 PM 11/12/98 -0700, you wrote: >I am running Netscape 4.04, NT 4.0 (Build 1381: Service Pack 3), and though the >Netscape window is blank, some very sophisticated response plots come up on the >adjacent Adobe 3.0 window that opens. My problem is that I don't have the >mental >wherewithal to understand the meaning of all the graphs ... >-Edward > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Nahhhh....it couldn't be!! Date: Thu, 12 Nov 1998 23:51:12 -0700 Uhhhh.....Sean-Thomas, Have duly noted a questionable discrepancy on one of your schematics. The one marked Figure 7; Schematic of the vrdt bridge, AC amplifier, Demodulator. On the far right about in the middle, just above the "demod to amp" markings. My questionable electronic skills with electronic interpretation, led me to conclude it is an old time drawing of a fuse with upper and lower shunts....but the meaning of the little circles kind of leaves me baffled. Perhaps they stand for zero values...? Perhaps, the true meaning of the symbol lies in a mystic petroglyphic nature? Perhaps, the symbol stands for the basic instincts of a man on the verge of discovering hidden suppressed urges as explained in the texts of Freud? Perhaps, the symbol is meant to stand the test of time, and wait for professional opinions by a amateur archeologist? Anyway....whatever it is, perhaps their is a complex mathematical equation, that could explain it all? Perhaps, you have visited my web martian type seismometer site once too often ? Alas.....maybe.....the true meaning will never be known....ha. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Basic Date: Sat, 14 Nov 1998 09:44:26 -0800 Hi All This is not a directly related quake question but it is related to my acquisition program.. I seem to remember somewhere in my mind that in BASIC programming the INPUT statement had an option to display the previous value at the input prompt. This allowed a simply ENTER to accept the previous data . It also allowed one to review what was previous entered without a second PRINT line. Does anyone recall the command. I can't seem to find it in my Quakebasic info. Thanks Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Basic Date: Sat, 14 Nov 1998 18:09:51 +0000 barry lotz wrote: > in BASIC programming the INPUT statement had an option to display the > previous value at the input prompt. This allowed a simply ENTER to It's not in "Using QBASIC" by Que. Maybe it's a different BASIC than QBASIC though. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Canie Brooks Subject: Re: Basic Date: Sat, 14 Nov 1998 10:28:42 -0800 At 09:44 AM 11/14/98 -0800, barry lotz wrote: >Hi All > This is not a directly related quake question but it is related to >my acquisition program.. I seem to remember somewhere in my mind that >in BASIC programming the INPUT statement had an option to display the >previous value at the input prompt. This allowed a simply ENTER to >accept the previous data . It also allowed one to review what was >previous entered without a second PRINT line. Does anyone recall the >command. I can't seem to find it in my Quakebasic info. > Thanks > Barry Being a programmer, its always been my experience that you have to store the variable in another temporary variable and if the current input is null, then you can replace it with the temporary variable. Canie > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: Mercury Tiltmeter Date: Sun, 15 Nov 1998 20:34:25 +0800 Hi, I've been thinking of making a third seismometer, maybe even a seismometer "tiltmeter". The article from the Scientific American on the mercury tiltmeter seems interesting and should be easy construct. Any view on its performance or construction. Arie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Basic Date: Sun, 15 Nov 1998 07:45:51 -0800 Canie Yes I could do it that way but what I remember was having the previous value located at the position of the input cursor. This cues the person of the previous value without requiring a second line saying what the previous value was. I could get fancy with displaying the value and repositioning the cursor , which is probably what I will do . I just remember a single INPUT command that performed that task. Must have been for a different Basic/Quickbasic version. Thanks for your input Barry Canie Brooks wrote: > > Being a programmer, its always been my experience that you have to store > the variable in another temporary variable and if the current input is > null, then you can replace it with the temporary variable. > > Canie > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: The Leonids meteor shower Date: Sun, 15 Nov 1998 23:21:04 -0700 Hi all, Slightly offbeat from the seismic scene, unless a "big one" hits, is the upcoming peak of the Leonids meteor shower, around 0800 to 1400 UT, November 17th, 1998. Note that NASA has a web site which details a bunch of news relating to the shower. http://www.leonidslive.com/ Weather permitting they are going to launch a high altitude balloon with equipment to where those who download and use a free version of RealVideo Player, can view the transmissions which will be made. This will be done in California, USA. For those not wishing to not do the above, they will have images posted to that web site, from the Aspendell Observatory, weather permitting, with a new image about once every 10 minutes from 0900 to 1400 ut on November 17th. I downloaded the RealVideo Player, and the test video from NASA. The NASA file didn't play clear through, but other RealVideo Software site files did. Use a 200mhz pentium here, but the pictures are kind of jerky......not much better than some years ago..... Supposedly the western Pacific area is likely to see the shower to its full glory. If you're out in the boonies, you maybe able to see the real stuff, but for me in Denver smog......the internet maybe best. Their is other web sites supposedly having "live" views. Use your search under "meteor shower" and go from there. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: DSL Internet Connection for the Redwood City PSN Site Date: Mon, 16 Nov 1998 16:38:41 -0700 Larry- I am going to send you a few bucks to help pay for the upgrade; what's your address? -Edward Larry Cochrane wrote: > All, > > A few days ago I ordered a DSL, Digital Service Line, connection into the > Internet for my computer systems here at home. As most of you know, I > currently have a dedicated (24/7) 28K (connects at 26.4Kbs most of the > time) modem phone line connection to my ISP for my web, ftp and email > servers at http://psn.quake.net. > > PacBell, my local phone company, is offering a DSL connection at a price > that is only a little more per month than what I am currently paying to my > ISP for my 28k connection. PacBell offers different packages with different > connection speeds and number of static IP address. I'm starting out with > the lowest (read cheapest) connection speed, 128K outgoing and 384k > incoming and 5 IP address. The new cost will be $139.00 per month, I'm > currently paying $105.00 per month. Startup costs is $500.00, about the > same amount I paid several years ago when I got my dedicated 28k modem > connection. > > There is one problem. I'm also changing my ISP. I'm currently using a small > ISP called QuakeNet and my DSL line will use PacBell. PacBell, besides > operation the point to point connection, can be the ISP. You can choose > other ISPs for the DSL connection, but I thought it would be best too keep > it within PacBell. Since I will be changing ISP's, I may loose the > psn.quake.net domain name. I will see if QuakeNet will keep the psn. part > of their domain name (quake.net) for me, but point it to my new IP address > that PacBell will be giving me. My current ISP will probably want to charge > some fee to do this. > > The problem is I get email coming to psn.quake.net and all of the search > engines have http://psn.quake.net/... in their databases. I have two domain > names allocated to me. One is webtronics.com and the other is > seismicnet.com. I can create psn.webtronics.com and / or psn.seismicnet.com > (or www.seismicnet.com) domain names, that's not a problem. Hopefully > QuakeNet will keep forwarding email sent to *@............. and forward the > IP address needed so that http://psn.quake.net keeps working without > charging too much. > > The new connection should be installed on Tuesday (11/10). If everything > goes well, I should have the Redwood City PSN site on line using the > webtronics.com and seismicnet.com domain names later that night using the > new higher speed connection. > > Regards, > Larry Cochrane > Redwood City, PSN > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Re: DSL Internet Connection for the Redwood City PSN Site Date: Mon, 16 Nov 1998 19:06:53 -0500 Larry- Count me in too! I can't think of better spent dollars for as much as I use the list. I think I have your address. I have another question- What is the status of the SDR boards? Edward Cranswick wrote: > Larry- > I am going to send you a few bucks to help pay for the upgrade; what's your > address?-- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Another parallel port AD Date: Mon, 16 Nov 1998 17:33:46 -0700 (MST) I just ran across some software for recording seismic data with an Analog Devices AD through a PC parallel port. http://products.analog.com/products/info.asp?product=AD7710 The software can be downloaded from: http://orfeus.knmi.nl/other.services/iaspeipc.html and is called REDSIS. This is a 2-channel system that "employs a sigma-delta conversion technique to realize up to 24 bits" per sample. I haven't tried it, but this could be an alternative to the Radio Shack AD. I'm not sure what just one AD would cost, and the readme file that comes with the unit does not describe how to interface the unit to a parallel port. The author, Ramon Ortiz, might be willing to provide more of the details. **** Also, I spoke to Willie Lee today about the cost of the IASPEI software that uses a Data Translation AD board. He said he would ask the SSA to sell copies to amateur seismologists for $75, and that there would be no need to join the SSA. $75 is less than the cost of printing and distributing the software. This is a 16-channel system that requires one input to be an IRIG-E time signal that can later be decoded to generate the exact time of the data. For PSN use someone would have to write a program to convert to the PSN format. This would only make sense if one finds an inexpensive, used Data Translation AD, model DT2821, as I believe they cost over $1000 each! JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: JIm Hannon Subject: Re: Another parallel port AD Date: Mon, 16 Nov 1998 18:58:20 -0600 John, Analog devices sells an evaluation board for the AD7710 http://www.analog.com/products/eb/support/evaluation_boards/lin_eb/ad7710/ad7710.html if you look at this link you will see a link to a PDF http://www.analog.com/products/eb/support/evaluation_boards/lin_eb/ad7710/pcport.pdf file that describes how to connect to the PC parallel port. I am working on a design for the Burr Brown 24 bit sigma delta part to interface it to a PC parallel port but it will be awhile before I get it built and running. John Lahr wrote: > I just ran across some software for recording seismic data with > an Analog Devices AD through a PC parallel port. > > http://products.analog.com/products/info.asp?product=AD7710 > > The software can be downloaded from: > http://orfeus.knmi.nl/other.services/iaspeipc.html > > and is called REDSIS. This is a 2-channel system > that "employs a sigma-delta conversion technique to realize > up to 24 bits" per sample. > > I haven't tried it, but this could be an alternative to the > Radio Shack AD. I'm not sure what just one AD would cost, and > the readme file that comes with the unit does not describe > how to interface the unit to a parallel port. > > The author, Ramon Ortiz, might be willing to provide more > of the details. > > * > -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Another parallel port AD Date: Mon, 16 Nov 1998 20:31:12 -0700 Some of you guys probably already use or know about it, but I thought a link would be neat to send. http://www.guralp.demon.co.uk/pepp/datasheet.htm Guralp's uses a serial port and comes with about everything you need. I think I read somewhere that it's about $1500. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "jimesler" Subject: Re: seismic base material Date: Mon, 16 Nov 1998 22:50:24 -0600 Take a trip to your local mortician, I got a head stone that was misspelled, it weighs a ton - get some help when lifting one of these babies. Jim Esler -----Original Message----- From: rayv To: PSN-L Mailing List Date: Tuesday, November 10, 1998 5:38 PM Subject: seismic base material >i remember reading an e-mail which indicated someone had a source for >granite or stone base material. i cannot find the e-mail. could someone >point me to the source? i have looked over the subjects of the previous >e-mails and it must be buried in a message some where. >thanks. > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Lahr Subject: Price quote on the Analog Devices AD Date: Tue, 17 Nov 1998 13:51:20 -0700 (MST) Below is the quote for the Analog Devices AD7710 evaluation board. JCLahr > From KARL.TRIEBEL@......... Tue Nov 17 13:28 MST 1998 > From: KARL.TRIEBEL@......... > Date: 17 Nov 1998 13:27:00 -0700 > Subject: Quote for USGS > To: "John C Lahr, Lakewood, CO " > MIME-Version: 1.0 > > > AVNET ELECTRONICS MARKETING > CUSTOMER RESPONSE CENTER > 1-800-272-2724 > > Dear John, > > Thank you for your interest in Avnet Electronic Marketing, and for using > our on line "Request For Quote" system. > > Below please find the pricing and delivery information for the item(s) > requested. > > Reference our quote#: H250 1261577 > > LI QTY PART NUMBER MFG. QTD PRICE DELIVERY DATE > > 01 1 EVAL-AD7710EB ANA 165.00 2-3 weeks > > If you would like to place an order or have additional questions, > please contact us at: > 800-272-2724 Phone Ext.: 3924 > 800-257-0567 Fax > > Or, you may send an e-mail to my attention at karl.triebel@......... > > > Additional Comments _____________________________________________________ > > _________________________________________________________________________ > > _________________________________________________________________________ > > * All orders are subject to Avnet standard terms and conditions. > * All orders are subject to a $100.00 minimum (with each line item being a > $25.00 minimum). > * If quantities quoted differ from quantities requested it is due to minimum > purchasing requirements. > * Any items missing from the original quote are from non-franchised > manufactures. > * Pricing is subject to change. > > > Thank You. > > KARL.TRIEBEL@AVNET > Avnet's Customer Response Center > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Gregory Bajuk Subject: Muddled Mind Date: Tue, 17 Nov 1998 15:58:03 -0800 (PST) I have my standard Lehman under construction and was thinking about what the output signal voltage from the coil represented. Reading the various explanations in the PSN files they seem to say something like this: With no damping the output signal is directly proportional to displacement of the weight. With damping the signal is proportional to the velocity of the weight. Then I thought about the magnet, coil arrangement. A signal is produced only when there is relative motion between the coil and the magnet. With everything at rest, when the system is disturbed by an outside force, this force first accelerates the system, and after a very short time the system has some velocity, and some short time later it has moved a certain amount of displacement. The force of course is varying with time perhaps in a sinusoidal manner which causes acceleration, velocity and displacement to all vary with time. Then when you add damping you have additional time varying feedback forces to think about. Which is why at this point my mind is muddled. Does anyone have a good explanation of why the undamped Lehman signal is proportional to displacement. It seems to me it is the rate of change of displacement(velocity) which is producing the coil output. I'm probably totally wrong here but any help such as what book to read on the subject would be helpful. Greg Bajuk- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Al Allworth" Subject: Re: Muddled Mind Date: Tue, 17 Nov 1998 20:40:24 -0800 Hi Greg, You have the behavior of the coil and magnet close to right. The signal is related to the acceleration. The purpose of the damping is to keep the motion related to the acceleration and not have it swinging after the motion of the earth has stopped. With force feedback the motion of the mass and its damping are all controlled by the characteristics of the feedback system which modifies the behavior of the pendulum according to the design of the feedback system. A completely different set of forces now control the action of the mass. This allows the frequency responce to be flattened over a considerable range and the period to be lengthened. I hope this simple explanation helps. Al Allworth _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Muddled Mind Date: Tue, 17 Nov 1998 21:35:17 -0800 Greg my $0.02 For a Lehman (long period sensor) the displacement of the sensor is related to the displacement of the ground.I look at the beam (body) tends to stay at rest .....while the earth moves. Since what one measures is thru the coil, the output voltage is related to the velocity. If you use a LVDT or other displacement sensor you would be measuring displacement. The above applies to periods shorter than the natural freq. of the sensor. That's why everyone is trying for a longer period sensor. If you have a short(stiff) sensor the displacement would be related to acceleration(accelerometer). This would apply to frequencies below the natural freq. of the sensor. One uses damping around 0.7 to get a reasonable flat output with frequency changes. Regards Barry Gregory Bajuk wrote: > I have my standard Lehman under construction and was thinking about what > the output signal voltage from the coil represented. Reading the various > explanations in the PSN files they seem to say something like this: > > With no damping the output signal is directly proportional to displacement > of the weight. With damping the signal is proportional to the velocity of > the weight. > > Then I thought about the magnet, coil arrangement. A signal is produced > only when there is relative motion between the coil and the magnet. With > everything at rest, when the system is disturbed by an outside force, this > force first accelerates the system, and after a very short time the system > has some velocity, and some short time later it has moved a certain amount > of displacement. The force of course is varying with time perhaps in a > sinusoidal manner which causes acceleration, velocity and displacement to > all vary with time. > > Then when you add damping you have additional time varying feedback forces > to think about. Which is why at this point my mind is muddled. > > Does anyone have a good explanation of why the undamped Lehman signal is > proportional to displacement. It seems to me it is the rate of change of > displacement(velocity) which is producing the coil output. > > I'm probably totally wrong here but any help such as what book to read on > the subject would be helpful. > > Greg Bajuk- > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Northern California PSN meeting in December Date: Tue, 17 Nov 1998 22:07:58 -0800 John and others, Given the tremendous response (1) maybe we won' have a meeting... Maybe what we can do is have a more informal diner get together at a restaurant around here. We could do this sometime during the week when you, S-T Morrissey, Edward, and anyone else who would like too attend, will be here. -Larry At 10:29 AM 11/9/98 +1300, you wrote: >Edward, Larry, et al > >I'd love to come to a PSN meeting while I'm in San Francisco, >though the time I'm in California may not work for others. I >arrive Saturday 5 December at 3:15 so I could make a late >afternoon/evening meeting that day at Menlo Park. I could also >come any evening during the week and I leave at 4 PM on >Friday 11 Dec. > > >John Taber > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: DSL Internet Connection for the Redwood City PSN Site Date: Tue, 17 Nov 1998 22:32:14 -0800 Thanks Edward, My address is: 24 Garden Street. Redwood City, Ca. 94063 At 04:38 PM 11/16/98 -0700, you wrote: >Larry- > I am going to send you a few bucks to help pay for the upgrade; what's your >address? >-Edward > >Larry Cochrane wrote: > >> All, >> >> A few days ago I ordered a DSL, Digital Service Line, connection into the >> Internet for my computer systems here at home. As most of you know, I >> currently have a dedicated (24/7) 28K (connects at 26.4Kbs most of the >> time) modem phone line connection to my ISP for my web, ftp and email >> servers at http://psn.quake.net. >> >> PacBell, my local phone company, is offering a DSL connection at a price >> that is only a little more per month than what I am currently paying to my >> ISP for my 28k connection. PacBell offers different packages with different >> connection speeds and number of static IP address. I'm starting out with >> the lowest (read cheapest) connection speed, 128K outgoing and 384k >> incoming and 5 IP address. The new cost will be $139.00 per month, I'm >> currently paying $105.00 per month. Startup costs is $500.00, about the >> same amount I paid several years ago when I got my dedicated 28k modem >> connection. >> >> There is one problem. I'm also changing my ISP. I'm currently using a small >> ISP called QuakeNet and my DSL line will use PacBell. PacBell, besides >> operation the point to point connection, can be the ISP. You can choose >> other ISPs for the DSL connection, but I thought it would be best too keep >> it within PacBell. Since I will be changing ISP's, I may loose the >> psn.quake.net domain name. I will see if QuakeNet will keep the psn. part >> of their domain name (quake.net) for me, but point it to my new IP address >> that PacBell will be giving me. My current ISP will probably want to charge >> some fee to do this. >> >> The problem is I get email coming to psn.quake.net and all of the search >> engines have http://psn.quake.net/... in their databases. I have two domain >> names allocated to me. One is webtronics.com and the other is >> seismicnet.com. I can create psn.webtronics.com and / or psn.seismicnet.com >> (or www.seismicnet.com) domain names, that's not a problem. Hopefully >> QuakeNet will keep forwarding email sent to *@............. and forward the >> IP address needed so that http://psn.quake.net keeps working without >> charging too much. >> >> The new connection should be installed on Tuesday (11/10). If everything >> goes well, I should have the Redwood City PSN site on line using the >> webtronics.com and seismicnet.com domain names later that night using the >> new higher speed connection. >> >> Regards, >> Larry Cochrane >> Redwood City, PSN >> >> _____________________________________________________________________ >> >> Public Seismic Network Mailing List (PSN-L) >> >> To leave this list email listserver@............. with the body of the >> message: leave PSN-L > >-- >Edward Cranswick Tel: 303-273-8609 >US Geological Survey, MS 966 Fax: 303-273-8600 >PO Box 25046, Federal Center cranswick@........ >Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Muddled Mind Date: Tue, 17 Nov 1998 23:32:44 -0800 At 03:58 PM 11/17/98 -0800, you wrote: >Does anyone have a good explanation of why the undamped Lehman signal is >proportional to displacement. It seems to me it is the rate of change of >displacement(velocity) which is producing the coil output. Hi Greg -- From another muddled mind, I'll give an incomplete and undoubtedly incorrect assessment of the situation from another point of view. I'm very interested in the complete and correct explanation, if any one can fill in the rest... Without damping, the coil's output is unloaded and no current (or at least very very little current) can flow through the coil. When the magnet is moved from one position to another (displacement), it causes a change in the magnetic field. (Or is it a change in the *gradient* of the magnetic field integrated over the area of each coil of wire that matters?) Here's where it gets more muddled: This change in field induces a voltage across the coil, proportional to change in field (or displacement). (More/correct explanation needed?). For some reason I don't understand well (inductance, ??), after the movement stops the voltage can't remain on the coil indefinitely and it decays. For the damped case, there is a resistor shunting the coil and completing a circuit including the coil. The voltage output of the coil is now impressed across the damping resistor, and thus is proportional to the current flowing through the coil and resistor. The current in the coil is proportional to the rate of change of magnetic field which, being the time derivative of displacement, is proportional to velocity. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: lok4@.............. Subject: NLAB News Release Date: Wed, 18 Nov 98 11:02:17 EST Tuesday November 17, 1:05 pm Eastern Time Company Press Release NuOncology Labs Engages EBI Securities VIRGINIA BEACH, Va.--(BUSINESS WIRE)--Nov. 17, 1998--NuOncology Labs Inc. (OTC BB:NLAB - news) announced Tuesday that it has engaged EBI Securities Corp. to provide consulting services and advice to NuOncology Labs concerning business and financial planning, corporate organization and structure, private and public equity and debt financing, acquisitions, mergers and other similar business combinations. EBI Securities, a wholly owned subsidiary of Eastbrokers International Incorporated [Nasdaq:EASEC - news], is headquartered in Rockville, Md. EBI has over 20 offices in the United States and 12 offices located throughout Central and Eastern Europe. NuOncology Labs Inc. participates in the multi-billion dollar cancer treatment research and clinical laboratories industries by supporting the research, development, testing and licensing of cancer treatments along with the delivery of predictive tests for the optimization of contemporary cancer treatment. Additional corporate and financial information regarding NuOncology Labs, Inc. is available through and contained in an information disclosure statement provided to brokers pursuant to Rule 15c2-11 of the Securities Exchange Act of 1934 (the ``Act''). Note: Statements in this document that are not descriptions of historical facts are forward-looking and subject to risks and uncertainties. Actual results could differ materially from those currently anticipated due to a number of factors, including risks relating to the early state of products under development; uncertainties relating to clinical trials; dependence on third parties; future capital needs; and risks relating to the commercialization, if any, of the Company's proposed products (such as marketing, safety, regulatory, patent, product liability, supply, competition and other risks). NuOncology Labs Inc. trades on the OTC Electronic Bulletin Board under the symbol "NLAB". More Quotes and News: Eastbrokers International Inc (Nasdaq:EASEC - news) NuOncology Labs Inc (OTC BB:NLAB - news) Related News Categories: banking, medical/pharmaceutical From: S-T Morrissey Subject: Re: Northern California PSN meeting in December Date: Wed, 18 Nov 1998 17:06:12 -0600 (CST) Larry, Unless something surprising turns up in the next few days, it looks like I will not be able to attend the AGU meeting this year because of a shortage of funds. The meeting in San Francisco is rather expensive, and I don't have the resources to pay my own way as I have done in the past. I have the material for the poster that I submitted an abstract for, but I guess that it will have to keep for some other meeting. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: genn44@................ Subject: NLAB News Release Date: Wed, 18 Nov 98 16:44:44 EST Tuesday November 17, 1:05 pm Eastern Time Company Press Release NuOncology Labs Engages EBI Securities VIRGINIA BEACH, Va.--(BUSINESS WIRE)--Nov. 17, 1998--NuOncology Labs Inc. (OTC BB:NLAB - news) announced Tuesday that it has engaged EBI Securities Corp. to provide consulting services and advice to NuOncology Labs concerning business and financial planning, corporate organization and structure, private and public equity and debt financing, acquisitions, mergers and other similar business combinations. EBI Securities, a wholly owned subsidiary of Eastbrokers International Incorporated [Nasdaq:EASEC - news], is headquartered in Rockville, Md. EBI has over 20 offices in the United States and 12 offices located throughout Central and Eastern Europe. NuOncology Labs Inc. participates in the multi-billion dollar cancer treatment research and clinical laboratories industries by supporting the research, development, testing and licensing of cancer treatments along with the delivery of predictive tests for the optimization of contemporary cancer treatment. Additional corporate and financial information regarding NuOncology Labs, Inc. is available through and contained in an information disclosure statement provided to brokers pursuant to Rule 15c2-11 of the Securities Exchange Act of 1934 (the ``Act''). Note: Statements in this document that are not descriptions of historical facts are forward-looking and subject to risks and uncertainties. Actual results could differ materially from those currently anticipated due to a number of factors, including risks relating to the early state of products under development; uncertainties relating to clinical trials; dependence on third parties; future capital needs; and risks relating to the commercialization, if any, of the Company's proposed products (such as marketing, safety, regulatory, patent, product liability, supply, competition and other risks). NuOncology Labs Inc. trades on the OTC Electronic Bulletin Board under the symbol "NLAB". More Quotes and News: Eastbrokers International Inc (Nasdaq:EASEC - news) NuOncology Labs Inc (OTC BB:NLAB - news) Related News Categories: banking, medical/pharmaceutical From: herby564@....... Subject: NLAB News Release Date: Wed, 18 Nov 98 17:06:22 EST Tuesday November 17, 1:05 pm Eastern Time Company Press Release NuOncology Labs Engages EBI Securities VIRGINIA BEACH, Va.--(BUSINESS WIRE)--Nov. 17, 1998--NuOncology Labs Inc. (OTC BB:NLAB - news) announced Tuesday that it has engaged EBI Securities Corp. to provide consulting services and advice to NuOncology Labs concerning business and financial planning, corporate organization and structure, private and public equity and debt financing, acquisitions, mergers and other similar business combinations. EBI Securities, a wholly owned subsidiary of Eastbrokers International Incorporated [Nasdaq:EASEC - news], is headquartered in Rockville, Md. EBI has over 20 offices in the United States and 12 offices located throughout Central and Eastern Europe. NuOncology Labs Inc. participates in the multi-billion dollar cancer treatment research and clinical laboratories industries by supporting the research, development, testing and licensing of cancer treatments along with the delivery of predictive tests for the optimization of contemporary cancer treatment. Additional corporate and financial information regarding NuOncology Labs, Inc. is available through and contained in an information disclosure statement provided to brokers pursuant to Rule 15c2-11 of the Securities Exchange Act of 1934 (the ``Act''). Note: Statements in this document that are not descriptions of historical facts are forward-looking and subject to risks and uncertainties. Actual results could differ materially from those currently anticipated due to a number of factors, including risks relating to the early state of products under development; uncertainties relating to clinical trials; dependence on third parties; future capital needs; and risks relating to the commercialization, if any, of the Company's proposed products (such as marketing, safety, regulatory, patent, product liability, supply, competition and other risks). NuOncology Labs Inc. trades on the OTC Electronic Bulletin Board under the symbol "NLAB". More Quotes and News: Eastbrokers International Inc (Nasdaq:EASEC - news) NuOncology Labs Inc (OTC BB:NLAB - news) Related News Categories: banking, medical/pharmaceutical From: Doug Crice Subject: Re: Northern California PSN meeting in December Date: Wed, 18 Nov 1998 18:37:38 -0800 The real money is in the hotel and car, airplanes are cheap. Maybe you would like to stay at somebody's house and commute to the AGU? -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Muddled Mind Date: Wed, 18 Nov 1998 19:25:45 -0800 Karl I believe it's Faraday's Law. Induced current is a function of the velocity of the moving wire perpendiular to the magnetic field lines. It's actually that the induced emf is related to the rate of change of flux. Barry Karl Cunningham wrote: > At 03:58 PM 11/17/98 -0800, you wrote: > >Does anyone have a good explanation of why the undamped Lehman signal is > >proportional to displacement. It seems to me it is the rate of change of > >displacement(velocity) which is producing the coil output. > > Hi Greg -- > > >From another muddled mind, I'll give an incomplete and undoubtedly > incorrect assessment of the situation from another point of view. I'm very > interested in the complete and correct explanation, if any one can fill in > the rest... > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: John Hernlund Subject: Re: Muddled Mind Date: Wed, 18 Nov 1998 20:56:41 -0700 (MST) On Wed, 18 Nov 1998, barry lotz wrote: > I believe it's Faraday's Law. Induced current is a function of the > velocity > of the moving wire perpendiular to the magnetic field lines. It's actually > that > the induced emf is related to the rate of change of flux. > Barry Faradays law only expresses the force between two charged particles. The equation for force on a charge moving relative to a magnetic field is a cross product: F = q*(V X B) where q is the charge, V is the velocity vector, and B is the magnetic vector field. Because V = Length/time, the 1/time portion can be factored out so that L is a vector pointing in the direction of the velocity to give: F = q/t*(V X B) = i*(L X B) where i is the current which is defined by q/t. If L and B are everywhere constant and orthogonal (at right angles) then this simplifies to: F = i*L*B If they are not at right angles, but are still a constant value then using the angle "z" between them yields: F = i*L*B*sin(z) Where F is now the force acting on the wire carrying the charge... Ideally, the most emf is induced when the velocity and magnetic field lines are all orthogonal. In real prcatice, this is difficult to achieve. The best way would be to have two rings, one larger than the other and having a gap between them polarized so that the outer portions of each ring are of one polarity and the inside of the other polarity. A coil whose height and range of motion is less than the height of the two rings then go in the gap. The total force exerted between the magnets and the coil is then: F = i*L*B = i*2*pi*r*T*B where r is the radius of the coil and T is the number of turns. (Each turn has a circumference or length equal to L = 2*pi*r). ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: PSN Meeting via the mailing list Date: Wed, 18 Nov 1998 21:43:36 -0700 All, How about a PSN meeting of sorts via the mailing list, say, in the month of December 1998 or even January of 1999? Sure its true we're an ad hoc group with no officials, but with some starting exchange of dialogue of issues, prioritys, aims, preferences, goals and etc., all this could be a nice start.....if enough people really want it? One could go on further with alot of other subjects... Does anyone want this? I'am happy that we have what we have now...but...in the interest of progress, it may not the best option for promoting amateur seismology....or....even keeping what we have now almost seems to somewhat tenuous at times. Perhaps....getting the unheard voices to speak out, may even correct some flaws that maybe a key to a more satisfying tie to this group? I have to admit I had stage fright when I wrote my first msg here.....really! Now....I'am too much at times-ha. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: meredith lamb Subject: Toothbrush charger coil Date: Wed, 18 Nov 1998 22:35:18 -0700 All, Not new per the msg archives;.... but today I dismantled rather quickly a old (circa 1994?) Teledyne Waterpik toothbrush charger base. The coil was plastic encapsulated and was about 1.4" in diameter and with a resistance of 1.2K. The power cord attachment had an plastic extension coming off the coil frame, but it still looks to be useable. It has a number "4" where the cord support extrusion meets the coil plastic. I banged out the center pole with a hammer with no harm. Quite a generator.....with what little tests I did. Maybe a good potential item to look for at yard/garage sales. The plastic encapsulation could mean a long life, even for rugged moist environments. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: Winquake File Format Date: Thu, 19 Nov 1998 16:20:33 +0800 Hi, After a little bit of work, I've managed to get the auto-drum protocol to work. { Australian ). But it returns only an ASCII GSE2.0 format. Can anyone advise me on how to convert the format to "SAC" or "WINQUAKE" format using a DOS machine? I hope to do some minor quake location using the auto-drum stations a my station. Thanks Arie. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: genn44@............ Subject: NLAB News Release Date: Wed, 18 Nov 98 14:54:01 EST Tuesday November 17, 1:05 pm Eastern Time Company Press Release NuOncology Labs Engages EBI Securities VIRGINIA BEACH, Va.--(BUSINESS WIRE)--Nov. 17, 1998--NuOncology Labs Inc. (OTC BB:NLAB - news) announced Tuesday that it has engaged EBI Securities Corp. to provide consulting services and advice to NuOncology Labs concerning business and financial planning, corporate organization and structure, private and public equity and debt financing, acquisitions, mergers and other similar business combinations. EBI Securities, a wholly owned subsidiary of Eastbrokers International Incorporated [Nasdaq:EASEC - news], is headquartered in Rockville, Md. EBI has over 20 offices in the United States and 12 offices located throughout Central and Eastern Europe. NuOncology Labs Inc. participates in the multi-billion dollar cancer treatment research and clinical laboratories industries by supporting the research, development, testing and licensing of cancer treatments along with the delivery of predictive tests for the optimization of contemporary cancer treatment. Additional corporate and financial information regarding NuOncology Labs, Inc. is available through and contained in an information disclosure statement provided to brokers pursuant to Rule 15c2-11 of the Securities Exchange Act of 1934 (the ``Act''). Note: Statements in this document that are not descriptions of historical facts are forward-looking and subject to risks and uncertainties. Actual results could differ materially from those currently anticipated due to a number of factors, including risks relating to the early state of products under development; uncertainties relating to clinical trials; dependence on third parties; future capital needs; and risks relating to the commercialization, if any, of the Company's proposed products (such as marketing, safety, regulatory, patent, product liability, supply, competition and other risks). NuOncology Labs Inc. trades on the OTC Electronic Bulletin Board under the symbol "NLAB". More Quotes and News: Eastbrokers International Inc (Nasdaq:EASEC - news) NuOncology Labs Inc (OTC BB:NLAB - news) Related News Categories: banking, medical/pharmaceutical From: Greg Subject: Re: Winquake File Format Date: Thu, 19 Nov 1998 10:22:55 -0700 Arie Verveer wrote: > it returns only an ASCII GSE2.0 format. Can anyone > advise me on how to convert the format to "SAC" or > "WINQUAKE" format using a DOS machine? You'll need to write a program (for DOS) that reads the ACSII GSE2.0 format and saves the WinQuake format. Larry has the WinQuake format on his website with some C source code at http://psn.quake.net/info/format.txt I know C and C++ OK, so I can help some. I also have a compiler for DOS. I don't have the other format though, and that may be the hardest part about it. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Muddled Mind Date: Thu, 19 Nov 1998 09:57:19 -0800 John -- Thanks for the detailed explanation of the relationship of current, force and magnetic flux. My mind is becoming less muddled the more I read. To continue on... I think there are two related situations: one measuring the voltage across the unloaded coil, and the other measuring the current induced in a low-resistance coil when its output is loaded. I believe your explanation applies to the second scenario, in which a current is induced whenever the closed coil is moved in a magnetic field (even if the field is constant). One must pay attention to the relative directions of the magnetic field and the wire. Now for the first scenario. I dug out my trusty Physics, by Resnick & Halliday (John Wiley & Sons, 1962). It describes a "Faraday's Law of Induction" (p872), which states that the induced emf (voltage) in an unloaded coil is equal to the time rate of change of the magnetic flux times the number of turns. Perhaps this is what Barry was referring to. This would suggest that the voltage across a coil subjected to a moving magnet would be related to the relative *velocity* of the magnet and coil, contrary to Greg's original statement -- >With no damping the output signal is directly proportional to displacement >of the weight. With damping the signal is proportional to the velocity of >the weight. Now trying to relate the first scenario to the second (muddling increasing again): When the coil is loaded (damped), the emf generated by the changing magnetic flux produces a current in the coil which, as it is inside a magnetic field, generates a force on the coil which opposes its movement. If this force is sufficiently small for a given velocity (due to small currents resulting from high total resistance of the coil and damping resistor), the relative motion of the magnet/coil will not be appreciably affected and the voltage across the coil will still be largely proportional to the relative velocity of the coil and magnet. But if the resistances are lower the force will be higher and significantly oppose the relative movement of the coil/magnet. In this case you have more of an accelerometer (as Al Allworth mentioned). As an extreme, the coil can be shorted or better yet paralleled with a negative resistance of the same magnitude. In this case the induced emf causes a high current to flow which almost entirely opposes the force from the inertial mass and you have an accelerometer. The current through the coil is proportional to the force and since F=M*a, also proportional to acceleration. Much like feedback seismometers but the feedback requires no additional circuitry. Am I on the right track yet? Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Winquake File Format Date: Thu, 19 Nov 1998 13:21:35 -0700 Arie- What is "auto-drum" ? Do you meam "auto-drm"? and what is GSE2.0 format, i.e., who makes it? -Edward PS. I spent some time with the question of the high- and low-frequency SG outputs, looking at some records you posted, and I am still puzzling. Arie Verveer wrote: > Hi, After a little bit of work, I've managed to get the > auto-drum protocol to work. { Australian ). But > it returns only an ASCII GSE2.0 format. Can anyone > advise me on how to convert the format to "SAC" or > "WINQUAKE" format using a DOS machine? > > I hope to do some minor quake location using the > auto-drum stations a my station. > > Thanks > > Arie. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: taber@............. (John Taber) Subject: Re: Northern California PSN meeting in December Date: Fri, 20 Nov 1998 12:16:12 +1300 Larry, Getting together for dinner sounds good to me. Maybe we could also invite someone from PEPP and/or IRIS so you, Ed and any others could update them on what the PSN has been doing? John You wrote: >Given the tremendous response (1) maybe we won' have a meeting... Maybe >what we can do is have a more informal diner get together at a restaurant >around here. We could do this sometime during the week when you, S-T >Morrissey, Edward, and anyone else who would like too attend, will be here. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Thu, 19 Nov 1998 17:17:14 -0700 John- I think that that is a good idea to invite some IRIS & PEPP people, although originally I thought it was just going to be family, PSN. So now we have to think about setting a date and a place and how to contact these others. -Edward John Taber wrote: > Larry, > > Getting together for dinner sounds good to me. Maybe we could > also invite someone from PEPP and/or IRIS so you, Ed and any others could > update them on what the PSN has been doing? > > John > > You wrote: > > >Given the tremendous response (1) maybe we won' have a meeting... Maybe > >what we can do is have a more informal diner get together at a restaurant > >around here. We could do this sometime during the week when you, S-T > >Morrissey, Edward, and anyone else who would like too attend, will be here. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Edward Cranswick Subject: Re: VBB loop response-display problems Date: Thu, 19 Nov 1998 18:57:15 -0700 Brett- There was a short period over two decades ago when I understood such things as poles&zeroes in the complex plane and the Z Transform well enough to construct digital filters; unfortunately, since then that understanding has gone down the tubes along with a bunch of brain cells. However, looking at your website inspires me with the hope that -- given a little free time over the holidays -- I may be able to recover some of my former grasp. -Edward Brett Nordgren wrote: > Edward, > > I think you have lots of company. This stuff can look pretty obscure. If > you haven't yet, look in http://members.home.net/nordgren/public/ for > "feedback.pdf" which should get you started. Then "loop2.pdf", which is a > slightly more detailed version of Sean-Thomas' analysis of the loop. That > one directly relates to the graphs of the loop modifications you were > looking at. I'm planning to keep adding details to either or both of those > files in order to expand the analysis and to try to make it easier to > understand, so if you're interested, please check back every few weeks. > > For me, the whole rationale for doing this is to get a handle on how the > loop is working and to be able predict the desirability and effects of any > design changes. In my experience, cut-and-try design on feedback loops can > get very frustrating very quickly. Put in simpler terms; "it's easy to > build oscillators". > > ********************************* > Netscape 4 / Adobe Reader fix found at: > > http://www.adobe.com/supportservice/custsupport/SOLUTIONS/78c6.htm > > Per their instructions, I changed my Acrobat Reader to a "Helper App." > instead of a plug-in. Now it works fine, just like it used to. > > Good luck, > Brett > > At 04:17 PM 11/12/98 -0700, you wrote: > >I am running Netscape 4.04, NT 4.0 (Build 1381: Service Pack 3), and > though the > >Netscape window is blank, some very sophisticated response plots come up > on the > >adjacent Adobe 3.0 window that opens. My problem is that I don't have the > >mental > >wherewithal to understand the meaning of all the graphs ... > >-Edward > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: Re: Winquake File Format Date: Fri, 20 Nov 1998 11:58:20 +0800 Hi Greg Thanks for the offer, I'll probably call on your experience. The change to get raw data from a station nearby is to good to pass by. Here in Western Australia, information is hard to come by and its going to be harder when our geophysical observatory closes down in the next eighteen months. I believe the existing analogue stations are to changed so there information is sent to our eastern states for analysis. I think they are only going to look at seismic info that's magnitude 3 or larger. So I'm motivated to get the "autodrm" data into "Larry's" Winquake program. Regards Arie > > > it returns only an ASCII GSE2.0 format. Can anyone > > advise me on how to convert the format to "SAC" or > > "WINQUAKE" format using a DOS machine? > > You'll need to write a program (for DOS) that reads the ACSII GSE2.0 > format and saves the WinQuake format. Larry has the WinQuake format on > his website with some C source code at > http://psn.quake.net/info/format.txt I know C and C++ OK, so I can help > some. I also have a compiler for DOS. I don't have the other format > though, and that may be the hardest part about it. > > > ,Greg > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: Re: Winquake File Format Date: Fri, 20 Nov 1998 12:12:25 +0800 Hi Edward Sorry I do mean "autodrm" but as yet I don't know anything about the GSE2.0 format other then its a 6 bit compression with second differences. Sounds like fun to decode! A list of Autodrm address can be found at: http://seismo.ethz.ch/autodrm.html When you send "HELP" in the body of the message it returns with instructions. All I've done is send an email message to the Autodrm with about six lines of info and it returns the raw data in this GSE2.0 format. I do have a strong interest in getting this conversion to "Winquake" to work as my local geophysical observatory will probably be closing in the next eighteen months. Regards Arie > Arie- > What is "auto-drum" ? Do you meam "auto-drm"? and what is GSE2.0 > format, i.e., who makes it? > -Edward > PS. I spent some time with the question of the high- and low-frequency SG > outputs, looking at some records you posted, and I am still puzzling. > > Arie Verveer wrote: > > > Hi, After a little bit of work, I've managed to get the > > auto-drum protocol to work. { Australian ). But > > it returns only an ASCII GSE2.0 format. Can anyone > > advise me on how to convert the format to "SAC" or > > "WINQUAKE" format using a DOS machine? > > > > I hope to do some minor quake location using the > > auto-drum stations a my station. > > > > Thanks > > > > Arie. > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@............. with the body of the > > message: leave PSN-L > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Winquake File Format Date: Thu, 19 Nov 1998 21:05:59 -0800 Arie, You may be able to have the autodrm system send you the file(s) in SAC binary or SEED format. WinQuake can read SAC binary and the newest release (V2.5) of WinQuake can read some SEED volumes. -Larry Cochrane Redwood City, PSN At 12:12 PM 11/20/98 +0800, you wrote: >Hi Edward > >Sorry I do mean "autodrm" but as yet I don't know anything >about the GSE2.0 format other then its a 6 bit compression >with second differences. Sounds like fun to decode! > >A list of Autodrm address can be found at: > > http://seismo.ethz.ch/autodrm.html > >When you send "HELP" in the body of the message it >returns with instructions. All I've done is send an email >message to the Autodrm with about six lines of info >and it returns the raw data in this GSE2.0 format. I >do have a strong interest in getting this conversion to >"Winquake" to work as my local geophysical observatory >will probably be closing in the next eighteen months. > > >Regards > >Arie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Greg Subject: Re: Winquake File Format Date: Fri, 20 Nov 1998 05:36:02 +0000 Larry Cochrane wrote: > > Arie, > > You may be able to have the autodrm system send you the file(s) in SAC > binary or SEED format. WinQuake can read SAC binary and the newest release > (V2.5) of WinQuake can read some SEED volumes. Larry might be close to an answer. Check out K3 http://seismo.ethz.ch/autodrm/k3/k3.html It's not there yet though. Also there are some documents about GSE and Autodrm. I'll check them out. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Winquake File Format Date: Thu, 19 Nov 1998 21:52:17 -0800 Arie & Greg -- I have some C/C++ functions that will read and write Winquake-format files. Be happy to share it. I'll put it on my web site and post the URL if anyone is interested. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Arie Verveer Subject: Re: Winquake File Format Date: Fri, 20 Nov 1998 16:42:25 +0800 Hi Karl, Larry Karl, I would be most interested if you could include your C/C++ functions on you web site. I'm sure they would be most useful. Alas I the Australian "autodrm" site only returns GSE2.0 format. Though they do indicate that the GSE2.0 format is only format at this date. Maybe they will include other formats at a later time? So it looks as the only solution is to write some code. Regards Arie > Arie & Greg -- > > I have some C/C++ functions that will read and write Winquake-format files. > Be happy to share it. I'll put it on my web site and post the URL if > anyone is interested. > > Karl Cunningham > La Mesa, CA. > PSN Station #40 > karlc@....... > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Karl Cunningham Subject: Re: Winquake File Format Date: Fri, 20 Nov 1998 14:26:11 -0800 At 04:42 PM 11/20/98 +0800, you wrote: >Karl, I would be most interested if you could include your C/C++ functions >on you web site. I'm sure they would be most useful. Arie -- Looking at my archives I only see code to write Winquake format files, although I remember writing code to read them as well. The difference isn't too significant except that there are two Winquake formats to worry about when reading. Maybe Larry can elaborate, but I think the later format is the only thing used these days. The code I have uses the later format. There are two .cpp files. I'm not sure any more just what the difference between them is. They contain constant information such at latitude and longitude coded into #defines at the top of the program. Check these to be sure you have what you want. The file is on my web site at http://www.jps.net/karlc/lv2wq.zip Have fun, and if you have any questions, please ask. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Ken Navarre Subject: Re: Northern California PSN meeting in December Date: Fri, 20 Nov 1998 16:57:04 -0800 (PST) On Tue, 17 Nov 1998, Larry Cochrane wrote: > Given the tremendous response (1) maybe we won' have a meeting... Maybe > what we can do is have a more informal diner get together at a restaurant > around here. We could do this sometime during the week when you, S-T > Morrissey, Edward, and anyone else who would like too attend, will be here. > > -Larry Let me know when & where and I'll try to be there. Ken _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Rex Klopfenstein, Jr." Subject: Sealing Seismometer Date: Fri, 20 Nov 1998 20:40:44 -0500 I ran across an interesting product today. It is a rubber seal that looks like a tube and can be inflated to seal. It comes in many shapes and retention systems. At first glance it looks like this could be used to seal an inverted aquarium. Strap the inverted aquarium to pier and inflate (with small hand pump) seal. The Presray Corporation 159 Charles Blvd Pawling, NY 12564-1193 914.855.1220 FAX 914.855.1139 http://www.presray.com Request a small 16 page engineering bulletin -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: barry lotz Subject: Re: Muddled Mind Date: Fri, 20 Nov 1998 18:00:59 -0800 Karl Yea- Good old Resnick and Halliday. Barry Karl Cunningham wrote: > > Now for the first scenario. I dug out my trusty Physics, by Resnick & > Halliday (John Wiley & Sons, 1962). It describes a "Faraday's Law of > Induction" (p872), which states that the induced emf (voltage) in an > unloaded coil is equal to the time rate of change of the magnetic flux > times the number of turns. Perhaps this is what Barry was referring to. > This would suggest that the voltage across a coil subjected to a moving > magnet would be related to the relative *velocity* of the magnet and coil, > contrary to Greg's original statement -- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Re: Northern California PSN meeting in December Date: Fri, 20 Nov 1998 18:03:44 -0800 Hi Ken, How are things going? Everythings fine at this end. I'll add you to the meeting list and will let you know when where etc when I find out. Later.... -Larry At 04:57 PM 11/20/98 -0800, you wrote: > > > >On Tue, 17 Nov 1998, Larry Cochrane wrote: >> Given the tremendous response (1) maybe we won' have a meeting... Maybe >> what we can do is have a more informal diner get together at a restaurant >> around here. We could do this sometime during the week when you, S-T >> Morrissey, Edward, and anyone else who would like too attend, will be here. >> >> -Larry > >Let me know when & where and I'll try to be there. >Ken > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: Larry Cochrane Subject: Update on DSL line Date: Fri, 20 Nov 1998 20:13:16 -0800 Hi Everyone, Last week the DSL service was installed in my house. The installation went fine, but the reliability of the connection has been so so... Too monitor the connection, I wrote a simple "C" program that pings (ping is a utility to test the connection to another computer) three IP address. One is my gateway address, this is a router and this tests my connection to PacBell. The other two IP address are computer systems on the net, this tests PacBells connection into the Internet (and the two systems I'm pinging). The program pings all three address every 15 minutes. If all three pings failed the program would log the time and sound an alarm. Yesterday PacBell came out to check the line. They found a problem, so hopefully the connection will stay up. I am slowly migrating things over to the new IP addresses and domain name. This process will take awhile, given the unreliability of the line. I currently have my web/ftp server system responding to both the old address, psn.quake.net (198.68.231.1) on the 28K modem, and the new one at www.seismicnet.com (216.100.224.130) on the new DSL line. When the DSL line is up the increased bandwidth, 384kbs incoming and 128k outgoing, is very nice! Besides the increased speed I also have better connectivity to the net in general. With my old ISP I was having increasing problems viewing a lot of web sites. Either the page would never load or the transfer rate would be below 50 bytes per second and would take forever. I'm still not sure what will happen to the psn.quake.net domain name. www.seismicnet.com should now work and mail sent PSN-L@.............. (or PSN-L@............... should also work. Unfortunately the increase in bandwidth will not be apparent using the new domain name (www.seismicnet.com) until I drop the dial in connection to my old ISP. For some reason the dial in connection is slowing down the DSL connection on my server system. That's it for now. -Larry cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "Kevin J. Rowett" Subject: Re: Update on DSL line Date: Fri, 20 Nov 1998 22:14:41 -0800 At 08:13 PM 11/20/98 , you wrote: >Hi Everyone, > >Last week the DSL service was installed in my house. The installation went >fine, but the reliability of the connection has been so so... Too monitor It's a little late to change now, but, the DSL service from COVAD/Concentric or COVAD/DNAI is much, much better. Same price, less grief. KR _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: robert barns <75612.2635@..............> Subject: 'Quake ident.? Date: Sat, 21 Nov 1998 13:30:45 -0500 Hi gang, what's shakin'? I got a large 'quake which I can't identify. The surface waves arrived= in NJ on 11/19 at about 6:18 UTC. It was about the same size as an M6 at= 8,000 km. = Can anyone tell me what this was? Bob Barns _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) From: "David A. Nelson" Subject: Re: 'Quake ident.? Date: Sun, 22 Nov 1998 10:55:25 +1300 At 13:30 21/11/98 -0500, you wrote: >Hi gang, what's shakin'? > I got a large 'quake which I can't identify. The surface waves arrived >in NJ on 11/19 at about 6:18 UTC. It was about the same size as an M6 at >8,000 km. > Can anyone tell me what this was? >Bob Barns Nothing around that time Bob although there were several events that day and all after the time u have stated. ..... 98/11/19 11:38:14 27.23N 101.00E 33.0 5.6Ms YUNNAN, CHINA 98/11/19 12:03:46 5.20N 126.01E 82.0 5.6Mb MINDANAO, PHILIPPINE IS. 98/11/19 15:39:22 22.78N 125.60E 33.0 5.9Ms SOUTHEAST OF TAIWAN 98/11/19 20:50:31 1.58N 126.28E 33.0 5.6Mb NORTHERN MOLUCCA SEA the Taiwan one was the only one i recorded from here in New Zealand Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: New Public Seismic Network Date: Sat, 21 Nov 1998 16:49:17 -0700 Wayne- I am fascinated by your situation as described in your email, and I am surprised that your post did not get more of a response from the PSN community. My excuse for my delay in responding is that I have been working on our field investigation of recent event in Pennsylvania, the Pymatuning Earthquake . We created that website while we were in the field, and it has proved to be very effective as a point of focus that connects the scientific/governmental community with members of the public community, both those in the region who felt the mainshock and saw the media coverage and those in the immediate epicentral area who experienced strong ground motions and are directly effected by damage to structures or disruption of water wells. The situation you describe with the potential for community involvement in monitoring local seismic activity and other local Earth processes reminds me of the present community awareness in the area of Jamestown and Greenville concerning water-well levels and aftershocks. The formation of a local PSN group on the island of Dominica is the perfect response to the situation you describe: see the abstract (at the bottom of this message) of the PSN presentation we made last year, "Public Seismic Network (PSN): a Model for Preparing People to use Real-time Information About Natural Hazards". Please keep the PSN-L and me informed of developments. I will see if there is any excess USGS equipment that may be useful to you. Can you recommend a website that displays a map of Dominica and recent seismicity? -Edward Wayne Abraham wrote: > Hello, > > My name is Wayne Abraham on the Caribbean island of Dominica. We are > located midway down the island chain, about 500 miles south-east of > Puerto Rico. Dominica (not the Dominican Republic) is an independent > island nation which attained its independence from Great Britain in > November 1978. > > I am not a geologist, seismologist, volcanologist or anything near that. > I am an electrician who got interested in the field because of certain > circumstances. Our island is the most rugged of all the caribbean > islands and we have 10 volcanoes on 289 square miles. We sit on the > Atlantic/Caribbean plate boundry, have the most volcanoes per square > mile and the world's largest boiling lake. Recently there has been an > upsurge of activity in the vicinity of a cluster of volcanoes in the > south of the island. Numerous tremours have been felt by locals and > there has been rockfalls and cracking of concrete structures. The > island's seismic activity is being monitored by the Seismic Research > Unit of the University of the West Indies in Trinidad. I can give more > geologic background information on the island if anyone is interested. > > I was able to get our local amateur radio club, of which I am a member, > interested in setting up a public seismic network where we could share > data from both local and regional events. There is no public seismic > network on any of the islands and most people seem to think that only > professionals can monitor seismic activity. This way of thinking I wish > to change and I have already found 5 members of our club who are willing > to get into actively monitoring seismic events. > > Our problem though is funds. Our club operates on a shoe string budget > and most of the repeater equipment we have on our mountains are donated. > I am looking for anyone who may be able to assist us in getting donated > equipment etc. for our project. > > Your assistance will be greatly appreciated. > > Wayne > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Public Seismic Network (PSN): a Model for Preparing People to use Real-time Information About Natural Hazards Edward Cranswick and Benjamin Gardner (U.S. Geological Survey, MS 966, Box 25046, Federal Center, Denver, CO 80225, USA; 303-273-8609; cranswick@......... Public Seismic Network (http://psn.quake.net/, psn-l@.............. When an earthquake occurs, unlike any other natural hazard, every individual in the population at risk is aware within seconds that a dangerous event has happened. Without the aid of any technology, the consciousness of everyone affected is almost instantaneously focused on the same subject. Instead of soliciting that information, authorities broadcast the redundant message that an earthquake has occurred. A program of monitoring natural hazards for the public requires public participation to effectively mitigate those hazards. The Public Seismic Network (PSN), rather than relegating them to the role of sitting ducks waiting to be devastated by the unexpected, enables people to become aware that earthquakes are part of normal, on-going Earth processes. The PSN is a rapidly growing international group of amateur seismologists, concentrated in California, who record earthquakes with their own digital seismographs and exchange waveform time series and communicate with each other via the Internet. At present, the PSN consists of about 50 seismograph stations, about 250 subscribers to its email list server, and about 10 websites. In urban areas of high seismic risk, a grassroots organization like the PSN -- equipped with low-cost, mass-produced, standardized strong-motion seismographs -- could vastly increase the spatial density of sampling ground motions. This organization would form a constituency of well-informed residents who not only know how to respond to catastrophic earthquakes but also support hazard mitigation programs in the community. Rather than just building faster ambulances to mitigate the impact of heart attacks, it is more effective to modify the public habits of exercise and diet. The PSN is a model for using technology to connect human awareness to, rather than shield it from, the environment. Cranswick, E., Gardner, B. and Public Seismic Network, 1997, Public Seismic Network (PSN): A Model for Preparing People to Use Real-Time Information About Natural Hazards: Eos (American Geophysical Union, Transactions), v. 78, no. 46, p. F46 (AGU 1977 Fall Meeting, San Francisco, CA). Poster is 8’ feet wide, 4’ high -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "J. D. Cooley" Subject: Re: 'Quake ident.? Date: Sat, 21 Nov 1998 15:50:52 -0800 At 01:30 PM 11/21/98 -0500, you wrote: >Hi gang, what's shakin'? > I got a large 'quake which I can't identify. The surface waves arrived >in NJ on 11/19 at about 6:18 UTC. It was about the same size as an M6 at >8,000 km. > Can anyone tell me what this was? >Bob Barns The only one that I found that was even close was: 11/19/98 05:36:12.4 57.41S 25.08W Mb4.5 South Sandwich Islands Region Forgive me for implying this, Bob, but *if* your UTC time was an hour off, then this one might fit: 11/19/98 05:11:49.7 9.99S 139.44E Mb4.8 Arafura Sea The above info is from the International Data Centre. Their magnitudes are almost always lower than that given by the USGS. Other than that, I don't know what you saw. "JD" P.S. I haven't tried to figure if the S-wave arrival times would match, so please... NO FLAMES!! Just trying to help! _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: taber@............. (John Taber) Subject: Re: Northern California PSN meeting in December Date: Sun, 22 Nov 1998 13:32:14 +1300 Larry, What is the best evening for you? Would you be willing to come up into the city? I think you should just choose a time and place and then let people know. It's probably simpler if we don't try inviting PEPP & IRIS people, because as Edward says, it would shift the focus. It was just a thought if no one other than you, me and Edward were going to be able make it, but fortunately it looks like some others will be able to come. I'd just like to finally meet you and thank you for for all the work you have done. John Larry wrote: >Not sure how we will workout all of the details, but it sounds good... Edward Wrote: >I think that that is a good idea to invite some IRIS & PEPP people, although >originally I thought it was just going to be family, PSN. So now we have to >think about setting a date and a place and how to contact these >others. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: robert barns <75612.2635@..............> Subject: 'Quake ident. Date: Sat, 21 Nov 1998 20:09:03 -0500 Hi gang, Never mind about my query about a 'quake on 11/19. It looks remarkably= like part of a 'quake but the FFT of my record shows that it resembles no= other 'quake. I am convinced that the amplifier (home-made, not Larry's)= was acting up. = Bob Barns _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Networked SDR under DOS Date: Sun, 22 Nov 1998 18:08:55 +0000 I've been piddling with this for a while now. I finally have a small solution. I have two computers with network cards. One runs SDR on MS-DOS 6.22 with WFW 3.11 installed, but not running. The other is a dual boot to either Windows 95 or Linux. Under Linux I have it running a FTP server as well as a bunch of other junk. I just ran across a solution that lets me send event files from the SDR DOS shell. It's all free. My netork card in the DOS/SDR computer is a el cheapo NE2000 clone so it's supported, but there is decent selection to choose from. Especially 3Com cards. What you need to do this: 1. two computers networked together (one for SDR and the other to recieve the file) 2. an FTP server (mine runs WU-FTP, but I'm going to look for a Win95 FTP server also) 3. WATTCP. The file I eventually got was apps.zip. apps.zip is the precompiled binaries, so you don't need any programming. You do need to write a configuration file, which is very easy. The FTP client is a seperate file called ftp.zip. 4. A packet driver for your SDR computer network card. I'm using ne2000.com? It's a little harder to configure than the WATTCP file, but it's not really hard. In my autoexec.bat I added "C:\BLAH\NE2000 0x60 11 0x340" That's it. It runs as a 4k TSR. It also loads into high memory with memmaker. This is supposed to work with really old computers also, but it might be a big load on the CPU. That's it. I can now shell to DOS while SDR is running and log into the FTP server to send the file. Unfortunatly there's no WinQuake on Linux. Next step is the Win95 FTP server obviously. Keep in mind that this is TCP/IP only. The SDR machine doesn't have a FTP server and you only have 4 minutes to send the file, before SDR loses data (I think that's right). Or you could keep using floppies. ;) There is also a telnet server for WATTCP called TELNETD.EXE. I haven't tried it, but it might be possible to telnet into my SDR computer and FTP back to the other computer the event file. Confused? I am. I downloaded WATTCP (apps.zip) and the packet drivers (drivers.zip) from the internet. I have the bookmarks on Windows 95, but if you search for them you might get lucky. I also tried Caldera DR-DOS 7.02. It's a waste of money in my oppinion. It's $36 for the CD-ROM version with networking, but it only seems to like Netware servers. Caldera also make Linux for Netware, but that's excessive. If I exit SDR I can connect to Win 95 or Linux with WFW 3.11. But that means losing data. Another solution that might work is Lantastic for TCP/IP. I wasn't going to bet $120 on it though. 'thought some people might want to know, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: David Josephson Subject: Re: Networked SDR under DOS Date: Sun, 22 Nov 1998 14:15:06 -0800 (PST) Greg writes > Another solution that might work is Lantastic for TCP/IP. I wasn't going > to bet $120 on it though. I bought a bunch of IBM PCMCIA wireless network cards a while ago for a project that I never had time to do, but might be a solution for all this, if you are running on DOS or WFW machines with PCMCIA sockets. At the moment there are no Linux drivers (but see www.sector13.org for some current efforts) But each one is bundled with a complete Lantastic (6.0 I think) package including a book. I paid $35 each, I have 15 of them (3 boxes of 5) in original retail packaging if people want some. I believe there are Win 95 drivers on the IBM networks site, search for the "IBM Wireless LAN Entry" card. It is a 2.4 GHz spread spectrum thing that does about 300 kbit/sec with a range of about 200 feet, but with some hacking to connect it to an external antenna will apparently go much further. I am in San Jose and would prefer that you pick the cards up if you want them, but the 5-packs are boxed for shipment and would send UPS at cost if you want. -- David Josephson / Josephson Engineering / San Jose CA / david@............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ian & Liz Subject: Re: Networked SDR under DOS Date: Sun, 22 Nov 1998 13:28:53 -1000 Hi, I read your email a few times, but I'm still a little confused as to what the driving force is behind your described configuration. It sounds like you want to junk windows, but is this because Linux is much better, dos being a compromise? I would have thought that Emon would have run quite happily with windows fwg. Have you checked out the dos networking commands, net start etc? I'd love to run linux on my seismic pc, but I'd have to install tcp on it and the other windows pc to store data, some one please correct me! I'd also loose the ability to run Emon, unless I dive into Linux's dos emulator. So, I just run windows fwg on the seismic pc, and its disks are mapped on the other pc running windows nt. I use filemanager to transfer data around, no messing with ftp. Windows on the seismic pc is a drain on its 486dx muscles, but it isn't doing anything else anyway, and doesn't run out of steam. The only thing I haven't cracked yet, is keeping the clock accurate, most time utilities have to have access to the network via tcp. I feel I've missed the point... Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Multi-channel A/D for Moscow Date: Sun, 22 Nov 1998 17:09:10 -0700 PSN- I received the following message from a friend/colleague, Dr. Leonid Baransky, in Moscow at the Institute of Physics of the Earth (IPE). A few years ago, when we were trying to establish the PSN in Russia (a project conceived by Ted Blank and the Russian woman, Anya Pliasova-Bakounina, to whom I was then married), Leonid was acting as a liason between the IPE and PSN. I have not followed the recent PSN-L discussion of digitizers, etc., in detail, and I thought that someone might know of some hardware with the specs that Leonid gives below. -Edward > I have one request to You.In the frame of one scientific project our > Institute need to buy autonomous(supplied by accumulators) digital > multichannel station for collection 24 geophisical analog signals(from > magnetometers,seismometers etc) and digitizing them(maximum frequency of > geophisical signal in each channel no more than 30hz,dynmamic range of >  signals<120db).Then this digital data must be transmited by a long cable > (500-1000m)to the radio-transmiter. If You know something about such > station and if it will be not difficult for You please send me correspon- > ding technical information (with total price) or please show me any source > of such information(in INTERNET for example). > > -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ian & Liz Subject: Re: Multi-channel A/D for Moscow Date: Sun, 22 Nov 1998 16:17:41 -1000 Hi, take a look at http://www.dghcorp.com/index.htm We use these devices in our telescopes (http://www.jach.hawaii.edu) for things like strain gauges and inclinometers, indeed I was just checking one on Friday! They are a/d convertors which are controlled by a RS485 bus. It can drive up to 4000 feet. At the other end is a RS 485/232 convertor and some intelligence. Hope that helps Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Test Date: Mon, 23 Nov 1998 01:22:42 -0800 Just doing some testing. No need to reply. -Larry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Test 2 - sorry! Date: Mon, 23 Nov 1998 01:35:40 -0800 Just doing some more testing. No need to reply. -Larry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Brett Nordgren Subject: Re: VBB loop response Date: Mon, 23 Nov 1998 10:59:02 -0500 Edward, I'm glad that you feel there might be something helpful for you on my Web download page. Like you, I'm a bit rusty on this stuff, and one of the main reasons I'm writing these is to get it all back into my head. Here's another one that I've been working on. It is a short tutorial on complex variables as required for the loop analysis. It's the file "complex.pdf" available for download at http://members.home.net/nordgren/public/ I've also added a couple of Burr-Brown Corporation application bulletins which were written for op-amp designers. However, they also have a whole lot of really good information on general feedback theory. My other files are being added to sporadically, so if you are interested in any of the others, watch their Update dates. Hope this helps. More to come as I can get it done. Good luck, Brett At 06:57 PM 11/19/98 -0700, you wrote >Brett- > There was a short period over two decades ago when I understood such things >as poles&zeroes in the complex plane and the Z Transform well enough to >construct digital filters; unfortunately, since then that understanding has >gone down the tubes along with a bunch of brain cells. However, looking at your >website inspires me with the hope that -- given a little free time over the >holidays -- I may be able to recover some of my former grasp. >-Edward _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: Networked SDR under DOS Date: Mon, 23 Nov 1998 13:40:55 -0700 Ian & Liz wrote: > I read your email a few times, but I'm still a little confused as to what > the driving force is behind your described configuration. I'm a confusing person by nature. It seems to be contagious. ;) I'd like to leave the floppies on the shelf collecting dust, where they belong. I have all of the network hardware and it's installed. It's just a matter of the software. > It sounds like you want to junk windows, but is this because Linux is much > better, dos being a compromise? I would have thought that Emon would have > run quite happily with windows fwg. I would like to ditch Windows, but mostly to recover the disk space. Linux is known for it's super long uptimes and built it networking. Also Linux is a lot cheaper than anything else. If you spend enough time online you can download it for free and most Linux people will let/help you install it on your computer with their disks. It's very legal to install on as many computers as you want, unless the disk manufacturer includes a license to some commercial application. > Have you checked out the dos networking commands, net start etc? Yes. They only work with IPX (I think) and they won't let you share anything with DOS. You have to be in Windows to share something. > I'd love to run linux on my seismic pc, but I'd have to install tcp on it > and the other windows pc to store data, some one please correct me! I'd > also loose the ability to run Emon, unless I dive into Linux's dos emulator. Linux runs TCP/IP native. You can add other protocols like IPX/SPX and Appletalk. TCP/IP is so easy though, it's a waste to go through all of the effort when you don't need to. As though Linux is easy. You might have to recompile the kernel to add IPX/SPX or Appletalk. Some kernels are modular and you can just load the drivers while it's running. No rebooting required. I can mount Windows ahares with Linux without installing additional support into the kernal. I have TCP/IP installed on my network though. I don't know if EMON would run on DOSEMU. I kinda like SDR anyway. No offense to Ted (EMON author's name?). > So, I just run windows fwg on the seismic pc, and its disks are mapped on So EMON runs under Windows? > The only thing I haven't cracked yet, is keeping the clock accurate, most > time utilities have to have access to the network via tcp. Larry has a web page with info on how to connect a GPS receiver to SDR. I don't know if EMON uses the system clock. If it does there are at least a couple serial port time sources. GPS, WWVB and there are always those nice rack mounted atomic clocks that WWV uses. ;) Someone posted with a small cheap clock that has a serial port to sync the system clock with WWV. I think it was about $70 from some weather instrument maker? A friend of mine is using his computer as GPS network time server and a programming computer. It's a big load, but he has a really fast computer. I did find a FTP server for Windows 95. It's freeware. It's called WAR-FTP and it's on tucows. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ian Smith Subject: Re: Networked SDR under DOS Date: Mon, 23 Nov 1998 11:35:20 -1000 Hi, just to cover a few points in your reply: Yes Linux is great, but I'm sure it will take up (a little) more room than windows, probably around 50 Mbytes for a minimum installation, and 2*physical RAM as a swap partition. All being well, you shouldn't need any help to install windows ;-) DOS networking does "work" with netbui(or whatever it's called), but is quite restrictive and a pain. Tcp of, course requires that it be allocated an ip number. When my main pc connects to the internet, it is assigned one by the ISP, and is different each time I log on. I'm not sufficiently up on networking to mix this with my own fixed and invented ip number which I would have to allocate to the seismic pc. This may be trivial to configure. Almost any DOS program will run under windows, in fact, isn't windows a dos program?. So, if you are short of time, use windows. If you have time to spare, set up a linux system, which will be far superior, faster, free, fun... cheers Ian _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: Re: Multi-channel A/D for Moscow Date: Mon, 23 Nov 1998 20:51:57 -0600 (CST) Edward, A very competent stand-alone digitizer package is the Hewlett Packard HP 34970A Data Acquisition Unit. It can provide 20 channels of 22-bit data for $1700 at a rate of 60 channels/second (ie 3 samples/sec if all 20 chan are scanned). A different multiplexer can run 250 chan/sec for 16 channels. The system can handle three such multiplexers. It can be set up with its own front panel buttons and display, and it also comes with software to interface it with a 486 PC w. Windows. It has a real time clock, but I do not know how accurate it is. It functions as a real multimeter, (volts, amps, ohms, etc), so almost any data can be interfaced easily. It stores 50 000 readings in non-volitile memory: you can take it to the PC to dump the data if necessary. But this is a true stand-alond system that can send data to a remote location. http://www.hp.com/info/bidaq3; or call direct: 1 800 452 4844 For the Moscow requirement of 1 km data transmission over long wires, the RS232 port can be converted to RS 486 (a 2-pair or 4-wire system) or short haul two wire (one twisted pair) modems can be used at each end, such as the TELEBYTE model 203, which can go 2km on #22 wire at 19.2 kbaud for $82 per each end. TELEBYTE has many options for getting data over short (Kms) distances, all costing around $100 for each end. http://telebyteusa.com or call 1 800 835 3298 There are, of course, quite a few digitizers that use a PC for the main system. A recent new system is from IOTECH, which they call the "Personal Daq", which gets 22 bits at 3 samples/sec on 10 channels or 19-bits at 25 sps for $700. 20 channels costs $1k. It has to be supported by a PC, and plugs into the PC com port for power. I doubt that there can be 1km of wire between it and the PC. Telebyte makes a 4-wire short haul modem (model 201) just for the PC com port. http://www.iotech.com Hopefully this will help Leonid. I can appreciate the difficulty of getting such things over there; I was in the USSR exchange program (for Nurek and Totogul: induced seismicity) in the late 70s. We stayed in Moscow for a week or so each time we went to Tadjikistan or Kirgisia. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: Re: Multi-channel A/D for Moscow Date: Mon, 23 Nov 1998 20:51:57 -0600 (CST) Edward, A very competent stand-alone digitizer package is the Hewlett Packard HP 34970A Data Acquisition Unit. It can provide 20 channels of 22-bit data for $1700 at a rate of 60 channels/second (ie 3 samples/sec if all 20 chan are scanned). A different multiplexer can run 250 chan/sec for 16 channels. The system can handle three such multiplexers. It can be set up with its own front panel buttons and display, and it also comes with software to interface it with a 486 PC w. Windows. It has a real time clock, but I do not know how accurate it is. It functions as a real multimeter, (volts, amps, ohms, etc), so almost any data can be interfaced easily. It stores 50 000 readings in non-volitile memory: you can take it to the PC to dump the data if necessary. But this is a true stand-alond system that can send data to a remote location. http://www.hp.com/info/bidaq3; or call direct: 1 800 452 4844 For the Moscow requirement of 1 km data transmission over long wires, the RS232 port can be converted to RS 486 (a 2-pair or 4-wire system) or short haul two wire (one twisted pair) modems can be used at each end, such as the TELEBYTE model 203, which can go 2km on #22 wire at 19.2 kbaud for $82 per each end. TELEBYTE has many options for getting data over short (Kms) distances, all costing around $100 for each end. http://telebyteusa.com or call 1 800 835 3298 There are, of course, quite a few digitizers that use a PC for the main system. A recent new system is from IOTECH, which they call the "Personal Daq", which gets 22 bits at 3 samples/sec on 10 channels or 19-bits at 25 sps for $700. 20 channels costs $1k. It has to be supported by a PC, and plugs into the PC com port for power. I doubt that there can be 1km of wire between it and the PC. Telebyte makes a 4-wire short haul modem (model 201) just for the PC com port. http://www.iotech.com Hopefully this will help Leonid. I can appreciate the difficulty of getting such things over there; I was in the USSR exchange program (for Nurek and Totogul: induced seismicity) in the late 70s. We stayed in Moscow for a week or so each time we went to Tadjikistan or Kirgisia. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: Multi-channel A/D for Moscow] Date: Mon, 23 Nov 1998 23:26:31 -0700 PSN- I would like to thank all those who have responded to my request for information about a "Multi-channel A/D for Moscow" (see message below). In particular, the following people have so far replied: Ian & Liz "PC Systems Design" S-T Morrissey I have forwarded your email to Leonid at: "Leonid Baransky (Vladimir A. Gladychev)" and you should be able to send information directly to him at that address. PS. Leonid, if you have not done it already, you should look at the Public Seismic Network site: http://psn.quake.net/ -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". PSN- I received the following message from a friend/colleague, Dr. Leonid Baransky, in Moscow at the Institute of Physics of the Earth (IPE). A few years ago, when we were trying to establish the PSN in Russia (a project conceived by Ted Blank and the Russian woman, Anya Pliasova-Bakounina, to whom I was then married), Leonid was acting as a liason between the IPE and PSN. I have not followed the recent PSN-L discussion of digitizers, etc., in detail, and I thought that someone might know of some hardware with the specs that Leonid gives below. -Edward > I have one request to You.In the frame of one scientific project our > Institute need to buy autonomous(supplied by accumulators) digital > multichannel station for collection 24 geophisical analog signals(from > magnetometers,seismometers etc) and digitizing them(maximum frequency of > geophisical signal in each channel no more than 30hz,dynmamic range of >  signals<120db).Then this digital data must be transmited by a long cable > (500-1000m)to the radio-transmiter. If You know something about such > station and if it will be not difficult for You please send me correspon- > ding technical information (with total price) or please show me any source > of such information(in INTERNET for example). > > -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Edward Cranswick Subject: Re: PSN and RESINE Date: Tue, 24 Nov 1998 00:01:15 -0700 Luis- I think your plan to have a live presentation as an introduction of the PSN is excellent. I would very much like to help you host this program by answering questions, however, I plan to be in Hawaii at that time. I talked about your plan with John Lahr, and he suggested that having several PSN people participating and answering questions would be a good alternative to just one designated person. I looked at the Resine website , and I am impressed by the records of earthquakes that you have already compiled. I am interested to see how your plan advances, and I hope that I can assist you. -Edward Larry Cochrane wrote: > Edward, > > Can you help out Luis Torres in Portugal with this? I won't be around on > the 27th and he would like someone from the PSN to email (or IRC) questions > too during his talk. Luis is in the process of setting up several station > using SDR. Below are his emails too me about this. > > Luis; If Edward can't do it, I would send an email out to the PSN-L list > explaining your request. I'm sure someone on the list can help. > > Thanks, > > -Larry > > >From Luis on 10/20/98: > > >Now within Resine I plan to have a first national meeting in Lisbon on 27th > >November, and would like to count on your cooperation. I want the students > with > >the help of teachers to have their HTML pages with a description of their > stations > >readily available. Than at say 8h your time each of the 5 schools would > email you > >their page and one question about PSN. This would be projected in a big > >screen. Maybe IRC would be better... > > >Then you would integrate Resine (6 stations in mainland Portugal) in PSN. We > >have our pages in http://geomist.igm.pt/resine (not yet in English and under > >major reorganization, but would be ready early next month). this would be > >important because the students would feel proud about their installations > and > >would be an incentive to keep them going. A number of discussions on > >seismology , civil protection, emergencies, etc will take place with > experiments > >on liquefaction, faulting, building colapse, etc, going on teachers and > students. I > >expect about 60 people. Could I count on you on this official launch of > Resine, as > >a PSN affiliate?. > > >From: torres@...... > >To: "Larry Cochrane" > >Date: Fri, 20 Nov 98 19:43:48 > >Reply-To: "Luis Torres" > >Priority: Normal > >X-Mailer: PMMail 1.95a For OS/2 > >Subject: Re: PSN and RESINE > > > >Hi Larry, > > > >Thank you for e-mail. Do you confirm that you will not be around on the 27th > >November?. Your suggestion of Dave Nelson is problematic because of the > >time lag (we have UTC, and the time lag is even greater than yours!), To > >contact at 16h here, that would mean your 8h local time. Maybe Edward > >Cranswick could help us. Could you please 'introduce' me, to him? > > > >Will it be possible to exchange some e-mail with you early next week?. We > >could prepare an HTML page about RESINE and send it to you to be > >included on your server. Some pointers for our page (hopefully in English > >early next week), could also be included on your page. > > > >Regards, > > > >Luis -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Walt Williams" Subject: Gobble Gobble and a Cool Seismic Website Date: Tue, 24 Nov 1998 03:25:23 +0000 Hello All, For newbies to the science of seismology (like me) check out this cool site: http://www.mines.edu/fs_home/tboyd/GP311/MODULES/SEIS/main.html Under SECTIONS: walk the 'Notes' tree --it is truly an education. Best Wishes, (and holidays), Walt Williams, 98.11.24, PSN Station #62 p.s. Dave Nelson, Thank you. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Re: Gobble Gobble and a Cool Seismic Website Date: Tue, 24 Nov 1998 09:01:03 -0700 (MST) Tom Boyd's site is among those listed in the "The Virtual Geosciences Professor's GeoScience Site of the Fortnight," which is a good source of useful and educational web sites. http://www.uh.edu/~jbutler/anon/site/archive.html JCLahr > From: "Walt Williams" > To: PSN-L > Date: Tue, 24 Nov 1998 03:25:23 +0000 > this cool site: > > http://www.mines.edu/fs_home/tboyd/GP311/MODULES/SEIS/main.html > > Under SECTIONS: walk the 'Notes' tree --it is truly an education. > Best Wishes, (and holidays), > > Walt Williams, 98.11.24, _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Rex Klopfenstein, Jr." Subject: PSN - VBB Flexures Date: Tue, 24 Nov 1998 12:31:24 -0500 Sean I have been looking at the photographs of your VBB; in particular, the boom hinge. Is it my eyes or are the flexures angled? If these flextures are angled, what is the relationship to the boom; ie, looking from the rear does the vertical flextures slope toward or away from boom (how much?). Also do the horizontal flexure elements slope in relation to the boom (looking down from top)? I have just sorted through my junk to find parts for the Bridge Amplifier. After Thanksgiving I plan to assembly and test. As soon as I have finished I will post a circuit. By the way, I am using two OP97 op amps for the bridge amplifier circuit. Also I am going to use so 'not so expensive' 100 ohms pots in bridge for testing. I am currently looking for some surplus high performance pots. -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: PSN and RESINE Date: Tue, 24 Nov 1998 13:29:07 -0700 Luis- John Lahr just pointed out to me that the Resine national meeting is this Friday, 27 November (I do not know why I thought it was December). I will be able to assist you then. Assuming that the meeting is at 16:00 GMT and will last for about an hour, John Lahr and I plan to sit together then in either his office or my office to respond to the questions. You should send the messages to all the PSN, i.e., PSN-L, and John and I can at least provide one answer to each question. I anticpate that my main difficulty is that I am digitally impaired; I type with only one finger, and so I will not be able to respond very rapidly -- but John can type fast. In principle, I could be in the office at my computer earlier than 16:00 GMT 27 Nov. Please let us know the precise time and schedule. Looking forward to a new kind of PSN/Internet interaction. -Edward Edward Cranswick wrote: > Luis- > I think your plan to have a live presentation as an introduction of the PSN > is excellent. I would very much like to help you host this program by answering > questions, however, I plan to be in Hawaii at that time. I talked about your plan > with John Lahr, and he suggested that having several PSN people participating and > answering questions would be a good alternative to just one designated person. I > looked at the Resine website , and I am impressed > by the records of earthquakes that you have already compiled. I am interested to > see how your plan advances, and I hope that I can assist you. > -Edward > > Larry Cochrane wrote: > > > Edward, > > > > Can you help out Luis Torres in Portugal with this? I won't be around on > > the 27th and he would like someone from the PSN to email (or IRC) questions > > too during his talk. Luis is in the process of setting up several station > > using SDR. Below are his emails too me about this. > > > > Luis; If Edward can't do it, I would send an email out to the PSN-L list > > explaining your request. I'm sure someone on the list can help. > > > > Thanks, > > > > -Larry > > > > >From Luis on 10/20/98: > > > > >Now within Resine I plan to have a first national meeting in Lisbon on 27th > > >November, and would like to count on your cooperation. I want the students > > with > > >the help of teachers to have their HTML pages with a description of their > > stations > > >readily available. Than at say 8h your time each of the 5 schools would > > email you > > >their page and one question about PSN. This would be projected in a big > > >screen. Maybe IRC would be better... > > > > >Then you would integrate Resine (6 stations in mainland Portugal) in PSN. We > > >have our pages in http://geomist.igm.pt/resine (not yet in English and under > > >major reorganization, but would be ready early next month). this would be > > >important because the students would feel proud about their installations > > and > > >would be an incentive to keep them going. A number of discussions on > > >seismology , civil protection, emergencies, etc will take place with > > experiments > > >on liquefaction, faulting, building colapse, etc, going on teachers and > > students. I > > >expect about 60 people. Could I count on you on this official launch of > > Resine, as > > >a PSN affiliate?. > > > > >From: torres@...... > > >To: "Larry Cochrane" > > >Date: Fri, 20 Nov 98 19:43:48 > > >Reply-To: "Luis Torres" > > >Priority: Normal > > >X-Mailer: PMMail 1.95a For OS/2 > > >Subject: Re: PSN and RESINE > > > > > >Hi Larry, > > > > > >Thank you for e-mail. Do you confirm that you will not be around on the 27th > > >November?. Your suggestion of Dave Nelson is problematic because of the > > >time lag (we have UTC, and the time lag is even greater than yours!), To > > >contact at 16h here, that would mean your 8h local time. Maybe Edward > > >Cranswick could help us. Could you please 'introduce' me, to him? > > > > > >Will it be possible to exchange some e-mail with you early next week?. We > > >could prepare an HTML page about RESINE and send it to you to be > > >included on your server. Some pointers for our page (hopefully in English > > >early next week), could also be included on your page. > > > > > >Regards, > > > > > >Luis > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: torres@...... Subject: Re: PSN and RESINE Date: Tue, 24 Nov 98 21:53:28 Dear fellows, Some of you may already know that we proposed to install Lehman seismographs, based on Larry's boards and SDR in five secondary schools in mainland Portugal and it was approved, was financed and we are having our first meeting on the 27th. The network is called RESINE (which stands for Rede Sismologica Inter-Escolar, something like school seismic network). This is intended to be part of PSN. Our aim is to instill in K-10 to K-12 interest for science subjects, envolve science and humanities teachers in the process and by properly calibrating and installing the seismographs actually complementing the official network and to get the local community envolved in understanding how the earth works and cooperate in preparedness actions. So I ask for volunteers on the 27th. Please bear in mind taht our local time is GMT. The program is as follows: 9h-13h: Team meeting (teachers and students from the 5 schools share their knowledege about the seimsographs: technical problems; timing; local installation; picking events; magnitudes; etc). I hope to have some 25-30 people. Some experiments based on "Seismic Sleuths" from the American Geophysical Union (an excelent publication) are mounted and experimented with. (some lessons were translated and adapted. In the afternoon with meet in an auditorium: more schools and people will come 14:30 - 15:00 Talk on seismicity (Seismologist from local University- Paula Costa) 15:00 - 15:30 Talk on buildings that resist earthquakes (Eng from another local University - Luis Guerreiro) 15:30-16:30 Resine and PSN - how to explore the records and also some live exchange of ideas with PSN members. (more about this bellow) 16:30-17:00 Talk by Emergency Protection Agency representative 17:00-17:30 Visit to the experiments by the audience. We have a web page: http://geomist.igm.pt/resine. Unfortunately it is still only in portuguese (there will be an English version tomorrow). We expect the movement to grow and envolve more schools. Now, what I expect from the community. To help me during the 15:30-16:30 period to have a live chat with the audience (mostly students and teachers). I have an internet connection in the auditorium and will project the computer screen for the people to see. I want people in the audience to ask questions addressed to the community and someone online to answer. I think the students will feel more motivated to run their own seismographs and learn about the subject, as part of global community. Now some technalities. How to do it?. I have no experience on that. IRC?, My son uses it and might help me. Would normal posting to list be OK. Maybe some questions are prepared in the morning and typed (the auditorium is not of native english speakers) beforehand, than the e-mails (questions) will be cut&paste. Some subjects fascinated me like getting the e-mail in PSN about event before it actually arrived at the site!. Topics from local meetings are also interesting. Please post suggestions and volunteer. I am counting on you... Thanks Luis Torres Instituto Geologico e Mineiro Lisboa Portugal phone:351-1-4718922 fax:351-1-4719018 email: torres@...... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: RADIOTEL@....... Subject: Y SHAPED UPPER WIRE FOR LEHMAN Date: Tue, 24 Nov 1998 20:01:59 EST Steve Hammond, et al. In a previous post, you suggested using a Y shaped upper wire for constructing a lehman seismograph. Looking at the photograph on your web site I could not determined whether there is some special, or preferred way to tie the wire at the point where the three intersect. Would appreciate knowing how you or anyone else that have used this method have done it. BTW, how much impact does this "rotating about the boom" situation have on the Lehman. I have noted several Lehman's that use a point source as a pivot (or ball bearing) that only use one wire such as the one by Frank Cooper in Texas. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: Re: Y SHAPED UPPER WIRE FOR LEHMAN Date: Tue, 24 Nov 1998 20:23:52 -0600 (CST) Re suspension for long period horizontal boom. It is more of an inverted V than a Y, There is a wire coming from each side of the mass going up toward the upper suspension point. This wire loops through a broad saddle in a triangular block. The upper point of this triangle has a very short wire connecting it to the upper point of the suspension mast via an adjustment screw; this short wire is in fact the upper pivot, and should be only a few mm long. Take a look at the drawing of the old Sprengnether horizontal that can be found at: http://www.eas.slu.edu/People/STMorrissey/index.html I think it is on the PSN info page. I also recommend the reversed-tension arrangement for the lower pivot rather than any bearing or knife-edge arrangement. It is also shown in the drawing. THis was the seismometer that was deployed in the hundreds of stations of the WWNSS, Worldwide Network of Standard Seismographs, of the USGS (was NOAA then) in the late 50's. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: Re: Y SHAPED UPPER WIRE FOR LEHMAN Date: Tue, 24 Nov 1998 20:23:52 -0600 (CST) Re suspension for long period horizontal boom. It is more of an inverted V than a Y, There is a wire coming from each side of the mass going up toward the upper suspension point. This wire loops through a broad saddle in a triangular block. The upper point of this triangle has a very short wire connecting it to the upper point of the suspension mast via an adjustment screw; this short wire is in fact the upper pivot, and should be only a few mm long. Take a look at the drawing of the old Sprengnether horizontal that can be found at: http://www.eas.slu.edu/People/STMorrissey/index.html I think it is on the PSN info page. I also recommend the reversed-tension arrangement for the lower pivot rather than any bearing or knife-edge arrangement. It is also shown in the drawing. THis was the seismometer that was deployed in the hundreds of stations of the WWNSS, Worldwide Network of Standard Seismographs, of the USGS (was NOAA then) in the late 50's. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: VBB flexures Date: Tue, 24 Nov 1998 20:42:17 -0600 (CST) Rex, The flexures only appear to be at an angle. Look at the drawing of the vertical. But in reality the angle of the metal strip is not at all critical, since the flexing or bending axis will always be exactly parallel with the corners of the two mounting angle brackets, and at right angles to the boom. With this arrangement, they have no choice but to all bend in alignment, since it is the only degree of freedom. This is why the hinge strips can be epoxied to the brackets and "eyeballed" for positon. The detail that cannot be seen is that the sharp corner of each mounting bracket is filed to 45 degrees under all the hinge strips. This prevents any contact between the hinge halves, so that the axis of the bending is in open space between the bracket corners. Care must be taken that no epoxy gets into this clearance area. (I should add this detail to the mechanical drawing). Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone suspension Date: Tue, 24 Nov 1998 21:03:12 -0600 (CST) Barry, The moving mass (or the coil in geophone) is centered by the balance between its weight and the upward force of the suspension springs. When the suspension springs are properly cut (often etched for exactness) and bent by the mfgr, a point of minimal change of restoring force exists over a small distance near the center of the movement, and a relatively long period is realized. Usually any bending or manipulation of these leaf springs destroys this effect, and the seis becomes unstable or a "big sitter" with the mass on the bottom stop. I have spent many hours trying to get an L4-C back to a 1 second period. The springs do sag with time, and after many years the best solution to a lowered mass (and shorter period) (nothing personal) is to tilt the seis about 10 degrees, which decreases the gravity vector, and centers the mass. No one using 1-second data can tell that the seis is 10 degrees off of vertical. On the other hand, tilt is used in setting up a VBB vertical to make sure the movement is along the "maximum gravity" vector. So regarding the question of friction in a suspension: there never is any. All the movement is accomplished and controlled by the bending of flexures and/or leaf or diaphram type springs. THis is why dynamic damping is needed, since without friction, the mass will oscillate, only dying out as air-viscosity damping absorbs the energy. regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: RADIOTEL@....... Subject: Re: Y SHAPED UPPER WIRE FOR LEHMAN Date: Tue, 24 Nov 1998 23:16:48 EST Sean-Thomas Now I see the short wire. I had looked at the drawing on your web page before but somehow had totally overlooked it. Of course without this wire the instrument could not function. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Steve Hammond Subject: Re: Northern California PSN meeting in December Date: Tue, 24 Nov 1998 20:56:59 -0800 Sorry for the delay in responding... YES! I'ed like to attend. Larry, please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and earthquakes. Regards, Steve Hammond PSN San Jose Ken Navarre wrote: > > On Tue, 17 Nov 1998, Larry Cochrane wrote: > > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > what we can do is have a more informal diner get together at a restaurant > > around here. We could do this sometime during the week when you, S-T > > Morrissey, Edward, and anyone else who would like too attend, will be here. > > > > -Larry > > Let me know when & where and I'll try to be there. > Ken > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: My last thread until my first event Date: Tue, 24 Nov 1998 22:18:09 -0700 I'm about to bury my geophone. It will be inside a PVC pipe case about 3 feet down. Maybe more. I dunno. I stopped at about 3 feet today. Up until now I've had my geophone sitting in my rack cabinent. Every time I walked in you'd see the noise from me walking down the hall and then a longer period wave as the floor bent (I assume). I've seen a couple of different types of installations in pictures mostly. I was wondering about the advantages. Some are obvious. Connected to a post buried in the ground. Kinda like a flag pole with the pole mostly in the ground. Wouldn't the surface noise travel up the pole? Down a borehole. Wouldn't the suface noise travel down the liner? We did the peir versus buried one already. Thanks for any comments, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: installation noise Date: Tue, 24 Nov 1998 23:58:47 -0600 (CST) Greg, A note on the character of surface noise. The wavelength depends on the wave velocity and the frequency, like v=f*l, or l = v/f. So a handy surface velocity for seismic surface waves is 3 km/sec, so the wavelength is 3 km at 1 hz, or 300 meters at 10 hz, 30 m at 100 hz. So the seismic wave is generally larger than the dimensions of the local installation. The main reason we use shallow borehole installations is to reach the relatively stable thermal regiem 1 to 3 meters down, where there is also a measure of security and physical stability compared to the surface. For all the stations I installed, we used 1 meter ABS pipes 3" in diameter, with an electrical feedthru in the cap, and taped shut (after meticulous cleaning) with good vinyl electrical tape (3m's 88 type). Using 5 - 10 units of desiccant will keep it dry for a year or two if the seals are good. The top of the pipe is about 1 foot down, and protected (for later digging up) with a round lawn irrigation valve cover or a cut-off 2liter plastic soda jug. We have had stations burned out (when the wheat straw was torched), but with all the telemetry electronics in the buried pipe, our loss was limited to the radio transmitter and battery pack. A last note: you mention a longer period noise after your walking across the room. This sounds like the amplifier is clipping from the high signal level, and this is the recovery transient. A geophone would not be very sensitive to floor tilt. Regards, Sean_Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: installation noise Date: Tue, 24 Nov 1998 23:33:17 -0700 S-T Morrissey wrote: > A last note: you mention a longer period noise after your walking across > the room. This sounds like the amplifier is clipping from the high signal > level, and this is the recovery transient. A geophone would not be very > sensitive to floor tilt. I think it is floor tilt. I have Larry's amp and a GS-11D 4.5 Hz. I can watch the trace rise and fall as I shift my weight from one foot to the other. The concrete is pretty thin here because frost only happens a few times a year and snow is even more rare. The signal is very low amplitude. It's usually less than +-500. If I sit really quietly at night it goes down to less than +-100. If I tap the cabinent with one finger it will go off the screen. Still not out of range though. I thought for sure the reason they bury instruments was to reduce the high frequency noise. Isn't the Earth a low pass filter? More Earth == less surface noise? If so I'd love to call a well drill rig out and say 'go for it!' ;) $$$$$! I was just working on the signal cables. I got some shielded audio cable from Radio Shack. The kind that goes from RCA to RCA connector. I might look for one of those sprinkler valve box covers. I doubt I'll be anxious to dig it up the next time I have to move. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: New Public Seismic Network Date: Tue, 24 Nov 1998 23:33:15 -0700 > Wayne Abraham wrote: > > > Hello, > > > > My name is Wayne Abraham on the Caribbean island of Dominica. We are > > located midway down the island chain, about 500 miles south-east of > > Puerto Rico. Dominica (not the Dominican Republic) is an independent > > island nation which attained its independence from Great Britain in > > November 1978. > > > > I am not a geologist, seismologist, volcanologist or anything near that. > > I am an electrician who got interested in the field because of certain > > circumstances. Our island is the most rugged of all the caribbean > > islands and we have 10 volcanoes on 289 square miles. We sit on the > > Atlantic/Caribbean plate boundry, have the most volcanoes per square > > mile and the world's largest boiling lake. Recently there has been an > > upsurge of activity in the vicinity of a cluster of volcanoes in the > > south of the island. Numerous tremours have been felt by locals and > > there has been rockfalls and cracking of concrete structures. The > > island's seismic activity is being monitored by the Seismic Research > > Unit of the University of the West Indies in Trinidad. I can give more > > geologic background information on the island if anyone is interested. > > > > I was able to get our local amateur radio club, of which I am a member, > > interested in setting up a public seismic network where we could share > > data from both local and regional events. There is no public seismic > > network on any of the islands and most people seem to think that only > > professionals can monitor seismic activity. This way of thinking I wish > > to change and I have already found 5 members of our club who are willing > > to get into actively monitoring seismic events. > > > > Our problem though is funds. Our club operates on a shoe string budget > > and most of the repeater equipment we have on our mountains are donated. > > I am looking for anyone who may be able to assist us in getting donated > > equipment etc. for our project. > > > > Your assistance will be greatly appreciated. > > > > Wayne > > > Wayne, >From the web tourist sites, I saw on the Commonwealth of Dominica; the heavy rain fall would be a real problem especially with conventional (long period seismometers), which are real prone to water/tilt effects. Perhaps the only real alternative would be using geophones; which would probably work well for the size of the island and local monitoring. Cost wise, alot of these can be alot cheaper than even conventional home brew seismometers. Do you have a general plan for what you are comtemplating? If the long range goal is computer recording, it may do well to locally check into possible sources, like individuals with older equipment, who may be inticed into donating such, when they upgrade, or possibly for a small cost.....or even the possiblity of a trade off of your skills or those of some of the other amateur radio group? I got my computer for a trade off, due to a computer program problem which I resolved over a weeks spare time via a friend who later regraded to a new system. Regardless, I do wish you success in your groups goals. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: installation noise Date: Tue, 24 Nov 1998 23:47:40 -0700 Greg wrote: > S-T Morrissey wrote: > > > A last note: you mention a longer period noise after your walking across > > the room. This sounds like the amplifier is clipping from the high signal > > level, and this is the recovery transient. A geophone would not be very > > sensitive to floor tilt. > > I think it is floor tilt. I have Larry's amp and a GS-11D 4.5 Hz. I can > watch the trace rise and fall as I shift my weight from one foot to the > other. The concrete is pretty thin here because frost only happens a few > times a year and snow is even more rare. The signal is very low > amplitude. It's usually less than +-500. If I sit really quietly at > night it goes down to less than +-100. If I tap the cabinent with one > finger it will go off the screen. Still not out of range though. > > I thought for sure the reason they bury instruments was to reduce the > high frequency noise. Isn't the Earth a low pass filter? More Earth == > less surface noise? If so I'd love to call a well drill rig out and say > 'go for it!' ;) $$$$$! > > I was just working on the signal cables. I got some shielded audio cable > from Radio Shack. The kind that goes from RCA to RCA connector. > > I might look for one of those sprinkler valve box covers. I doubt I'll > be anxious to dig it up the next time I have to move. > > ,Greg > Greg, Suggest trying a resistor between the + input and your preamp, of around 5 to 10K; that should reduce the gain. I had to use a 10K myself, as the gain was way to much, even when reducing the trim pots on Larrys preamp, the gain is some 1600; which I think you are also using. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Re: PSN and RESINE Date: Tue, 24 Nov 1998 23:22:46 -0800 Luis -- I am happy to assist you on the 27th. As it is a holiday from work for me I will be available after about 15:00 GMT. I have some experience with IRC, and I can work with other formats as needed. I am not a professional seismologist, but will answer questions as best I can. When you find out, please let me know any further details about how to connect with your group. Regards, Karl Cunningham La Mesa, Southern California, USA. PSN Station #40 karlc@....... At 09:53 PM 11/24/98, you wrote: >9h-13h: Team meeting (teachers and students from the 5 schools share their >knowledege about the seimsographs: technical problems; timing; local installation; >picking events; magnitudes; etc). I hope to have some 25-30 people. Some >experiments based on "Seismic Sleuths" from the American Geophysical Union (an >excelent publication) are mounted and experimented with. (some lessons were >translated and adapted. > >In the afternoon with meet in an auditorium: more schools and people will come > >14:30 - 15:00 Talk on seismicity (Seismologist from local University- Paula Costa) >15:00 - 15:30 Talk on buildings that resist earthquakes (Eng from another local >University - Luis Guerreiro) >15:30-16:30 Resine and PSN - how to explore the records and also some live >exchange of ideas with PSN members. (more about this bellow) >16:30-17:00 Talk by Emergency Protection Agency representative >17:00-17:30 Visit to the experiments by the audience. > >We have a web page: http://geomist.igm.pt/resine. Unfortunately it is still only in >portuguese (there will be an English version tomorrow). We expect the movement >to grow and envolve more schools. > >Now, what I expect from the community. To help me during the 15:30-16:30 period >to have a live chat with the audience (mostly students and teachers). I have an >internet connection in the auditorium and will project the computer screen for the >people to see. I want people in the audience to ask questions addressed to the >community and someone online to answer. I think the students will feel more >motivated to run their own seismographs and learn about the subject, as part of >global community. > >Now some technalities. How to do it?. I have no experience on that. IRC?, My son >uses it and might help me. Would normal posting to list be OK. Maybe some >questions are prepared in the morning and typed (the auditorium is not of native >english speakers) beforehand, than the e-mails (questions) will be cut&paste. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ian & Liz Subject: Re: dt2801 support/info Date: Tue, 24 Nov 1998 22:11:25 -1000 Hi, I've managed to get some info on this board, thanks to others, and no thanks to DT. Rather than bombard your inbox with loads of stuff, take a look at http://www.flex.com/~macsmith/dt2801.htm cheers Ian smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Francesco" Subject: AMPLITUDE SIGNAL PROBLEM Date: Wed, 25 Nov 1998 09:15:26 +0100 Hi all. This is my problem: I use a vertical sensor, with a boom of ~ 5 kg, a coil of ~9000 ohms = (extract from a DC relay) a magnet and Larry's ampli. I'm living in a small city, but the natural noise is rather high, in = particular during the day. But the most rilevant problem is that the = amplitude of the signal when occour an event is very low. Yesterday is = occourred a 3.5 Ml 48 km from my station and the pick of signal was 400 = data count. Too low !!!! If I add the gain it will increase the noise. If I reduce it, the = signal, obviusly, is too low. Other: the maxium amplitude signal it was (always) 2000 counts [5.9 Mb = at 50km from me; 5.6 Ml at 581 km ecc.), with saturation. !!!!!! All = that, with the others sensor too. (horizontal long period, horiz. short = p.) I have located the sensors in my garage, external from housein a quietly = zone, with a radio cable of ~100 ft. What I must do, to resolving these problems? Is there a system to watch or calculate the effective gain of ampli and = to add data counts? Thank to all for the help Francesco Nucera - Osimo, Italy

Hi all.
This is my problem:
I use a vertical sensor, with a boom = of ~ 5 kg,=20 a coil of ~9000 ohms (extract from a DC relay) a magnet and Larry's=20 ampli.
 
I'm living in a small city, but the = natural=20 noise is rather high, in particular during the day. But the most = rilevant=20 problem is that the amplitude of the signal when occour an event is very = low.=20 Yesterday is occourred a 3.5 Ml 48 km from my station and the pick of = signal was=20 400 data count. Too low !!!!
If I add the gain it will increase = the noise. If=20 I reduce it, the signal, obviusly, is too low.
Other: the maxium amplitude signal it was (always) = 2000 counts=20 [5.9 Mb at 50km from me; 5.6 Ml at 581 km ecc.), with saturation.=20 !!!!!!     All that,  with the others sensor = too.=20 (horizontal long period, horiz. short p.)
I have located the sensors in my garage, external = from housein=20 a quietly zone, with a radio cable of ~100 ft.
 
What I must do, to resolving these = problems?
 
Is there a system to watch or = calculate the=20 effective gain of ampli and to add data counts?
 
Thank to all for the help
 
Francesco Nucera    -  Osimo,=20 Italy
From: Ian & Liz Subject: Re: dt2801 support/info Date: Tue, 24 Nov 1998 22:23:58 -1000 Sorry, I didn't mean to send this to the list... Just as well it was only a web link! Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: torres@...... Subject: Re: PSN and RESINE Date: Wed, 25 Nov 98 10:36:59 Karl, Thank you. I think we have a problem here with IRC because of the firewall. Easiest way is to subscribe to PSN-L under RESINE and allow the people here to use this account. A number of signatures will be created for the different people, during the morning, to give a more personal touch. Luis On Tue, 24 Nov 1998 23:22:46 -0800, Karl Cunningham wrote: >Luis -- > >I am happy to assist you on the 27th. As it is a holiday from work for me >I will be available after about 15:00 GMT. I have some experience with >IRC, and I can work with other formats as needed. I am not a professional >seismologist, but will answer questions as best I can. > >When you find out, please let me know any further details about how to >connect with your group. > >Regards, > >Karl Cunningham >La Mesa, Southern California, USA. >PSN Station #40 >karlc@....... > > >At 09:53 PM 11/24/98, you wrote: >>9h-13h: Team meeting (teachers and students from the 5 schools share their >>knowledege about the seimsographs: technical problems; timing; local >installation; >>picking events; magnitudes; etc). I hope to have some 25-30 people. Some >>experiments based on "Seismic Sleuths" from the American Geophysical Union >(an >>excelent publication) are mounted and experimented with. (some lessons were >>translated and adapted. >> >>In the afternoon with meet in an auditorium: more schools and people will >come >> >>14:30 - 15:00 Talk on seismicity (Seismologist from local University- >Paula Costa) >>15:00 - 15:30 Talk on buildings that resist earthquakes (Eng from another >local >>University - Luis Guerreiro) >>15:30-16:30 Resine and PSN - how to explore the records and also some live >>exchange of ideas with PSN members. (more about this bellow) >>16:30-17:00 Talk by Emergency Protection Agency representative >>17:00-17:30 Visit to the experiments by the audience. >> >>We have a web page: http://geomist.igm.pt/resine. Unfortunately it is >still only in >>portuguese (there will be an English version tomorrow). We expect the >movement >>to grow and envolve more schools. >> >>Now, what I expect from the community. To help me during the 15:30-16:30 >period >>to have a live chat with the audience (mostly students and teachers). I >have an >>internet connection in the auditorium and will project the computer screen >for the >>people to see. I want people in the audience to ask questions addressed to >the >>community and someone online to answer. I think the students will feel more >>motivated to run their own seismographs and learn about the subject, as >part of >>global community. >> >>Now some technalities. How to do it?. I have no experience on that. IRC?, >My son >>uses it and might help me. Would normal posting to list be OK. Maybe some >>questions are prepared in the morning and typed (the auditorium is not of >native >>english speakers) beforehand, than the e-mails (questions) will be >cut&paste. > > >__________________________________________________________________ ___ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: installation noise Date: Wed, 25 Nov 1998 09:29:19 -0700 meredith lamb wrote: > Suggest trying a resistor between the + input and your preamp, > of around 5 to 10K; that should reduce the gain. I had to I think the gain is fine now. I did mess with it at first though. The signal shows well above the noise. It just depends on what you consider signal. :) I have seen a train passing and of course the garbage truck. I did get the 16 bit board so there is still about +-29500 of room above noise. Until 20+ bits becomes really cheap or I win the Lottery that's enough. Everyone have a happy T-day! ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Re: dt2801 support/info Date: Wed, 25 Nov 1998 10:25:06 -0700 (MST) > From psn-l-return@.............. Wed Nov 25 01:30 MST 1998 > Date: Tue, 24 Nov 1998 22:23:58 -1000 > From: Ian & Liz > MIME-Version: 1.0 > To: PSN-L Mailing List Ian, I'm glad you did! I love the way individuals can provide better information than the companies can themselves. DT is a bear to deal with. JCLahr > > Sorry, > > I didn't mean to send this to the list... Just as well it was only a web link! > > Ian Smith > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: PSN and RESINE Date: Wed, 25 Nov 1998 10:35:55 -0700 torres@...... wrote: > Karl, > > Thank you. I think we have a problem here with IRC because of the firewall. > Easiest way is to subscribe to PSN-L under RESINE and allow the people here to > use this account. A number of signatures will be created for the different people, > during the morning, to give a more personal touch. > > Luis > Luis, With your decision to use the PSN-L mailing list communication approach, I would imagine that you will find a much broader audience of interested people to your 15:30 to 16:30 Resine and PSN exchange of ideas session on November 27th, than be possible via other communication routes. Would suggest that you and others involved, take it for granted that their could be a wide variety of responses from all manner of people already on the list, regardless of their offical declaration of volunteering. I would also like to participate as a volunteer, but with the logic that perhaps alot of subjects, will be considered to be of only a amateurs opinion or suggestion, rather than anywhere near being an expert. Seismology and seismographs cover too many involved fields of associated sciences to where any one person would normally be able to totally know or submit an exact path of guidance. With the suggestion of an open formum, I hope you will consider it as a potential enhancement? Have to also say that you have taken on an enormious task with this wide national spaced educational goal, and that it may involve a great deal of time and expense to accomplish over a period of years. Also, that this presentation could have a global example for other countries to follow...obviously. I would suggest that although the "Lehman" original design is of the primary beginning plans, there should be strong consideration of upgrading it in certain aspects eventually. Personally even after this event, I hope their will be more communication of progress and even of the obstacles in the future. I would agree that it would likely be more advantagious to submit a list of anticipated questions prior to this hour and a half, to best take advantage of the preparation and short reply time. Perhaps with such done, we could even email a direct reply to you before the allotted time, to have an immediate presentation without any lost time. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham Subject: Re: New Public Seismic Network Date: Wed, 25 Nov 1998 14:09:52 -0400 meredith lamb wrote: > Wayne, > > >From the web tourist sites, I saw on the Commonwealth of > Dominica; the heavy rain fall would be a real problem especially > with conventional (long period seismometers), which are real > prone to water/tilt effects. Perhaps the only real alternative would > be using geophones; which would probably work well for the size > of the island and local monitoring. Cost wise, alot of these can be > alot cheaper than even conventional home brew seismometers. > > Do you have a general plan for what you are comtemplating? > If the long range goal is computer recording, it may do well to > locally check into possible sources, like individuals with older > equipment, who may be inticed into donating such, when they > upgrade, or possibly for a small cost.....or even the possiblity of > a trade off of your skills or those of some of the other amateur > radio group? I got my computer for a trade off, due to a computer > program problem which I resolved over a weeks spare time via > a friend who later regraded to a new system. > > Regardless, I do wish you success in your groups goals. > > Meredith Lamb Meredith Dominica does have alot of rain - in excess of 300 inches per anum. I really do not know how I am going to get this project done. I am depending on information I get on this list and other sites on the internet to give me some guidelines on what course I should chart. While our amateur club is willing to participate, they are all depending on me to get something started. I am more or less leaning towards setting up a seismometer here at home, get used to its operation and then pass the knowledge to others who are interested. Another possibility is to install 3 remote sensors at our repeater sites and have a 486 computer here to decode the telemetry. Of course, I have absolutely no equipment at the moment so I am more or less sitting back and reading the mail as it goes by. Getting seismic equipment here is impossible. The most I can may be able to salvage is a computer. Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: PSN and RESINE] Date: Wed, 25 Nov 1998 11:52:58 -0700 Luis- We have been having problems with our USGS server, and apparently this email (below) I sent to you yesterday was never actually transmitted. John Lahr & I plan to be to be at our computer at the office on Friday, 27 Nov to assist you: 15:30-16:30 Resine and PSN - how to explore the records and also some live exchange of ideas with PSN members. What is the IRC problem? -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Luis- John Lahr just pointed out to me that the Resine national meeting is this Friday, 27 November (I do not know why I thought it was December). I will be able to assist you then. Assuming that the meeting is at 16:00 GMT and will last for about an hour, John Lahr and I plan to sit together then in either his office or my office to respond to the questions. You should send the messages to all the PSN, i.e., PSN-L, and John and I can at least provide one answer to each question. I anticpate that my main difficulty is that I am digitally impaired; I type with only one finger, and so I will not be able to respond very rapidly -- but John can type fast. In principle, I could be in the office at my computer earlier than 16:00 GMT 27 Nov. Please let us know the precise time and schedule. Looking forward to a new kind of PSN/Internet interaction. -Edward Edward Cranswick wrote: > Luis- > I think your plan to have a live presentation as an introduction of the PSN > is excellent. I would very much like to help you host this program by answering > questions, however, I plan to be in Hawaii at that time. I talked about your plan > with John Lahr, and he suggested that having several PSN people participating and > answering questions would be a good alternative to just one designated person. I > looked at the Resine website , and I am impressed > by the records of earthquakes that you have already compiled. I am interested to > see how your plan advances, and I hope that I can assist you. > -Edward > > Larry Cochrane wrote: > > > Edward, > > > > Can you help out Luis Torres in Portugal with this? I won't be around on > > the 27th and he would like someone from the PSN to email (or IRC) questions > > too during his talk. Luis is in the process of setting up several station > > using SDR. Below are his emails too me about this. > > > > Luis; If Edward can't do it, I would send an email out to the PSN-L list > > explaining your request. I'm sure someone on the list can help. > > > > Thanks, > > > > -Larry > > > > >From Luis on 10/20/98: > > > > >Now within Resine I plan to have a first national meeting in Lisbon on 27th > > >November, and would like to count on your cooperation. I want the students > > with > > >the help of teachers to have their HTML pages with a description of their > > stations > > >readily available. Than at say 8h your time each of the 5 schools would > > email you > > >their page and one question about PSN. This would be projected in a big > > >screen. Maybe IRC would be better... > > > > >Then you would integrate Resine (6 stations in mainland Portugal) in PSN. We > > >have our pages in http://geomist.igm.pt/resine (not yet in English and under > > >major reorganization, but would be ready early next month). this would be > > >important because the students would feel proud about their installations > > and > > >would be an incentive to keep them going. A number of discussions on > > >seismology , civil protection, emergencies, etc will take place with > > experiments > > >on liquefaction, faulting, building colapse, etc, going on teachers and > > students. I > > >expect about 60 people. Could I count on you on this official launch of > > Resine, as > > >a PSN affiliate?. > > > > >From: torres@...... > > >To: "Larry Cochrane" > > >Date: Fri, 20 Nov 98 19:43:48 > > >Reply-To: "Luis Torres" > > >Priority: Normal > > >X-Mailer: PMMail 1.95a For OS/2 > > >Subject: Re: PSN and RESINE > > > > > >Hi Larry, > > > > > >Thank you for e-mail. Do you confirm that you will not be around on the 27th > > >November?. Your suggestion of Dave Nelson is problematic because of the > > >time lag (we have UTC, and the time lag is even greater than yours!), To > > >contact at 16h here, that would mean your 8h local time. Maybe Edward > > >Cranswick could help us. Could you please 'introduce' me, to him? > > > > > >Will it be possible to exchange some e-mail with you early next week?. We > > >could prepare an HTML page about RESINE and send it to you to be > > >included on your server. Some pointers for our page (hopefully in English > > >early next week), could also be included on your page. > > > > > >Regards, > > > > > >Luis > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Edward Cranswick Subject: [Fwd: [Fwd: PSN and RESINE]] Date: Wed, 25 Nov 1998 11:56:23 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Luis- We have been having problems with our USGS server, and apparently this email (below) I sent to you yesterday was never actually transmitted. John Lahr & I plan to be to be at our computer at the office on Friday, 27 Nov to assist you: 15:30-16:30 Resine and PSN - how to explore the records and also some live exchange of ideas with PSN members. What is the IRC problem? -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Luis- John Lahr just pointed out to me that the Resine national meeting is this Friday, 27 November (I do not know why I thought it was December). I will be able to assist you then. Assuming that the meeting is at 16:00 GMT and will last for about an hour, John Lahr and I plan to sit together then in either his office or my office to respond to the questions. You should send the messages to all the PSN, i.e., PSN-L, and John and I can at least provide one answer to each question. I anticpate that my main difficulty is that I am digitally impaired; I type with only one finger, and so I will not be able to respond very rapidly -- but John can type fast. In principle, I could be in the office at my computer earlier than 16:00 GMT 27 Nov. Please let us know the precise time and schedule. Looking forward to a new kind of PSN/Internet interaction. -Edward Edward Cranswick wrote: > Luis- > I think your plan to have a live presentation as an introduction of the PSN > is excellent. I would very much like to help you host this program by answering > questions, however, I plan to be in Hawaii at that time. I talked about your plan > with John Lahr, and he suggested that having several PSN people participating and > answering questions would be a good alternative to just one designated person. I > looked at the Resine website , and I am impressed > by the records of earthquakes that you have already compiled. I am interested to > see how your plan advances, and I hope that I can assist you. > -Edward > > Larry Cochrane wrote: > > > Edward, > > > > Can you help out Luis Torres in Portugal with this? I won't be around on > > the 27th and he would like someone from the PSN to email (or IRC) questions > > too during his talk. Luis is in the process of setting up several station > > using SDR. Below are his emails too me about this. > > > > Luis; If Edward can't do it, I would send an email out to the PSN-L list > > explaining your request. I'm sure someone on the list can help. > > > > Thanks, > > > > -Larry > > > > >From Luis on 10/20/98: > > > > >Now within Resine I plan to have a first national meeting in Lisbon on 27th > > >November, and would like to count on your cooperation. I want the students > > with > > >the help of teachers to have their HTML pages with a description of their > > stations > > >readily available. Than at say 8h your time each of the 5 schools would > > email you > > >their page and one question about PSN. This would be projected in a big > > >screen. Maybe IRC would be better... > > > > >Then you would integrate Resine (6 stations in mainland Portugal) in PSN. We > > >have our pages in http://geomist.igm.pt/resine (not yet in English and under > > >major reorganization, but would be ready early next month). this would be > > >important because the students would feel proud about their installations > > and > > >would be an incentive to keep them going. A number of discussions on > > >seismology , civil protection, emergencies, etc will take place with > > experiments > > >on liquefaction, faulting, building colapse, etc, going on teachers and > > students. I > > >expect about 60 people. Could I count on you on this official launch of > > Resine, as > > >a PSN affiliate?. > > > > >From: torres@...... > > >To: "Larry Cochrane" > > >Date: Fri, 20 Nov 98 19:43:48 > > >Reply-To: "Luis Torres" > > >Priority: Normal > > >X-Mailer: PMMail 1.95a For OS/2 > > >Subject: Re: PSN and RESINE > > > > > >Hi Larry, > > > > > >Thank you for e-mail. Do you confirm that you will not be around on the 27th > > >November?. Your suggestion of Dave Nelson is problematic because of the > > >time lag (we have UTC, and the time lag is even greater than yours!), To > > >contact at 16h here, that would mean your 8h local time. Maybe Edward > > >Cranswick could help us. Could you please 'introduce' me, to him? > > > > > >Will it be possible to exchange some e-mail with you early next week?. We > > >could prepare an HTML page about RESINE and send it to you to be > > >included on your server. Some pointers for our page (hopefully in English > > >early next week), could also be included on your page. > > > > > >Regards, > > > > > >Luis > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: torres@...... Subject: Re: PSN and RESINE Date: Wed, 25 Nov 98 20:21:25 On Wed, 25 Nov 1998 10:35:55 -0700, meredith lamb wrote: >torres@...... wrote: > >> Karl, >> >> Thank you. I think we have a problem here with IRC because of the firewall. >> Easiest way is to subscribe to PSN-L under RESINE and allow the people here to >> use this account. A number of signatures will be created for the different people, >> during the morning, to give a more personal touch. >> >> Luis >> > >Luis, > >With your decision to use the PSN-L mailing list communication >approach, I would imagine that you will find a much broader audience >of interested people to your 15:30 to 16:30 Resine and PSN >exchange of ideas session on November 27th, than be possible >via other communication routes. > >Would suggest that you and others involved, take it for granted >that their could be a wide variety of responses from all manner of >people already on the list, regardless of their offical declaration of >volunteering. Yes. I will ask evryone to keep the word RESINE in the subject, so it will be easier to filter the incoming mail during the session. >I would also like to participate as a volunteer, but with the logic >that perhaps alot of subjects, will be considered to be of >only a amateurs opinion or suggestion, rather than anywhere near >being an expert. Seismology and seismographs cover too many >involved fields of associated sciences to where any one person >would normally be able to totally know or submit an exact path >of guidance. > >With the suggestion of an open formum, I hope you will consider >it as a potential enhancement? > Sure. >Have to also say that you have taken on an enormious task with >this wide national spaced educational goal, and that it may >involve a great deal of time and expense to accomplish over a >period of years. Also, that this presentation could have a global >example for other countries to follow...obviously. > >I would suggest that although the "Lehman" original design is of >the primary beginning plans, there should be strong consideration >of upgrading it in certain aspects eventually. That is in our plans. I have a board for more channels (I plan to add vertical and other horizontal component). But to keep costs down the oher 5 have only one channel. For the moment I am trying to motivate people to keep it running and get a responsible at each site. Because that will envolve costs ... >Personally even after this event, I hope their will be more >communication of progress and even of the obstacles in the future. I surely will. >I would agree that it would likely be more advantagious to >submit a list of anticipated questions prior to this hour and a half, >to best take advantage of the preparation and short reply time. >Perhaps with such done, we could even email a direct reply to >you before the allotted time, to have an immediate presentation >without any lost time. I fully agree. At least some questions will be prepared beforehand. I imagine most will be of a non-technical nature. It will also be necessary to overcome the shyness of people. You know it is different to sit in your terminal and type than getting your message in a big screen in front of the audience. Thanks, Luis Torres >Thanks, Meredith Lamb > > > > > >_________________________________________________________________ ____ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: torres@...... Subject: Re: [Fwd: PSN and RESINE] Date: Wed, 25 Nov 98 20:56:08 Edward, Thanks for your assistance. The message did get through... On Wed, 25 Nov 1998 11:52:58 -0700, Edward Cranswick wrote: >Luis- > We have been having problems with our USGS server, and apparently >this email (below) I sent to you yesterday was never actually >transmitted. John Lahr & I plan to be to be at our computer at the >office on Friday, 27 Nov to assist you: > >15:30-16:30 Resine and PSN - how to explore the records and also some >live exchange of ideas with PSN members. > >What is the IRC problem? To be honest I don't know. I was told I will have problems using IRC behind a firewall. To be on the safe side and because of some advantages I dropped that choice in favour of PSN-L. The problem is that it will be slower... >-Edward > >-- >Edward Cranswick Tel: 303-273-8609 >US Geological Survey, MS 966 Fax: 303-273-8600 >PO Box 25046, Federal Center cranswick@........ >Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: PSN and RESINE - Using the PSN-L list Date: Wed, 25 Nov 1998 14:40:21 -0800 Luis, Edward, John and Others, I would not use the list for the main way of communicating. I would use private email address and CC the list. I did some timing test the other night and it takes about 3 minutes to send a small message out to most of the 270 members. If too many people respond to a question my system could get backup very easily. Just a suggestion.... -Larry Cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ian Smith Subject: new 22 bit USB A/D Date: Wed, 25 Nov 1998 13:26:56 -1000 Hi, IOtech have just brought out a 22 bit USB A/D, starting at $700. http://www.iotech.com/prusb.html One can dream... cheers _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: Northern California PSN meeting in December Date: Wed, 25 Nov 1998 19:00:01 -0800 Steve and Others, If possible I would like to have the meeting when John Taber from New Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday 11 at 4PM. If we want to have the meeting during the day we could have it Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is ok, how about Wednesday Dec. 9? -Larry Cochrane Redwood City, PSN At 08:56 PM 11/24/98 -0800, you wrote: >Sorry for the delay in responding... YES! I'ed like to attend. Larry, >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and >earthquakes. > >Regards, Steve Hammond >PSN San Jose > > >Ken Navarre wrote: >> >> On Tue, 17 Nov 1998, Larry Cochrane wrote: >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe >> > what we can do is have a more informal diner get together at a restaurant >> > around here. We could do this sometime during the week when you, S-T >> > Morrissey, Edward, and anyone else who would like too attend, will be here. >> > >> > -Larry >> >> Let me know when & where and I'll try to be there. >> Ken _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Re: AMPLITUDE SIGNAL PROBLEM Date: Wed, 25 Nov 1998 19:54:32 -0800 Francesco I'm not an expert with noise but is your cable properly shielded? If you run a FFT what is the noise frequency? Regards Barry Francesco wrote: > Hi all.This is my problem:I use a vertical sensor, with a boom of ~ 5 > kg, a coil of ~9000 ohms (extract from a DC relay) a magnet and > Larry's ampli. I'm living in a small city, but the natural noise is > rather high, in particular during the day. But the most rilevant > problem is that the amplitude of the signal when occour an event is > very low. Yesterday is occourred a 3.5 Ml 48 km from my station and > the pick of signal was 400 data count. Too low !!!!If I add the gain > it will increase the noise. If I reduce it, the signal, obviusly, is > too low.Other: the maxium amplitude signal it was (always) 2000 counts > [5.9 Mb at 50km from me; 5.6 Ml at 581 km ecc.), with saturation. > !!!!!! All that, with the others sensor too. (horizontal long > period, horiz. short p.)I have located the sensors in my garage, > external from housein a quietly zone, with a radio cable of ~100 > ft. What I must do, to resolving these problems? Is there a system to > watch or calculate the effective gain of ampli and to add data > counts? _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Re: geophone suspension Date: Wed, 25 Nov 1998 19:42:54 -0800 Sean Thomas Thanks for the help regarding the geophone support. What I'm still unclear about was how do they prevent the mass from rubbing against the sides?(for example when it is tilted 10 degrees). I can't figure how the flectures are arranged. Is there an exploded view somewhere I could review to clarify this? Thanks Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ken Navarre Subject: Re: Northern California PSN meeting in December Date: Wed, 25 Nov 1998 19:53:30 -0800 (PST) On Wed, 25 Nov 1998, Larry Cochrane wrote: > If possible I would like to have the meeting when John Taber from New > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > 11 at 4PM. If we want to have the meeting during the day we could have it > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > ok, how about Wednesday Dec. 9? Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? Ken Navarre _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Steve Hammond Subject: Re: Northern California PSN meeting in December Date: Wed, 25 Nov 1998 22:35:44 -0800 How is Tuesday night 8th at 7:30 sound? That's the only night that week I can make it. I got a note from Jan Froom and he said Pete Rowe has his station back on-line and would also like to attend. Where do we want to get togehter? Regards, Steve Larry Cochrane wrote: > > Steve and Others, > > If possible I would like to have the meeting when John Taber from New > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > 11 at 4PM. If we want to have the meeting during the day we could have it > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > ok, how about Wednesday Dec. 9? > > -Larry Cochrane > Redwood City, PSN > > At 08:56 PM 11/24/98 -0800, you wrote: > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > >earthquakes. > > > >Regards, Steve Hammond > >PSN San Jose > > > > > >Ken Navarre wrote: > >> > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > >> > what we can do is have a more informal diner get together at a restaurant > >> > around here. We could do this sometime during the week when you, S-T > >> > Morrissey, Edward, and anyone else who would like too attend, will be > here. > >> > > >> > -Larry > >> > >> Let me know when & where and I'll try to be there. > >> Ken > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone leaf spring Date: Thu, 26 Nov 1998 01:30:24 -0600 (CST) Barry, The suspension springs in a geophone are actually etched diaphrams that are attached at the center hole and the rim. If you can imagine a circular disk with a large hole in the center as a circular leaf spring: it would not be very springy, but a mass (coil) installed in the center hole could only move up and down. Lateral movement toward the side rim is not possible. So to make it a spring, cut three semi- spiral groves or openings about 1mm wide in the disk; these openings in it should spiral (in the same direction) from about 2mm from the center hole to within 2mm of the outer rim. Space these at 120 degrees. Now the center can move up and down very easily, but still cannot move toward the rim (unless excessive force is used). Cut one out of paper. Such diaphram suspensions are very precise, and etching them from phosphor bronze sheet prevents any stressing that cutting would cause. These are used at both ends of the coil in the geophone, and they maintain clearances of much less than a millimeter. The problem with tilting a geophone is not that the coil will drag on the magnet or shell, but because tilting reduces the gravity vector, and the mass rises toward the upper stop, unless the spring is rigid enough to prevent this, as is the case in higher frequency geophones (10hz and up). I have a drawing of a Geospace phone, as well as a collection of various diaphram springs. I will scan them and post the image when I get a chance. ps If you want to dismantle a geophone, it is easily done without destroying it. Ask. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Roger Vaught Subject: Geophones Date: Thu, 26 Nov 1998 12:08:24 -0600 Geophones are actually very amazing instruments. You have to remember that while geophones have to be sensitive; they most certainly are not fragile instruments. Typically, they are attached at fixed intervals to a long cable, up to 1/4 mile in length, that is thrown in a large coil to and from the ground from a truck. The cable is dragged to the desired location and the geophones "planted" by sticking the rod into the ground and stomping it as deep as the ground will permit. Crewmembers by necessity are not small guys. You can imagine the various types of terrain they are dragged over and the various hardness of the ground they have to be "planted" in, all in as little time as possible and in all kinds of environments. After all this, they still have to perform their "delicate" function over and over. When Texaco still fielded seismic acquisition crews, the research center tested all brands of geophones by measuring their characteristics, then simulating the abuse they would undergo in the field by being thrown into in a cement-mixer type drum that tumbled and shook up and down, if I remember correctly, for 24 hours. The final characteristics were then compared. After the testing, the phones were typiclly discarded. Yeah, I took a few home to give as gifts. Mounted to a walnut base they looked nice, at least to guys like me (^g^). I'll look around and if I still have some, I'll report back to the list. Good, used, geophones for exploration work are not especially cheap. They should have been tested and if you buy one, you should request the results. On the other hand, I've bought old one's in a surplus electronic store for a buck a piece. For amateur seismological use, I suspect the cheap ones would work as well as the more expensive ones. Roger _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Thu, 26 Nov 1998 12:48:39 -0700 All- Because John Taber and Ted Blank & Jan Froom are going to present posters on Thursday, 10 Dec, and may be working down to the wire on Wednesday night in preparation, it might be more convenient for them to have the meeting on Thursday night when the pressure will be off and we can discuss the next PSN step. -Edward Larry Cochrane wrote: > Steve and Others, > > If possible I would like to have the meeting when John Taber from New > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > 11 at 4PM. If we want to have the meeting during the day we could have it > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > ok, how about Wednesday Dec. 9? > > -Larry Cochrane > Redwood City, PSN > > At 08:56 PM 11/24/98 -0800, you wrote: > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > >earthquakes. > > > >Regards, Steve Hammond > >PSN San Jose > > > > > >Ken Navarre wrote: > >> > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > >> > what we can do is have a more informal diner get together at a restaurant > >> > around here. We could do this sometime during the week when you, S-T > >> > Morrissey, Edward, and anyone else who would like too attend, will be > here. > >> > > >> > -Larry > >> > >> Let me know when & where and I'll try to be there. > >> Ken > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Thu, 26 Nov 1998 13:14:34 -0700 PSN- I am writing this after my previous email that suggested Thursday and then reading Steve Hammond's email below. I can also do Tuesday night. Because of the number of "indigenous PSN" members, it may be best to use USGS Menlo Park as a compromise site, halfway between San Francisco AGU and the South Bay. Like last year, I can have pizza delivered, and we will all have the chance to chat and eat and maybe give helpful suggestions to Ted&Jan about their AGU presentation on Thursday. I will be in San Francisco at AGU and I can chauffer people from there to USGS Menlo Park in a rented car. We need someone local to put all these schedules together. -Edward %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? Ken Navarre %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Steve Hammond wrote: > How is Tuesday night 8th at 7:30 sound? That's the only night that week > I can make it. I got a note from Jan Froom and he said Pete Rowe has his > station back on-line and would also like to attend. Where do we want to > get togehter? > > Regards, Steve > > Larry Cochrane wrote: > > > > Steve and Others, > > > > If possible I would like to have the meeting when John Taber from New > > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > > 11 at 4PM. If we want to have the meeting during the day we could have it > > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > > ok, how about Wednesday Dec. 9? > > > > -Larry Cochrane > > Redwood City, PSN > > > > At 08:56 PM 11/24/98 -0800, you wrote: > > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > > >earthquakes. > > > > > >Regards, Steve Hammond > > >PSN San Jose > > > > > > > > >Ken Navarre wrote: > > >> > > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > >> > what we can do is have a more informal diner get together at a restaurant > > >> > around here. We could do this sometime during the week when you, S-T > > >> > Morrissey, Edward, and anyone else who would like too attend, will be > > here. > > >> > > > >> > -Larry > > >> > > >> Let me know when & where and I'll try to be there. > > >> Ken > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: PSN and RESINE - Using the PSN-L list] Date: Thu, 26 Nov 1998 13:43:14 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". PS. and we will follow Luis's suggestion and include 'RESINE' in the subject of all our responses. Of course, if he has 'RESINE' in the subject of the email he sends, then our replies should contain 'RESINE' automatically. Edward Cranswick wrote: > All- > I think that Meredith's suggestions are excellent. Luis can explicitly > email to Meredith, Karl, John and myself and to any other RESINE-response > volunteers so that we can respond in near-realtime, and also to PSN-L so that > other PSN members can follow this process. I have a mail filter that will > separate the redundant PSN-L messages. Both John Lahr and I plan to be in my > office tomorrow, but just to cover ourselves in case of system problems, email > should be sent to John as well. > I will be here before Dec 27 15:00 and John will be here at 15:15. > I look forward to an interesting hour. > -Edward > > meredith lamb wrote: > > > Larry Cochrane wrote: as of 11/25/98 14:40, > > > > > Luis, Edward, John and Others, > > > > > > I would not use the list for the main way of communicating. I would use > > > private email address and CC the list. I did some timing test the other > > > night and it takes about 3 minutes to send a small message out to most of > > > the 270 members. If too many people respond to a question my system could > > > get backup very easily. > > > > > > Just a suggestion.... > > > > > > -Larry Cochrane > > > Redwood City, PSN > > > > > > > All, > > > > By following the message above, it would be obvious that, Luis Torres, > > would have to forward any messages to volunteers using at least 3 > > different email addresses (assuming Edward and John settle on > > one address). > > > > Without making a presumption, that may not even exist....Luis; > > does your email program allow more than one address? If it > > doesn't, we will have to make it per whatever you can do, or > > limit it to within your convenience. > > > > Maybe the smartest approach, in the case of limitations (?), > > would be too lessen the load of email addresses involved. Being as > > I have the least experience, perhaps I could be somewhat of a > > backup, just in case, other connections are not established. I > > would have no problem with this. Perhaps; it would make sense > > to also make sure prior to the exchange (say 15:00) that all the > > connections are there? > > > > It is also very possible, that the number of questions asked by > > the students could be overwhelming in number, and they may > > have to passed out. > > > > Perhaps in regard to the PSN mailing list, we could bundle up, > > a number of messages in one, and space it apart, to where there > > would not be a computer overwhelming amount.....but with the > > idea in mind that it is the students receiving the priority. > > > > The worst case scenario is where a computer system does down, > > and hopefully if would not involve you Luis. But they do go down > > at impromptu times. Its also possible that Edward & John jobs > > maybe necessary for them to be called away or not in attendance; > > I don't know for sure. > > > > Looking forward to this success. > > > > Any more suggestions or answers to the above? > > > > Thanks, Meredith Lamb > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Norman Davis WB6SHI Subject: Re: New Public Seismic Network Date: Thu, 26 Nov 1998 07:54:42 >to others who are interested. Another possibility is to install 3 remote sensors >at our repeater sites and have a 486 computer here to decode the telemetry. Of >course, I have absolutely no equipment at the moment so I am more or less >sitting back and reading the mail as it goes by. Getting seismic equipment here >is impossible. The most I can may be able to salvage is a computer. > >Wayne > wayne I put together a dc to tone encoder a while back that you my be able to make work on a system like that. I am not sure I still have the skematic as my system crashed a while back and lost a lot of stuff. I can recreate it from the actual circuit though. Let me know what you need. Maybe I can help. Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Re: geophone leaf spring Date: Thu, 26 Nov 1998 22:01:29 -0800 Sean Thomas Makes sense now, thanks for the explaination. I did get a geophone from the electronics supply for around $9. It picked up the Redding event well. I was afraid to dismantle it but maybe I'll try or get an other. I like the idea of increasing the period as you have mentioned earlier. The units are so compact. I have looked back at several of my teleseismic events and 30 sec seems an acceptable low frequency. Regards Barry S-T Morrissey wrote: > Barry, > > The suspension springs in a geophone are actually etched diaphrams > that are attached at the center hole and the rim. If you can imagine > a circular disk with a large hole in the center as a circular leaf > spring: it would not be very springy, but a mass (coil) installed in > the center hole could only move up and down. Lateral movement toward > the side rim is not possible. So to make it a spring, cut three semi- > spiral groves or openings about 1mm wide in the disk; these openings > in it should spiral (in the same direction) from about 2mm from the > center hole to within 2mm of the outer rim. Space these at 120 degrees. > Now the center can move up and down very easily, but still cannot move > toward the rim (unless excessive force is used). Cut one out of paper. > > Such diaphram suspensions are very precise, and etching them from phosphor > bronze sheet prevents any stressing that cutting would cause. These are > used at both ends of the coil in the geophone, and they maintain clearances > of much less than a millimeter. The problem with tilting a geophone is > not that the coil will drag on the magnet or shell, but because tilting > reduces the gravity vector, and the mass rises toward the upper stop, > unless the spring is rigid enough to prevent this, as is the case in > higher frequency geophones (10hz and up). > > I have a drawing of a Geospace phone, as well as a collection of > various diaphram springs. I will scan them and post the image when I > get a chance. > > ps If you want to dismantle a geophone, it is easily done without > destroying it. Ask. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: New Public Seismic Network Date: Thu, 26 Nov 1998 23:51:53 -0700 > > While our amateur club is willing to participate, they are all depending on me > to get something started. I am more or less leaning towards setting up a > seismometer here at home, get used to its operation and then pass the knowledge > to others who are interested. Another possibility is to install 3 remote sensors > at our repeater sites and have a 486 computer here to decode the telemetry. Of > course, I have absolutely no equipment at the moment so I am more or less > sitting back and reading the mail as it goes by. Getting seismic equipment here > is impossible. The most I can may be able to salvage is a computer. > > Wayne > Wayne, I would dare say that because you belong to an amateur radio club, that very likely your electronics knowledge, already far surpasses my knowledge-ha. You're likely more than a step up on alot of people. I note your common AC power is 220-240 volts at 50 hz. Yes....if you can salvage or obtain a computer, that would be ordinarily be the most difficult part. Obtaining pieces and parts is forever a part of this avocation, what with individuals interests and the big variety of possible equipment that are in use. The really main part would of course be the A/D card, and that would normally have to purchased from outside your area, by yourself and/or with the contributions of others in the group. Being as its an amateur group, hopefully you have or can use a receiver for a time station....but even that can be added later in reality. I can donate to you a geophone. Its a Geosource 14 hz unit. Actually I should say; my brother Bob, and I; as it was given too me by him earlier in the year. As I don't really have a use for it, in my nonseismic area (in general), it would really help you more than me. For your area, it would be much more useful. With it, is a electronic amplifier of sorts....and a switch and gain pot. The gain can be adjusted. Perhaps it will give you alittle more interest while the other parts and pieces are being accumulated. Its a 9 volt DC battery (portable) LED flashing type indicator combo. I will need your exact mailing address, and best method of shipment. Do have more questions. I presume there is no local or government facility involved in seismology? If there isn't, this sounds like it could be very hazardious, what with the local increased activity there. I'am glad you are concerned for sure. I couldn't see any reference to volcanoes or the boiling lake you mentioned.....any internet reference known? I note your currency is the Eastern Carribean dollar, but that the U.S. dollar is also used frequently. It sounds like it might be a good idea to indeed plan to put or makeup your seismograph at home to begin with; as it appears you have the most interest initally. According to the web tourist sites, your island does indeed look like a paradise. Sometimes in the winter here....I will think of it when its snowing here-ha. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: RESINE Email Meeting Date: Fri, 27 Nov 1998 08:29:00 -0700 Good morning, John and Ed are here in Golden, Colorado, watching for mail from Luis and RESINE. John and Ed -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: RESINE - is Luis Torres sending anything? Date: Fri, 27 Nov 1998 09:03:20 -0700 All- Has anyone received email from Luis Torres in the last 30 minutes? -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: ACole65464@....... Subject: Re: RESINE - is Luis Torres sending anything? Date: Fri, 27 Nov 1998 11:08:01 EST Ed, Not yet. Allan Coleman Edmonds, Wa. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: RESINE meeting Date: Fri, 27 Nov 1998 08:10:40 -0800 Greetings to all RESINE delegates -- Apparently, any messages from your meeting are not getting to me, so I am sending this message "in the blind." I am Karl Cunningham, and live in La Mesa, a small town just east of San Diego in Southern California, USA. It is a pleasure for me to be able to communicate with you today, and I wish you all the best success in developing and operating your own seismometers. Setting up seismometers can be a very enjoyable and rewarding endeavor, and is not as hard as it seems at first. I have been a member of the PSN for about 2 years and have operated a home-made seismometer in my garage for about 1-1/2 years. The type of seismometer I operate is a "force-balance accelerometer". Accelerometers are more sensitive to local earthquakes, and this works out well since there are many faults within 200km of here. The output is also "integrated" to velocity to detect more distant events too. My instrument detects an average of 4 small local earthquakes per day, and some days as many as 20. A description of my equipment is at http://www.jps.net/karlc . My instrument is quite a bit more complicated than what is needed to detect earthquakes from around the world. The Lehman type of instrument will serve very well in detecting both local and teleseismic (distant) events and is fairly simple to build and operate. Please do take advantage of the PSN members' knowledge and experience in building and operating seismometers. Do not be afraid to ask about any aspect of construction, location, operation, etc. We are a friendly group and enjoy sharing what we've learned. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Test Date: Fri, 27 Nov 1998 09:21:55 -0700 (MST) ----- Begin Included Message ----- From Luis.Torres@...... Fri Nov 27 09:19 MST 1998 Date: Fri, 27 Nov 1998 16:19:58 +0000 From: torres@...... MIME-Version: 1.0 To: John Lahr , Karl Cunningham <", Larry Cochrane , meredith lamb <" Subject: Test Content-Transfer-Encoding: 7bit Hello: The session is starting! Are you here? ----- End Included Message ----- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: RESINE - Welcome Date: Fri, 27 Nov 1998 09:28:10 -0700 Members of RESINE: I welcome all the members of RESINE. Please send email to me as well . -Edward Cranswick U.S. Geological Survey/Public Seismic Network John Lahr wrote: > ----- Begin Included Message ----- > > >From Luis.Torres@...... Fri Nov 27 09:19 MST 1998 > Date: Fri, 27 Nov 1998 16:19:58 +0000 > From: torres@...... > MIME-Version: 1.0 > To: John Lahr , Karl Cunningham <", > Larry Cochrane , > meredith lamb <" > Subject: Test > Content-Transfer-Encoding: 7bit > > Hello: > The session is starting! > Are you here? > > ----- End Included Message ----- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Re: Test Date: Fri, 27 Nov 1998 09:31:39 -0700 (MST) Luis, In addition to sending to cranswick@.................. lahr@.................. psnseismograph52@.......... karlc@............... please cc the whole PSN list at: psn-l@.............. Thanks, JCLahr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: correction Date: Fri, 27 Nov 1998 09:35:00 -0700 (MST) > From MAILER-DAEMON Fri Nov 27 09:32 MST 1998 > From: John Lahr Luis, Note change to Karl's Email address, below: > > Luis, > > In addition to sending to > > cranswick@.................. > lahr@.................. > psnseismograph52@.......... > karlc@....... (corrected) > > please cc the whole PSN list at: psn-l@.............. > > Thanks, > > JCLahr > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham Subject: Re: New Public Seismic Network Date: Fri, 27 Nov 1998 12:32:46 -0400 Norman Thank you for your interest. Any help that I can get will be greatly appreciated. All this stuff sounds new to me but I have no choice but to learn as much as I can. Wayne Norman Davis WB6SHI wrote: > >to others who are interested. Another possibility is to install 3 remote > sensors > >at our repeater sites and have a 486 computer here to decode the > telemetry. Of > >course, I have absolutely no equipment at the moment so I am more or less > >sitting back and reading the mail as it goes by. Getting seismic equipment > here > >is impossible. The most I can may be able to salvage is a computer. > > > >Wayne > > > > wayne > I put together a dc to tone encoder a while back that you my be able to > make work on a system like that. I am not sure I still have the skematic as > my system crashed a while back and lost a lot of stuff. I can recreate it > from the actual circuit though. Let me know what you need. Maybe I can help. > > Norman Davis WB6SHI > Shingle Springs, Ca > normd@............. > http://www.directcon.net/normd/index.htm > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: Apparently a no go with Resine connecgtion] Date: Fri, 27 Nov 1998 10:23:49 -0700 Meredith- I agree that nothing seems to be happening at present, but it was an excellent exercise, and we will know more about how to do it next time. -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Getting nothing. Never got the original "Hello: the session is starting! Are you there?" msg. See the last mailer-Daemon rejection to torres@....... Connection probably a no go. Presume its the same with you all?? We tried.... Maybe in the future, it will work out. Thanks, Meredith Lamb From: Edward Cranswick Subject: [Fwd: 1998 Public Seismic Network meeting at USGS, Menlo Park] Date: Fri, 27 Nov 1998 10:40:42 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Kristine & Karl- Last year the Northern California members of the Public Seismic Network (PSN) had their meeting annual meeting in conjunction with the Fall AGU meeting, and the PSN meeting was held at USGS Menlo Park. We would like to have another such PSN meeting during AGU this year, and it would be convenient and useful to have the meeting at USGS Menlo Park again. We have not pinned down the precise date so far, but it will be held one of the evenings of the AGU week 7-10 Dec (Monday-Thursday). I would be in attendance at the USGS Menlo Park and would represent the USGS. Please let me know if this can be arranged. -Edward Edward Cranswick wrote: > Kristine & Carl- > Thank you very much for making the necessary arrangements that allowed > the Public Seismic Network (PSN) to use the Building 8 Conference Room > for the Northern California PSN meeting on Saturday, 20 Dec 1997. > Eleven members of the PSN attended the meeting, and I believe it was > quite successful. > I wish you both Happy Holidays and a Happy New Year. > -Edward > > Kristine Estrada wrote: > > > > Carl/Ed: > > > > I have alerted the Safety/Security office of this Saturday meeting in Building 8, > > Room 8111; the guard will be notified. I penciled the meeting in for "all day". > > Let me know the time your group plans to arrive and depart. > > Thanks, > > Kristine, x4140 > > > > Carl Mortensen wrote: > > > > > Ed - > > > > > > Because of the construction on building 3, building 8 has the > > > largest conference room on campus, so it has been transferred to the OPS > > > Division to administer. The person who takes the reservations is : > > > > > > name: Estrada, Kristine R > > > email: kestrada@........ (kestrada@............ > > > phone: 650-329-4140 > > > address: 345 Middlefield Road, MS 225 > > > : Menlo Park, CA 94025 > > > office_location: 01, Room 117 > > > department: OPS > > > > > > I've cc'd her on this message so that she can make the reservations > > > if it's available. > > > > > > Regards, > > > > > > Carl > > > > > > >Carl- > > > > Members of the Public Seismic Network (PSN) from the San Francisco Bay > > > >Area are planning to hold a meeting on Saturday, 20 December 1997, and > > > >John Lahr suggested that I contact you about the possibility of having > > > >that meeting in Building 8 of USGS, Menlo Park. Several years ago, in > > > >1993 I believe, Joe Sena and Jerry Eaton sponsored a similar PSN meeting > > > >that was held in Building 8 on a Saturday so that PSN members who worked > > > >during the week would be able to attend. > > > > We will be presenting a PSN poster at AGU on Friday, 12 Dec, and I will > > > >be in the Bay Area to work with the PSN the following week (14-20 dec) > > > >and to attend on the PSN meeting that Saturday. So, I will be available > > > >as the USGS representative to be responsible for the visitors. I > > > >anticipate that there would be 10-40 attendees. > > > > Please let me know if we may hold the PSN meeting at the USGS, Menlo > > > >Park, on Saturday, 20 Dec 1997. > > > >-Edward > > > > > > > >-- > > > >Edward Cranswick Tel: 303-273-8609 > > > >US Geological Survey, MS 966 Fax: 303-273-8600 > > > >PO Box 25046, Federal Center cranswick@........ > > > >Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > > > ____________________________________________________________________ > > > Carl Mortensen e-mail: cmortensen@.................. > > > US Geological Survey Phone: 650-329-4856 > > > 345 Middlefield Road, MS/977 Fax: 650-329-5163 > > > Menlo Park, CA 94025 > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Wayne Abraham Subject: Re: New Public Seismic Network Date: Fri, 27 Nov 1998 13:37:59 -0400 meredith lamb wrote: > I would dare say that because you belong to an amateur radio club, that very likely > your electronics knowledge, already far surpasses my knowledge-ha. You're likely > more than a step up on alot of people. I note your common AC power is 220-240 volts > at 50 hz. I do have basic electronics knowledge and can solder two wires together. I also know how to use a multimeter Ha ha. you are correct, our voltage is 220-240 VAC, 50hz. Step-down transformers are widely available on island but they convert to 110 VAC, 50 hz and not the 60 hz you use in the USA. > Yes....if you can salvage or obtain a computer, that would be ordinarily be the most > difficult part. Obtaining pieces and parts > is forever a part of this avocation, what with individuals interests and the big > variety of possible equipment that are in use. The really main part would of course > be the A/D card, and that would normally have to purchased from outside your area, > by yourself and/or with the contributions of others in the group. Being as its an > amateur group, hopefully you have or can use a receiver for a time station....but > even that can be added later in reality. > I can donate to you a geophone. Its a Geosource 14 hz unit. Actually I should say; > my brother Bob, and I; as it was given too me by him earlier in the year. As I > don't really have a use for it, in my nonseismic area (in general), it would really > help you more than me. For your area, it would be much more useful. With it, is a > electronic amplifier of sorts....and a switch and gain pot. The gain can be > adjusted. Perhaps it will give you alittle more interest while the other parts and > pieces are being accumulated. Its a 9 volt DC battery (portable) LED flashing type > indicator combo. I am not sure what the frequency on the units stand for. I was told by a seismologist who is working at monitoring our volcanoes that 1 hz units are the ones needed to monitor the quakes characteristic to volcanic activity. (Correct me if I'm wrong). I was also told that anything above 10 hz is useless. Maybe you can attempt to explain this to me also. > I will need your exact mailing address, and best method of shipment. My mailing address is: Wayne Abraham 1430 Rodney Street Portsmouth Commonwealth of Dominica West Indies Shipping can be via air mail or parcel post. This, I guess, will be the cheapest. FEDEX, UPS and DHL operate here but their costs are rather high. > Do have more questions. I presume there is no local or government facility involved > in seismology? If there isn't, this sounds like it could be very hazardious, what > with the local increased activity there. I'am glad you are concerned for sure. > Our 10 (or possibly more) volcanoes are being monitored by the Seismic Research Unit of the University of the West Indies which is based in Trinidad. Any information regarding seismic activity has to be chaneled through the Government Information Service before it can be released to the public (bad news). I like to know what's happening around me. > I couldn't see any reference to volcanoes or the boiling lake you mentioned.....any > internet reference known? Try this site: http://community.wow.net/sru/default.htmI tried it a while ago but default.htm could not be located. I guess they were updating it. You may also try: http://www.volcano.si.edu/gvp/volcano/region16/index.htm This site gives a short discription of two of the 10 volcanoes on Dominica. This site may also be of some interest: http://www.cdera.org/sitreps/domquakes.htm > > > I note your currency is the Eastern Carribean dollar, but that the U.S. dollar is > also used frequently. The conversion rate is 2.71 East Caribbean dollars to 1 US dollar. > > > It sounds like it might be a good idea to indeed plan to put or makeup your > seismograph at home to begin with; as it appears > you have the most interest initally. This is the way it looks and it seems like I will have to bear the major costs initially also. I am thinking of a computer upgrade from my Pentium 100 to a 300 or better. This will make my 100 motherboard available for use in data logging. All I will need to get is a power supply ( I don't need a case) and a monitor. Everything else is built in on the motherboard. I have spare 200mb HDD hanging around somewhere. > According to the web tourist sites, your island does indeed look like a paradise. > Sometimes in the winter here....I will think of it when its snowing here-ha. > It does get pretty cold in wintertime down here - sometimes as low as 65 degrees at nights but it quickly returns to 80 degrees in the day. Wayne J73WA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: torres@...... Subject: Re: RESINE - Welcome Date: Fri, 27 Nov 1998 19:07:14 +0000 Edward Cranswick wrote: > > Members of RESINE: > > I welcome all the members of RESINE. > Please send email to me as well . > > -Edward Cranswick > U.S. Geological Survey/Public Seismic Network > > John Lahr wrote: > > > ----- Begin Included Message ----- > > > > >From Luis.Torres@...... Fri Nov 27 09:19 MST 1998 > > Date: Fri, 27 Nov 1998 16:19:58 +0000 > > From: torres@...... > > MIME-Version: 1.0 > > To: John Lahr , Karl Cunningham <", > > Larry Cochrane , > > meredith lamb <" > > Subject: Test > > Content-Transfer-Encoding: 7bit > > > > Hello: > > The session is starting! > > Are you here? > > > > ----- End Included Message ----- > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". I apologize. A few things went wrong with the communications and I thought you had received a message about it, three hours ago!. Some 80 people were here. Luis _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: RESINE questions Date: Fri, 27 Nov 1998 12:19:40 -0700 (MST) > From Luis.Torres@...... Fri Nov 27 12:12 MST 1998 > Date: Fri, 27 Nov 1998 19:12:40 +0000 > From: torres@...... > MIME-Version: 1.0 > To: Karl Cunningham > CC: meredith lamb , > Edward Cranswick , > john lahr > > The session was very interesting with between 5-20 people from each > school. It was not me sending the messages under my name, because there > were too many logistics problems to solve. To last of which was that I > have to go into the rush our to get the 5 people to catch a bus to > Algarve which is some 300 Km from here. > > Questions were: 1) How to seismologists know about depth. In plan view > we understand it, intersections of at least 3 circles from the S-P > difference, but depth?. > 2) SDR- how do you set up thresholds to avoid getting noise and separate > it from the events. two schools compaliend they could not get the > thresholds in SDR to work > > Luis > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Re: Resine question #1 Date: Fri, 27 Nov 1998 12:45:34 -0700 (MST) RESINE Question 1) How to seismologists know about depth? In plan view we understand it, intersections of at least 3 circles from the S-P difference, but depth?. I'll take a stab at this. Consider three stations located 6 km apart at the points of an equilateral triangle. An earthquake 8 km deep occurs beneath one of the stations. The total distance to that stations will be 8 km, but the distance to the other two stations will be sqrt(8*8 + 6*6) = 10 km. The s-p intervals would be approximately 8/8 = 1 s at the closest station and 10/8 = 1.25 s at the other two. To find the location of the earthquake given just the s-p intervals of 1, 1.25, and 1.25 one would have to consider not circles on a map but bowls with radii of 8, 10, and 10 km centered beneath the stations. In the late 1960's when some earthquakes were still being located graphically, the technique was to try various trial depths. For each trial depth, the circles could be drawn. If they did non meet in a point, or a very small region, then a higher or lower depth was used. In the example give above, if the trial depth was 4 km, then the radii would have been sqrt(8*8 - 4*4) = 6.9 km and sqrt(10*10 - 4*4) = 9.2 km. These three circles would overlap too much, so a deeper depth would be used for the next trial. Today computer programs are used to find the epicenter, depth, and origin time, using the method of iterative least squares first described by Geiger (Bull. St. Louis Univ. 8, 60-71) in 1912. Hope this helps, JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: torres@...... Subject: Re: RESINE questions Date: Fri, 27 Nov 98 20:52:57 Dear all, I will summarize the session during the weekend and hope that despite the frustration of sitting there miles away and nothing happening will be compensated by hearing that the session was very good. Methods for calibrating that Lehmans were discussed. The meaning of the events people were picking in their tectonic environment, etc. In particular the slides and tranparencies on buildings collapsing and why they do and demos with small models in shake home-made shake tables as well small models to show the natural response of buildings. The pictures and pages of the schools will not be put on the nert immeadiatly but by the end of the year I hope to get it done. Other questions: 3) Is there a school networks in the US and is it affiliated to PSN? 4) Orientation of the Lehaman. People asked if E-W for example was for the direction of oscilation or for the axis of the boom. 5) What have amateur people learned by monitoring earthquakes like we are trying to do. Is this not an advanced subject for common people like teachers and K-10, K-12 students, as the records seem so complex? 6) Using several components. Does it give so much more info?. The expert commented that for one component usually it is the vertical component hat is monitored, while with ours we were getting an horizontal one. It would not matter much if they were E-W or N-S. Luis _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: torres@...... Subject: Re: RESINE - Welcome Date: Fri, 27 Nov 98 20:55:35 Hi all, I have to leave now, but I will get back during the weekend. Thank you all and agani my apologies, Luis _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: New Public Seismic Network Date: Fri, 27 Nov 1998 13:03:59 -0700 PSN- Inspired in part by a desire to avoid a white Xmas in Colorado and partly by Wayne Abraham's email about the interest in Dominica of establishing a PSN, a friend (she is a geologist) and I are going to spend Xmas in Dominica. We will be departing Denver, Colorado on 20 Dec and arriving on Liat FLT#321 at DOM (Melville Hal-Dom, Dominica, Dominica) on 21 Dec at 06:35, and we return on 31 Dec. We can probably carry a small amount of equipment, maybe as much as 50 kg (100 lbs), with us to Wayne Abraham in Dominica. If you have something you would like to be transported there, please let me know. I just looked at the one of the websites that Wayne referenced below, and I suddenly understand that there is some dramatic seismic activity occurring in Dominica. I will check into this further. -Edward Wayne Abraham wrote: > meredith lamb wrote: > > > I would dare say that because you belong to an amateur radio club, that very likely > > your electronics knowledge, already far surpasses my knowledge-ha. You're likely > > more than a step up on alot of people. I note your common AC power is 220-240 volts > > at 50 hz. > > I do have basic electronics knowledge and can solder two wires together. I also know > how to use a multimeter Ha ha. you are correct, our voltage is 220-240 VAC, 50hz. > Step-down transformers are widely available on island but they convert to 110 VAC, 50 > hz and not the 60 hz you use in the USA. > > > Yes....if you can salvage or obtain a computer, that would be ordinarily be the most > > difficult part. Obtaining pieces and parts > > is forever a part of this avocation, what with individuals interests and the big > > variety of possible equipment that are in use. The really main part would of course > > be the A/D card, and that would normally have to purchased from outside your area, > > by yourself and/or with the contributions of others in the group. Being as its an > > amateur group, hopefully you have or can use a receiver for a time station....but > > even that can be added later in reality. > > > I can donate to you a geophone. Its a Geosource 14 hz unit. Actually I should say; > > my brother Bob, and I; as it was given too me by him earlier in the year. As I > > don't really have a use for it, in my nonseismic area (in general), it would really > > help you more than me. For your area, it would be much more useful. With it, is a > > electronic amplifier of sorts....and a switch and gain pot. The gain can be > > adjusted. Perhaps it will give you alittle more interest while the other parts and > > pieces are being accumulated. Its a 9 volt DC battery (portable) LED flashing type > > indicator combo. > > I am not sure what the frequency on the units stand for. I was told by a seismologist > who is working at monitoring our volcanoes that 1 hz units are the ones needed to > monitor the quakes characteristic to volcanic activity. (Correct me if I'm wrong). I > was also told that anything above 10 hz is useless. Maybe you can attempt to explain > this to me also. > > > I will need your exact mailing address, and best method of shipment. > > My mailing address is: > Wayne Abraham > 1430 Rodney Street > Portsmouth > Commonwealth of Dominica > West Indies > > Shipping can be via air mail or parcel post. This, I guess, will be the cheapest. > FEDEX, UPS and DHL operate here but their costs are rather high. > > > Do have more questions. I presume there is no local or government facility involved > > in seismology? If there isn't, this sounds like it could be very hazardious, what > > with the local increased activity there. I'am glad you are concerned for sure. > > > > Our 10 (or possibly more) volcanoes are being monitored by the Seismic Research Unit > of the University of the West Indies which is based in Trinidad. Any information > regarding seismic activity has to be chaneled through the Government Information > Service before it can be released to the public (bad news). I like to know what's > happening around me. > > > I couldn't see any reference to volcanoes or the boiling lake you mentioned.....any > > internet reference known? > > Try this site: http://community.wow.net/sru/default.htmI tried it a while ago but > default.htm could not be located. I guess they were updating it. You may also try: > http://www.volcano.si.edu/gvp/volcano/region16/index.htm > This site gives a short discription of two of the 10 volcanoes on Dominica. > > This site may also be of some interest: http://www.cdera.org/sitreps/domquakes.htm > > > > > > > I note your currency is the Eastern Carribean dollar, but that the U.S. dollar is > > also used frequently. > > The conversion rate is 2.71 East Caribbean dollars to 1 US dollar. > > > > > > > It sounds like it might be a good idea to indeed plan to put or makeup your > > seismograph at home to begin with; as it appears > > you have the most interest initally. > > This is the way it looks and it seems like I will have to bear the major costs > initially also. I am thinking of a computer upgrade from my Pentium 100 to a 300 or > better. This will make my 100 motherboard available for use in data logging. All I > will need to get is a power supply ( I don't need a case) and a monitor. Everything > else is built in on the motherboard. I have spare 200mb HDD hanging around somewhere. > > > According to the web tourist sites, your island does indeed look like a paradise. > > Sometimes in the winter here....I will think of it when its snowing here-ha. > > > > It does get pretty cold in wintertime down here - sometimes as low as 65 degrees at > nights but it quickly returns to 80 degrees in the day. > > Wayne J73WA > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: RESINE questions Date: Fri, 27 Nov 1998 13:09:21 -0700 Luis- Thank you for the summary. I am sorry that we missed participating, but it sounds as if you had a busy and interesting conference despite problems with the Internet. Next time we will be "virtually" there. -Edward torres@...... wrote: > Dear all, > > I will summarize the session during the weekend and hope that despite the frustration of > sitting there miles away and nothing happening will be compensated by hearing that the > session was very good. > > Methods for calibrating that Lehmans were discussed. The meaning of the events > people were picking in their tectonic environment, etc. In particular the slides and > tranparencies on buildings collapsing and why they do and demos with small models in > shake home-made shake tables as well small models to show the natural response of > buildings. > > The pictures and pages of the schools will not be put on the nert immeadiatly but by the > end of the year I hope to get it done. > > Other questions: > > 3) Is there a school networks in the US and is it affiliated to PSN? > 4) Orientation of the Lehaman. People asked if E-W for example was for the direction of > oscilation or for the axis of the boom. > 5) What have amateur people learned by monitoring earthquakes like we are trying to > do. Is this not an advanced subject for common people like teachers and K-10, K-12 > students, as the records seem so complex? > 6) Using several components. Does it give so much more info?. The expert commented > that for one component usually it is the vertical component hat is monitored, while with > ours we were getting an horizontal one. It would not matter much if they were E-W or > N-S. > > Luis > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham Subject: Re: New Public Seismic Network Date: Fri, 27 Nov 1998 16:08:47 -0400 Meredith You may find photos of the Boiling Lake and other photos of interest about Dominica at: http://www.delphis.dm/photos.htm Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: New Public Seismic Network Date: Fri, 27 Nov 1998 13:25:52 -0700 Wayne Abraham wrote: > > I am not sure what the frequency on the units stand for. I was told by a seismologist > who is working at monitoring our volcanoes that 1 hz units are the ones needed to > monitor the quakes characteristic to volcanic activity. (Correct me if I'm wrong). I > was also told that anything above 10 hz is useless. Maybe you can attempt to explain > this to me also. The better choice would of course be the 1hz geophone. Trouble is, with equipment, the desired piece and whats available (and price), usually mean the amateur can't afford the very best. So......, I would still think that the 14hz, will still pick up the stronger shocks, and help start your station and generate more interest from the group. Being as the Island is some ~ 28 miles in diameter, and with the recent actitivity, I'am sure you will pick up some quakes....... eventually with it. I've had to pick up pieces and parts all my life in this stuff, and its been often a discouraging haul over time, but with mainly perserverance, things usually come around sooner or later. Of course, with all my yak; one has to remember that there is alot of other types of homebrew seismometers, one can build from material available in hardware stores and etc. > > > Our 10 (or possibly more) volcanoes are being monitored by the Seismic Research Unit > of the University of the West Indies which is based in Trinidad. Any information > regarding seismic activity has to be chaneled through the Government Information > Service before it can be released to the public (bad news). I like to know what's > happening around me. I would imagine that would be like waiting for Bill Clinton to tell the truth, after the fact-ha.....everyone could do a slow burn in the meantime. > > > > I couldn't see any reference to volcanoes or the boiling lake you mentioned.....any > > internet reference known? > > Try this site: http://community.wow.net/sru/default.htmI tried it a while ago but > default.htm could not be located. I guess they were updating it. You may also try: > http://www.volcano.si.edu/gvp/volcano/region16/index.htm > This site gives a short discription of two of the 10 volcanoes on Dominica. > > This site may also be of some interest: http://www.cdera.org/sitreps/domquakes.htm The two latter sites were fairly good, and interesting. I do note the detached attitude of the reports, and can see your concern there. This is the way it looks and it seems like I will have to bear the major costs initially also. I am thinking of a computer upgrade from my Pentium 100 to a 300 or > better. This will make my 100 motherboard available for use in data logging. All I > will need to get is a power supply ( I don't need a case) and a monitor. Everything > else is built in on the motherboard. I have spare 200mb HDD hanging around somewhere. > > > According to the web tourist sites, your island does indeed look like a paradise. > > Sometimes in the winter here....I will think of it when its snowing here-ha. > > > > It does get pretty cold in wintertime down here - sometimes as low as 65 degrees at > nights but it quickly returns to 80 degrees in the day. Put on your eskimo parka by all means-ha. I'll ship the 14hz "clunker" out within afew days. Seems to me, I've heard that any 60hz equipment, usually doesn't have a problem with using 50hz; as its fed through and evened out via the power supply anyway, for DC use...but...I could be electronically and casastropically wrong? Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: New Public Seismic Network Date: Fri, 27 Nov 1998 14:41:20 -0700 Edward Cranswick wrote: > PSN- > Inspired in part by a desire to avoid a white Xmas in Colorado and partly by Wayne > Abraham's email about the interest in Dominica of establishing a PSN, a friend (she is a > geologist) and I are going to spend Xmas in Dominica. We will be departing Denver, > Colorado on 20 Dec and arriving on Liat FLT#321 at DOM (Melville Hal-Dom, Dominica, > Dominica) on 21 Dec at 06:35, and we return on 31 Dec. We can probably carry a small > amount of equipment, maybe as much as 50 kg (100 lbs), with us to Wayne Abraham in > Dominica. If you have something you would like to be transported there, please let me > know. > I just looked at the one of the websites > that Wayne referenced below, and I suddenly understand that there is some dramatic seismic > activity occurring in Dominica. I will check into this further. > -Edward > Edward, Fantastic stuff....and partly funtastic envy on my part.-ha. I'll scroung around my garage, for some stuff he maybe able to use; but unfortunately it won't include a A/D card...tidbits probably. Here you have donated money for students attendance in California, and etc., and etc....you are or should be nominated for government employee of the year in my opinion. Total dedication..... Wayne Abraham, Ok on the Boiling lake reference, I'll have to check it out more later. Good man coming your way. Have met him and seen him acouple times. Enjoy. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: AMPLITUDE SIGNAL PROBLEM Date: Sat, 28 Nov 1998 00:07:05 -0700  

Francesco wrote:

 Hi all.This is my problem:I use a vertical sensor, with a boom of ~ 5 kg, a coil of ~9000 ohms (extract from a DC relay) a magnet and Larry's ampli. I'm living in a small city, but the natural noise is rather high, in particular during the day. But the most rilevant problem is that the amplitude of the signal when occour an event is very low. Yesterday is occourred a 3.5 Ml 48 km from my station and the pick of signal was 400 data count. Too low !!!!If I add the gain it will increase the noise. If I reduce it, the signal, obviusly, is too low.Other: the maxium amplitude signal it was (always) 2000 counts [5.9 Mb at 50km from me; 5.6 Ml at 581 km ecc.), with saturation. !!!!!!     All that,  with the others sensor too. (horizontal long period, horiz. short p.)I have located the sensors in my garage, external from housein a quietly zone, with a radio cable of ~100 ft. What I must do, to resolving these problems? Is there a system to watch or calculate the effective gain of ampli and to add data counts? Thank to all for the help Francesco Nucera    -  Osimo, Italy


Francesco,

Just an opinion....but, it might be that you will have to live with
the influence of the environmental noise, because of your proximity
to the noise sources.  Other than relocating the instruments via a
friends/relatives quieter location; there maybe no location change
choice.

The magnitude of the quake has alot of influence on what you
successfully record obviously.  I have pretty much the same
problem being in a city.  Nearby smaller quakes are buried in noise
and I usually don't bother.  Quakes like the mag 5's recently in
California I can record, but a fast inspection will show an average
background with alot of noise.  Even bigger distance quakes, can
have amplitudes here which are buried in background noise.

So far this year, my best or quietest time was in the summer
months, and the amplitude of the noise was very low compared
to other times.

With the onset of fall, I easily get hurricane effect microseisms,
that really block things out in a hurry.  Sometimes, I simply shut
it all down during those times, and this can go on for days at a
time.  The amplitude here now, is roughly 3x what it was in the
summer time.

Another possiblity, but for which I have no real experience is to
electronically reduce the noise via a filter, which could be resistors
and capacitors in various configurations.  In the good old drum
(chart) recorder days, I would put a discharged capacitor across
the input terminals to the first amplifier of roughly 1 to 5 microfarad,
and this would kill most of the noise; and then somewhat increase
the gain.  The good is that got rid of the high frequency noise; and
the bad was that made the P wave stuff attenuated of course.  I
found that what worked for one chart recorder, doesn't always
work for the next....probably capacitor or component problems
within the chart recorder amplifiers.  You might try some very low
value capacitors (like ceramic disc etc) and see the effects, then
adjust upward or downward to whatever you can live with.  Always
totally discharge the caps before putting them in...there will be a
short period of the circuit charging the installed capacitor.

BUT.....I have not done this, with my present setup, which is very
similar to yours, because, the total span of the computer recording
is so large compared to the chart recorder, that I don't have to do
this.  My background microseism is usually the 6 second stuff
interspersed with too fast moving cars hitting a dip about 50 feet
away, and setting off the trigger-ha.

Barry Lotz wrote asking about your cable and whether or not it
was shielded.  Shielded cable is preferred.  It could also be that
noise in entering areas that maynot have shielding....like noisy
appliances close to the pre-amp (which I presume is in a metal
box), or between that and the computer?  Both of my S-G's still
need shielded wire....this would likely cut the noise in half.....
some day.....ha.

More far-fetched is that your pre-amp power supply may need
more capacitance, or, it could be part of the noise source.

Anyway....I hope it will be somewhat resolved there.

Meredith Lamb
 
 
  _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ian & Liz Subject: Re: AMPLITUDE SIGNAL PROBLEM Date: Fri, 27 Nov 1998 22:12:56 -1000 Hi, Meredith, could you enlarge a bit on what "hurricane effect microseisms" are? Thanks. Francesco, it may be with doing an fft of your noise signal to see what components it has. If you are unlucky, it will just be spread across your sampling frequencies, with a rising 1/f approaching 0 Hz. If you are lucky, then it may be mains frequency and components, or something else from a particular source. If you can identify it, it may be easier to reduce. You can also experiment by moving things around and seeing what happens to the noise spectrum and its components. If you have a maths pc package like Mathcad and access to the raw data, it's easy to produce these plots. cheers Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: 6-second microseisms Date: Sat, 28 Nov 1998 12:58:17 -0600 (CST) Re: 6-second microseisms and hurricanes: An interesting phenomenon in the eastern USA is that when a large wind storm due to a deep barometric low occurs off the east coast, particularly off of New England, the wave energy pounding on the continental shelf propagates through the lithosphere under the eastern USA as a 6-second surface wave, at about half the period of the oceanic wave. This is also true of any storm off the east coast, except that the period will be different, varying from 4 to 10 seconds. Storms off the southwest coast cause a longer storm wave, but the predominant energy is still from 5 to 8 seconds. (The current (11/98) northwest coast storms are coming through St. Louis at about 5 seconds). This storm microseism noise is the major reason that the original global seismograph stations were configured as two separate instruments: a SP or short-period, peaking in gain at about 1 second, at 50k to 100k, and the LP, or long-period, peaking at 15 to 30 seconds, with magnifications from 1.5k to 6k. During a microseism storm, even the LP record could be a scribbled mess; usually the storm peak would only last for a several hours, so we wouldn't interrupt the recording. With the advent of wide dynamic range digital recording and VBB response instruments, we deal with the microseisms in later digital processing. However, for a visible monitor record on a drum recorder, we usually use a "twin-T" notch filter to reduce the microseisms by 40db (1/100). The twin-T is passive and easy to make with 3 resistors and 4 capacitors. Even with the filter, a strong storm can fill the record with noise, which is easily seen as 10 waves per minute. A historical note on tracking hurricanes before the use of satellites and aircraft: small seismograph arrays were used. At our old station FLO outside St. Louis, two additional small vaults were built 1/4 mile west and north of the main vault. THen intermediate period (10 second) seismometers were used, connected to 6-second galvanometers for photo recording with a peak response at 6-seconds. THe relative phase of the microseisms crossing the L shaped array provided a vector pointing toward the origin if the waves. It was much more accurate than 3-component particle motion analysis. With several such stations (one was at Spring Hill, AL, another at Rochester, NY) providing a pointer, the location of the hurricane could be estimated, even when hundreds of km from shore. There are some examples of the spectral noise from microseisms on my web page featuring figures and data; there is even an example of a storm peak from a hurricane last year. http://www.eas.slu.edu/People/STMorrissey/index.html Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Steve Hammond Subject: Re: OP27 OP227 Op Amp Date: Sat, 28 Nov 1998 11:01:01 -0800 Warren, I don't know if you got an answer to this question. There is a op-27 schematic on the PSN web site in San Jose http://pw2.netcom.com/~shammon1/psnsj.htm It under build your own seismograph. Regards, Steve Hammond Warren Shedrick wrote: > > Several weeks ago, someone mentioned that one of the sites on the > Seismic network contained a schematic for a high gain amplifier using > a OP27 or OP227 opamp that would be suitable for use with a > seismometer. Does anyone know where this site is? > > Thank you > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Steve Hammond Subject: Re: Northern California PSN meeting in December Date: Sat, 28 Nov 1998 11:11:41 -0800 Hi Ed, I suggested Tues 8th because that is the only night I can make it that week because of school and work. I just got off the phone with Jan and it's OK with him. Any chance you can get us a room at the USGS in Menlo Park again? Regards, Steve Edward Cranswick wrote: > > PSN- > I am writing this after my previous email that suggested Thursday and then > reading Steve Hammond's email below. > > I can also do Tuesday night. Because of the number of "indigenous PSN" members, > it may be best to use USGS Menlo Park as a compromise site, halfway between San > Francisco AGU and the South Bay. Like last year, I can have pizza delivered, and we > will all have the chance to chat and eat and maybe give helpful suggestions to > Ted&Jan about their AGU presentation on Thursday. I will be in San Francisco at AGU > and I can chauffer people from there to USGS Menlo Park in a rented car. > We need someone local to put all these schedules together. > -Edward > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? > > Ken Navarre > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > Steve Hammond wrote: > > > How is Tuesday night 8th at 7:30 sound? That's the only night that week > > I can make it. I got a note from Jan Froom and he said Pete Rowe has his > > station back on-line and would also like to attend. Where do we want to > > get togehter? > > > > Regards, Steve > > > > Larry Cochrane wrote: > > > > > > Steve and Others, > > > > > > If possible I would like to have the meeting when John Taber from New > > > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > > > 11 at 4PM. If we want to have the meeting during the day we could have it > > > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > > > ok, how about Wednesday Dec. 9? > > > > > > -Larry Cochrane > > > Redwood City, PSN > > > > > > At 08:56 PM 11/24/98 -0800, you wrote: > > > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > > > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > > > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > > > >earthquakes. > > > > > > > >Regards, Steve Hammond > > > >PSN San Jose > > > > > > > > > > > >Ken Navarre wrote: > > > >> > > > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > > > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > > >> > what we can do is have a more informal diner get together at a restaurant > > > >> > around here. We could do this sometime during the week when you, S-T > > > >> > Morrissey, Edward, and anyone else who would like too attend, will be > > > here. > > > >> > > > > >> > -Larry > > > >> > > > >> Let me know when & where and I'll try to be there. > > > >> Ken > > > > > > _____________________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email listserver@.............. with the body of the > > > message: leave PSN-L > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: 6-second microseisms Date: Sat, 28 Nov 1998 14:36:00 -0700 Sean-Thomas- Where on your website are these examples? (If you include the explicit URLs to those pages, it is easy to link to them without breaking the chain of thought, of your narrative, by being forced to dig through the digital morass.) -Edward > There are some examples of the spectral noise from microseisms on > my web page featuring figures and data; there is even an example of > a storm peak from a hurricane last year. > http://www.eas.slu.edu/People/STMorrissey/index.html -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Sat, 28 Nov 1998 14:43:39 -0700 Steve- Tuesday is good for me, and I am happy to let you coordinate the schedule (of course, you might not be so enthusiastic about that). I have started communications with USGS Menlo Park about using their office for the meeting, and I don't anticipate that will be a problem. Hope all is well. Give my regards to Olga, Michelle, and Stephanie. -Edward Steve Hammond wrote: > Hi Ed, I suggested Tues 8th because that is the only night I can make it > that week because of school and work. I just got off the phone with Jan > and it's OK with him. Any chance you can get us a room at the USGS in > Menlo Park again? > > Regards, Steve > > Edward Cranswick wrote: > > > > PSN- > > I am writing this after my previous email that suggested Thursday and then > > reading Steve Hammond's email below. > > > > I can also do Tuesday night. Because of the number of "indigenous PSN" members, > > it may be best to use USGS Menlo Park as a compromise site, halfway between San > > Francisco AGU and the South Bay. Like last year, I can have pizza delivered, and we > > will all have the chance to chat and eat and maybe give helpful suggestions to > > Ted&Jan about their AGU presentation on Thursday. I will be in San Francisco at AGU > > and I can chauffer people from there to USGS Menlo Park in a rented car. > > We need someone local to put all these schedules together. > > -Edward > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? > > > > Ken Navarre > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > Steve Hammond wrote: > > > > > How is Tuesday night 8th at 7:30 sound? That's the only night that week > > > I can make it. I got a note from Jan Froom and he said Pete Rowe has his > > > station back on-line and would also like to attend. Where do we want to > > > get togehter? > > > > > > Regards, Steve > > > > > > Larry Cochrane wrote: > > > > > > > > Steve and Others, > > > > > > > > If possible I would like to have the meeting when John Taber from New > > > > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > > > > 11 at 4PM. If we want to have the meeting during the day we could have it > > > > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > > > > ok, how about Wednesday Dec. 9? > > > > > > > > -Larry Cochrane > > > > Redwood City, PSN > > > > > > > > At 08:56 PM 11/24/98 -0800, you wrote: > > > > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > > > > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > > > > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > > > > >earthquakes. > > > > > > > > > >Regards, Steve Hammond > > > > >PSN San Jose > > > > > > > > > > > > > > >Ken Navarre wrote: > > > > >> > > > > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > > > > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > > > >> > what we can do is have a more informal diner get together at a restaurant > > > > >> > around here. We could do this sometime during the week when you, S-T > > > > >> > Morrissey, Edward, and anyone else who would like too attend, will be > > > > here. > > > > >> > > > > > >> > -Larry > > > > >> > > > > >> Let me know when & where and I'll try to be there. > > > > >> Ken > > > > > > > > _____________________________________________________________________ > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > message: leave PSN-L > > > > > > _____________________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email listserver@.............. with the body of the > > > message: leave PSN-L > > > > -- > > Edward Cranswick Tel: 303-273-8609 > > US Geological Survey, MS 966 Fax: 303-273-8600 > > PO Box 25046, Federal Center cranswick@........ > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Steve Hammond Subject: Re: Northern California PSN meeting in December Date: Sat, 28 Nov 1998 22:29:32 -0800 OK so let's speak-up... How many will attend if we have the meeting at the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? Now is the time to reply-- Edward Cranswick wrote: > > Steve- > Tuesday is good for me, and I am happy to let you coordinate the schedule (of course, > you might not be so enthusiastic about that). I have started communications with USGS > Menlo Park about using their office for the meeting, and I don't anticipate that will be > a problem. > Hope all is well. Give my regards to Olga, Michelle, and Stephanie. > -Edward > > Steve Hammond wrote: > > > Hi Ed, I suggested Tues 8th because that is the only night I can make it > > that week because of school and work. I just got off the phone with Jan > > and it's OK with him. Any chance you can get us a room at the USGS in > > Menlo Park again? > > > > Regards, Steve > > > > Edward Cranswick wrote: > > > > > > PSN- > > > I am writing this after my previous email that suggested Thursday and then > > > reading Steve Hammond's email below. > > > > > > I can also do Tuesday night. Because of the number of "indigenous PSN" members, > > > it may be best to use USGS Menlo Park as a compromise site, halfway between San > > > Francisco AGU and the South Bay. Like last year, I can have pizza delivered, and we > > > will all have the chance to chat and eat and maybe give helpful suggestions to > > > Ted&Jan about their AGU presentation on Thursday. I will be in San Francisco at AGU > > > and I can chauffer people from there to USGS Menlo Park in a rented car. > > > We need someone local to put all these schedules together. > > > -Edward > > > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? > > > > > > Ken Navarre > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > > > Steve Hammond wrote: > > > > > > > How is Tuesday night 8th at 7:30 sound? That's the only night that week > > > > I can make it. I got a note from Jan Froom and he said Pete Rowe has his > > > > station back on-line and would also like to attend. Where do we want to > > > > get togehter? > > > > > > > > Regards, Steve > > > > > > > > Larry Cochrane wrote: > > > > > > > > > > Steve and Others, > > > > > > > > > > If possible I would like to have the meeting when John Taber from New > > > > > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > > > > > 11 at 4PM. If we want to have the meeting during the day we could have it > > > > > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > > > > > ok, how about Wednesday Dec. 9? > > > > > > > > > > -Larry Cochrane > > > > > Redwood City, PSN > > > > > > > > > > At 08:56 PM 11/24/98 -0800, you wrote: > > > > > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > > > > > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > > > > > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > > > > > >earthquakes. > > > > > > > > > > > >Regards, Steve Hammond > > > > > >PSN San Jose > > > > > > > > > > > > > > > > > >Ken Navarre wrote: > > > > > >> > > > > > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > > > > > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > > > > >> > what we can do is have a more informal diner get together at a restaurant > > > > > >> > around here. We could do this sometime during the week when you, S-T > > > > > >> > Morrissey, Edward, and anyone else who would like too attend, will be > > > > > here. > > > > > >> > > > > > > >> > -Larry > > > > > >> > > > > > >> Let me know when & where and I'll try to be there. > > > > > >> Ken > > > > > > > > > > _____________________________________________________________________ > > > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > > message: leave PSN-L > > > > > > > > _____________________________________________________________________ > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > message: leave PSN-L > > > > > > -- > > > Edward Cranswick Tel: 303-273-8609 > > > US Geological Survey, MS 966 Fax: 303-273-8600 > > > PO Box 25046, Federal Center cranswick@........ > > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > > > _____________________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email listserver@.............. with the body of the > > > message: leave PSN-L > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: AMPLITUDE SIGNAL PROBLEM Date: Sat, 28 Nov 1998 23:44:10 -0700 Ian & Liz wrote: > Hi, > > Meredith, could you enlarge a bit on what "hurricane effect microseisms" > are? Thanks. > Ian, Guess S. T. Morrissey explained it all very well in his subsequent msg on "6 second microseisms", but of course with a world of more technical knowledge than I could muster. Thanks Sean-Thomas. I see alot of this microseism noise perhaps too much here during the year; and of course as his reference shows along with wind and etc. Of course theres not much I can really do about it; but too live with it. On the other hand, one could also view the variations as an interesting natural earth weather variation. Sean-Thomas's web site of: http://www.eas.slu.edu/people/STMorrissey/index.html has more info within the upper right box, titled "The STM-8 seis;recent Quakes, Data"; ...then go to 4a. "Noise Comparisons on several days in September". Interesting stuff. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Sat, 28 Nov 1998 23:59:48 -0700 Steve- I plan to chauffer any people attending AGU who also want to attend the PSN meeting on Tuesday at 7:30 PM 8 Dec at USGS Menlo Park, such as John Taber. I will be at AGU on Tuesday during the day, and pick up any PSN people at the Moscone Center and depart at 6:00 PM to drive down to USGS Menlo Park (since I will be the USGS representative, I want to be sure that I get to USGS Menlo Park to make sure everything is arranged before the other PSN members arrive for the meeting at 7:30 PM). After the meeting I will drive the AGU people back to their hotels in San Francisco. -Edward Steve Hammond wrote: > OK so let's speak-up... How many will attend if we have the meeting at > the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? > Now is the time to reply-- > > Edward Cranswick wrote: > > > > Steve- > > Tuesday is good for me, and I am happy to let you coordinate the schedule (of course, > > you might not be so enthusiastic about that). I have started communications with USGS > > Menlo Park about using their office for the meeting, and I don't anticipate that will be > > a problem. > > Hope all is well. Give my regards to Olga, Michelle, and Stephanie. > > -Edward > > > > Steve Hammond wrote: > > > > > Hi Ed, I suggested Tues 8th because that is the only night I can make it > > > that week because of school and work. I just got off the phone with Jan > > > and it's OK with him. Any chance you can get us a room at the USGS in > > > Menlo Park again? > > > > > > Regards, Steve > > > > > > Edward Cranswick wrote: > > > > > > > > PSN- > > > > I am writing this after my previous email that suggested Thursday and then > > > > reading Steve Hammond's email below. > > > > > > > > I can also do Tuesday night. Because of the number of "indigenous PSN" members, > > > > it may be best to use USGS Menlo Park as a compromise site, halfway between San > > > > Francisco AGU and the South Bay. Like last year, I can have pizza delivered, and we > > > > will all have the chance to chat and eat and maybe give helpful suggestions to > > > > Ted&Jan about their AGU presentation on Thursday. I will be in San Francisco at AGU > > > > and I can chauffer people from there to USGS Menlo Park in a rented car. > > > > We need someone local to put all these schedules together. > > > > -Edward > > > > > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? > > > > > > > > Ken Navarre > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > > > > > Steve Hammond wrote: > > > > > > > > > How is Tuesday night 8th at 7:30 sound? That's the only night that week > > > > > I can make it. I got a note from Jan Froom and he said Pete Rowe has his > > > > > station back on-line and would also like to attend. Where do we want to > > > > > get togehter? > > > > > > > > > > Regards, Steve > > > > > > > > > > Larry Cochrane wrote: > > > > > > > > > > > > Steve and Others, > > > > > > > > > > > > If possible I would like to have the meeting when John Taber from New > > > > > > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > > > > > > 11 at 4PM. If we want to have the meeting during the day we could have it > > > > > > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > > > > > > ok, how about Wednesday Dec. 9? > > > > > > > > > > > > -Larry Cochrane > > > > > > Redwood City, PSN > > > > > > > > > > > > At 08:56 PM 11/24/98 -0800, you wrote: > > > > > > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > > > > > > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > > > > > > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > > > > > > >earthquakes. > > > > > > > > > > > > > >Regards, Steve Hammond > > > > > > >PSN San Jose > > > > > > > > > > > > > > > > > > > > >Ken Navarre wrote: > > > > > > >> > > > > > > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > > > > > > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > > > > > >> > what we can do is have a more informal diner get together at a restaurant > > > > > > >> > around here. We could do this sometime during the week when you, S-T > > > > > > >> > Morrissey, Edward, and anyone else who would like too attend, will be > > > > > > here. > > > > > > >> > > > > > > > >> > -Larry > > > > > > >> > > > > > > >> Let me know when & where and I'll try to be there. > > > > > > >> Ken > > > > > > > > > > > > _____________________________________________________________________ > > > > > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > > > message: leave PSN-L > > > > > > > > > > _____________________________________________________________________ > > > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > > message: leave PSN-L > > > > > > > > -- > > > > Edward Cranswick Tel: 303-273-8609 > > > > US Geological Survey, MS 966 Fax: 303-273-8600 > > > > PO Box 25046, Federal Center cranswick@........ > > > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > > > > > _____________________________________________________________________ > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > message: leave PSN-L > > > > > > _____________________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email listserver@.............. with the body of the > > > message: leave PSN-L > > > > -- > > Edward Cranswick Tel: 303-273-8609 > > US Geological Survey, MS 966 Fax: 303-273-8600 > > PO Box 25046, Federal Center cranswick@........ > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Arie Verveer Subject: Meteor Seismic Web page Update Date: Sun, 29 Nov 1998 16:47:55 +0800 Hi, Over the months there has been some postings on fireballs and the seismic trace they have left. This may be of interest. I've been working on a project with a few people on setting up a network of "meteorite" detectors in the desert of Western Australia. In my spare time. I've just recently got the fireball detector up and running and have just added the info to my web page. Interested? http://www.iinet.net.au/~ajbv/ Also the page on the local events has been upgraded. In June 98 the station recorded some 51 events from the same area. My first swarm. I hope to put some info on the "Mercury tiltmeter / Seismometer" that I'm building. Maybe in a month or two. Arie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Meteor Seismic Web page Update Date: Sun, 29 Nov 1998 02:11:15 -0700 Arie- I checked out your plane and fireworks records and maps. Did you have a good view of the Leonids? -Edward Arie Verveer wrote: > Hi, Over the months there has been some postings on fireballs and the > seismic trace they have left. This may be of interest. > > I've been working on a project with a few people on setting up a network > of "meteorite" detectors in the desert of Western Australia. In my spare time. > I've just recently got the fireball detector up and running and have just added > the info to my web page. Interested? > > http://www.iinet.net.au/~ajbv/ > > Also the page on the local events has been upgraded. In June 98 > the station recorded some 51 events from the same area. My first > swarm. > > I hope to put some info on the "Mercury tiltmeter / Seismometer" > that I'm building. Maybe in a month or two. > > Arie > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Arie Verveer Subject: Re: Meteor Seismic Web page Update Date: Sun, 29 Nov 1998 19:24:40 +0800 Hi Ed You wouldn't believe it, We had thunder and lightning all night, it hadn't been so bad in years. Them's the breaks. The next good meteor shower is on the 13 dec (Geminids) that will be a good test for the detector. All the Best Arie Edward Cranswick wrote: > I checked out your plane and fireworks records and maps. Did you have a good > view of the Leonids? > -Edward _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Liberio Rossi" Subject: Quake in progress Date: Sun, 29 Nov 1998 16:08:54 +0100 I am recording a big quake. Here the data Lat.43.922 Long 10.532 Regards _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Marchal van Lare Subject: Re: Quake in progress Date: Sun, 29 Nov 1998 10:15:00 -0500 Hi all, Recording a big quake too. Marchal van Lare = Nieuwvliet, The Netherlands= _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: peaches@............ (Donna Whitaker) Subject: Re: Quake in progress Date: Sun, 29 Nov 1998 05:37:28 -1000 (HST) Hi everybody. Found this on the tsunami alert. AN EARTHQUAKE, PRELIMINARY MAGNITUDE 7.6, OCCURRED AT 0511 AST ON NOV 29, OR 0611 PST ON NOV 29, OR 1411 UTC ON NOV 29. THE EARTHQUAKE WAS LOCATED IN THE GENERAL AREA OF: CELEBES IS. NEAR 1.3S, 124.0E. Recording big waves here in Hawaii. Tony >Hi all, > >Recording a big quake too. > >Marchal van Lare >Nieuwvliet, The Netherlands >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Norman Davis WB6SHI Subject: Re: Northern California PSN meeting in December Date: Sun, 29 Nov 1998 07:49:32 At 10:29 PM 11/28/98 -0800, you wrote: >OK so let's speak-up... How many will attend if we have the meeting at >the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? >Now is the time to reply-- Well it is in the middle of the work week for me and I know others that could make it. It would be to far to drive over and back that same night. Norm Shingle springs, CA Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Norman Davis WB6SHI Subject: neat link Date: Sun, 29 Nov 1998 07:44:28 http://www.iinet.net.au/~ajbv/ meteors and seismology. I love it! Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: George Bush Subject: Quake in progress Date: Sun, 29 Nov 1998 08:06:41 -0800 The quake is over an hour old and is still easily apparent over the storm noise here in N California 100 mi. up the coast from San Francisco. And I thought that living within 200 yards of the ocean in the middle of a storm with sea swells, I wouldn't be able to see anything. Awesome! George _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Francesco" Subject: BIG QUAKE Date: Sun, 29 Nov 1998 17:15:07 +0100 FROM ALL ITALIAN STATIONS Origin time: 14:10:32 ---- 1.9S 125.0E --- MS=3D ~7.2 =20 MOLUCCA SEA =20 I.E.S.N. PSN ITALY Francesco Nucera

FROM ALL ITALIAN = STATIONS
 
Origin time:  14:10:32  = ----=20 1.9S   125.0E ---   MS=3D ~7.2 
MOLUCCA SEA    =20
 
I.E.S.N.   PSN = ITALY
Francesco = Nucera
From: Ian & Liz Subject: Re: Quake in progress Date: Sun, 29 Nov 1998 07:30:41 -1000 Hi, what's the web address for the tsunami alert page? Thanks Ian Smith _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: jcblaine@........... Subject: URL's - Tsunami Warning Centers Date: Sun, 29 Nov 1998 09:43:48 -0800 Latest ATWC (Alaska Tsunami Warning Center) Tsunami Report http://www.alaska.net/~atwc/message.txt Latest PTWC (Pacific Tsunami Warning Center) Tsunami Report http://iwin.nws.noaa.gov/pub/data/text/wepa40/PHEB.TXT Ian & Liz wrote: > Hi, > > what's the web address for the tsunami alert page? > > Thanks > > Ian Smith > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: Northern California PSN meeting in December Date: Sun, 29 Nov 1998 14:08:04 -0800 Tuesday works for me.... -Larry At 10:29 PM 11/28/98 -0800, you wrote: >OK so let's speak-up... How many will attend if we have the meeting at >the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? >Now is the time to reply-- > > >Edward Cranswick wrote: >> >> Steve- >> Tuesday is good for me, and I am happy to let you coordinate the schedule (of course, >> you might not be so enthusiastic about that). I have started communications with USGS >> Menlo Park about using their office for the meeting, and I don't anticipate that will be >> a problem. >> Hope all is well. Give my regards to Olga, Michelle, and Stephanie. >> -Edward >> >> Steve Hammond wrote: >> >> > Hi Ed, I suggested Tues 8th because that is the only night I can make it >> > that week because of school and work. I just got off the phone with Jan >> > and it's OK with him. Any chance you can get us a room at the USGS in >> > Menlo Park again? >> > >> > Regards, Steve >> > >> > Edward Cranswick wrote: _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ken Navarre Subject: Re: Northern California PSN meeting in December Date: Sun, 29 Nov 1998 14:49:34 -0800 (PST) > OK so let's speak-up... How many will attend if we have the meeting at > the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? > Now is the time to reply-- I'll be there... Ken Navarre _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Brett Nordgren Subject: Seismo loop analysis Date: Sun, 29 Nov 1998 19:53:35 -0500 To all: Just finished a major update of the STM-8 loop analysis. New filename "loop3.pdf" Eliminated analysis of position and acceleration response -- now velocity only. Greatly expanded detail in math section, added graph of asymptotes plus some feedback design considerations for any force-feedback seismo. Related files: "feedback.pdf", "complex.pdf" Available for download at: http://members.home.net/nordgren/public/ Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Steve Hammond Subject: Re: Northern California PSN meeting in December Date: Sun, 29 Nov 1998 18:57:56 -0800 Hi Norm, Sorry of the middle of the week date but the Sat date I first suggested crashed a few posts back... I'll make a point to bring this up and suggest that the next meeting be on a Sat around noon. Regards, Steve Hammond San Jose PSN Norman Davis WB6SHI wrote: > > At 10:29 PM 11/28/98 -0800, you wrote: > >OK so let's speak-up... How many will attend if we have the meeting at > >the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? > >Now is the time to reply-- > > Well it is in the middle of the work week for me and I know others that > could make it. It would be to far to drive over and back that same night. > > Norm > Shingle springs, CA > > Norman Davis WB6SHI > Shingle Springs, Ca > normd@............. > http://www.directcon.net/normd/index.htm > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: 1998 Public Seismic Network meeting at USGS, Menlo Park Date: Mon, 30 Nov 1998 16:10:15 -0700 Kristine- Thank you very much for arranging for the PSN to use the Conference Room 8111 at USGS Menlo Park on December 8 from 7:30-9:00 PM. Do you know if there are any Western Region USGS websites that have a map and directions about how to get to Building 8, 345 Middlefield Road, Menlo Park (something like this may have been prepared for a recent USGS Open House)? -Edward > Subject: > Re: 1998 Public Seismic Network meeting at USGS, Menlo Park > Date: > Mon, 30 Nov 1998 13:01:24 -0800 > From: > Kristine Estrada > To: > cranswick@........ > Kristine Estrada wrote: > Edward, > I made your reservation in Conference Room 8111 for December 8 from 7:30-9 > p.m. I am also sending this to Frank Ribeiro, Security Manager. There are > plenty of chairs. > Kristine > > Edward Cranswick wrote: > > > Kristine- > > I don't anticipate more than about 10 people, and now it appears the > > meeting will be at 7:30 PM on Tuesday, 8 Dec. Since I am familiar with > > Buildings 7 & 8 (or rather, I was when I worked there, 1980-1985), and > > because we had last year's PSN meeting there, I thought that the > > Building 8 Conference room (1st Floor) would be the best location for > > this year's meeting. There used to be a large table in the back of the > > Building 8 Conference room which had corkboard on the wall, and this > > would be perfect for our purposes. > > Please let me know if this can be arranged. Thank you for your help. > > > > -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: wizard@......... (Rick Jerome) Subject: Re: 1998 Public Seismic Network meeting at USGS, Menlo Park Date: Mon, 30 Nov 1998 17:42:00 -0800 Wish I could make it to the meeting. The logistics are just too much for that time of the night. Live 3 Hours away near Sonora. Have to work the next day. Keep up the good work! Enjoy all of your postings. > 8111 at USGS Menlo Park on December 8 from 7:30-9:00 PM. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: RESINE questions (Followup) Date: Mon, 30 Nov 1998 21:33:41 -0700 Hi all, Am presenting the questions and notes as a followup, to the Resine conference and beginning network of schools in Portugal. Although it is over, I think it is important to follow through on the questions and answers, as they have already made alot of amazing strides toward organizing their network, and obviously deserve support. I'am guessing, but I suspect Mr. Luis Torres is resting from the organizational ordeal which has gone on probably for quite some time. Sometimes in life the best incentive toward a goal is found in simple communication. I've answered questions 2 thru 6, as best as I could. However of course, if you wish to make addeniums, or corrections, feel free to do so. Meredith Lamb > > From Luis.Torres@...... Fri Nov 27 12:12 MST 1998 > > > > Questions were: 1) How to seismologists know about depth. In plan view > > we understand it, intersections of at least 3 circles from the S-P > > difference, but depth?. John Lahr said; > I'll take a stab at this. Consider three stations located 6 km apart at the points of an equilateral triangle. An earthquake 8 km deep occurs beneath one of the stations. The total distance to that stations will be 8 km, but the distance to the other two stations will be sqrt(8*8 + 6*6) = 10 km. The s-p intervals would be approximately 8/8 = 1 s at the closest station and 10/8 = 1.25 s at the other two. To find the location of the earthquake given just the s-p intervals of 1, 1.25, and 1.25 one would have to consider not circles on a map but bowls with radii of 8, 10, and 10 km centered beneath the stations. In the late 1960's when some earthquakes were still being located graphically, the technique was to try various trial depths. For each trial depth, the circles could be drawn. If they did non meet in a point, or a very small region, then a higher or lower depth was used. In the example give above, if the trial depth was 4 km, then the radii would have been sqrt(8*8 - 4*4) = 6.9 km and sqrt(10*10 - 4*4) = 9.2 km. These three circles would overlap too much, so a deeper depth would be used for the next trial. Today computer programs are used to find the epicenter, depth, and origin time, using the method of iterative least squares first described by Geiger (Bull. St. Louis Univ. 8, 60-71) in 1912. Hope this helps, JCLahr > > > 2) SDR- how do you set up thresholds to avoid getting noise and separate > > it from the events. two schools compaliend they could not get the > > thresholds in SDR to work Electronic and seismic microseisms and man made noise are a part of all seismograph stations. Alot of electronic noise can be reduced by the use of shielded wire, and metal boxes for housing the pre-amplifiers leading to the computer and its SDR programs. The man made noise would be reduced by housing the seismometer as far away from this as possible. As far as the SDR program itself; a careful review of the literature may reveil an answer. Without more specifics on the setups at the 2 involved schools, it is hard to really assist via email. Perhaps a review of the 4 successfully set up computers/SDR's by a person there, and applied to the 2 with trouble, the answer could be resolved? As I understand it now; the seismometers themselves are not built yet, and I presume that a hand held coil and magnet were used in the pre-amplifier and SDR testing? M. Lamb > 3) Is there a school networks in the US and is it affiliated to PSN? I know of none at this time. However, several members in California have been active in school equipment and assistance efforts in that respective area. Mr. John Lahr of the USGS, while up in Alaska did alot of extensive work involving schools. Mr. David Nelson in New Zealand has done extensive work with schools there. Actually there are alot of individuals who have participated in conjunction with these efforts and the list would be long with specific names. M. Lamb 4) Orientation of the Lehaman. People asked if E-W for example was for the direction of > oscilation or for the axis of the boom. Direction of oscillation. I.e.; if the boom points E-W, the sensing direction is N-S. M. Lamb > 5) What have amateur people learned by monitoring earthquakes like we are trying to > do. Is this not an advanced subject for common people like teachers and K-10, K-12 > students, as the records seem so complex? It is not so important to understand all the possible records with the different wave forms; as it is to be exposed to the idea of earthquake awareness especially in the area of Portugal, which has had large damaging shocks in the past, and too instill more consideration via education for future generations who live there. With time and more exposure to all the number of subjects involved which cover a number of fields, one will pick up a variety of new and helpful items which can broaden their education. M. Lamb > 6) Using several components. Does it give so much more info?. The expert commented > that for one component usually it is the vertical component hat is monitored, while with > ours we were getting an horizontal one. It would not matter much if they were E-W or > N-S. Three components will show more of a complete picture of ground motion at any one site. Two horizontals at one site, often will show fair to large differences in amplitude per a given quake. If the quake is west of Portugal; one could expect a larger amplitude on the E-W, than on the N-S, as a very general rule; but it is not always the case. This can often give a picture of direction of a given quake from the recording site. A vertical seismometer is indeed usually the preferred instrument; but at the moment there are no simple plans on a par with the horizontal that you are going to use. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: RESINE questions (Followup) Date: Mon, 30 Nov 1998 22:23:49 -0700 Meredith- I applaud your good sense in completing the exercise with RESINE and your intelligent and useful answers to the questions. -Edward meredith lamb wrote: > Hi all, > > Am presenting the questions and notes as a followup, to the Resine > conference and beginning network of schools in Portugal. Although > it is over, I think it is important to follow through on the questions > and answers, as they have already made alot of amazing strides toward > organizing their network, and obviously deserve support. I'am > guessing, but I suspect Mr. Luis Torres is resting from the organizational > ordeal which has gone on probably for quite some time. Sometimes in > life the best incentive toward a goal is found in simple communication. > > I've answered questions 2 thru 6, as best as I could. However of > course, if you wish to make addeniums, or corrections, feel free to > do so. > > Meredith Lamb > > > > From Luis.Torres@...... Fri Nov 27 12:12 MST 1998 > > > > > > Questions were: 1) How to seismologists know about depth. In plan view > > > we understand it, intersections of at least 3 circles from the S-P > > > difference, but depth?. > > John Lahr said; > > > I'll take a stab at this. > > Consider three stations located 6 km apart at the points of > an equilateral triangle. An earthquake 8 km deep occurs beneath > one of the stations. The total distance to that stations will > be 8 km, but the distance to the other two stations will be > sqrt(8*8 + 6*6) = 10 km. The s-p intervals would be approximately > 8/8 = 1 s at the closest station and 10/8 = 1.25 s at the other > two. > > To find the location of the earthquake given just the s-p intervals > of 1, 1.25, and 1.25 one would have to consider not circles on a map > but bowls with radii of 8, 10, and 10 km centered beneath the > stations. > > In the late 1960's when some earthquakes were still > being located graphically, the technique was to try various trial > depths. For each trial depth, the circles could be drawn. If they > did non meet in a point, or a very small region, then a higher or > lower depth was used. > > In the example give above, if the trial depth was 4 km, then > the radii would have been sqrt(8*8 - 4*4) = 6.9 km and > sqrt(10*10 - 4*4) = 9.2 km. These three circles would overlap > too much, so a deeper depth would be used for the next trial. > > Today computer programs are used to find the epicenter, > depth, and origin time, using the method of iterative least squares > first described by Geiger (Bull. St. Louis Univ. 8, 60-71) in 1912. > > Hope this helps, > JCLahr > > > > > > 2) SDR- how do you set up thresholds to avoid getting noise and separate > > > it from the events. two schools compaliend they could not get the > > > thresholds in SDR to work > > Electronic and seismic microseisms and man made noise are a part of all > seismograph > stations. Alot of electronic noise can be reduced by the use of shielded > wire, and metal > boxes for housing the pre-amplifiers leading to the computer and its SDR > programs. The > man made noise would be reduced by housing the seismometer as far away from > this as > possible. As far as the SDR program itself; a careful review of the > literature may reveil > an answer. Without more specifics on the setups at the 2 involved schools, it > is hard to > really assist via email. Perhaps a review of the 4 successfully set up > computers/SDR's by > a person there, and applied to the 2 with trouble, the answer could be > resolved? As I > understand it now; the seismometers themselves are not built yet, and I > presume that a > hand held coil and magnet were used in the pre-amplifier and SDR testing? M. > Lamb > > > 3) Is there a school networks in the US and is it affiliated to PSN? > > I know of none at this time. However, several members in California have been > active > in school equipment and assistance efforts in that respective area. Mr. John > Lahr of > the USGS, while up in Alaska did alot of extensive work involving schools. > Mr. David > Nelson in New Zealand has done extensive work with schools there. Actually > there > are alot of individuals who have participated in conjunction with these > efforts and the > list would be long with specific names. M. Lamb > > 4) Orientation of the Lehaman. People asked if E-W for example was for the > direction of > > oscilation or for the axis of the boom. > > Direction of oscillation. I.e.; if the boom points E-W, the sensing direction > is > N-S. M. Lamb > > > 5) What have amateur people learned by monitoring earthquakes like we are > trying to > > do. Is this not an advanced subject for common people like teachers and > K-10, K-12 > > students, as the records seem so complex? > > It is not so important to understand all the possible records with the > different wave > forms; as it is to be exposed to the idea of earthquake awareness especially > in the > area of Portugal, which has had large damaging shocks in the past, and too > instill more > consideration via education for future generations who live there. With time > and more > exposure to all the number of subjects involved which cover a number of > fields, one > will pick up a variety of new and helpful items which can broaden their > education. > M. Lamb > > > 6) Using several components. Does it give so much more info?. The expert > commented > > that for one component usually it is the vertical component hat is > monitored, while with > > ours we were getting an horizontal one. It would not matter much if they > were E-W or > > N-S. > > Three components will show more of a complete picture of ground motion at any > one > site. Two horizontals at one site, often will show fair to large differences > in amplitude > per a given quake. If the quake is west of Portugal; one could expect a > larger amplitude > on the E-W, than on the N-S, as a very general rule; but it is not always the > case. This > can often give a picture of direction of a given quake from the recording > site. A vertical > seismometer is indeed usually the preferred instrument; but at the moment > there are no > simple plans on a par with the horizontal that you are going to use. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Re: Apparently a no go with Resine connecgtion Date: Mon, 30 Nov 1998 23:37:40 -0800 At 07:12 PM 11/27/98 +0000, torres@...... wrote: >Questions were: 1) How to seismologists know about depth. In plan view >we understand it, intersections of at least 3 circles from the S-P >difference, but depth?. >2) SDR- how do you set up thresholds to avoid getting noise and separate >it from the events. two schools compaliend they could not get the >thresholds in SDR to work Luis -- I'll add my two cents worth for number 2: Reliable automatic detection of events in the presence of noise is at best problematic. And there are signal levels below which you might as well give up at automatic detection, at least without very sophisticated software. SDR's detection triggers when the signal exceeds a specified threshold for a specified number of counts. I've found this to work well for a number of events that I pick up. However, comparing my record from SDR with a published list of events for the same time period (such as from USGS in the USA) yields perhaps a 10:1 increase in the number of identifiable events. Of course this is hindsight but, even so, the human eye/brain is pretty good at pattern recognition and separating signals from noise. As an example, my system running SDR will save an average of five event files per day. Of these, about one in two days is an actual earthquake. The rest are usually my two sons working on their trucks. Lehman-type seismometers are very sensitive to tilt, and a cat walking on the concrete slab near my instrument will account for an event every five days or so. In the winter, I have to increase the trigger thresholds in SDR to avoid false triggering on storm-induced microseisms. This level varies about 4:1 from its quietist to the noisiest. Much effort has been spent on phase-detection software that will detect various phases out of a seismometer record, but I don't know of any that will interface with the SDR / Winquake file format. Another approach to the problem is to reduce background noise such that detection thresholds can be lowered to trigger on weaker events. As Sean-Thomas has recently mentioned on the PSN list, storm-caused microseisms are a large source of noise that can be mostly filtered out since they are of fairly limited bandwidth. Local noise from people passing by can often by reduced by locating the instrument away from areas of foot traffic (such as on a separate isolated concrete slab), but things like nearby trucks and trains can be more trouble unless you have the option of moving the instrument far away from these sources. Wind blowing in nearby trees is another source of noise, as well as temperature variations in the instrumentation. Best of luck with your projects, and please ask more questions. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Tue, 01 Dec 1998 03:02:23 -0700 John- Will you be able to attend the PSN meeting at USGS Menlo Park on Tuesday, 8 Dec at 7:30 PM? I will pick up any AGU people at the Moscone Center at 6:00 PM who are attending and drive us to Menlo Park for the PSN meeting (where dinner will be served in the form of pizza) and then return people to their hotels in San Francisco afterwards. Hope to see you. -Edward John Taber wrote: > Larry, > > What is the best evening for you? Would you be willing to > come up into the city? I think you should just choose a time and > place and then let people know. > > It's probably simpler if we don't try inviting PEPP & IRIS > people, because as Edward says, it would shift the focus. It > was just a thought if no one other than you, me and > Edward were going to be able make it, but fortunately it looks > like some others will be able to come. I'd > just like to finally meet you and thank you for for all the work > you have done. > > John > > Larry wrote: > >Not sure how we will workout all of the details, but it sounds good... > > Edward Wrote: > >I think that that is a good idea to invite some IRIS & PEPP people, although > >originally I thought it was just going to be family, PSN. So now we have to > >think about setting a date and a place and how to contact these > >others. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Tue, 01 Dec 1998 03:02:23 -0700 John- Will you be able to attend the PSN meeting at USGS Menlo Park on Tuesday, 8 Dec at 7:30 PM? I will pick up any AGU people at the Moscone Center at 6:00 PM who are attending and drive us to Menlo Park for the PSN meeting (where dinner will be served in the form of pizza) and then return people to their hotels in San Francisco afterwards. Hope to see you. -Edward John Taber wrote: > Larry, > > What is the best evening for you? Would you be willing to > come up into the city? I think you should just choose a time and > place and then let people know. > > It's probably simpler if we don't try inviting PEPP & IRIS > people, because as Edward says, it would shift the focus. It > was just a thought if no one other than you, me and > Edward were going to be able make it, but fortunately it looks > like some others will be able to come. I'd > just like to finally meet you and thank you for for all the work > you have done. > > John > > Larry wrote: > >Not sure how we will workout all of the details, but it sounds good... > > Edward Wrote: > >I think that that is a good idea to invite some IRIS & PEPP people, although > >originally I thought it was just going to be family, PSN. So now we have to > >think about setting a date and a place and how to contact these > >others. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Hernlund Subject: Re: RESINE questions (Followup) Date: Tue, 01 Dec 1998 08:54:00 -0700 (MST) > > Hi all, > > Am presenting the questions and notes as a followup, to the Resine > > conference and beginning network of schools in Portugal. Although > > it is over, I think it is important to follow through on the questions > > and answers, as they have already made alot of amazing strides toward > > organizing their network, and obviously deserve support. I'am > > guessing, but I suspect Mr. Luis Torres is resting from the organizational > > ordeal which has gone on probably for quite some time. Sometimes in > > life the best incentive toward a goal is found in simple communication. > > I've answered questions 2 thru 6, as best as I could. However of > > course, if you wish to make addeniums, or corrections, feel free to > > do so. > > Meredith Lamb > > > > From Luis.Torres@...... Fri Nov 27 12:12 MST 1998 > > > > Questions were: 1) How to seismologists know about depth. In plan view > > > > we understand it, intersections of at least 3 circles from the S-P > > > > difference, but depth?. > > John Lahr said; > > > I'll take a stab at this. > > Consider three stations located 6 km apart at the points of > > an equilateral triangle. An earthquake 8 km deep occurs beneath > > one of the stations. The total distance to that stations will > > be 8 km, but the distance to the other two stations will be > > sqrt(8*8 + 6*6) = 10 km. The s-p intervals would be approximately > > 8/8 = 1 s at the closest station and 10/8 = 1.25 s at the other > > two. > > To find the location of the earthquake given just the s-p intervals > > of 1, 1.25, and 1.25 one would have to consider not circles on a map > > but bowls with radii of 8, 10, and 10 km centered beneath the > > stations. > > In the late 1960's when some earthquakes were still > > being located graphically, the technique was to try various trial > > depths. For each trial depth, the circles could be drawn. If they > > did non meet in a point, or a very small region, then a higher or > > lower depth was used. > > In the example give above, if the trial depth was 4 km, then > > the radii would have been sqrt(8*8 - 4*4) = 6.9 km and > > sqrt(10*10 - 4*4) = 9.2 km. These three circles would overlap > > too much, so a deeper depth would be used for the next trial. > > Today computer programs are used to find the epicenter, > > depth, and origin time, using the method of iterative least squares > > first described by Geiger (Bull. St. Louis Univ. 8, 60-71) in 1912. > > Hope this helps, > > JCLahr I'd like to add just a few comments to this. If an earthquake occurs at a certain depth, there is a good way to get an idea of the depth by tracking the first waves that will arrive. The first wave will be a P wave which travels directly to the receiver. However another wave that can be identified for larger events is one which travels up to the surface, and reflects back down and then travels to the receiver. This is called the pP arrival. By measuring the time difference between P and pP and finding the epicentral distance you can determine the depth. Similarly, S-waves will do the same, and are called S and sS. In general, the depth locations reported by the NEIC have quite a lot of error in locations. Detailed studies using records for earthquakes which examine the above types of arrivals (termed "depth phases") can help to reduce this error. This is called "relocation." This process generally involves making adjustments for changes in the velocities in the crust where the quake occurs, however computers have made this process much faster. There is a big difference between normal catalog locations and relocated events. For example, data from the Pamir-Hindu Kush region (Afghanistan, Pakistan, Tibet, former South Soviet Union, etc.) was relocated (See Pegler and Das, J. Geophys. Int., 1998) and examined in an attempt to better resolve the deep structures there that are producing earthquakes. The difference is very striking, however their study does not clear up the debate about how where the structure came from and where it is going. >>> 3) Is there a school networks in the US and is it affiliated to PSN? >> >> I know of none at this time. However, several members in California have >> been active in school equipment and assistance efforts in that respective >> area. Mr. John Lahr of the USGS, while up in Alaska did alot of extensive >> work involving schools. Mr. David Nelson in New Zealand has done extensive >> work with schools there. Actually there are alot of individuals who have >> participated in conjunction with these efforts and the list would be long >> with specific names. M. Lamb There is a small network that was getting a slow start, but which was funded by universities in a program called PEPP (Princeton Earth Physics Project). I know the high school here in Tempe, AZ was supposed to get a seismometer from them but apparently the instruments were damaged in shipping. I do not know if they have gotten that off the ground yet... >>> 5) What have amateur people learned by monitoring earthquakes like we are >>> trying to do. Is this not an advanced subject for common people like >>> teachers and K-10, K-12 students, as the records seem so complex? Seismology appears to be quite complex on the surface, and most of the classic books will look like hieroglyphs to people not familiar with advanced mathematics. But understanding seismology does not require a mathematical background! Many people come to understand seismograms and seismometer mechanics without ever studying the mathematical equations which govern them. The best way to do it is to play around with some of your own. For example, examine what happens when the damping of the instrument is changed. No experienced seismologist knows what every little wiggle on a seismogram means, so don't be frustrated by not understanding everything you see. Just start off with the basics, by identifying the P, S, and surface waves and then move on from there. It takes a lot of practice to read these well, and anyone will say that it is a difficult skill to master... You will also see a lot of very interesting diagrams and well identified wave arrivals representing discontinuities or other points in the Earth that look beautiful, and you may ask yourself: "why don't my records look like that?" Probably the biggest reason is that published figures and arrivals from weak reflecting layers in the Earth are usually made by "stacking" many records together and doing a lot of filtering. Stacking is done because an arrival may be so weak that you will never see it well on one seismogram, so you have to add many seismograms together until you can see it clearly. A good book to read that will cover a lot of the basic information without a lot of math is called "Inside the Earth" by Bruce Bolt. I highly recommend this for anyone who wants a fairly thorough but basic introduction to seismology. There is also a lot of interesting history... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Hernlund Subject: Re: Apparently a no go with Resine connecgtion Date: Tue, 01 Dec 1998 09:20:03 -0700 (MST) On Mon, 30 Nov 1998, Karl Cunningham wrote: > At 07:12 PM 11/27/98 +0000, torres@...... wrote: > >2) SDR- how do you set up thresholds to avoid getting noise and separate > >it from the events. two schools compaliend they could not get the > >thresholds in SDR to work > Luis -- > I'll add my two cents worth for number 2: > Much effort has been spent on phase-detection software that will detect > various phases out of a seismometer record, but I don't know of any that > will interface with the SDR / Winquake file format. There is a basic way to handle this with a little programming skill. SDR saves event files based on the amplitude of the signal, but the best way to find actual arrivals is to do the following: Take the record of data points, and using the sampling rate find the time difference between every data point. If the sampling rate is "R" then the time between points is simply T=1/R. Define a large time window of several minutes (adjust as needed) and for each point "A" in this window multiply it by "T." Then add all of them together and divide this by the time length of the window. This is a rough type of integration. Then defined a small window, like 10 seconds and place it at the far right end of the large window and do the same procedure for every point in here. Now you can use the ratio of the value in the small window to the value in the large window to decide if there is an arrival or not. For normal activity the ratio of the values in the small window "S" to the values in the large window "L" will be: S/L = 1 By adjusting the length of your windows to your instrument and background noise you can find a fairly reasonable value of S/L that will signal an arrival. Move both windows ahead one data point and compute the values of S/L. Then you can plot the values of S/L for each time and you will see a distinct rise for an arrival. This works better for lower frequencies than higher ones. If you are interested in exploring this technique further, you can multiply every event in the windows by certain functions (called wavelets) to get an even better defined ratio. This latter technique is fairly new, and springs from a new mathematical technique called the wavelet transform... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: taber@............. (John Taber) Subject: Re: Northern California PSN meeting in December Date: Wed, 2 Dec 1998 10:30:18 +1300 Edward, Thanks for offering to provide a shuttle service from AGU! I'll be at the Moscone Center at 6:00. Cheers, John _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Northern California PSN meeting in December Date: Tue, 01 Dec 1998 22:04:26 -0700 John- If you need to contact me about the PSN meeting or the ride there, I will be staying at the San Francisco Hilton & Towers (415-771-1400) from Saturday (5 Dec) through at least Wednesday morning (9 Dec). See you on Tuesday, if not before. -Edward John Taber wrote: > Edward, > > Thanks for offering to provide a shuttle service from AGU! > I'll be at the Moscone Center at 6:00. > > Cheers, > > John > > John- > Will you be able to attend the PSN meeting at USGS Menlo Park on Tuesday, 8 > Dec at 7:30 PM? I will pick up any AGU people at the Moscone Center at 6:00 PM > who are attending and drive us to Menlo Park for the PSN meeting (where dinner > will be served in the form of pizza) and then return people to their hotels in > San Francisco afterwards. > Hope to see you. > -Edward > -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: Meteor Seismic Web page Update Date: Wed, 02 Dec 1998 10:57:13 -0700 Arie Verveer wrote: > Hi, Over the months there has been some postings on fireballs and the > seismic trace they have left. This may be of interest. > I've been working on a project with a few people on setting up a network > of "meteorite" detectors in the desert of Western Australia. In my spare time. > I've just recently got the fireball detector up and running and have just added > the info to my web page. Interested? Arie, are all the images from other active detectors? Does National Geographic make the units or are they constructed from plans, or is it up to the individual station to construct? How many are planned and over what amount of territory; say, in and around Perth? Are you planning more for operation and care by yourself? Am presuming that the ultimate goal is using the data/picture to help locate a potential ground meteorite. Do you help with the past ground searches of the past/future? Any potential for a web photo of found meteorites of the past/future? Somehow the detector looks somehow alien.....somewhat like my S-G's ha. So.......NATURALLY.....I like the design-ha. > > > http://www.iinet.net.au/~ajbv/ > > Also the page on the local events has been upgraded. In June 98 > the station recorded some 51 events from the same area. My first > swarm. > > I hope to put some info on the "Mercury tiltmeter / Seismometer" > that I'm building. Maybe in a month or two. > > Arie > I'll be looking forward to seeing the tiltmeter on the web. If its successful, I think it will be a first amateur unit on a continuious basis (?). Have tried my S-G's with their Hall sensor units, but the gain seemed to be too much at the time, and rapidly went offscale over the course of time...but the potential is still there I think. Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: mercury tiltmeters Date: Wed, 2 Dec 1998 13:42:16 -0600 (CST) Arie, I have no idea what configuration your tiltmeter/seismometer has. And although you are probably aware of it, I must point out that there is a serious health hazard from liquid mercury in that it is always evaporating at room temperatures. One can see the vapors by shining a polarized collimnated light over a dish of Hg onto a screen or wall. For this reason, moving fluid tiltmeters have been made with conductive electrolytes and resistive bridge circuits, like the Autonetics/Rockwell/ Kinemetrics biaxial unit, or the Geomechanics unit that uses the Frederics bubble. For use as horizontal seismometers, these sensors have about a 1 second mechanical response, so the displacement output is flat from there to DC, so a differentiator readily turns them into a velocity sensitive seismometer with a 1/omega response. I still have the hardware and the kilograms of Hg for a long baseline (50 meter) mercury tiltmeters from the late 60's that we tried to install deep in a lead mine for temperature stability. The long tube ( flexible nylon tubing) of mercury was used as the "center plate" of a differential capacitance tiltmeter, where the acrylic end reservoirs had the reference capacitor disk or plate fastened from the lid, and was screwed down to within 0.5 mm of the surface of the mercury. To contain the vapors, we had an additional tube connecting the air spaces of the three reservoirs, and additionally we poured silicon oil over the mercury pool (as such it was the dielectric of the capacitors). We had to remove the instruments when the lead ran out and the mine was abandoned and flooded. Current long-baseline fluid tiltmeters use either very sensitive differential pressure transducers at the center, or interferometers at the ends. The longest I am aware of are 750 meters long, and do well to document all the instability of the end monuments caused by rainfall, temperature, etc. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Re: New event files: Mc2.4 9mi NW of Oceanside, CA Date: Wed, 02 Dec 1998 17:09:55 -0800 Hi all -- Yesterday an event occured that had an unusual-looking waveform -- the P wave is significantly larger than the S. Looking at the waveforms for this event at http://www-socal.wr.usgs.gov/given/review/quakes/9072736_sum.html they show a similar characteristic. The event is: 98/12/01 20:47:40 33.27N 117.49W 6.0 2.5ML C 9 mi. NW of Oceanside, CA My acceleration and velocity waveforms (respectively) are at: ftp://psn.quake.net/quakes/9812/981201a.kc2 ftp://psn.quake.net/quakes/9812/981201a.kc1 Could someone give an explaination of what's going on? Thanks, Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Arie Verveer Subject: Re: Meteor Seismic Web page Update Date: Thu, 03 Dec 1998 19:35:58 +0800 Hi Meredith > > are all the images from other active detectors? Does National > Geographic make the units or are they constructed from plans, or is it > up to the individual station to construct? How many are planned and > over what amount of territory; say, in and around Perth? Are you > planning more for operation and care by yourself? The one featured in the web page is a prototype that I constructed to test the device. I hope to publish the electronic and mechanical schematics when we announce the device in our first paper. The next good window of opportunity to test the device is on Dec 13th, so if all goes well we should have a paper out in the first quarter of next year and a web page with all (all) the info. Initially we plan three detectors spaced around 100 - 150 km apart in the desert region way east of my location, but the prototype will remain on my roof. Much to the amusement of my neighbours. It sits on top of my disused chimney. > Am presuming that the ultimate goal is using the data/picture to help locate a potential > ground meteorite. That's the real goal, a meteorite that's still smoking !!! > Do you help with the past ground searches of the > past/future? I never actually been on a expedition but been invited to go on two of them. It was difficult to get leave from work. Anyhow, all you do is walk around and look for unusual rocks and drink beer at night around the campfire. Sounds like heaven. > Any potential for a web photo of found meteorites of the past/future? That's a great suggestion, Ill have a word with the others and see what can be done. Thanks. > Somehow the detector looks somehow alien.....somewhat like my S-G's. We call it the "Jupiter 2" , remember the navigation dome in the TV series of "Lost in Space". !! > I'll be looking forward to seeing the tiltmeter on the web. I purchased all the raw materials and plan to start machining just after Christmas. It shouldn't take to long to make. > Have tried my S-G's with their Hall sensor units, but the > gain seemed to be too much at the time. I hope you will continue with this experiment, sounds real interesting. All the best and thanks for the suggestion about a meteorite photo. Arie _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Arie Verveer Subject: Re: mercury tiltmeters Date: Thu, 03 Dec 1998 20:27:55 +0800 Hi Sean-Thomas Thanks for the info and the warning about health hazards of liquid mercury. That's one of my major concerns. But I plan to make a sealed system with proper ventilation when its being filled. Some 20+ years ago I worked on a "Meridian Telescope" that used a bath of liquid mercury as a horizon. This surface was exposed to our working environment, madness. Your idea of having silicon oil acting as the dielectric is real interesting. It should also keep the vapours down. Great idea. Initially I was planning a long base length but I couldn't get any commitment on the site, so now I'm planning to construct one with a base length of 6 feet and a cup diameter of 3.2 inches with a connecting tube of 0.154 inches in diameter. It should have a period around 39 seconds and a dampening factor of 0.76 The cups will be made out of acrylic with stainless interconnecting tube and stainless fittings. It will have a air return and maybe a rubber diaphragm so the internal pressures cant build up. I've also calculated the volumetric change of the mercury for a 10 degrees C temperature rise and the volumetric change of the holding vessel for the same change of temperature. From that I've worked out the optimum height for the holding vessel so the sensor plate will rise and contract with the height change of the mercury. It can never be exact, but it will help. You worked on some amazing things, ever thought of writing a book on seismic instrumentation.? Thanks for your mail regards Arie. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Brett Nordgren Subject: Good luck Date: Thu, 03 Dec 1998 09:30:59 -0500 Sean-Thomas, I have been going back and reading the list archives of your early discussions about the seismometer (before I was on the list). And I keep finding information that exactly matches what I've been trying to duplicate. I'd highly recommend to anyone who's interested that they spend plenty of time going over those archives; there is a lot in there. Good luck with your paper. Hope you can give us all a report when you get back. Brett Nordgren _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: George Harris Subject: Re: Northern California PSN meeting in December Date: Tue, 01 Dec 1998 22:37:30 +0000 I plan to be at the meeting. George Harris - Benicia _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: 1998 Public Seismic Network meeting at USGS, Menlo Park Date: Thu, 03 Dec 1998 13:24:30 -0700 PSN Members- The PSN meeting with be held at 7:30 PM on Tuesday night, 8 Dec 1998, at the USGS, Conference Room 8111 (first floor). Building 8, 345 Middlefield Road, Menlo Park, CA; see maps: Buildings 7&8 are on the northwest corner of Middlefield & Willow Road. Park your car in the parking lot on the north side of the Buildinng 7. There is a narrow enclosed walkway that joins the two buildings, and this is also the main entrance where you should enter. Tell the guard at the door that you are there to attend the Public Seismic Network meeting and you will have to sign the logbook. I plan to chauffer any people attending AGU who also want to attend the PSN meeting on Tuesday at 7:30 PM 8 Dec at USGS Menlo Park, such as John Taber. I will be at AGU on Tuesday during the day, and pick up any PSN people at the Moscone Center and depart at 6:00 PM to drive down to USGS Menlo Park (since I will be the USGS representative, I want to be sure that I get to USGS Menlo Park to make sure everything is arranged before the other PSN members arrive for the meeting at 7:30 PM). After the meeting I will drive the AGU people back to their hotels in San Francisco. So if you want a ride, be in front of the Moscone Center at 6:00 PM. Some pizza and soft drinks will be delivered for dinner. See you on Tuesday. -Edward -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Rex Klopfenstein, Jr." Subject: PSN-Linux Software List Date: Thu, 03 Dec 1998 19:41:10 -0500 Is there a list of Linux software that is available for seismic monitoring and processing. -- Rex Klopfenstein, Jr. Bowling Green, OH rklopfen@......... www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: Re: Good luck Date: Thu, 3 Dec 1998 18:39:03 -0600 (CST) Brett, I appreciate your support, but I guess you missed my message that I would be unable to attend the AGU because of a lack of funding. I did recieve several generous offers of local lodging to cut the hotel cost, but I am somewhat handicapped and needed to be very close to the Moscone center. I might ask Edward to post my email and web addresses on my poster panel. Regarding the technical info available in the PSN archives: I have maintained files of all the technical briefs that I have offered over the past year or so, about 400 of them. If there is an interest, I could paste them into one large file sorted by topics and make it available via the web. The total disk use shows it would be a file of about 800k. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: PSN-Linux Software List Date: Thu, 03 Dec 1998 17:02:32 -0800 Theres a web page called "For Seismologists who are Linux users" at http://www.seismo.unr.edu/ftp/pub/ichinose/LINUX/seismolinux.html with links to Linux seismo software. -Larry Cochrane Redwood City, PSN At 07:41 PM 12/3/98 -0500, you wrote: >Is there a list of Linux software that is available for seismic >monitoring and processing. > > >-- >Rex Klopfenstein, Jr. >Bowling Green, OH >rklopfen@......... >www.wcnet.org/~rklopfen _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Francesco" Subject: R: PSN-Linux Software List Date: Fri, 4 Dec 1998 02:06:13 +0100 See at http://orfeus.knmi.nl/=20 There is the most complete list of shareware and free software for = simsmologist; many programms for Linux platform. Regards Francesco Nucera - I.ES.N. - PSN ITALY
See at
http://orfeus.knmi.nl/=20
There is the most complete list of shareware and = free software=20 for simsmologist; many programms for Linux platform.
 
Regards
 
Francesco Nucera   - I.ES.N.  = -   PSN=20 ITALY
From: ralvarez@........ (Raul Alvarez) Subject: Re: Good luck Date: Thu, 3 Dec 1998 18:07:09 -0700 (MST) >Regarding the technical info available in the PSN archives: I have >maintained files of all the technical briefs that I have offered over >the past year or so, about 400 of them. If there is an interest, I could >paste them into one large file sorted by topics and make it available >via the web. The total disk use shows it would be a file of about 800k. > >Regards, >Sean-Thomas Hello Sean, I, for one, would like to see and use the information. Raul ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Update on DSL line and IP address change Date: Thu, 03 Dec 1998 17:34:10 -0800 Hi Everyone, Today my ISP made the last of the changes needed to move over to the new DSL line. They changed the IP address of PSN.QUAKE.NET to the new DSL IP address. The old IP address was 198.68.231.1 and the new one is 216.100.224.130. In 3 days I will disconnect the 28k modem, hopefully permanently. It can take 3 days for all of the DNS servers on the Internet to update their databases with new info, so I need to wait awhile before I can do the disconnect. If anyone has problems accessing psn.quake.net, either using the web or using email, please let me know ASAP by using my cochrane@.............. email address. Thanks, -Larry Cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Re: Good luck Date: Thu, 03 Dec 1998 18:46:24 -0800 Sean Thomas I for one would be interested Regards barry S-T Morrissey wrote: > Regarding the technical info available in the PSN archives: I have > maintained files of all the technical briefs that I have offered over > the past year or so, about 400 of them. If there is an interest, I could > paste them into one large file sorted by topics and make it available > via the web. The total disk use shows it would be a file of about 800k. > > Regards, > Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Earthquakes update Date: Thu, 03 Dec 1998 23:04:40 -0400 PSN Ever since my email a few weeks ago requesting help in setting up a new PSN here on the Caribbean island on Dominica, I have not updated you on earthquake activity. A few days after my email, the earthquake numbers went down from over 100 per day to just 2 to 4 small events per day. Activity stayed at this relatively low rate until early this morning. I was in the south of the island where the quakes are centered and felt 2 within 30 minutes. 20 minutes after I left, 2 more were felt. The number of felt quakes is already in the region of 8 which means that the number of small, unfelt ones may be higher. We are all watching to see if this latest upsurge in going to continue or diminish. Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Gary McCool Subject: Re: Technical Briefs Date: Thu, 03 Dec 1998 22:03:53 -0500 Sean-Thomas At 06:39 PM 12/3/98 -0600, you wrote: >Brett, >Regarding the technical info available in the PSN archives: I have >maintained files of all the technical briefs that I have offered over >the past year or so, about 400 of them. If there is an interest, I could >paste them into one large file sorted by topics and make it available >via the web. As a Lurker that has been following your discussions, I would very much like to see this info available. I am building a Lehmann at Perkins Observatory in Delaware, Ohio. I have my Radio Shack woofer and looking to start the Vertical. Regards Gary McCool _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Brett Nordgren Subject: Re: Good luck Date: Thu, 03 Dec 1998 22:47:01 -0500 Sean-Thomas, Yes, I'd missed that, sorry. Glad your poster gets to go, anyway. Wouldn't surprise me if you were able to get some interesting contacts if you put on your addresses, as you mentioned. I, too, would be very interested in having an archive of what you've written. How does that relate to the "stm-mail.zip" file from the PSN archives? I think Bob Barns may have put that together some months ago. From its size it sounds like you're talking about something that may be somewhat more extensive. Also, didn't you put up an AutoSketch file of the latest mechanical configuration? Since I now have A-S, it would probably be helpful for some of the geometry stuff I want to try to figure out. Greatly looking forward to seeing anything you have. Best regards. Brett At 06:39 PM 12/3/98 -0600, you wrote: >Brett, > >I appreciate your support, but I guess you missed my message that I >would be unable to attend the AGU because of a lack of funding. I did >recieve several generous offers of local lodging to cut the hotel cost, >but I am somewhat handicapped and needed to be very close to the Moscone >center. I might ask Edward to post my email and web addresses on >my poster panel. > >Regarding the technical info available in the PSN archives: I have >maintained files of all the technical briefs that I have offered over >the past year or so, about 400 of them. If there is an interest, I could >paste them into one large file sorted by topics and make it available >via the web. The total disk use shows it would be a file of about 800k. > >Regards, >Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Earthquakes update Date: Thu, 03 Dec 1998 21:24:56 -0700 Wayne- Keep on shaking; just a little bit. See you in a couple of weeks. -Edward Wayne Abraham J73WA wrote: > PSN > > Ever since my email a few weeks ago requesting help in setting up a new > PSN here on the Caribbean island on Dominica, I have not updated you on > earthquake activity. > > A few days after my email, the earthquake numbers went down from over > 100 per day to just 2 to 4 small events per day. Activity stayed at this > relatively low rate until early this morning. I was in the south of the > island where the quakes are centered and felt 2 within 30 minutes. 20 > minutes after I left, 2 more were felt. The number of felt quakes is > already in the region of 8 which means that the number of small, unfelt > ones may be higher. We are all watching to see if this latest upsurge in > going to continue or diminish. > > Wayne > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Good luck Date: Thu, 03 Dec 1998 21:28:15 -0700 Sean-Thomas- I can put up a sign and website on your poster, if you wish. Please let me know. -Edward S-T Morrissey wrote: > Brett, > > I appreciate your support, but I guess you missed my message that I > would be unable to attend the AGU because of a lack of funding. I did > recieve several generous offers of local lodging to cut the hotel cost, > but I am somewhat handicapped and needed to be very close to the Moscone > center. I might ask Edward to post my email and web addresses on > my poster panel. > > Regarding the technical info available in the PSN archives: I have > maintained files of all the technical briefs that I have offered over > the past year or so, about 400 of them. If there is an interest, I could > paste them into one large file sorted by topics and make it available > via the web. The total disk use shows it would be a file of about 800k. > > Regards, > Sean-Thomas > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: Earthquakes update Date: Thu, 03 Dec 1998 21:39:13 -0700 Wayne Abraham J73WA wrote: > PSN > > Ever since my email a few weeks ago requesting help in setting up a new > PSN here on the Caribbean island on Dominica, I have not updated you on > earthquake activity. > > A few days after my email, the earthquake numbers went down from over > 100 per day to just 2 to 4 small events per day. Activity stayed at this > relatively low rate until early this morning. I was in the south of the > island where the quakes are centered and felt 2 within 30 minutes. 20 > minutes after I left, 2 more were felt. The number of felt quakes is > already in the region of 8 which means that the number of small, unfelt > ones may be higher. We are all watching to see if this latest upsurge in > going to continue or diminish. > > Wayne > Wayne, Can better see the frustration of no local quake information, on these local quakes, as I haven't been able to find any immediate source of reference internet wise to your quakes. (Nothing new). According to old reports the quakes are probably under the Morne Patates volcano, and about 3 Km in depth (that is close!). The past observations were done with 3 telemetered seismos to Trinidad. Landslides, structural damage. Mag 2-3.5 of past. Any new damage, slides, and rough indications of Magnitude of the present swarm? (Let alone other surface indications) I presume there is still telemetry to Trinidad; but I realize its not accessible. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "giacomo" Subject: R: PSN-Linux Software List Date: Fri, 4 Dec 1998 12:30:48 +0100 Grazie Francesco x il sito ma io sono molto spiacente che non ho linux = magari. Stasera se mi ricordo ti mando una bel programmino x nukkare sempre che = tu non l'ho abbi. Ciao=20 G -----Messaggio originale----- Da: Francesco A: PSN-L Mailing List Data: venerd=EC 4 dicembre 1998 2.09 Oggetto: R: PSN-Linux Software List =20 =20 See at http://orfeus.knmi.nl/=20 There is the most complete list of shareware and free software for = simsmologist; many programms for Linux platform. =20 Regards =20 Francesco Nucera - I.ES.N. - PSN ITALY
Grazie Francesco x il sito ma io = sono molto=20 spiacente che non ho linux magari.
Stasera se mi ricordo ti mando una bel programmino x = nukkare=20 sempre che tu non l'ho abbi.
Ciao
G
-----Messaggio = originale-----
Da:=20 Francesco <franuc@......>
A: = PSN-L Mailing=20 List <psn-l@..............>
D= ata:=20 venerdì 4 dicembre 1998 2.09
Oggetto: R: = PSN-Linux=20 Software List

See at
http://orfeus.knmi.nl/=20
There is the most complete list of shareware and = free=20 software for simsmologist; many programms for Linux = platform.
 
Regards
 
Francesco Nucera   - I.ES.N.  = -  =20 PSN ITALY
From: Wayne Abraham J73WA Subject: Re: Earthquakes update Date: Fri, 04 Dec 1998 08:01:34 -0400 Meredith It's 7:30 am Friday Dec 4 and Dominica is just waking up. The local radio station just reported that a quake which occured about 1:00 am caused a large landslide in the Soufriere area, blocking the southern villages access to the City. The Public Works department is now clearing it. I live in the extreme north of the island so I do not feel those quakes. I use the program FFTDSP iterfaced to my sound card and my amateur radio transceiver to monitor a telemetered seismometer which is about 23 miles from the quakes epicenter (thanks to Mike Cook AF9Y for donating this program to our cause). At 05:30Z, I saw a sustained increase in vibrations which lasted for the better part of 30 minutes. FYI, when the latest swarms started, the Seismic Research Unit of the University of the West Indies installed a new network of 6 seismometers which are telemetered to a central computer on island. The seismos are then downloaded by the scientists in Trinidad. The problem is, this information is only available to the public via the almighty Government Information Service which will NOT give the data but rather a summary of events. Recent investigations by the scientists indicate that the latest map of Dominica was off by 1km. This puts the epicenter of the quakes under Mt. Canot, another dome in a tight cluster of Volcanoes in the south-west of Dominica which includes Mt. Patates, Mt. Plat Paye, Mt. Anglais and other unknown ones. Magnitudes are the same 2 to 3.5 but because of the nature of the soil in the area ( pyroclastic deposit) and people actually live on the flanks of all those volcanoes, any movement will crack buildings and cause landslides and rockfalls. I will keep the list posted on relevant updates. Wayne meredith lamb wrote: > Wayne, > > Can better see the frustration of no local quake information, on these > local quakes, as I haven't been able to find any immediate source > of reference internet wise to your quakes. (Nothing new). > > According to old reports the quakes are probably under the Morne > Patates volcano, and about 3 Km in depth (that is close!). The > past observations were done with 3 telemetered seismos to > Trinidad. Landslides, structural damage. Mag 2-3.5 of past. > > Any new damage, slides, and rough indications of Magnitude of > the present swarm? (Let alone other surface indications) > > I presume there is still telemetry to Trinidad; but I realize its not > accessible. > > Meredith Lamb > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Francesco" Subject: R: PSN-Linux Software List Date: Fri, 4 Dec 1998 13:08:35 +0100 Giacomo, il messaggio che ti =E8 arrivato era della mailng list della = PSN ed era diretto ad un collega americano che cercava programmi su = piattaforma Linux..... Fammi sapere che diavoleria mi mandi.....ehehehehe Ciao F
Giacomo,  il messaggio che ti = è=20 arrivato era della mailng list della PSN ed era diretto ad un collega = americano=20 che cercava programmi su piattaforma Linux.....
 
Fammi sapere che diavoleria mi=20 mandi.....ehehehehe
 
Ciao
F
From: John Lahr Subject: Re: Another parallel port AD Date: Fri, 4 Dec 1998 10:07:04 -0700 (MST) Dear Ramon, There is an international group called the Public Seismic Network that links, via an Email listserver and web pages, a large group of people with a common interest in seismology. Many run their own seismic stations, and some have also helped to establish seismic stations at schools. Although I am not running my own seismic station, I am a seismologist with the US Geological Survey and often set up a table-top seismology display for educational purposes. (See OFR-98-0767 at http://greenwood.cr.usgs.gov/ ) My interest is in a very inexpensive AD that can interface a geophone to a PC's serial or parallel port. Dataq Instruments' AD and software that are currently sold for $50 work well, but I'm always on the lookout for alternatives. Similarly, the PSN members are always interested in the topic of AD's linked to seismology software. For more information on the PSN, Dave Nelson operates a web site with an excellent world map of PSN stations ( http://www.seismicnet.com/dave/map.htm ). Lary Cochrane runs the PSN listserver ( http://psn.quake.net/maillist.html ) and a web site: ( http://psn.quake.net/ ) If it's OK with you, I think I will leave it to one of the more electronically inclined PSN members to possibly request more detailed information from you on your AD and software package. Thank you for this generous offer. Cheers, JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan > From mcnor72@.............. Fri Dec 4 04:48 MST 1998 > X400-Received: by /PRMD=iris/ADMD=mensatex/C=es/; Relayed; Fri, > 04 Dec 1998 13:46:32 +0000 > Date: Fri, 04 Dec 1998 13:46:32 +0000 > From: Ramon Ortiz > Subject: Another parallel port AD > To: John Lahr > Content-identifier: 666 > MIME-version: 1.0 (Generated by Ean X.400 to MIME gateway) > X400-Content-type: P2-1984 (2) > X400-MTS-identifier: [/PRMD=iris/ADMD=mensatex/C=es/;981204134632] > X400-Originator: mcnor72@.............. > X400-Recipients: non-disclosure:; > > Dear John, > > Thank you for your interest on our seismic recording system. > We don't understand very well what are your questions or requirements, > but we understand that you are interested on: > 1. The cost of an AD7710 (Analog Device) is about $50 (at least in Spain) > We have been using this AD for a few years and we are really happy with it > 2. The system that you talk about in your message is quite old. Obviously, we have > improved it very much. At this moment, we have two different versions: one for the > parallel port and the other for a serial port. This second version is more compatible > with computers working under Windows. > 3. If your are interested on this system we can send you the description of the system, > the electronical squemes, the PCB and the soft (obviously, free). > > best regards, > > Ramon Ortiz > ______________________________________________________________________________ > RAMON ORTIZ > Dep. Volcanologia Fax: 34.91.564 47 40 > Museo Nal. Ciencias Naturales Tel: 34.91.411 13 28 ext 1163 > c/J. Gutierrez Abascal,2 Email: MCNOR72@.............. > 28006 Madrid SPAIN > ------------------------------------------------------------------------------ > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Re: Update on DSL line and IP address change Date: Fri, 04 Dec 1998 09:09:13 -0800 Larry -- Would you mind posting the current URLs and email addresses of the PSN-related stuff on your server. I want to make sure I have all the list addresses ect. right. Thanks, Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... At 05:34 PM 12/3/98 -0800, you wrote: >Today my ISP made the last of the changes needed to move over to the new >DSL line. They changed the IP address of PSN.QUAKE.NET to the new DSL IP >address. The old IP address was 198.68.231.1 and the new one is >216.100.224.130. In 3 days I will disconnect the 28k modem, hopefully >permanently. It can take 3 days for all of the DNS servers on the Internet >to update their databases with new info, so I need to wait awhile before I >can do the disconnect. > >If anyone has problems accessing psn.quake.net, either using the web or >using email, please let me know ASAP by using my cochrane@.............. >email address. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Re: Sean-Thomas Technical Briefs Date: Fri, 4 Dec 1998 10:26:46 -0700 (MST) Sean, Yes! Great idea. JCLahr Regarding the technical info available in the PSN archives: I have maintained files of all the technical briefs that I have offered over the past year or so, about 400 of them. If there is an interest, I could paste them into one large file sorted by topics and make it available via the web. The total disk use shows it would be a file of about 800k. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Warren Shedrick" Subject: Re: Sean-Thomas Technical Briefs Date: Fri, 4 Dec 1998 09:31:36 -0700 > From: John Lahr > Date: Fri, 4 Dec 1998 10:26:46 -0700 (MST) > To: psn-l@.............. > Subject: Re: Sean-Thomas Technical Briefs > Reply-to: PSN-L Mailing List > Sean, > > Yes! Great idea. > > JCLahr > > > Regarding the technical info available in the PSN archives: I have > maintained files of all the technical briefs that I have offered over > the past year or so, about 400 of them. If there is an interest, I could > paste them into one large file sorted by topics and make it available > via the web. The total disk use shows it would be a file of about 800k. > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L > I would appreciate that also. Thanks Warren Shedrick _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: First TREMOR trigger] Date: Fri, 04 Dec 1998 13:16:49 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Edward Cranswick Subject: [Fwd: TREMOR follow up report] Date: Fri, 04 Dec 1998 13:20:38 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". From: Edward Cranswick Subject: Re: Earthquakes update Date: Fri, 04 Dec 1998 13:33:43 -0700 Wayne- I will try to bring some kind of simple seismic waveform recording system with me when I come to Dominica in two weeks. -Edward Wayne Abraham J73WA wrote: > Meredith > > It's 7:30 am Friday Dec 4 and Dominica is just waking up. The local radio > station just reported that a quake which occured about 1:00 am caused a large > landslide in the Soufriere area, blocking the southern villages access to the > City. The Public Works department is now clearing it. I live in the extreme > north of the island so I do not feel those quakes. I use the program FFTDSP > iterfaced to my sound card and my amateur radio transceiver to monitor a > telemetered seismometer which is about 23 miles from the quakes epicenter > (thanks to Mike Cook AF9Y for donating this program to our cause). At 05:30Z, > I saw a sustained increase in vibrations which lasted for the better part of > 30 minutes. > > FYI, when the latest swarms started, the Seismic Research Unit of the > University of the West Indies installed a new network of 6 seismometers which > are telemetered to a central computer on island. The seismos are then > downloaded by the scientists in Trinidad. The problem is, this information is > only available to the public via the almighty Government Information Service > which will NOT give the data but rather a summary of events. > > Recent investigations by the scientists indicate that the latest map of > Dominica was off by 1km. This puts the epicenter of the quakes under Mt. > Canot, another dome in a tight cluster of Volcanoes in the south-west of > Dominica which includes Mt. Patates, Mt. Plat Paye, Mt. Anglais and other > unknown ones. > > Magnitudes are the same 2 to 3.5 but because of the nature of the soil in the > area ( pyroclastic deposit) and people actually live on the flanks of all > those volcanoes, any movement will crack buildings and cause landslides and > rockfalls. > > I will keep the list posted on relevant updates. > > Wayne > > meredith lamb wrote: > > > Wayne, > > > > Can better see the frustration of no local quake information, on these > > local quakes, as I haven't been able to find any immediate source > > of reference internet wise to your quakes. (Nothing new). > > > > According to old reports the quakes are probably under the Morne > > Patates volcano, and about 3 Km in depth (that is close!). The > > past observations were done with 3 telemetered seismos to > > Trinidad. Landslides, structural damage. Mag 2-3.5 of past. > > > > Any new damage, slides, and rough indications of Magnitude of > > the present swarm? (Let alone other surface indications) > > > > I presume there is still telemetry to Trinidad; but I realize its not > > accessible. > > > > Meredith Lamb > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Richmond Date: Fri, 04 Dec 1998 13:45:25 -0700 Phil- Your records of this morning's M4.1 in Richmond looked good except they are clipped. That is one of the paradoxical aspects of seismology: the larger the event, the more people feel it and focus their attention on it, and the harder it is to record on scale. -Edward Phil Giannini wrote: > Richmond from San Francisco sensors > > ------------------------------------------------------------------------ > Name: 981204A.SFN > 981204A.SFN Type: unspecified type (application/octet-stream) > Encoding: base64 > > Name: 981204A.SFZ > 981204A.SFZ Type: unspecified type (application/octet-stream) > Encoding: base64 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Hernlund Subject: Re: [Fwd: TREMOR follow up report] Date: Fri, 04 Dec 1998 14:12:15 -0700 (MST) On Fri, 4 Dec 1998, Edward Cranswick wrote: Edward, Do you have the locations for each of the stations you mentioned earlier and gave acceleration data for? I am not too familiar with the coverage of the project and would be interested in looking at it on a map. ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Earthquakes update Date: Fri, 04 Dec 1998 14:48:56 -0700 Wayne & Meredith- Do you know of any other sources of seismological information about Dominica other than the sites to which you have referred previously? > Try this site: http://community.wow.net/sru/default.htmI tried it a while ago but > default.htm could not be located. I guess they were updating it. You may also try: > http://www.volcano.si.edu/gvp/volcano/region16/index.htm > This site gives a short discription of two of the 10 volcanoes on Dominica. > > This site may also be of some interest: http://www.cdera.org/sitreps/domquakes.htm > > You may find photos of the Boiling Lake and other photos of interest about Dominica > at: http://www.delphis.dm/photos.htm > Wayne Abraham J73WA wrote: > Meredith > > It's 7:30 am Friday Dec 4 and Dominica is just waking up. The local radio > station just reported that a quake which occured about 1:00 am caused a large > landslide in the Soufriere area, blocking the southern villages access to the > City. The Public Works department is now clearing it. I live in the extreme > north of the island so I do not feel those quakes. I use the program FFTDSP > iterfaced to my sound card and my amateur radio transceiver to monitor a > telemetered seismometer which is about 23 miles from the quakes epicenter > (thanks to Mike Cook AF9Y for donating this program to our cause). At 05:30Z, > I saw a sustained increase in vibrations which lasted for the better part of > 30 minutes. > > FYI, when the latest swarms started, the Seismic Research Unit of the > University of the West Indies installed a new network of 6 seismometers which > are telemetered to a central computer on island. The seismos are then > downloaded by the scientists in Trinidad. The problem is, this information is > only available to the public via the almighty Government Information Service > which will NOT give the data but rather a summary of events. > > Recent investigations by the scientists indicate that the latest map of > Dominica was off by 1km. This puts the epicenter of the quakes under Mt. > Canot, another dome in a tight cluster of Volcanoes in the south-west of > Dominica which includes Mt. Patates, Mt. Plat Paye, Mt. Anglais and other > unknown ones. > > Magnitudes are the same 2 to 3.5 but because of the nature of the soil in the > area ( pyroclastic deposit) and people actually live on the flanks of all > those volcanoes, any movement will crack buildings and cause landslides and > rockfalls. > > I will keep the list posted on relevant updates. > > Wayne > > meredith lamb wrote: > > > Wayne, > > > > Can better see the frustration of no local quake information, on these > > local quakes, as I haven't been able to find any immediate source > > of reference internet wise to your quakes. (Nothing new). > > > > According to old reports the quakes are probably under the Morne > > Patates volcano, and about 3 Km in depth (that is close!). The > > past observations were done with 3 telemetered seismos to > > Trinidad. Landslides, structural damage. Mag 2-3.5 of past. > > > > Any new damage, slides, and rough indications of Magnitude of > > the present swarm? (Let alone other surface indications) > > > > I presume there is still telemetry to Trinidad; but I realize its not > > accessible. > > > > Meredith Lamb > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Re: Earthquakes update Date: Fri, 04 Dec 1998 18:51:46 -0400 Edward I have been searching for information on the internet and just cannot find much. Dr. John Shepherd, the chief of the Seismic Research Unit of the University of the West Indies, met with our amateur radio club a little over a month ago to update us on the events which were taking place on the island. He told us that Dominica is among the least studied islands in the Caribbean and not much data is available. Imagine they are not sure if the cluster of young volcanoes where the earthquake activity is centered are separate volcanoes with their own 'plumbing systems' or part of the bigger Mt. Anglais volcano with several vents. I know that a geologist was on island a few weeks ago taking rock samples etc to try to get some bearing on the Dominica Puzzle. Here is an extract from the book "Caribbean Volcanoes Field Guide". "A recent assessment of high-risk areas in the Americas by an international workshop of volcanologists rated Dominica in the second highest category, in part because of frequent shallow seismicity under its volcanoes. However, Dominica's volcanoes are among the least-studied in the entire arc and presents an exciting challenge for future work. An unusual feature of Dominica's geology is the abundance of young dacitic andesite domes, that form the backbone of the island. Their chemical similarity and the large volume-eruptions associated with their formation may be an indication of the emplacement of a shallow-level batholith within the arc crust under Dominica." I only have a photocopy of the section pertaining to Dominica so I do not know who it is published by. As soon as I find more information I will direct you to it. Wayne. Edward Cranswick wrote: > Wayne & Meredith- > Do you know of any other sources of seismological information about Dominica > other than the sites to which you have referred previously? > > > Try this site: http://community.wow.net/sru/default.htmI tried it a while ago but > > default.htm could not be located. I guess they were updating it. You may also try: > > http://www.volcano.si.edu/gvp/volcano/region16/index.htm > > This site gives a short discription of two of the 10 volcanoes on Dominica. > > > > This site may also be of some interest: http://www.cdera.org/sitreps/domquakes.htm > > > > You may find photos of the Boiling Lake and other photos of interest about Dominica > > at: http://www.delphis.dm/photos.htm > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: [Fwd: TREMOR follow up report] Date: Fri, 04 Dec 1998 16:53:07 -0700 John- I don't have the station locations. I have been aware of this project for several years but always in the capacity of an innocent bystander. John Evans would have supply you with locations. -Edward John Hernlund wrote: > On Fri, 4 Dec 1998, Edward Cranswick wrote: > > Edward, > Do you have the locations for each of the stations you mentioned earlier > and gave acceleration data for? I am not too familiar with the coverage of > the project and would be interested in looking at it on a map. > > ****************************************************************************** > > John Hernlund > E-mail: hernlund@....... > WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ > http://www.public.asu.edu/~hernlund/ > > ****************************************************************************** > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ted Blank Subject: Re: Northern California PSN meeting in December Date: Fri, 4 Dec 1998 15:55:00 -0800 (PST) I am planning to attend. Thanks to everyone who organized it! Jan and I will be bringing our poster material for the Thursday AGU presentation. That bulletin board looked so small last year - but looks much larger when you are the one trying to fill it up! Looking forward to Tuesday. Ted Blank San Jose, California On Sat, 28 Nov 1998, Steve Hammond wrote: > OK so let's speak-up... How many will attend if we have the meeting at > the USGS in Menlo Park at 7:30 on DEC 8TH? Is this good for everybody? > Now is the time to reply-- > > > Edward Cranswick wrote: > > > > Steve- > > Tuesday is good for me, and I am happy to let you coordinate the schedule (of course, > > you might not be so enthusiastic about that). I have started communications with USGS > > Menlo Park about using their office for the meeting, and I don't anticipate that will be > > a problem. > > Hope all is well. Give my regards to Olga, Michelle, and Stephanie. > > -Edward > > > > Steve Hammond wrote: > > > > > Hi Ed, I suggested Tues 8th because that is the only night I can make it > > > that week because of school and work. I just got off the phone with Jan > > > and it's OK with him. Any chance you can get us a room at the USGS in > > > Menlo Park again? > > > > > > Regards, Steve > > > > > > Edward Cranswick wrote: > > > > > > > > PSN- > > > > I am writing this after my previous email that suggested Thursday and then > > > > reading Steve Hammond's email below. > > > > > > > > I can also do Tuesday night. Because of the number of "indigenous PSN" members, > > > > it may be best to use USGS Menlo Park as a compromise site, halfway between San > > > > Francisco AGU and the South Bay. Like last year, I can have pizza delivered, and we > > > > will all have the chance to chat and eat and maybe give helpful suggestions to > > > > Ted&Jan about their AGU presentation on Thursday. I will be in San Francisco at AGU > > > > and I can chauffer people from there to USGS Menlo Park in a rented car. > > > > We need someone local to put all these schedules together. > > > > -Edward > > > > > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > Either opportunity Works for me. Will we be doing it at USGS Menlo Park??? > > > > > > > > Ken Navarre > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > > > > > Steve Hammond wrote: > > > > > > > > > How is Tuesday night 8th at 7:30 sound? That's the only night that week > > > > > I can make it. I got a note from Jan Froom and he said Pete Rowe has his > > > > > station back on-line and would also like to attend. Where do we want to > > > > > get togehter? > > > > > > > > > > Regards, Steve > > > > > > > > > > Larry Cochrane wrote: > > > > > > > > > > > > Steve and Others, > > > > > > > > > > > > If possible I would like to have the meeting when John Taber from New > > > > > > Zealand is here. He arrives Saturday December 5 at 3:15 and leaves Friday > > > > > > 11 at 4PM. If we want to have the meeting during the day we could have it > > > > > > Sunday Dec. 6. If having the meeting in the evening, say around 7:30PM?, is > > > > > > ok, how about Wednesday Dec. 9? > > > > > > > > > > > > -Larry Cochrane > > > > > > Redwood City, PSN > > > > > > > > > > > > At 08:56 PM 11/24/98 -0800, you wrote: > > > > > > >Sorry for the delay in responding... YES! I'ed like to attend. Larry, > > > > > > >please pick a time and date. Can I suggest Sat, 12/12 at 12 for a lunch > > > > > > >meeting in the Palo Alto / Menlo Park area? Maybe we can do pizza and > > > > > > >earthquakes. > > > > > > > > > > > > > >Regards, Steve Hammond > > > > > > >PSN San Jose > > > > > > > > > > > > > > > > > > > > >Ken Navarre wrote: > > > > > > >> > > > > > > >> On Tue, 17 Nov 1998, Larry Cochrane wrote: > > > > > > >> > Given the tremendous response (1) maybe we won' have a meeting... Maybe > > > > > > >> > what we can do is have a more informal diner get together at a restaurant > > > > > > >> > around here. We could do this sometime during the week when you, S-T > > > > > > >> > Morrissey, Edward, and anyone else who would like too attend, will be > > > > > > here. > > > > > > >> > > > > > > > >> > -Larry > > > > > > >> > > > > > > >> Let me know when & where and I'll try to be there. > > > > > > >> Ken > > > > > > > > > > > > _____________________________________________________________________ > > > > > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > > > message: leave PSN-L > > > > > > > > > > _____________________________________________________________________ > > > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > > message: leave PSN-L > > > > > > > > -- > > > > Edward Cranswick Tel: 303-273-8609 > > > > US Geological Survey, MS 966 Fax: 303-273-8600 > > > > PO Box 25046, Federal Center cranswick@........ > > > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > > > > > _____________________________________________________________________ > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > To leave this list email listserver@.............. with the body of the > > > > message: leave PSN-L > > > > > > _____________________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email listserver@.............. with the body of the > > > message: leave PSN-L > > > > -- > > Edward Cranswick Tel: 303-273-8609 > > US Geological Survey, MS 966 Fax: 303-273-8600 > > PO Box 25046, Federal Center cranswick@........ > > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > > _____________________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email listserver@.............. with the body of the > > message: leave PSN-L > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ted Blank Subject: Re: Richmond Date: Fri, 4 Dec 1998 16:06:16 -0800 (PST) Last weekend I migrated the Almaden Country School sensor data collection from an old 486 to a new pentium machine. The reason is so that the data can be collected on the same machine on which WinQuake is running. The Richmond quake this morning was the first recording on the new machine. I will try to put it on the web site tonight. It was definitely clipped - in fact even the S waves went off scale. (We are set up to record and focus on teleseisms as you can imagine). Ted Blank San Jose, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Richmond Date: Fri, 04 Dec 1998 17:23:52 -0700 Ted- Sounds like a good omen, at least for the school program, even if the record is clipped. That would be an excellent record for your poster because everyone knows about the event. See you on Tuesday night. -Edward Ted Blank wrote: > Last weekend I migrated the Almaden Country School sensor data collection > from an old 486 to a new pentium machine. The reason is so that the data > can be collected on the same machine on which WinQuake is running. The > Richmond quake this morning was the first recording on the new machine. > I will try to put it on the web site tonight. It was definitely clipped > - in fact even the S waves went off scale. (We are set up to record and > focus on teleseisms as you can imagine). > > Ted Blank > San Jose, California > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: spring temp comp Date: Fri, 4 Dec 1998 20:12:25 -0600 (CST) Karl, Thanks for the encouragement about the technical notes. I'm giving some thought to some initial sorting of the notes, like: re.amps, re.STM8, re.noise, re.site/pier, etc, so that the file size stays manageable. Regarding the leaf spring temperature correction: my best result has been with using an active electronic IC temperature sensor, the LM35, which has an output of 10mv/degC. Unfortunately it requires additional electronics, including a precision voltage reference (the LM136) to reference it to ambient temperature, so I have hesitated to suggest it. However, if one already has the electronics system for the feedback amps, etc, it is not a difficult add-on. For input to the seis, I wind an additional 25-turn coil of #36 wire above the main speaker coil; it is not in the gap of the magnet. ( The fringing field above the pole is quite strong, and although it has a high gradient, the position feedback keeps the coil in a pretty constant field.) In the photos of the STM8, the coil is visible as the green windings (there are also two 5-turn calibrate coils wound in the same place.) To feed the temperature correction into the coil, I low-pass filter it at several thousand seconds with a buffer amp. This requires that the thermometer electronics, especially the reference voltage, has to be kept very temperature stable, so it is inside nested 6-pack coolers. The actual amount of the correction is adjusted by experiment. I could post the schematic of the microthermometer and the circuit board. However, I still think that mechanical compensation may be preferable. The use of a bimetallic spring from a garden thermometer is a major improvement; I just bought some more to try to double the effect. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: PA Quake Date: Fri, 04 Dec 1998 20:51:05 -0700 Brian- I included your seismogram of the Pymatuning Earthquake on the PSN poster we will present at AGU this Sunday (6 Dec) because your station was the closest seismograph to record the event. -Edward bzimmerman@............ wrote: > Ed. > > I'm a PSN member located 80 km from the quake today. Could I arrange to > meet and go in the field with you when you come to investigate ? > > Dr. Brian Zimmerman > Dept. of Geosciences > Edinboro University of PA > > home phone (814) 734-1242 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Re: spring temp comp Date: Fri, 04 Dec 1998 22:56:06 -0800 Sean Thomas My bimetal coil is working well with my STM8. The problem I'm having is that the leaf spring is continuing to relax over time. I have to move the trim mass back towards the hinge every week or two. The leaf spring got some light rust on it due to winter condensation. This may have lead to relaxation or stiffness changes(thicness). Have you coated and of your leaf springs with say primer paint? I have a second leaf spring (12") vertical which uses a piece of the coil spring from a 16' measuring tape. I also seem to be slightly relaxing over time. Regards Barry. S-T Morrissey wrote: > ---- > I could post the schematic of the microthermometer and the circuit board. > > However, I still think that mechanical compensation may be preferable. > The use of a bimetallic spring from a garden thermometer is a major > improvement; I just bought some more to try to double the effect. > > Regards, > Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Al Allworth" Subject: Fw: Radiation Hazard-Sony Cell Phone Date: Fri, 4 Dec 1998 23:03:37 -0800 ----- Original Message ----- From: henry schuett To: henry schuett Sent: Friday, December 04, 1998 7:13 AM Subject: Radiation Hazard-Sony Cell Phone >Subject: RadHaz >>Date: Fri, 4 Dec 1998 09:18:46 -0500 >> >>Statement of Dale Hatfield >>Chief of the Office of Engineering and Technology >>Concerning Non-compliant Sony Cellular Phones >> >>Sony Electronics, Inc. recently informed the Commission that it has produced >>some wireless telephones that may operate at levels above the guidelines >>established by the FCC to protect the public from exposure to potentially >>harmful levels of radio frequency emissions. The wireless telephones carry >>FCC Identification Numbers L5ACMDB and L5ACMDB2. These wireless telephones >>were manufactured and distributed in the first half of 1998 and are no >>longer being marketed. Approximately 60,000 such units are in the hands of >>consumers, but the actual number of phones that are in violation of the >>FCC's guidelines is not known at this time. >>Any non-compliance with the Commissions emissions guidelines is a very >>serious matter. The Office of Engineering and Technology has advised Sony >>that it has a responsibility to ensure that consumers have phones that >>adhere to the established radio frequency emissions guidelines. Sony has >>initiated a program to notify affected consumers of the possibility that >>phones in their possession do not meet the guidelines, and has established a >>process for the testing and adjusting such phones for FCC compliance, where >>necessary. Questions about this program may be directed to Sony at (888) 914 >>7669. >>We will closely monitor Sony's program to ensure that the FCC's emissions >>guidelines are followed and will not hesitate to take additional action if >>necessary. > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: Update on DSL line and IP address change Date: Sat, 05 Dec 1998 20:19:41 -0800 Karl and Others, Since my ISP agreed to change the IP address, nothing changes as far as URLs or email address. Today I disconnected the 28k modem. Since the modem connection was slowing down the DSL connection for some reason, and now that its disconnected, users should see a improved response time from my Web, FTP and Mail servers. If anyone out there is experincing any problems with the PSN.QUAKE.NET address please let At 09:09 AM 12/4/98 -0800, you wrote: >Larry -- > >Would you mind posting the current URLs and email addresses of the >PSN-related stuff on your server. I want to make sure I have all the list >addresses ect. right. > >Thanks, > >Karl Cunningham >La Mesa, CA. >PSN station #40 >karlc@....... > > >At 05:34 PM 12/3/98 -0800, you wrote: >>Today my ISP made the last of the changes needed to move over to the new >>DSL line. They changed the IP address of PSN.QUAKE.NET to the new DSL IP >>address. The old IP address was 198.68.231.1 and the new one is >>216.100.224.130. In 3 days I will disconnect the 28k modem, hopefully >>permanently. It can take 3 days for all of the DNS servers on the Internet >>to update their databases with new info, so I need to wait awhile before I >>can do the disconnect. >> >>If anyone has problems accessing psn.quake.net, either using the web or >>using email, please let me know ASAP by using my cochrane@.............. >>email address. > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: Update on DSL line & IP address change - Sorry! Date: Sat, 05 Dec 1998 20:47:30 -0800 Sorry, I pressed the wrong button and accidently sent out my last message before completing it. Karl and Others, Since my ISP agreed to change the IP address, nothing changes as far as URLs or email address. Today I disconnected the 28k modem. Since the modem connection was slowing down the DSL connection for some reason, and now that its disconnected, users should see a improved response time from my Web, FTP and Mail servers. If anyone out there is experiencing any problems with the PSN.QUAKE.NET address please let know. I am still having some outage problems with the DSL connection. I'm working with PacBell to correct the problem. They are going to send me a new modem to see if it corrects the problem. So if you can't access PSN.QUAKE.NET and WWW.SEISMICNET.COM this could be the problem. Sorry for the double post. -Larry Cochrane Redwood City, PSN At 09:09 AM 12/4/98 -0800, you wrote: >Larry -- > >Would you mind posting the current URLs and email addresses of the >PSN-related stuff on your server. I want to make sure I have all the list >addresses ect. right. > >Thanks, > >Karl Cunningham >La Mesa, CA. >PSN station #40 >karlc@....... > > >At 05:34 PM 12/3/98 -0800, you wrote: >>Today my ISP made the last of the changes needed to move over to the new >>DSL line. They changed the IP address of PSN.QUAKE.NET to the new DSL IP >>address. The old IP address was 198.68.231.1 and the new one is >>216.100.224.130. In 3 days I will disconnect the 28k modem, hopefully >>permanently. It can take 3 days for all of the DNS servers on the Internet >>to update their databases with new info, so I need to wait awhile before I >>can do the disconnect. >> >>If anyone has problems accessing psn.quake.net, either using the web or >>using email, please let me know ASAP by using my cochrane@.............. >>email address. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: David Josephson Subject: Re: Update on DSL line & IP address change - Sorry! Date: Sat, 5 Dec 1998 20:59:45 -0800 (PST) Larry, I've been using a DSL line via Pac Bell to DNAI for a few months and continue to have intermittent outages that they can't explain. Near as I can tell, the DSL goes into some reconfiguration mode and tries to recalibrate the line. It will be dead for 15-30 sec and then come back; during this period I can't even ping the gateway interface on the other end of the line. -- David Josephson / Josephson Engineering / San Jose CA / david@............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ted Blank Subject: AGU meeting Date: Sat, 5 Dec 1998 21:02:08 -0800 (PST) Ed Cranswick, if you see this could you call me at home this weekend, at (408) 323-8415? Jan and I have a couple of questions. Thanks, and sorry to bother the list, we couldn't get Ed's phone number from the usual sources and the CIA wasn't cooperating. Ted Blank San Jose, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Norman Davis WB6SHI Subject: Re: Earthquakes update Date: Sat, 05 Dec 1998 18:13:51 There are several of us in northern california that have been using FFTDSP for monitoring quakes. I works quite well but many sites are going digital and soon it will be only via the internet or our own sensors. Keep your head down and your resue blanket handy :- } >It's 7:30 am Friday Dec 4 and Dominica is just waking up. The local radio >station just reported that a quake which occured about 1:00 am caused a large >landslide in the Soufriere area, blocking the southern villages access to the >City. The Public Works department is now clearing it. I live in the extreme >north of the island so I do not feel those quakes. I use the program FFTDSP >iterfaced to my sound card and my amateur radio transceiver to monitor a >telemetered seismometer which is about 23 miles from the quakes epicenter >(thanks to Mike Cook AF9Y for donating this program to our cause). At 05:30Z, >I saw a sustained increase in vibrations which lasted for the better part of >30 minutes. Norman Davis WB6SHI Shingle Springs, Ca normd@............. http://www.directcon.net/normd/index.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Unknown Event 12/4/98 16:54 UTC Date: Sun, 06 Dec 1998 10:21:35 -0800 Does anyone have any info on the following event I recorded. I did't find it on any of the lists. The event was at around 12/4/98 16:54:01 UTC. Approx M4.2, about 290km from my location, which is just east of San Diego, CA. I suspect it was to the South or Southeast, in Mexico or the Gulf of California, since it didn't show up on any of the US lists. Thanks, Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: Unknown Event 12/4/98 16:54 UTC Date: Sun, 06 Dec 1998 16:26:06 -0700 Karl Cunningham wrote: > The event was at around 12/4/98 16:54:01 UTC. Approx M4.2, about 290km > from my location, which is just east of San Diego, CA. I live near station TUC and they now have the data online. You can request your event. I just found it. http://www.geo.arizona.edu/tools/seismo It looks like it starts a bit before 16:54 here. Or maybe it's noisey there? The earlier start time would swing it towards Mexico. It looks pretty close also. I'm still not recording. I missed the big one and everything. I've just been putting off drilling the hole through the wall for the wire. I'd also like to get a quality surge protector for the amp power. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ken Navarre Subject: The Menlo Park Meeting... Date: Wed, 9 Dec 1998 09:54:07 -0800 (PST) Last night several of the members of the mail list and AGU/USGS folks got together at the Menlo Park office of the USGS. Our host, Edward Cranswick provided several pizza's and drinks for us to gobble as we all sat around the "round table" which was, in fact rectangular. But let's not diddle over technicalities... The pizzas were retained by the members at one end of the table while the drinks were held by the members at the other. Bartering provided the solution so that eventually we all had more than we probably should have. Each of us introduced ourselves and we spent a few minutes telling one another about our favorite part of seismology, tinkering, working with kids and classroom presentations, or whatever horror tales we found appropriate. It was quickly apparent that this was *no* gathering of nerds - not a pen/pocket protector was to be found... The blend of technical skills, humor, friendship, and hopes was amazing. We had a lot of laughs, a lot of fun, too much pizza, an saw some neat stuff during the "show and tell". Let's see... all together there was: Edward Cranswick Golden Co. Steve Hammond Campbell CA Gary Lindgren Palo Alto, CA Larry Cochrane Redwood City CA Phil Giannini San Francisco CA Ted Blank San Jose CA John Taber Wellington, New Zealand (winner of the long distance award!) Ken Hurst Lebec CA George Harris Benicia CA Jan Froom Gilroy CA Pete Rowe San Jose CA Bruce Kinney San Jose CA Al Broth San Jose CA Ken Navarre Sunnyvale CA Sam Gasdik Berkeley CA Gary Wood Seattle WA So, it was a really good turnout for a middle of the week during the Xmas shopping season! Hopefully some of the other members of the list can make the next meeting. During show and tell Phil Giannini brought a really nice IBM XT "luggable" that he reworked to run on 12 vdc. It included the PC, a VGA monitor, an AT keyboard that had been hacked and crammed into the original keyboard enclosure, the telemetry demod board which had been modified to allow channel selection from the front panel and the A/D card - all inside the old IBM case. It made a really nice package for those of us who like to wander into the field and take our seismic goodies with us! Phil likes to go to the geysers for an outing and monitor the daily earthquakes. John Taber had some of his Quake Finders posters from the AGU presentation. These are really a high quality presentation of the New Zealand high school project to build a student seismology network. Thus far there are 2 schools onboard and he is hopeful that soon there will be 5 schools with gear. He showed photo posters of some of the equipment including a GPS timing receiver that makes the data collected by the student's equipment valuable. It is a great project! Ken Hurst is from JPL and got a lot of laughs when he listed his home address as the intersection of the San Andreas and Garlock faults (Lebec Calif). Beautiful country if you haven't been there! It's at the top of the Grapevine on Hwy 5. Gary Lindgren described his prospective sensor location in his Palo Alto wine cellar. Ted agreed that the location was promising especially considering the number of glasses of fine wine that are useful during the calibration/tuning of the typical Lehman sensor! Many of us nodded agreement! Ted and Jan described their work in the classrooms motivating kids to get involved in the sciences. Larry said that he has been contacted by the Coyote Point Museum inquiring about placing an interactive earthquake demonstration at the San Mateo county facility. So, we can see that the interest from the kids is increasing and there is a need to get equipment and technical assistance to the classroom to keep them motivated and expose them to "science" where they can be a participant. George Harris brought a box of his homemade sensors. We all enjoyed seeing his innovative design for his vertical sensor as well as his multichannel horizontal sensors. Well, I could go on but I really do need to get back to work. Sorry that I couldn't provide an adequate description of the entire event. Everyone had some great stories that gave us insight and information that we can use as we chase our passion (seismic and otherwise...) I REALLY *do* wish that I could replay Edward's comments about seismology, philosophy, marriage, and directions for the pizza driver but I just can't do it justice! Suffice it to say that we all had a lot of fun and enjoyed the meeting. If you we not able to make this meeting I strongly encourage you to try to make the next one! One last bit of business took place that I would like to mention. Steve Hammond reminded us about the huge undertaking that Larry Cochrane has accepted to provide equipment, software, and motivation through the web site. Last year some of us offered him a donation to help offset the cost that he has incurred. Steve wanted to remind us, lest we forget, of the enormity of the project and the dedication that Larry has shown to develop professional quality software and hardware. And, if we were so inclined this might be a good time to look at what we are getting from the work he's done and offer our thanks - and if possible perhaps a donation to keep the work going. Happy holidays, everyone!!! Ken Navarre _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Lucas Haag Subject: Geophones For Sale Date: Wed, 9 Dec 1998 19:37:34 -0600 (CST) I received this message but these are out of my pricerange, maybe this info will be helpful to someone else... >Date: Tue, 08 Dec 1998 20:53:41 -0600 >From: Jim Croix >Reply-To: jim@..................... >Organization: Mitcham Industries >To: lhaag@.............. >Subject: Used Geophones > >Mr. Lucas Haag, >I work for a company which specializes in leases and sales of new & used >seismograph instruments. I have just received in stock a quantity of >60+ geophones manufactured by Geo Space, model HS-10-1. These are 1 Hz >vertical geophones with leveling and coil position indicators. The coil >is 390 Ohms, intrinsic voltage sensitivity is 1.17 V/cm/sec, total >moving mass is 950 gms and dimentions are H 7.625 inches X Dia 4.375 >inches and weight 9.25 pounds. > >These geophones sell new for over $2,000.00. I am offering them in >good, used condition for $400.00 each. > >I am not familiar with eathquake monitoring technique but do understand >that you are interested in very low frequencys. Let me know if you >would like more detail on the Geo Space units. > >Thanks, >Jim Croix >Mitcham Industries Sales & Service Thanks, ************************************************ Lucas Haag HCR 66 Box 25A Bartley, Nebraska 69020-9717 Email: lhaag@.............. World Wide Web: http://www.swnebr.net/~lhaag KC0BJB, Amateur Radio Tecnician Class License ****************************************************** ----- ---- NEBRASKA CORNHUSKER FOOTBALL --- -- NATIONAL CHAMPIONS -- -- -- 1970 -- -- -- 1971 -- -- -- 1994 GO BIG RED!! -- -- -- 1995 -- -- -- 1997 ---- ----- ****************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Doug Crice Subject: Kinemetrics/Analog devices Date: Wed, 09 Dec 1998 19:08:13 -0800 Here's a mildly interesting press release about Kinemetrics selecting an Analog devices accelerometer for use as a strong-motion trigger. http://biz.yahoo.com/prnews/981208/ma_analog__1.html -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: yoyo31@....... Subject: Enviromental Breakthrough Date: Thu, 10 Dec 98 01:02:37 EST This waiste technology stock has gone up every day since being listed. For an investor information package via e-mail and the latest News Release please call our toll free number - 1-877-608-1611 From: John Lahr Subject: Over-priced HS-10's? Date: Thu, 10 Dec 1998 12:15:54 -0700 (MST) Here's a comment by Steve Estes, who is the University of Alaska seismology engineer in Fairbanks, Alaska. JCLahr > From estes@............. Thu Dec 10 09:36 MST 1998 > Date: Thu, 10 Dec 1998 07:39:16 -0900 > From: Steve Estes > To: John Lahr > Subject: HS-10 > > John Lahr wrote: > > > Steve, > > > > This message came across the psn list today. Isn't $400 too > > much for a geospace HS-10-1? Are these geophones any good? > > > > Thanks, > > JCLahr > > > > 20 years ago Biswas had a network of HS-10's, > Brooks range and Fort Yukon area. > They are, in many respects an L4. > Memory is a little fuzzy but as I recall we had problem with > the mass centering in the cold. The springs would shrink and > the mass would top (or bottom) out. > > They may work fine in a temperate climate. > > As to the price. Whatever the market will bear. > Would you pay $400 for and L4 ? > > Keep Smilin' > Steve > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Ted Blank Subject: Date: Fri, 11 Dec 1998 09:40:57 -0800 (PST) Today at the Fall Meeting of the AGU, Jan Froom and I "presented" poster session U42A-27 entitled "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum." I have placed the word "presented" in quotes because Jan and I actually did no presenting at all. All the hard work was done by a group of 12 highly motivated and skilled young scientists from our two local schools. These kids did an absolutely incredible job of explaining their involvement with seismology in the classroom. They patiently explained to anyone who stopped by about how to analyze a seismogram to identify P and S wave arrivals, how to calculate distance to the epicenter, what plate tectonics was all about, how the structure of the earth can be examined by studying earthquakes, and how to use the Seismic Long wave In-situ New Knowledge for Youth (S.L.I.N.K.Y.) device to demonstrate modes of wave propagation through the earth. They are all apparently expert at operating WinQuake as well! They worked in pairs for 30 minutes each and then spent the rest of the time touring the many hundreds of posters being presented on every subject under the sun. When one girl asked me what "correlation" meant I knew that at least one of the kids was really reading the posters! Many kids came back during their "off" time to help out their friends. We received lots of positive comments about the kids from numerous folks. Representatives from IRIS and the AGU Outreach Education project were among them. This is a testament to the professional job these young people did all day. Many grey-haired seismologists got refresher courses in Seismo 101, and most stayed more than 5-10 minutes which is a actually quite a long time given how many other posters compete for your attention. Many thanks again to Ed Cranswick for sponsoring this session and fighting all the battles with AGU. Larry Cochrane rescued our Internet connection and downloaded a copy of WinQuake on the fly (to bail out some dummy who forgot to bring the disk). John Taber, our next door poster neighbor, helped out a lot. We look forward to hooking up with the New Zealand Quake Trackers. Teachers and parents from both schools came along and chaperoned the kids around when they weren't presenting (not that they needed it). Thanks to you all. We met Alan Jones as well, which was a real treat. I've known Alan for many years (he's a former IBMer) but only met once long ago. Alan is the author of the Seismic/Eruption and Seismic Waves programs which are used by many news stations nationwide as well as having a prominent place in the new earth science display at the Smithsonian Museum of Natural History in Washington, D.C. He was very gracious and let the kids re-educate him on seismology from the ground up. The comments from our kids on the way home said it all. They wanted to know if there were any more of these meetings soon, and could they come for an entire week next time! Ted Blank San Jose, California _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: GeE777@....... Subject: Seismic Event Date: Sat, 12 Dec 1998 13:23:21 EST Hello Recorded the following event- 3.6MAG 98/12/12 07:03:11 PST 34.01N 116.78W 17.6 6 mi N of CABAZON If you are on aol 4.0, I can send you the recording I got so give me your aol address George Erich Seismic Exploration Consultant P. O. Box 2011, Norwalk, CA 90651, U. S. A. Phone (562) 868-6013 e-mail GeE777@....... 33 53.90N 118 04.53W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Richmond Date: Sat, 12 Dec 1998 14:15:10 -0700 George- I think it would be useful to post your record to PSN events because even with, or rather exactly because of, the problems of timing and amplitude, it would be good to see how many people recorded the Richmond event and what kind of common problems everyone has with their systems. Of course, you were able to record it on-scale because you were pretty far away. At the PSN meeting on Tuesday evening, we saw some other on-scale records recorded by Pete Rowe and Steve Hammond, both in the South Bay. Phil Giannini's record is clipped because he is in San Francisco, right across the Bay with a ~2-s S-P time. Last Tuesday while attending AGU, my friend Jody and I had lunch with Robert Evans of Sea Ranch, because Jody and Robert are old friends/colleagues from the Sedimentary Geology business. When I mentioned to Robert that I knew a PSN person in Sea Ranch, Robert said that he knew you well. So the PSN is getting to be all over, almost as bad as the KGB. So one of these days, maybe I'll get up to see you in Sea Ranch. -Edward George Bush wrote: > Edward- > > You were commenting on not being able to get a non-clipped trace of the > Richmond event. I recorded it up here at Sea Ranch (86 mi N of Richmond) on > my fine antique Geotech 8700A horizontal seismometer. I had decided not to > upload it to the PSN Event File List, because my timing is not accurate, > and my amplitude is not set and so I can not make any magnitude estimation, > and I live about a block from the ocean and there is quite a bit of noise > on it. > > But if you would like to see it, I can attach it to an email to you. > George -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: Note to PSN] Date: Sat, 12 Dec 1998 16:05:49 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". Steve, can you forward the following note to the PSN... I can't get my VM system to talk to the internet anymore. Thanks.... Jan To add to Ted Blank's note regarding our involvement with the poster session at the AGU Convention yesterday. First a major THANK YOU to Ed Cranswick for making it possible for our students to participate in such an event, and for his personal interaction with our students. They were really impressed that he was actually interested in them and that he would spend time talking and walking around with them. Another THANK YOU to Ted Blank for pulling our end of the project together. Between Ted, Ed and the students, all I had to do... was stand around and admire how well it all came off! While most of us couldn't even read most of the posters, let alone understand them, the kids had no qualms about asking the presenters to explain what they were all about. I was with two girls that asked a young lady from Harvard to explain hers. The Harvard lady tried her best, but as we left, I saw the expression on her face of bewilderment; but when we returned to our group, our girls were explaining to their friends all about this poster and what they had learned. Meeting Alan Jones, being in the company of Ted Blank, Ed Cranswick, John Taber, Larry Cochrane, talking to numerous AGU members that were impressed with our efforts, and seeing our students perform; certainly made any of the efforts I've ever made, well worth it! Thank you for letting me and our SVJH students to be a part of it all.... Jan Froom South Valley Junior High Gilroy CA. From: Edward Cranswick Subject: Commendation of AGU staff for middle school posters Date: Sun, 13 Dec 1998 00:28:33 -0700 Brenda- I wish to thank you, your staff -- Ellen Terry, Kristan Hansen, and Johanna Merryman, in particular -- and other employees at the 1998 Fall AGU Meeting for your cooperation and assistance in making the poster, [U42A-27] "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum" (Blank & Froom), a wonderful experience for the twelve middle school students who presented it. I have attached two email messages from representatives of the two schools involved, the Almaden Country School and the South Valley Junior High School of Science and Technology, which describe the students' response to their AGU presentation. In the last decade, many members of the Public Seismic Network (PSN) from the San Francisco Bay Area and the rest of the Earth, (e.g., [U42A-28] "Quake Trackers - A New High School Seismology Program in New Zealand", Taber & Kozuch) have performed a great deal of volunteer service towards educating school students and the general public about seismology, and last Thursday's poster presentation represents a benchmark of that effort. We look forward to future innovative educational programs in cooperation with AGU. -Edward %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Subject: Date: Fri, 11 Dec 1998 09:40:57 -0800 (PST) From: Ted Blank Reply-To: PSN-L Mailing List To: psn-l@.............. Today at the Fall Meeting of the AGU, Jan Froom and I "presented" poster session U42A-27 entitled "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum." I have placed the word "presented" in quotes because Jan and I actually did no presenting at all. All the hard work was done by a group of 12 highly motivated and skilled young scientists from our two local schools. These kids did an absolutely incredible job of explaining their involvement with seismology in the classroom. They patiently explained to anyone who stopped by about how to analyze a seismogram to identify P and S wave arrivals, how to calculate distance to the epicenter, what plate tectonics was all about, how the structure of the earth can be examined by studying earthquakes, and how to use the Seismic Long wave In-situ New Knowledge for Youth (S.L.I.N.K.Y.) device to demonstrate modes of wave propagation through the earth. They are all apparently expert at operating WinQuake as well! They worked in pairs for 30 minutes each and then spent the rest of the time touring the many hundreds of posters being presented on every subject under the sun. When one girl asked me what "correlation" meant I knew that at least one of the kids was really reading the posters! Many kids came back during their "off" time to help out their friends. We received lots of positive comments about the kids from numerous folks. Representatives from IRIS and the AGU Outreach Education project were among them. This is a testament to the professional job these young people did all day. Many grey-haired seismologists got refresher courses in Seismo 101, and most stayed more than 5-10 minutes which is a actually quite a long time given how many other posters compete for your attention. Many thanks again to Ed Cranswick for sponsoring this session and fighting all the battles with AGU. Larry Cochrane rescued our Internet connection and downloaded a copy of WinQuake on the fly (to bail out some dummy who forgot to bring the disk). John Taber, our next door poster neighbor, helped out a lot. We look forward to hooking up with the New Zealand Quake Trackers. Teachers and parents from both schools came along and chaperoned the kids around when they weren't presenting (not that they needed it). Thanks to you all. We met Alan Jones as well, which was a real treat. I've known Alan for many years (he's a former IBMer) but only met once long ago. Alan is the author of the Seismic/Eruption and Seismic Waves programs which are used by many news stations nationwide as well as having a prominent place in the new earth science display at the Smithsonian Museum of Natural History in Washington, D.C. He was very gracious and let the kids re-educate him on seismology from the ground up. The comments from our kids on the way home said it all. They wanted to know if there were any more of these meetings soon, and could they come for an entire week next time! Ted Blank San Jose, California %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Subject: Note to PSN Date: Fri, 11 Dec 1998 14:29:31 -0700 From: froom@.......... To: shammon1@............. CC: ted@........... "Edward Cranswick, Lakewood, CO ", Cochrane@.............. To add to Ted Blank's note regarding our involvement with the poster session at the AGU Convention yesterday. First a major THANK YOU to Ed Cranswick for making it possible for our students to participate in such an event, and for his personal interaction with our students. They were really impressed that he was actually interested in them and that he would spend time talking and walking around with them. Another THANK YOU to Ted Blank for pulling our end of the project together. Between Ted, Ed and the students, all I had to do... was stand around and admire how well it all came off! While most of us couldn't even read most of the posters, let alone understand them, the kids had no qualms about asking the presenters to explain what they were all about. I was with two girls that asked a young lady from Harvard to explain hers. The Harvard lady tried her best, but as we left, I saw the expression on her face of bewilderment; but when we returned to our group, our girls were explaining to their friends all about this poster and what they had learned. Meeting Alan Jones, being in the company of Ted Blank, Ed Cranswick, John Taber, Larry Cochrane, talking to numerous AGU members that were impressed with our efforts, and seeing our students perform; certainly made any of the efforts I've ever made, well worth it! Thank you for letting me and our SVJH students to be a part of it all.... Jan Froom South Valley Junior High Gilroy CA. -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Geophone Date: Sun, 13 Dec 1998 16:18:19 -0700 Roger- If you mail/express-mail it to me tomorrow and I receive it by Saturday, 19 Dec, I will be able to bring it with me to Wayne when I depart for Dominica on Sunday morning, 20 Dec. Send it to my home address: Edward Cranswick 711 Arapahoe St #5 Golden, CO 80401 TEL: 303-278-0819 and sign-off on it so that it does not require a signature upon delivery, because no one will be home at my apartment, but it is safe to deliver there. Thank you for your interest. -Edward Roger Vaught wrote: > Hi Edward, > > I have just found a AMF Geo Space Geophone I rescued from being thrown > way after testing at Texaco about 6-7 years ago. I have no idea what > the specs are. However, I expect it should still work OK. Is it too > late to send it to you to take to Wayne in Dominica? > > Roger > In Houston -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: The Menlo Park Meeting... Date: Sun, 13 Dec 1998 17:13:12 -0700 Ken- Thank you very much for your witty and literate record and write-up of the 1998 SFBA PSN meeting. -Edward Ken Navarre wrote: > Last night several of the members of the mail list and AGU/USGS folks got > together at the Menlo Park office of the USGS. ... -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Students at the AGU meeting. Date: Sun, 13 Dec 1998 18:10:35 -0700 Catherine- I wish to thank you for your assistance and support in making the poster, [U42A-27] "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum" (Blank & Froom), a wonderful experience for the twelve middle school students who presented it. During the past couple of months, you have been a great source of moral strength to us as we struggled with getting all our ducks in a row for the occasion -- the expressions on the students' faces as they picked up their name badges showed that they felt they belonged at the AGU meeting and that we had all succeeded. I have attached two email messages from the PSN representatives of the two schools involved, the Almaden Country School and the South Valley Junior High School of Science and Technology, which describe the students' response to their AGU presentation. In the last decade, many members of the Public Seismic Network (PSN) from the San Francisco Bay Area and the rest of the Earth, (e.g., [U42A-28] "Quake Trackers - A New High School Seismology Program in New Zealand", Taber & Kozuch) have performed a great deal of volunteer service towards educating school students and the general public about seismology, and last Thursday's poster presentation represents a benchmark of that effort. We look forward to future innovative educational programs in cooperation with you and IRIS. -Edward Catherine Johnson wrote: > Dear Frank, > > I know you're out of town at NSTA but I figured I'd > just pass this info on as follow-up to my earlier > email and as a pre-emptive strike against any possible > confusion amongst the meeting registration folks > at AGU. > > There will apparently be 10 students registering > who are associated with the following abstract submitted > by Ted Blank and Jan Froom > U42A-27: > "Seismic Monitoring in the Classroom - A Complement to the > Traditional Middle School Earth Science Curriculum" > > I think the registration is being coordinated by Ed Cranswick > of the USGS in Golden - he will likely submit the payment, > though of course the students are filling out the necessary > forms. > > Thanks for all your help with this. > > Catherine > > ----------------------------------------- > Dr. Catherine Johnson > Education and Outreach Program Manager > IRIS > 1200, New York Ave., #800 > Washington DC 20005 > > Tel: (202) 682 2220 > Fax: (202) 682 2444 > Email: catherine@........ > Web: http://www.iris.washington.edu/EandO > Personal web page: http://magellan.ciw.edu > ----------------------------------------- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Roger Griggs Subject: Re: Richmond Date: Sun, 13 Dec 1998 18:18:29 -0800 Edward, I also have a unclipped record of the Richmond quake with wwv sync within 5 ms at 100 samples per second. My Lehman picked it up even though it is N-S oriented. I am about 37 miles east of the epicenter. Interested? Roger Griggs, Oakley PSN Station At 02:15 PM 12/12/98 -0700, you wrote: >George- >I think it would be useful to post your record to PSN events because even with, or >rather exactly because of, the problems of timing and amplitude, it would be good >to see how many people recorded the Richmond event and what kind of common problems >everyone has with their systems. Of course, you were able to record it on-scale >because you were pretty far away. At the PSN meeting on Tuesday evening, we saw >some other on-scale records recorded by Pete Rowe and Steve Hammond, both in the >South Bay. Phil Giannini's record is clipped because he is in San Francisco, right >across the Bay with a ~2-s S-P time. > >Last Tuesday while attending AGU, my friend Jody and I had lunch with Robert Evans >of Sea Ranch, because Jody and Robert are old friends/colleagues from the >Sedimentary Geology business. When I mentioned to Robert that I knew a PSN person >in Sea Ranch, Robert said that he knew you well. So the PSN is getting to be all >over, almost as bad as the KGB. So one of these days, maybe I'll get up to see you >in Sea Ranch. >-Edward > >George Bush wrote: > >> Edward- >> >> You were commenting on not being able to get a non-clipped trace of the >> Richmond event. I recorded it up here at Sea Ranch (86 mi N of Richmond) on >> my fine antique Geotech 8700A horizontal seismometer. I had decided not to >> upload it to the PSN Event File List, because my timing is not accurate, >> and my amplitude is not set and so I can not make any magnitude estimation, >> and I live about a block from the ocean and there is quite a bit of noise >> on it. >> >> But if you would like to see it, I can attach it to an email to you. >> George > >-- >Edward Cranswick Tel: 303-273-8609 >US Geological Survey, MS 966 Fax: 303-273-8600 >PO Box 25046, Federal Center cranswick@........ >Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Students at the AGU meeting. Date: Sun, 13 Dec 1998 22:21:39 -0700 NOTE: I forgot to append the two email messages the first time I sent this, and so I am sending again with attached messages. Catherine- I wish to thank you for your assistance and support in making the poster, [U42A-27] "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum" (Blank & Froom), a wonderful experience for the twelve middle school students who presented it. During the past couple of months, you have been a great source of moral strength to us as we struggled with getting all our ducks in a row for the occasion -- the expressions on the students' faces as they picked up their name badges showed that they felt they belonged at the AGU meeting and that we had all succeeded. I have attached two email messages from the PSN representatives of the two schools involved, the Almaden Country School and the South Valley Junior High School of Science and Technology, which describe the students' response to their AGU presentation. In the last decade, many members of the Public Seismic Network (PSN) from the San Francisco Bay Area and the rest of the Earth, (e.g., [U42A-28] "Quake Trackers - A New High School Seismology Program in New Zealand", Taber & Kozuch) have performed a great deal of volunteer service towards educating school students and the general public about seismology, and last Thursday's poster presentation represents a benchmark of that effort. We look forward to future innovative educational programs in cooperation with you and IRIS. -Edward %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Subject: Date: Fri, 11 Dec 1998 09:40:57 -0800 (PST) From: Ted Blank Reply-To: PSN-L Mailing List To: psn-l@.............. Today at the Fall Meeting of the AGU, Jan Froom and I "presented" poster session U42A-27 entitled "Seismic Monitoring in the Classroom - A Complement to the Traditional Middle School Earth Science Curriculum." I have placed the word "presented" in quotes because Jan and I actually did no presenting at all. All the hard work was done by a group of 12 highly motivated and skilled young scientists from our two local schools. These kids did an absolutely incredible job of explaining their involvement with seismology in the classroom. They patiently explained to anyone who stopped by about how to analyze a seismogram to identify P and S wave arrivals, how to calculate distance to the epicenter, what plate tectonics was all about, how the structure of the earth can be examined by studying earthquakes, and how to use the Seismic Long wave In-situ New Knowledge for Youth (S.L.I.N.K.Y.) device to demonstrate modes of wave propagation through the earth. They are all apparently expert at operating WinQuake as well! They worked in pairs for 30 minutes each and then spent the rest of the time touring the many hundreds of posters being presented on every subject under the sun. When one girl asked me what "correlation" meant I knew that at least one of the kids was really reading the posters! Many kids came back during their "off" time to help out their friends. We received lots of positive comments about the kids from numerous folks. Representatives from IRIS and the AGU Outreach Education project were among them. This is a testament to the professional job these young people did all day. Many grey-haired seismologists got refresher courses in Seismo 101, and most stayed more than 5-10 minutes which is a actually quite a long time given how many other posters compete for your attention. Many thanks again to Ed Cranswick for sponsoring this session and fighting all the battles with AGU. Larry Cochrane rescued our Internet connection and downloaded a copy of WinQuake on the fly (to bail out some dummy who forgot to bring the disk). John Taber, our next door poster neighbor, helped out a lot. We look forward to hooking up with the New Zealand Quake Trackers. Teachers and parents from both schools came along and chaperoned the kids around when they weren't presenting (not that they needed it). Thanks to you all. We met Alan Jones as well, which was a real treat. I've known Alan for many years (he's a former IBMer) but only met once long ago. Alan is the author of the Seismic/Eruption and Seismic Waves programs which are used by many news stations nationwide as well as having a prominent place in the new earth science display at the Smithsonian Museum of Natural History in Washington, D.C. He was very gracious and let the kids re-educate him on seismology from the ground up. The comments from our kids on the way home said it all. They wanted to know if there were any more of these meetings soon, and could they come for an entire week next time! Ted Blank San Jose, California %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Subject: Note to PSN Date: Fri, 11 Dec 1998 14:29:31 -0700 From: froom@.......... To: shammon1@............. CC: ted@........... "Edward Cranswick, Lakewood, CO", Cochrane@.............. To add to Ted Blank's note regarding our involvement with the postersession at the AGU Convention yesterday. First a major THANK YOU to Ed Cranswick for making it possible for our students to participate in such an event, and for his personal interaction with our students. They were really impressed that he was actually interested in them and that he would spend time talking and walking around with them. Another THANK YOU to Ted Blank for pulling our end of the project together. Between Ted, Ed and the students, all I had to do... was stand around and admire how well it all came off! While most of us couldn't even read most of the posters, let alone understand them, the kids had no qualms about asking the presenters to explain what they were all about. I was with two girls that asked a young lady from Harvard to explain hers. The Harvard lady tried her best, but as we left, I saw the expression on her face of bewilderment; but when we returned to our group, our girls were explaining to their friends all about this poster and what they had learned. Meeting Alan Jones, being in the company of Ted Blank, Ed Cranswick, John Taber, Larry Cochrane, talking to numerous AGU members that were impressed with our efforts, and seeing our students perform; certainly made any of the efforts I've ever made, well worth it! Thank you for letting me and our SVJH students to be a part of it all.... Jan Froom South Valley Junior High Gilroy CA. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Catherine Johnson wrote: > Dear Frank, > > I know you're out of town at NSTA but I figured I'd > just pass this info on as follow-up to my earlier > email and as a pre-emptive strike against any possible > confusion amongst the meeting registration folks > at AGU. > > There will apparently be 10 students registering > who are associated with the following abstract submitted > by Ted Blank and Jan Froom > U42A-27: > "Seismic Monitoring in the Classroom - A Complement to the > Traditional Middle School Earth Science Curriculum" > > I think the registration is being coordinated by Ed Cranswick > of the USGS in Golden - he will likely submit the payment, > though of course the students are filling out the necessary > forms. > > Thanks for all your help with this. > > Catherine > > ----------------------------------------- > Dr. Catherine Johnson > Education and Outreach Program Manager > IRIS > 1200, New York Ave., #800 > Washington DC 20005 > > Tel: (202) 682 2220 > Fax: (202) 682 2444 > Email: catherine@........ > Web: http://www.iris.washington.edu/EandO > Personal web page: http://magellan.ciw.edu > ----------------------------------------- -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Richmond Date: Sun, 13 Dec 1998 22:26:59 -0700 Roger- Please post it: the more the merrier! -Edward Roger Griggs wrote: > Edward, > I also have a unclipped record of the Richmond quake with wwv sync within 5 > ms at 100 samples > per second. My Lehman picked it up even though it is N-S oriented. I am > about 37 miles east of the epicenter. > Interested? > -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Richmond Date: Sun, 13 Dec 1998 22:41:10 -0700 Larry- Sometime, we (I am not sure who "we" is, though I got some ideas) have got to put a recordsection program together so that all the PSN records of a single event can be plotted at the same time scale* on the same page; something like which is described in -Edward *and next year, at the same amplitude scale. Edward Cranswick wrote: Edward Cranswick wrote: > -------------------------------------------------------------------------- > Your following message has been delivered to the 265 members of > the list psn-l@.............. at 21:27:14 on 13 Dec 1998. > -------------------------------------------------------------------------- > > Roger- > Please post it: the more the merrier! > -Edward > > Roger Griggs wrote: > > > Edward, > > I also have a unclipped record of the Richmond quake with wwv sync within 5 > > ms at 100 samples > > per second. My Lehman picked it up even though it is N-S oriented. I am > > about 37 miles east of the epicenter. > > Interested? > > > > -- > Edward Cranswick Tel: 303-273-8609 > US Geological Survey, MS 966 Fax: 303-273-8600 > PO Box 25046, Federal Center cranswick@........ > Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: HS-10 seismometers Date: Mon, 14 Dec 1998 11:28:52 -0700 (MST) > From MStickney@......... Mon Dec 14 08:50 MST 1998 > From: "Stickney, Mike" > To: lahr@.................. > Subject: FW: HS-10 seismometers > Date: Mon, 14 Dec 1998 08:50:54 -0700 > MIME-Version: 1.0 > > Hi John: > > Jim Zollweg at Boise State University offered the following comments > in response to the recent discussion about HS-10 seismometers. He was > unable to post them to the PSN list and neither was I. I was wondering if > you would be willing to post Jim's comments to the list. > > On a different subject, your on-line open-file report with > information on creating and recording your own earthquake is wonderful. I > haven't had time to go through it carefully yet but hope to be able to use > some of these ideas here in Montana. Thanks for the great contribution. > > -Mike Stickney > > > -----Original Message----- > > From: Stickney, Mike [SMTP:MStickney@.......... > > Sent: Friday, December 11, 1998 3:24 PM > > To: psn-l@.............. > > Subject: HS-10 seismometers > > > > -------------------------------------------------------------------------- > > MStickney@......... is not allowed to post to the list. > > Please contact root@.............. if you have any problems. > > -------------------------------------------------------------------------- > > > > > > Jim Zollweg at Boise State University offered these comments concerning > > the > > recent discussion on HS-10 seismometers but was unable to post to the > > list. > > So I am trying to post his message for him. > > > > -Mike Stickney > > Montana Bureau of Mines and Geology > > > > > > > -------------------------------------------------------------------------- > > > zollweg@.................. is not allowed to post to the list. > > > Please contact root@.............. if you have any problems. > > > > > -------------------------------------------------------------------------- > > > > > > > > > > > > I have a number of HS-10 1 & 2 Hz instruments that I > > > use in my network, and know of some that were used in > > > the INEL network. > > > > > > Briefly, it is important to check the age of the instrument, > > > and its condition. HS-10-1`s manufactured since Oyo took > > > over Geospace (ca 1990) do not seem to hold up well. Older > > > instruments have given lots of service, but even those > > > may be nearing the end of their service life. Mine were > > > manufactured in the early 1970's, and we are experiencing > > > a moderate failure rate (bottoming out permanently, etc). > > > > > > The HS-10-1's do indeed, in my experience, bottom out in cold > > > weather. I have never had that problem with the 2 Hz > > > versions, despite horrific winter conditions at some of the > > > stations where they were installed (temps lower than -40 F > > > for periods up to several weeks). These are more temperate > > > conditions than Brooks Range/Fort Yukon!! > > > > > > The HS10's are a better quality seismometer than the L4. > > > Their parasitic resonances are outside the band of normal > > > seismological interest, which is not the case with the L4. > > > > > > As for whether they're a good buy or not at $400 -- possibly, > > > but look carefully. I don't intend to spend any of my own > > > scarce network funds on them, having had very poor experience > > > with used seismic telemetry equipment in the past. The > > > seismometers may be a different story than amp/vco's, but > > > it pays to be cautious until you know how these seismometers > > > were used or abused. > > > > > > Jim Zollweg > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: Richmond Date: Mon, 14 Dec 1998 13:40:18 -0700 Edward Cranswick wrote: > > Larry- > Sometime, we (I am not sure who "we" is, though I got some ideas) have got to > put a recordsection program together so that all the PSN records of a single > event can be plotted at the same time scale* on the same page; something like > > which is described in > We'll have to pay Larry more money for WinQuake Multistation. ;) I'd really like to know if there's any way that I can make what you made on my computer. Ideally alligned on time instead of signal and horizontal instead of vertical traces. In other words, how'd you do that? I don't mind a few steps to the final product. TIA, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: Re: Tiltmeter publications Date: Mon, 14 Dec 1998 18:42:35 -0600 (CST) Gerhard, Unfortunately there is little written about tiltmeters or their applications, called inclinometry. It is a delicate science, so it is plagued with noise and resolution problems and unrealistic claims about the data. Not the least of which is what the data actually means. Most often, what someone claims is earth tides is really a large diurnal thermal noise of the instrument, the site, or the local meteorology. The solid earth tides have an amplitude of 0.1 to 0.3 microradian, and superimposed smooth sinusoidal periods of about 12 and 24 hours. and we have programs that can calculate what they should be at any time and place, so they can be used for both calibrating the tiltmeter and for removing them, although very few instruments have the data quality that regards the earth tides as noise. I could send you a copy of D.C.Agnews' "Strainmeters and Tiltmeters" which is a very definitive paper on the subject. The "Field Guide" that you asked about is a very nuts-and-bolts (wires and batteries) aid to working on only the tiltmeter that I was using, and is not otherwise applicable. There are no introductory papers that I am aware of. There are also two classes of tiltmeters: geodetic and industrial; the latter have resolutions only to at best 1/1000 of a degree (3 to 5 arc-seconds, or around 20 microradians, and do not sense earth tides. They are used for dynamic motion control and precise aiming of such things as missiles and telescopes, although most telescopes need better pointing. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Richmond Date: Mon, 14 Dec 1998 20:58:26 -0700 Greg- I have to convert seismogram files from PSN format to a USGS format, DR100 format, and then read them into an old DOS program I originally wrote for a PDP 11/70 and then take the output graphics metafile and convert it into to HPGL format which I read into a Windows routine that makes a .GIF-file which I put on a USGS website. I am thinking that there is an easier way which I won't have time to consider until the New Year. -Edward Greg wrote: > Edward Cranswick wrote: > > > > Larry- > > Sometime, we (I am not sure who "we" is, though I got some ideas) have got to > > put a recordsection program together so that all the PSN records of a single > > event can be plotted at the same time scale* on the same page; something like > > > > which is described in > > > > We'll have to pay Larry more money for WinQuake Multistation. ;) > > I'd really like to know if there's any way that I can make what you made > on my computer. Ideally alligned on time instead of signal and > horizontal instead of vertical traces. In other words, how'd you do > that? I don't mind a few steps to the final product. > > TIA, > Greg > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Photos of the Menlo Park PSN Meeting Date: Mon, 14 Dec 1998 20:46:38 -0800 Hi Everyone, I created two web pages documenting our meeting last week. One, http://psn.quake.net/meetings/meeting1298.html, is Ken Navarre's meeting summary (thanks Ken!) and the other, http://www.seismicnet.com/meetings/photos1298.html, has 7 photos taken by Phil Giannini (thanks Phil!). I added some comments and names under each photo. This page is around 192k bytes so it may take awhile for all of the photos to load. Regards, Larry Cochrane Redwood City, PSN _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: RLLaney@....... Subject: Photos of the Menlo Park PSN Meeting Date: Wed, 16 Dec 1998 10:18:48 EST Many thanks Larry for the photos of the PSN meeting. Also, thanks to Edward, Ken, Phil and the others who planned, recorded and attended the meeting. Would liked to have been there. It is always interesting to link faces to the names. Regards, Bob Laney Herndon, VA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: RLLaney@....... Subject: Photos of the Menlo Park PSN Meeting Date: Wed, 16 Dec 1998 10:22:35 EST Many thanks Larry for the photos of the PSN meeting. Also, thanks to Edward, Ken, Phil and the others who planned, recorded and attended the meeting. Would liked to have been there. It is always interesting to link faces to the names. Regards, Bob Laney Herndon, VA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: success story Date: Wed, 16 Dec 1998 11:07:44 -0700 (MST) I think the PSN could be counted as a "mitigation success story" with respect to creating "a better informed community." Maybe someone would be willing to add an entry to this web site: http://www.fema.gov/mit/sstory/ JCLahr _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: [Fwd: STaRS] Date: Wed, 16 Dec 1998 11:36:56 -0700 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". December 16, 1998 Edward Cranswick U.S. Geoogical Survey Dear Edward: Brenda Weaver forwarded your nice message about the poster session, "Seismic Monitoring in the Classroom". I had heard several people comment favorably about it and was really pleased to read the material you sent to Brenda. I think you may be interested in our plans for involving more teachers (and their students) in scientific research. The STaRS initiative depends entirely upon my success as a fund raiser. If I can raise enough money the program will select its first cohort late in 1999. If my efforts are less successful the program will be delayed. I will continue to seek funding until we get it. In other words, I am not going to take "no" for an answer. The STaRS concept is receiving strong support from teachers and scientists across the country. I am confident that this program will help to improve the quality of science education. I hope to raise most of the money from local foundations, but any suggestions you may have about potential funding sources wil be appreciated, as will any comments you offer about the program itself. I am hoping to begin advertising the program early in 1999. If that happens, the first application deadline will be September 1, 1999. The following are excerpts from proposals that I am sending to corporations and private foundations around the U.S. I. What's The Problem? The importance of science in the modern world is generally accepted. In the United States there is also a concern, among educators and many others, that for large numbers of American students pre-college science education is less effective than it should be. The consequences of this deficiency are more obvious than its causes. Nevertheless, when we contemplate the problem of science education two facts are apparent: A. The United States has not attracted enough of its scientifically able young people to pre-college teaching, and those who do enter the teaching profession find it difficult to stay abreast of advances in their field for more than a few years. One reason for the insufficient number of scientifically able pre-college teachers is that, unlike pre-college teachers of the humanities and arts, science teachers are seldom able to pursue their own intellectual adventures. In spite of their demonstrated interest and abilities in science, science teachers in grades 7-12 rarely engage in research after they complete their university degree programs. This situation appears to be a cultural artifact, related to the distribution of research funding. It is neither inevitable or immutable, nor is it true of teachers in other fields: music teachers may be composers and performers in their own right; language arts and social studies teachers may be writers and scholars; art teachers may create and exhibit their work, but for various reasons, science teachers seldom engage in research. While not all science teachers wish to do research, there are many who are interested but lack the opportunity. This lack of opportunity degrades their professional lives, and their example discourages the next generation of potential teachers. Science students sometimes ask why they should give up their personal enthusiasm for scientific inquiry to teach in a school if, instead, they could teach in a college and also share in the excitement and rewards of research. For such students the absence of opportunities to do science may be a telling disincentive to a pre-college teaching career. B. Professional scientists are not sufficiently involved in classroom activities. Many professional scientists are concerned about pre-college science education. They would like to help by sharing their science with teachers and students, but most do so infrequently and sometimes with disappointing results. In order to make significant contributions to science classes scientists need to work closely with experienced teachers and to visit the classrooms repeatedly over an extended period of time. Few scientists have been trained to teach, especially at the pre-college level-many have not entered a pre-college classroom since their own student days-and, in spite of the best of intentions by all concerned, an isolated twenty minute appearance by a research scientist is unlikely to result in much learning within a group of typical students. II. What Can Be Done About It? At the American Geophysical Union (AGU) we believe that the quality of pre-college science education would improve if it were easier for science teachers themselves to do science and for professional scientists to participate more often and more effectively in classroom activities, but working relationships between scientists and teachers are not easy to establish. Both groups are busy and, in spite of some common intellectual interests, their professional worlds are not closely related. The situation needs a catalyst or, perhaps, a match-maker, so we have created STaRS, a national fellowship program that provides convenient opportunities for science teachers to participate in scientific research conducted by AGU scientists and for those same scientists to participate regularly in science classes conducted by the teachers. The American Geophysical Union will administer the STaRS program with support from public and private sponsors throughout the United States. Teachers who are selected to be STaRS Fellows will work as research associates with scientists for six to eight weeks during the summer, usually in laboratory or field locations close to home. In addition to the research activity itself, each STaRS Fellow will be required to develop a lesson plan related to the research topic. Funding will be provided for STaRS Fellows to attend one of the two general AGU meetings during a subsequent year as co-authors on papers and to participate in STaRS project activities at the National Science Teachers Association's (NSTA) National Convention. Participating scientists, drawn mainly from AGU's 25,000 members in the United States, will make regular visits to the STaRS Fellows' classrooms where they will contribute to the research-related activities. The likely positive consequences of the STaRS program are many: Scientists will become better informed about the teacher's work and how scientists can help make science education more vibrant and effective. Teachers will expand their knowledge of science and techniques of research. They will return to their classrooms with fresh material and, more importantly, with greater confidence and enthusiasm. They and their students will experience science as a vital, compelling adventure, drawn along by curiosity and punctuated by surprises. The STaRS Advisory Board, which will oversee the program and select prospective Fellows, consists of three classroom teachers, three AGU scientists, three science education specialists, the Chair of the AGU Committee on Education and Human Resources, and the STaRS Program Management Team. At the national level, in order to attract as many qualified applicants as possible the program will be promoted aggressively through direct and indirect advertising. Winners of the NSF sponsored Presidential Awards for Excellence in Science Education will receive personal invitations to apply for STaRS Fellowships. A direct mail solicitation will be sent to members of the National Earth Science Teachers Association (NESTA). Advertisements will be placed in The Earth Scientist, NESTA's membership journal, as well as NSTA and AGU journals. In the latter, AGU scientists will be asked to identify potential STaRS Fellows in their local schools and to encourage those teachers to apply. Notices will be placed on web pages of federally-funded programs such as the GLOBE program, the Earth Systems Science Education program, and NASA's Earth Science Enterprise Education Program Update. STaRS Fellowship sponsors may restrict awards to specific regions, school districts, or schools. Restricted Fellowships will be awarded only within the specified regions, districts or schools according to the wishes of the sponsors. In addition to the general advertising program described above, science teachers in a designated region, school district or school will receive personal invitations to apply for STaRS Fellowships. Applications will document a teacher's professional preparation and classroom experience. Selection criteria for STaRS Fellowships will include the following: The teacher's interest in an AGU scientific discipline. Because the range of AGU science extends across all natural and physical sciences and mathematics on subjects ranging from the origin of life to the nature of space plasmas, most science teachers will have a research interest in common with AGU scientists. The teacher's proximity to a research opportunity. Priority will be given to applicants who can work with a scientist near their home to promote further interaction after the Fellowship. A few Fellowships may include travel support for the teachers. The teacher's skills or experience relevant to the research project. The teacher's academic record. The teacher's enthusiasm for a research opportunity. Potential for extended benefits in the teacher's school system. Expressed support from the teacher's school administration. For example, as part of the application, the teacher's administration must agree to release time and partial support for the teacher to attend two AGU meetings and one NSTA conference. The Advisory Board will select a pool of preferred applicants on the basis of the selection criteria. In every case an effort will be made to match the needs and resources of the applicant with the most appropriate available research opportunity. After a match has been made, the application will be forwarded to the scientist offering the research opportunity for final approval. Advertisements and articles about the STaRS Program will be placed in Eos, AGU's weekly newspaper. The program will be described and promoted at AGU's general Fall and Spring Meetings. Interested scientists will provide brief descriptions of projects that teachers might participate in and what the teachers themselves would actually do. Because many teachers will require some guidance in acquiring specific knowledge and skills required for projects, scientists will be obliged to provide time for mentoring, especially during the early stages of the Fellowships. Research opportunities will be screened by the Management Team. Projects are to be established research ventures, normally with external grant support. Teachers are to be active participants in strategic design, data collection, and interpretation. Among the criteria for acceptance is a formal commitment by the scientist's institution to provide all necessary accident and health hazard insurance for the teacher while he or she is engaged in the research, whether it be conducted on campus or in the field. A document certifying this commitment will be prepared by AGU's attorneys and will accompany the application materials. Every December a two-day orientation workshop for STaRS Fellows and participating scientists will preceed the AGU Fall Meeting in San Francisco. Fellows will receive travel funds in order to attend both days of this workshop. During the intervening months between the orientation workshop and the summer research period the scientist and the Fellow will prepare for the summer's research. The scientist will provide the Fellow with selected references to study. In some instances the Fellow may attend seminars or other events in other to acquire technical skills or theoretical understanding. During these months Fellows will begin to discuss the science of the forthcoming research with their students and begin the process of involving the scientists in classroom activities. For 6 to 8 weeks during the summer, the STaRS Fellow will participate in an ongoing research project directed by the scientist. This participation will be intellectually challenging for the teacher-not "bottle washing"-and important for the success of the research-not "make-work". Student involvement is an important objective of the STaRS program. In addition to their research activity, STaRS Fellows will be required to engage their own students in related inquiry-based learning activities during the following school year. These activities will include classroom participation by the scientists, student visits to the research sites, and interaction via e-mail and an interactive STaRS web-site. In this way continuing, productive intellectual bonds will be created between scientists, teachers, and students. In the best of circumstances, where the research project is productive and securely funded and where the teacher is enthusiastic and able to make important contributions, the teacher might continue on as a regular member of the research group. In this way, the STaRS program might contribute to a long-term and profoundly significant redefinition and enhancement of the pre-college science teaching profession. Each teacher will work with his or her AGU scientist (or research group) as co-author on a paper for presentation at a subsequent AGU Fall or Spring Meeting. Funding will be provided for the teacher to attend that meeting. Each participating AGU scientist will act as an informal host for his or her STaRS Fellow at the meeting, ensuring that he or she feels welcome and has a productive experience. In addition to the technical sessions and workshops, receptions will be held to bring all attending STaRS Fellows and participating scientists together. The STaRS program will organize events at NSTA conventions where STaRS Fellows will present their research and show other teachers how they are using the research experience in their classrooms. Participating AGU scientists will be encouraged to attend these NSTA meetings and, vis-…-vis the AGU meetings, the teachers will host the scientists. Each STaRS Fellowship costs $7,500, itemized as follows: a.STaRS Fellow Summer Stipend (8 weeks) $4,500 b. STaRS Fellow Travel To AGU Fall Meeting for Training Workshop 750 To AGU Fall or Spring Meeting to Present Paper 750 To NSTA Convention 750 c. AGU Administrative Cost 500 d. STaRS Fellow Incidental Expense Allowance 250 Explanation: a. The stipend is based upon a $30,000 annual salary. b. The travel, as described in Sections III(C) and (E), is required. c. This administrative cost includes only supplies and services (such as mailings, workshops and social gatherings) that are provided directly to STaRS Fellows. Also included are costs of advertising, assessment and AGU staff time. Major administrative costs not covered are salaries and travel funds for AGU scientists, who will be supported through their own budgets at their own institutions. d. The incidental allowance is strictly for books and other research related expenses. Again, thanks for your encouraging message about the students' experience at the Fall Meeting. I hope we will see more groups like the Almaden Country School/South Valley Junior High team. Best wishes, John Dickey Director, Education and Research American Geophysical Union [202] 939-3218 jdickey@....... From: "Charles R. Patton" Subject: Re: Dat... geophone noise Date: Wed, 16 Dec 1998 13:57:37 -0800 Greg wrote: I have my 10 Hz geophone =85 on top of the SDR computer and the noise was lower than when I put it on =85 the carpet=85 lot more than the flat bottom of the running computer. Greg: I=92ve only recently returned from out-of-town and would like to add my comments to the discussion. So far as I understand, the case of a geophone is not connected to the terminals of the geophone. Perhaps Sean or somebody else can correct me if this assumption is wrong as what follows is based on that assumption. A computer and thereby the A/D card and amplifiers used with it are connected to safety (earth) ground through the third wire of the AC power cord. The case of a geophone is capacitively coupled to the coil. In fully differential inputs this would probably be balanced and not a problem, but in most equipment, the input is single ended (referenced to ground) so any current injected will show up on the single ended input. So if the geophone were to be placed in a varying electric field, then some small AC current would flow into the coil through capacitive coupling. This would show up as a signal at the amplifier. The effect would be minimum next to the grounded case of the computer (on top of it, for instance) but when the geophone was out in the middle of the floor the fields generated by the unshielded house wiring would provide a 60 Hz hum field. Proximity to fluorescent lights would also give both electrostatic (bulb) and magnetic fields (ballast).. An easy way to test this hypothesis would be to place the geophone on the floor as before, and then take a aluminum cookie sheet or a large tin can that is electrically connected with a wire to your computer frame and hold it just above the geophone to act as a shield. If the noise level goes down, you have an electric and/or magnetic field interference problem. Charles R. Patton charles.r.patton@........ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: Dat... geophone noise Date: Thu, 17 Dec 1998 00:09:45 -0700 "Charles R. Patton" wrote: > Greg: > I=92ve only recently returned from out-of-town and would like to add my > comments to the discussion. So far as I understand, the case of a > geophone is not connected to the terminals of the geophone. Perhaps I don't think the case is connected to the terminals. I had my el cheapo multimeter stolen a few years ago and I haven't bought a replacement yet. I think it was somehow shorting the magnetic field through the steel computer case. Someone else mentioned this or something similar. I can't remember who though. On a side note I recently found out that just because a company doesn't have a web site today, that doesn't mean they are out of business. ;) I called Mark Products and got their catalog and some prices. The catalog doesn't list at least one geophone some people on the list may be interested in. It's a 4.5 Hz L10B for about $45 without the case. The GeoSpace GS-11D is about $60 for the equivalent. They also have the L4 series and the L22. The L22 is 2 Hz with either vertical or horizontal. He quoted me at about $450 for a vertical L22. The L4 is 1 or 2 Hz vertical or horizontal. The vertical L4 was about $990. These are US dollars for those outside US. They also have a 3D (3 component) model of both the L4 and the L22. I was scared to ask for a price on the 3D models. The phone number for Mark Products is now on the geophone FAQ: http://www.treefort.org/~ghost/geo.html ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Geophone Date: Thu, 17 Dec 1998 10:37:47 -0700 Roger- I got the geophone last night. I opened the box up (very nicely packed), and the jug looks like a Marks Product vertical. Which model is it? Thank you very much. I'll let you know how it goes in Dominica. Merry Xmas & Happy New Year! -Edward Roger Vaught wrote: > Edward, > I tracked it through the Airborne site and it indicates it was delivered > at 11:27 this morning. Have a great trip. > Roger > > Edward Cranswick wrote: > > > > Roger- > > Thank you for sending it. When should I expect it? > > -Edward > > > > Roger Vaught wrote: > > > > > Thanks Edward, > > > > > > It will be sent tomorrow. > > > Roger -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Jewel Star Subject: Re: success story Date: Thu, 17 Dec 1998 13:50:10 -0800 (PST) Mr. Lahr: With all respect, could you please, stop sending me e-mails. Maybe this was a joke of one of my friends. I never e-mail to your website, asking for info. Thank You very much! and....Merry Christmas! Jewel98_1998@......... --- > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L > _________________________________________________________ DO YOU YAHOO!? Get your free @......... address at http://mail.yahoo.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Jewel Star Subject: Re: success story Date: Thu, 17 Dec 1998 13:50:22 -0800 (PST) Mr. Lahr: With all respect, could you please, stop sending me e-mails. Maybe this was a joke of one of my friends. I never e-mail to your website, asking for info. Thank You very much! and....Merry Christmas! Jewel98_1998@......... --- > > > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L > _________________________________________________________ DO YOU YAHOO!? Get your free @......... address at http://mail.yahoo.com _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Dan" Subject: my suprise Date: Thu, 17 Dec 1998 14:40:24 -0800 I live in San Francisco and heard my window shake although I have no equipment yet to detect earth movement I did next best thing and called other side of city, who also felt same thing my question is did anybody receive any record of this or have I lost mind Dan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: rayv Subject: Re: Dat... geophone noise Date: Thu, 17 Dec 1998 18:08:31 -0500 also the magnet of the geophone may be attracted to the case of the computer which is reducing the sensitivity of the geophone. At 01:57 PM 12/16/98 -0800, you wrote: >Greg wrote: >I have my 10 Hz geophone =85 on top of the SDR >computer and the noise was lower than when I put it on =85 the carpet=85 >lot more than the flat bottom of the running computer. > >Greg: >I=92ve only recently returned from out-of-town and would like to add my >comments to the discussion. So far as I understand, the case of a >geophone is not connected to the terminals of the geophone. Perhaps >Sean or somebody else can correct me if this assumption is wrong as what >follows is based on that assumption. > >A computer and thereby the A/D card and amplifiers used with it are >connected to safety (earth) ground through the third wire of the AC >power cord. The case of a geophone is capacitively coupled to the >coil. In fully differential inputs this would probably be balanced and >not a problem, but in most equipment, the input is single ended >(referenced to ground) so any current injected will show up on the >single ended input. So if the geophone were to be placed in a varying >electric field, then some small AC current would flow into the coil >through capacitive coupling. This would show up as a signal at the >amplifier. The effect would be minimum next to the grounded case of the >computer (on top of it, for instance) but when the geophone was out in >the middle of the floor the fields generated by the unshielded house >wiring would provide a 60 Hz hum field. Proximity to fluorescent lights >would also give both electrostatic (bulb) and magnetic fields >(ballast).. An easy way to test this hypothesis would be to place the >geophone on the floor as before, and then take a aluminum cookie sheet >or a large tin can that is electrically connected with a wire to your >computer frame and hold it just above the geophone to act as a shield. >If the noise level goes down, you have an electric and/or magnetic field >interference problem. > >Charles R. Patton >charles.r.patton@........ > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the=20 >message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "J. D. Cooley" Subject: Re: my suprise Date: Thu, 17 Dec 1998 15:17:28 -0800 At 02:40 PM 12/17/98 -0800, you wrote: >I live in San Francisco and heard my window shake although I have no >equipment yet to detect earth movement >I did next best thing and called other side of city, who also felt same >thing my question is did anybody receive any record of this or have I lost >mind >Dan Dan, It is always a BIG help if you can state the date and time you "felt" something so we can look at data to figure out what, if anything, you felt. Below is the information about quakes in your area for 12/17/98. I think what you heard was a sonic boom. The times are UTC so subtract 8 hours to convert to PST. 98/12/17 10:42:25 40.62N 122.40W 24.2 2.1Md A* 4 km NNW of Redding, CA 98/12/17 14:17:10 40.63N 122.41W 23.1 2.1Md B* 6 km NNW of Redding, CA 98/12/17 15:00:46 40.64N 122.41W 23.4 2.9Ml A* 7 km NNW of Redding, CA 98/12/17 18:16:08 40.64N 122.40W 22.4 2.0Md B* 7 km NNW of Redding, CA 98/12/17 22:54:19 40.63N 122.42W 21.3 2.9Md B* 7 km NNW of Redding, CA The last quake happened *after* you posted your e-mail, so that was not the one you heard (unless you are a "sensitive"!). "JD" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: my suprise Date: Thu, 17 Dec 1998 15:29:30 -0800 Dan, I did record anything here in Redwood City or on any of the USGS sensors I am monitoring. -Larry Cochrane Redwood City, PSN At 02:40 PM 12/17/98 -0800, you wrote: >I live in San Francisco and heard my window shake although I have no >equipment yet to detect earth movement >I did next best thing and called other side of city, who also felt same >thing my question is did anybody receive any record of this or have I lost >mind >Dan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone noise Date: Thu, 17 Dec 1998 17:57:10 -0600 (CST) Greg, As I understand the question, you found that the geophone was quieter when resting on a rigid surface than it was when resting on an elastic or soft surface like the carpet. I don't think that it is as much of an electrical or electronic problem as it is a mechanical question. In seismometry, it has long been known that soft, unconsolidated materials, like swamps, greatly amplify any vibrations introduced into the medium. This "site amplification" effect is often studied in conjunction with seismic risk analysis. For example, the Loma Prieta quake south of San Francisco caused much more damage in the soft fill areas of the Marina district than it did in the mountains near the epicenter North of Santa Cruse. Another example is the situation with Mexico city, which is built in a swamp, and suffers much more damage from quakes at the west coast than occurs in the actual epicentral area. So I think that if you put your geophone directly on the earth, or some concrete part of your house foundation, you will find much less noise than either on the carpet or on top of the PC. A few stray comments: the coils in geophones are always isolated from the case, and generally resist sensitivity to external AC fields, like 60hz noise, because they are wound in a "humbucking" configuration, half turning one way, and the other half wound the opposite direction (which is necessary because the coils move in reversed fields at the opposite ends of the magnet). Since the coils will pick up noise capacitively coupled from the case, the case and the shild of the signal cable from the seis should always be grounded to the common of the amplifier power supply, which also should be the frame ground. The central magnet is generally well shielded from outside effects by the steel case, which is the cylindrical shunt of the magnet in small geophones. There is one effect that will decrease the output (and the noise): if the amplifier has any appreciable input offset voltage, it will cause a current in the coil that will cause it to move toward the stops. THis is generally only seeen with long-period sensors, but a high-resistance geophone coil could also be susceptible. I promised some time ago to post some diagrams and photos of geophones and their leaf springs. Maybe tomorrow ..... Now that I can take apart some models without wrecking them, I will try to image the parts. Regards, Sean-THomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Doug Crice Subject: Re: Geophone Date: Thu, 17 Dec 1998 17:27:12 -0800 A lot of Mark Products geophone have the model number and natural frequency hot stamped onto the case. Or, you can take it apart and read the ink on the metal cylinder. -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: STaRS Date: Thu, 17 Dec 1998 23:29:41 -0700 John- Thank you for your description of the comprehensive science/education program that you envision. One of the main points of the the Public Seismic Network (PSN) is to allow everyone to participate and to include the observations and experience of as many people as possible. Other than attempting to facilitate that goal in my somewhat ambiguous role as a connection between the USGS and amateur seismologists of the PSN, I have no larger program nor do I seek to involve myself in one at present. I have learned that the experience of an earthquake can lead the intelligent layman to building a seismograph, but no professional seismologist can make him use it in some standard fashion (we professionals have not yet reached a consensus about what that is exactly). I have previously forwarded the complete text of your email message to the PSN listserver operated by the Redwood City PSN . I believe that enlisting the interest and assistance of a local PSN member is invaluable for any seismology program done in a K-12 school. I wish you good luck in your project and hope that you and the PSN can benefit each other. -Edward JDickey@....... wrote: > December 16, 1998 > > Edward Cranswick > U.S. Geoogical Survey > > > Dear Edward: > > Brenda Weaver forwarded your nice message about the poster session, > "Seismic Monitoring in the Classroom". I had heard several people > comment favorably about it and was really pleased to read the > material you sent to Brenda. > > I think you may be interested in our plans for involving more > teachers (and their students) in scientific research. > > The STaRS initiative depends entirely upon my success as a fund raiser. > If I can raise enough money the program will select its first cohort > late in 1999. If my efforts are less successful the program will be > delayed. I will continue to seek funding until we get it. In other > words, I am not going to take "no" for an answer. The STaRS concept is > receiving strong support from teachers and scientists across the > country. I am confident that this program will help to improve the > quality of science education. I hope to raise most of the money from > local foundations, but any suggestions you may have about potential > funding sources wil be appreciated, as will any comments you offer > about the program itself. .... -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: Dat... geophone noise Date: Fri, 18 Dec 1998 06:35:55 +0000 rayv wrote: > > also the magnet of the geophone may be attracted to the case of the > computer which is reducing the sensitivity of the geophone. The magnet was attracted to the case. I think you might have been the one that said that the first time? It's all kind of irrelevent now. It's in a custom made PVC and plexiglass case ready to go in the ground. I have a hole for it and I tested it out recently. Man! is the thing sensitive to LP now. Noise dropped big time with the sheilded wire. Inside the case in a seperate sealed compartment are 2 or 3 three large rocks. They're sealed with silicone caulking so they won't rattle around at all. That's about it until I finish the whole thing and cover it with dirt. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: FW: letter Date: Fri, 18 Dec 1998 02:10:59 -0700 Mike- I'll put this message in a virtual bottle and throw it into the PSN sea ... -Edward "Stickney, Mike" wrote: > Ed: > Would you care to reply to this request? Is it something the PSN > could get involved with? > > -Mike Stickney > Montana Bureau of Mines and Geology > > > -----Original Message----- > > From: manana.k@....... [SMTP:manana.k@........ > > Sent: Wednesday, December 16, 1998 2:28 AM > > To: mike@................. > > Subject: letter > > > > Dear Sir ! > > > > > > You know that our republic - Georgia is situated > > in the Caucasus > > region, which is known with catastrophycal geophysical > > penomena, and especially earthquares, since 1900 years here > > were about 45 large earthquares. > > On our country there were seismic stations, but now > > they don 't work,because they are old and every equipnent > > works without computer. > > We work at the earthquares problem at the Geophysical > > Centre and want to create one temporary seismic station, but > > our country hasn' t economical means for it. > > We know that in Your country there are some stations, > > which now are closed and maybe someone will help us. > > We ask you for sending relleter with e.mail of such > > station. > > King regards > > > > Otar Lursmanashvili and Manana Kachakhidze > > > > > > > > ____________________________________________________________________ > > Get free e-mail and a permanent address at http://www.netaddress.com/?N=1 -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: GeE777@....... Subject: Recorded Seismic Event Date: Fri, 18 Dec 1998 06:16:53 EST Recorded a seismic event at this station. Approximate Time 1:40 12/18/98 Estimated strength- 4.0 4.0 98/12/18 01:38:59 33.63N 119.06W 6.0 11 mi N of SANTA BARBARA IS. Estimated distance from this station- 55 miles If you are on AOL 4.0, give me your aol address and I will send you a plot of this event. It appears the S wave started before the P wave subsided Station coordinance 33 Deg. 53.87 min North 118 Deg. 04.50 min. West George Erich Seismic Exploration Consultant P. O. Box 2011 Norwalk, CA 90650 U. S. A. Telephone (562) 868-6013 e-mail GeE777@....... _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Gregory Bajuk Subject: Re: Dat... geophone noise Date: Fri, 18 Dec 1998 09:58:48 -0800 (PST) what type of shielded wire did you use? On Fri, 18 Dec 1998, Greg wrote: > rayv wrote: > > > > also the magnet of the geophone may be attracted to the case of the > > computer which is reducing the sensitivity of the geophone. > > The magnet was attracted to the case. I think you might have been the > one that said that the first time? > > It's all kind of irrelevent now. It's in a custom made PVC and > plexiglass case ready to go in the ground. I have a hole for it and I > tested it out recently. Man! is the thing sensitive to LP now. Noise > dropped big time with the sheilded wire. Inside the case in a seperate > sealed compartment are 2 or 3 three large rocks. They're sealed with > silicone caulking so they won't rattle around at all. That's about it > until I finish the whole thing and cover it with dirt. > > ,Greg > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: Dat... geophone noise Date: Fri, 18 Dec 1998 11:18:47 -0700 Gregory Bajuk wrote: > > what type of shielded wire did you use? It's supposed to be for long runs of audio line level cable. The connectors are metal RCA types. I got it at Radio Shack. It was the only thing in the store except coax. I don't have the shield strands connected to anything on either end, so I'm wondering if it isn't a little attenutated because of the longer run and smaller wire. The wire I got from Radio Shack is stranded, but I was using solid before this. When I finally drill a hole in the brick wall I'll be able to trim the wire a little and find out. Also I have some soldered connections now. Everything was just wrapped before. Who knows? Maybe it's just the rocks in the case reducing the high frequency noise? I can't take it out now, because it's siliconed in. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone parts images Date: Fri, 18 Dec 1998 18:43:45 -0600 (CST) I have scanned some images of various parts of geophones to satisfy the curiosity of those who are wondering what is inside one. This is a preliminary effort that might be tidied up later and/or revised if I get some feedback and suggestions. It is a large jpeg file (250k) at: http://www.eas.slu.edu/People/STMorrissey/stmmisc.html " PSN INFO ... " Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Update on Dominica Date: Sun, 20 Dec 1998 08:16:29 -0400 PSN Earthquake activity has subsided somewhat over the past week or two. However, small felt events continue at a rate of about 3 per day. Two days ago, events "seem" to have taken a rather bizarre turn. Rather that the normal rumbling which accompanied the previous quakes, residents are now reporting a sound more like a sonic boom or small explosion. As usual, nobody is on island to answer question so I have to resort to the internet to educate myself. Does anybody who has experience in volcanic activity have ideas on the reason for the sound-change? Thanks, Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone installation Date: Sat, 19 Dec 1998 23:13:00 -0600 (CST) Greg and company, Some questions have been raised about wiring a geophone to an amplifier. The amplifier gain will need to be in the range of x1000 or higher, so noise considerations are important. The wiring of the geophone signal coil to the amplifier can be either single ended or be balanced, (often called differential), depending on the amplifier input configuration. and the location of the amplifier. (And don't forget to install a damping resistor across the signal coil). In the single ended connection, one side of the coil is connected to common, and is what we generally do for short signal runs of several feet. We actually prefer to have a preamplifier right at the seismometer or geophone. For this connection, the shield of the cable is the common connection for the signal. Hence, any noise induced on the shield is part of the data, which is why it should be short. For longer runs, a balanced line is used, which can be realized with any shielded pair data cable (from electronic surplus store, or supplier), or with stereo audio cable and RCA type connectors. The wire size is relatively unimportant, since the little current flows from the geophone. Here, the two center conductors are used for the signal from the coil to the amplifier (where one side may be connected to the amplifier common). The shields of the cable are connected together and to the common and frame ground at the amplifier ONLY. THe shields should NOT be connected at BOTH ends, since this allows noise currents to flow along the shield, inducing noise in the signal leads. An INDEPENDENT insulated ground conductor should be connected between the geophone case and the amplifier common and case, which is where the earth ground should also be connected. Some other notes: the fact that a geophone is magnetically attracted to a steel surface does not decrease its output; if anything, it might be very slightly greater because of the greater external shunt return provided to the central magnet. The coils move in the strongest fields around both ends of the magnet, which are not reduced by exteranl influences. Also: about local vibrations being influenced by the installation method or configuration, recall that the wavelength is quite long. A 100 hz wave traveling at 2 kilometers per second (typical seismic surface waves) has a wavelength of 20 meters; the 1 hz wavelength is 2000 meters. So any physical geometry significantly less than this will not affect the response. The need to bury the sensor as deep as practical is because the soft soils at the surface have very slow velocities, and hence transmitt shallow noises quite well, but the ground becomes much more consolidated and undisturbed at even 1 meter depths. And for reference, a car engine idling at 600 RPM is producing a 10hz vibration which can often be sensed by a geophone (if the car is not moving). An 1800 RPM window fan makes a 30 hz vibration. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Edward Cranswick Subject: Re: Update on Dominica Date: Sat, 19 Dec 1998 22:21:03 -0700 Wayne- Other than the conclusion that since the signals are higher frequency, the sources would seem to be closer to the surface, I have no knowledge about the phenomenon -- but I am looking forward to hearing you explain what you have learned when Jody and I arrive on Monday morning. -Edward Wayne Abraham J73WA wrote: > PSN > > Earthquake activity has subsided somewhat over the past week or two. > However, small felt events continue at a rate of about 3 per day. Two > days ago, events "seem" to have taken a rather bizarre turn. Rather that > the normal rumbling which accompanied the previous quakes, residents are > now reporting a sound more like a sonic boom or small explosion. As > usual, nobody is on island to answer question so I have to resort to the > internet to educate myself. Does anybody who has experience in volcanic > activity have ideas on the reason for the sound-change? > > Thanks, > Wayne > > _____________________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email listserver@.............. with the body of the > message: leave PSN-L -- Edward Cranswick Tel: 303-273-8609 US Geological Survey, MS 966 Fax: 303-273-8600 PO Box 25046, Federal Center cranswick@........ Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Roger Sorensen Subject: Re: geophone installation Date: Sat, 19 Dec 1998 21:21:35 -0800 S-T Morrissey wrote: .... other good stuff removed ... > (And don't forget to install a damping resistor across the signal coil). Question 1: How do you select a value for the damping resistor. Question 2: Has anyone played with having 2 amps for the same geophone - One with the usual amplification and a second one with less amplification? The thought was to be able to record quakes that clip on the first channel. (no I can't afford a better atod card ;-) Is it possible to have a 1:1 pre amp and then have two amp/filters to feed two channels??? Good Idea? Dumb Idea? Roger - Chatsworth CA USA 34.271N 118:593W (for those of you with cruise missiles) _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Walt Williams" Subject: PSN-L: 24" Wide Paper Roll Date: Sun, 20 Dec 1998 02:40:03 -0800 All, Source for 24" wide paper, 200 ft length on plastic roll, maybe useful for graphs? See: http://www.sciplus.com/cgi-bin/basket/914149922.8/everything/ 27831.html Seasons Best to All, Walt Williams, 98.12.20 dfheli@.............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "james dunn" Subject: Re: Update on Dominica Date: Sun, 20 Dec 1998 11:00:18 -0600 -----Original Message----- From: Edward Cranswick To: PSN-L Mailing List Date: Saturday, December 19, 1998 11:22 PM Subject: Re: Update on Dominica >Wayne- > Other than the conclusion that since the signals are higher frequency, >the sources would seem to be closer to the surface, I have no knowledge >about the phenomenon -- but I am looking forward to hearing you explain what >you have learned when Jody and I arrive on Monday morning. >-Edward > >Wayne Abraham J73WA wrote: > >> PSN >> >> Earthquake activity has subsided somewhat over the past week or two. >> However, small felt events continue at a rate of about 3 per day. Two >> days ago, events "seem" to have taken a rather bizarre turn. Rather that >> the normal rumbling which accompanied the previous quakes, residents are >> now reporting a sound more like a sonic boom or small explosion. As >> usual, nobody is on island to answer question so I have to resort to the >> internet to educate myself. Does anybody who has experience in volcanic >> activity have ideas on the reason for the sound-change? >> >> Thanks, >> Wayne >> >> _____________________________________________________________________ >> >> Public Seismic Network Mailing List (PSN-L) >> >> To leave this list email listserver@.............. with the body of the >> message: leave PSN-L > >-- >Edward Cranswick Tel: 303-273-8609 >US Geological Survey, MS 966 Fax: 303-273-8600 >PO Box 25046, Federal Center cranswick@........ >Denver, CO 80225-0046 USA E.M. Forster said, "Only connect". > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone damping Date: Sun, 20 Dec 1998 11:13:16 -0600 (CST) Here is an edited repeat of a previous mote about damping seismometers: Re electromagnetic damping: Most moving coil seismometers only use resistive damping. If properly calculated, no other damping is needed or should be used. Damping is generally expressed in relation to what is needed for "critical" damping, which means that after a step input, the output returns to a zero output voltage as rapidly as possible without overshooting. This damping has a value of 1. But it has a price, namely significant loss of the signal in the damping resistor. So generally damping is set at 0.8 of critical, which cuts the loss by about half, but the overshoot to an impulse input is minimal. Much less than 0.8, the natural period of the seismometer will dominate the response. On the other hand, if a fairly broad response is desired, and the seis and the amplifier have enough output and/or gain, damping as high as 2 can be used. Note that actually calculating the proper resistor depends on how much you know about the geophone or seismometer. The manufacturers data will sometimes even give the value for critical damping. But if the geophone is a mystery device, a generally good approximation is to measure the resistance of the coil and use that value for the damping resistor. To calculate the value of the damping resistor to be used, one first has to know or determine the open circuit damping, called Bo. It is the mechanical air-dashpot function of the coil movement, and is often listed in the specifications for the seismometer. For most seismometers, it ranges from 0.2 to 0.4, where a value of 0.8 is for critical damping. It can also be determined from the logrithmic decrement of the free oscillations of the undamped seismometer. (write for details on logrithmic decrement; you need a recorder or oscilloscope to do it. It involves measuring the successive amplitudes of undamped oscillations). Then the motor constant and resistance of the main coil have to be determined or found in the specifications. The electromagnetic damping Bem needed is determined by subtracting the Bo from the required total Bt. Bem = Bt - Bo (If you don't know your Bo, use a value of 0.3) Then the damping resistor is calculated by: Bem = G^2 / (2*omega*M*(Rs + Rd), or Rd = [G^2 / (Bem*2*omega*m)] - Rs Where Bem is the electromagnetic damping, G is the main coil constant, omega is the angular frequency, equivalent to 2*pi/Tn, where Tn is the natural period, and M is the mass. For an L4-C, with a 5500 ohm coil, with G = 270 V/m/sec, Bo = 0.27, we want Bt to be 0.77, so Bem = 0.5, M = 1 kgm, omega = 2*pi, we calculate a damping resistor Rd of 6102 ohms for critical damping. For an S5000 Long Period Seis, with a 500 ohm coil, G = 100 V/m/sec, Bo = 0.1, we want a flatter response with Bt = 1, so Bem = 0.9, omega = 2*pi/15 (seconds), M = 11 kg, we calculate a resistor of 705 ohms for Bt = 1 (the LP is over damped for a broader response). For an HS-1 4.5 hz geophone with a 1250 ohm coil, G = 41 V/m/sec, and Bo = 0.28; we want critical damping with Bt = 0.8, so Bem = 0.52, omega = 2*pi*4.5 (hz), M = 0.022kg, we calculate Rd = 1348 ohms. This method of damping is the only method currently being used on velocity sensors. The method is so exact that often the resistor for Rd is installed inside the smaller geophones at the factory. Metal-film resistors are used for lower noise. When one is connecting a seismometer to an amplifier with a low input impedance Ra, that value is in parallel with the seismometer, so must be taken into account. So if Ra = 10k ohms, and Rd is to be 5k ohms, the actual resistor to be used is Rs = Rd*Ra/(Ra-Rd), or in this case Rs = 10k ohms. Generally very high input impedance amplifiers are not used because of noise considerations, so this detail is often overlooked. Unfortunately I have no idea what the constants for a Lehman might be. I note that the coil is 1/4 pound of # 34 wire which has 8310 feet per pound and 2168 ohms per pound at 20 deg.C. So assuming the coil is about 500 ohms, I would try a damping resistor of about 1000 ohms, unless you already know the constant G of the main coil and can calculate the value. With this type of damping, the response should be flat to velocity from roughly the natural period to whatever low-pass filter you have in your amplifier. (BTW another place to check to see if the shorter p-wave phases are being filtered out). The drawback of resistive damping, other than the loss of part of the signal from the coil (made up for with less attenuation in the recording circuitry) is that it is dissipative, and makes noise. This is the reason it is not used in the VBB configuration, where the damping is a dynamic process in the feedback loop. The noise from the damping resistor is primarily Johnson or thermal noise, which can be estimated, as well as 1/f noise. A low noise metal film resistor does help. This noise is generally not a problem for most seismometer sites. Regards, Sean-Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: geophone damping Date: Sun, 20 Dec 1998 18:32:46 +0000 One neat thing in the Mark Products catalog is some information about Geophones in general. I found something somewhat relevant to this topic. There is some resistance in the signal wire itself. The catalog calls this "CABLE EFFECT." I personally am not putting any kind of resistor in the case because I don't plan on getting any accurate magnitude data and I sealed the thing up last night. I'll bury it today or tomorrow. The catalog also lists two references for information on Geophones. 1. Shock and Vibration Handbook Harris and Crede, McGraw Hill 2. Electro-Mechanical Transducers and Wave Filters Mason, Van Nostrand One other thing I'd like to mention. Would this work? Put like 4 vertical 4.5 Hz geophones in one case connected to the same amp and filter at about 4 Hz. Wouldn't that boost the LP to almost the level of a 1-2 Hz geophone for about 1/5 - 1/2 the cost? Or maybe use two filters one more gradual around 4 Hz and a steep one at 10 Hz? Would they be better with parallel or series connections? Thanks to Sean-Thomas for all of the info. Although I can't use it, because I want to be done for a while.:) What's a waveform look like again? ;) ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: George Bush Subject: Re: PSN-L: 24" Wide Paper Roll Date: Sun, 20 Dec 1998 11:18:03 -0800 At 02:40 AM 12/20/98 -0800, you wrote: >All, > >Source for 24" wide paper, 200 ft length on plastic roll, maybe >useful for graphs? > >See: >http://www.sciplus.com/cgi-bin/basket/914149922.8/everything/ >27831.html > Yes, I bought one roll to try out and was impressed enough to buy a case of it. The paper is not thin or flimsy, and has a white-smooth surface that takes (liquid) ink with only a little wicking. I discovered that I can cut the rolls in half easily with my radial-arm woodsaw. George Bush Sea Ranch, CA, USA 38.74N, 123.5W _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: FAX paper recording Date: Mon, 21 Dec 1998 01:28:00 -0600 (CST) I have a suggestion regarding the availability of recording paper: do they have a discounted price for FAX paper in rolls? For years heat sensitive paper has been used for standard drum-recorded seismograms, and it still used at major monitoring centers, like NEIS. THe major advantage is that it is inkless, hence relatively foolproof; ink pens either jam or go dry within one coffee break before the quake of the century. The thermal paper is written on with a small warm V-shaped stylus (that is heated with about 1 volt at 0.5 amp). THe GEOTECH helicorder takes a 11" x 35" sheet that costs about $0.30 ea. even in quantity. But FAX paper can also be used if the translation rate can be changed to less than 8" per 24 hours. I have converted a number of Kinemetrics VR-1 drums to FAX paper. I also recommend it for amateur use, since the hot stylus can be made to write a much finer line than inexpensive home rigged ink pens (the ink pens made for seismograms write a 0.1mm line but cost $100.00 and require a very fine commercial ink). For the monitor recorder here (for the STM-8), I have converted an old GEOTECH "Portacorder" to use FAX paper. I use a 2mm/revolution translation rate, at 15mm/min rotation, and get 60 hours of recording on one 8.5" x 24" sheet of FAX paper. So a $9.00 box of 6 standard rolls will last about two years. Regards, Sean-THomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Taber Subject: Re: 1998 Public Seismic Network meeting at USGS Date: Mon, 21 Dec 1998 21:35:07 +1300 (NZDT) I'd like to express my thanks to everyone for the PSN meeting 2 weeks ago. (I realize my thanks are a little late but when I got back from AGU I spent the next week installing seismographs that were and are still refusing to work properly so I'm only now catching up on my email.) I'm very impressed with everything the PSN has done, from the hardware and software to bulletin boards and web pages and especially the friendly and helpful assistance offerred to anyone who asks. It was great to finally meet the people I've been reading about for so long, and having Phil's photos on Larry's web page is a real boost to my poor memory. I don't know when I've met a friendly bunch of guys. Many thanks to Edward for organizing the meeting, providing the pizza, giving Ken Hurst and I ride to and from AGU, and making connections with all the right people at AGU, so that there were no hassles for the students at the poster session. I think Ken Navarre's write-up captured the essence of the meeting: friendship, pizza, and neat stuff (which he somehow did without taking any notes). Meeting the students that Jan and Ted have worked with was a real highlight. Their energy and excitement infected everyone in the poster session. I also think Jan and Ted were far too modest about the work they put in for their poster. The student's enthusiasm clearly stemmed from the guidance and enthusiasm of Jan and Ted, without whom the project would not have been possible. If anyone wants to stop by in Wellington I'd be happy to show you a few seismographs! Cheers, John Taber _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Doug Crice Subject: Re: geophone damping Date: Mon, 21 Dec 1998 09:35:41 -0800 When using a single-ended preamp with a geophone, It's most efficient to design it non-inverting and select the input resistor to equal the desired damping resistance for the geophone. Then select the feedback resistor to give a reasonable gain. That way, you don't waste energy into a separate damping resistor. As far as the two amplifier idea, the correct approach is to use a preamp followed by a second amplifier, then you have two output signal levels. Choose the gain of the preamp low enough so it won't saturate on the big earthquakes, but not any lower. I'm not sure how you determine that value, but gently shaking the geophone in you hand might come close. The preamp will saturate when the input signal multiplied by the gain gets close to the supply voltages. In other words, the output voltage can't be any more than the power supply. Using higher supply voltages buys you a few dB, although selecting parts for low noise is certainly more important. Normally, the preamp will be followed by some filtering to eliminate the signals outside the range of interest. -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: I am done! Woo-hoo! Date: Mon, 21 Dec 1998 11:09:27 -0700 I finished building yesterday and I'm finishing recording my first 24 hrs just now. Now assuming I actually get an event, what do I do with it? I've never had one before. I'd like it to be on the PSN site in other words. The noise levels last night were outstanding (about +-30, where dropping my foot on the floor is about +-150), but nothing happened that I can find. Specifically when I and the rest neighborhood was asleep (0700 - 1200 UTC). Now that the instrument is actually outside, the noise from inside the house is much smaller but still there. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Hernlund Subject: Re: Update on Dominica Date: Mon, 21 Dec 1998 15:17:44 -0700 (MST) On Sun, 20 Dec 1998, Wayne Abraham J73WA wrote: > Earthquake activity has subsided somewhat over the past week or two. > However, small felt events continue at a rate of about 3 per day. Two > days ago, events "seem" to have taken a rather bizarre turn. Rather that > the normal rumbling which accompanied the previous quakes, residents are > now reporting a sound more like a sonic boom or small explosion. As > usual, nobody is on island to answer question so I have to resort to the > internet to educate myself. Does anybody who has experience in volcanic > activity have ideas on the reason for the sound-change? Wayne, From conversations with Stan Williams, Jonathan Lees, and others who study volcanoes and acoustic emissions I remember hearing quite often about gas emissions and their role in creating some fairly strange noises. Jonathan Lees played an audio recording of an eruption in Russia where there was a periodically varying (from 1Hz to 0.1 Hz) blowing sound, which he compared with the periodic vibrations of the outlet on a steam cooker. The idea is that as gases nucleate from the magma due to decompression in the chamber they build up pressure in the vents and other channels leading to the surface. The overlying material, which includes ash and harder igneous rocks (from alternating explosions and oozes) stands in the way of the gas, which has to build pressure until it can bypass the virtual "plug." When the pressure directly underneath the plug is let out through gas emission, the plug seals it up again. Then the vents have a pressure gradient from the bottom near the magma chamber leading to the top of the plug, and the gas flows upwards again thus repeating the process. The frequency of these emissions depends on the porosity of the rock, the plug material, the amount of gas release, the height of the gas system from chamber to plug, the weight of the plug, and many other factors... The booms may be non-explosive gas releases from well sealed plugs that would produce a very high pressure shockwave upon release (from heat as well as pressure). These are worth taking note of, because nobody really understands the whole process all that well. Lees' recordings were done with microphones arrayed around the volcano along with seismometers in order to determine whether the source of the noises was the same as the source of seismic waves. If I remember corectly, he did find a good correlation with one volcano, but it is hard to say what that means for other volcanoes... Stay safe Wayne...hope you can record a bunch of good information! ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: johnccole@........ (john c cole) Subject: Re: FAX paper recording Date: Mon, 21 Dec 1998 20:51:41 -0600 gentlemen one of my three chart recorders is a houston instrument recorder with friction feed. i use computer paper that is about 10" wide. the cost is about $6.75 per box. 1000 feet per box . if recorded on both sides you get 2000 hours per box. in the place of the felt tipped ink pen i use a fine ball point pen. about $2.00 per dozen this works as good or better than the esterline angus chart recorder. (just another echonomical way to it ) as the recording comes out , it folds in a neat stack in front of the machine. to check your recording ,walk out asross the room with ten or twelve hours of info and back again in a few seconds. neat john cole w5auh ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866] _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: johnccole@........ (john c cole) Subject: Re: FAX paper recording Date: Mon, 21 Dec 1998 20:51:41 -0600 gentlemen one of my three chart recorders is a houston instrument recorder with friction feed. i use computer paper that is about 10" wide. the cost is about $6.75 per box. 1000 feet per box . if recorded on both sides you get 2000 hours per box. in the place of the felt tipped ink pen i use a fine ball point pen. about $2.00 per dozen this works as good or better than the esterline angus chart recorder. (just another echonomical way to it ) as the recording comes out , it folds in a neat stack in front of the machine. to check your recording ,walk out asross the room with ten or twelve hours of info and back again in a few seconds. neat john cole w5auh ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866] _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Arie Verveer Subject: Update GSE2.0 to Winquake format. Date: Tue, 22 Dec 1998 16:19:56 +0800 Hi, All, and a Merry ho, ho, ho. For those that are interested the seismic conversion from GSE2.0 format to "Winquake" format, I'm pleased to say the project is on track. Given the amount of time I'm spending on the project and the time it takes me to learn the "C++" and Fortran language, I would estimate it should take about a month to get the "dos" program running. Maybe a there will be a nice windows version to follow. At the moment I can convert there ASCII encoded data back to integer data and read the header info, all in "C". Eventually it should be possible to sent an email to a "autodrm" location and get the raw wave form data from a station of interest. Then convert this GSE2.0 format to a Winquake format and, bingo all the data you ever needed. I then can think about locating the local epicenters. All the best Arie. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Re: Update on Dominica Date: Tue, 22 Dec 1998 08:47:45 -0400 John Thank you for your input. I will have to read this again to try to understand it. I will also print a copy for Ed Cranswick and his friend Jody who are on island now to try to get some professional input (if they can help and if I can break their fun cycle). Wayne John Hernlund wrote: > On Sun, 20 Dec 1998, Wayne Abraham J73WA wrote: > > Earthquake activity has subsided somewhat over the past week or two. > > However, small felt events continue at a rate of about 3 per day. Two > > days ago, events "seem" to have taken a rather bizarre turn. Rather that > > the normal rumbling which accompanied the previous quakes, residents are > > now reporting a sound more like a sonic boom or small explosion. As > > usual, nobody is on island to answer question so I have to resort to the > > internet to educate myself. Does anybody who has experience in volcanic > > activity have ideas on the reason for the sound-change? > > Wayne, > From conversations with Stan Williams, Jonathan Lees, and others who study > volcanoes and acoustic emissions I remember hearing quite often about gas > emissions and their role in creating some fairly strange noises. Jonathan > Lees played an audio recording of an eruption in Russia where there was a > periodically varying (from 1Hz to 0.1 Hz) blowing sound, which he compared > with the periodic vibrations of the outlet on a steam cooker. The idea is > that as gases nucleate from the magma due to decompression in the chamber they > build up pressure in the vents and other channels leading to the surface. The > overlying material, which includes ash and harder igneous rocks (from > alternating explosions and oozes) stands in the way of the gas, which has to > build pressure until it can bypass the virtual "plug." When the pressure > directly underneath the plug is let out through gas emission, the plug seals > it up again. Then the vents have a pressure gradient from the bottom near the > magma chamber leading to the top of the plug, and the gas flows upwards again > thus repeating the process. The frequency of these emissions depends on the > porosity of the rock, the plug material, the amount of gas release, the height > of the gas system from chamber to plug, the weight of the plug, and many other > factors... > The booms may be non-explosive gas releases from well sealed plugs that > would produce a very high pressure shockwave upon release (from heat as well > as pressure). These are worth taking note of, because nobody really > understands the whole process all that well. Lees' recordings were done with > microphones arrayed around the volcano along with seismometers in order to > determine whether the source of the noises was the same as the source of > seismic waves. If I remember corectly, he did find a good correlation with > one volcano, but it is hard to say what that means for other volcanoes... > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "David A. Nelson" Subject: 3 new stations on the maps Date: Wed, 23 Dec 1998 03:27:35 +1300 Seasons greetings to all, yet another year rolls aroundand its great to see the PSN growing from strength to strength, and speaking of which i have added 3 new stations to the maps 2 to the USA map and 1 to the California map please welcome greg spence, tucson, AZ Nicholas Caporossi, east brunswick, NJ and art kapoor, lafayette, (the bay area) CA apologies for taking time getting these added, ill health has been laying me low for many months The New Zealand Seismic Net is steadily growing throughout this year 3 schools and 1 home station have been added to the system. another 2 central Nth Is. NZ stations are planned for early next year and John Taber is working hard getting 3 more schools in the Wellington city, Nth Is., I would like to take this time to thank the core PSN members who are working often behind the scenes. In particular Larry C. and his tireless efforts in supplying of great software and hardware that allows so many of us to produce compatable data files. and our 3 resident professional seismologists.... Ed Cranswick, John Lahr, and S-T Morrissey who keep us all on the straight and narrow (grin). Doug Grice for his long experience with and sharing valuable info on geophones and their use. Input from these guys and all the rest of us with our own fields of specialities make for a very interactive group that keeps up with the new technologies that are available for our experimenting. I'm looking forward to making 1999 another great year for progress with the PSN..... so keep up the experimenting, spread the word, and encourage more ppl to get recording particularly in areas of the world (and ur countries) that are not monitored so far. cheers all have a wonderful xmas and new year Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Hernlund Subject: Re: Update on Dominica Date: Tue, 22 Dec 1998 10:31:04 -0700 (MST) On Tue, 22 Dec 1998, Wayne Abraham J73WA wrote: > John > Thank you for your input. I will have to read this again to try to understand it. > I will also print a copy for Ed Cranswick and his friend Jody who are on island > now to try to get some professional input (if they can help and if I can break > their fun cycle). Wayne, I hate to make this analogy, but it is like the armpit farts that kids make, except there is heat involved as well as pressure. Or think also of geysers and "Old Faithful" with their well defined periodic blowing, which involves ground water instead of magma generated gas. Gases like water, sulfur dioxide, hydrogen sulfide, and carbon dioxide are dissolved in magma, and just like heating a pot of water helps you dissolve more sugar in it, under pressure more gases can be dissolved into the magma. But as the pressure is released, the gases come out, some times explosively at the surface, just as cooling your sugar-water mix causes sugar crystals to form (making rock candy)... ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Re: Update on Dominica Date: Tue, 22 Dec 1998 17:17:22 -0400 John One note though, there is no surface manifestation whatsoever. The quakes are accompanied by those explosions but there is no steam vent. Wayne John Hernlund wrote: > Wayne, > I hate to make this analogy, but it is like the armpit farts that kids > make, except there is heat involved as well as pressure. Or think also of > geysers and "Old Faithful" with their well defined periodic blowing, which > involves ground water instead of magma generated gas. Gases like water, > sulfur dioxide, hydrogen sulfide, and carbon dioxide are dissolved in magma, > and just like heating a pot of water helps you dissolve more sugar in it, > under pressure more gases can be dissolved into the magma. But as the > pressure is released, the gases come out, some times explosively at the > surface, just as cooling your sugar-water mix causes sugar crystals to form > (making rock candy)... > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Hernlund Subject: Re: Update on Dominica Date: Tue, 22 Dec 1998 14:35:01 -0700 (MST) On Tue, 22 Dec 1998, Wayne Abraham J73WA wrote: > One note though, there is no surface manifestation whatsoever. The quakes are > accompanied by those explosions but there is no steam vent. > Wayne Unfortunately, most gas emissions from volcanos are not visible. Special instruments can be used to measure the concentration of these gases, even at a distance, however the main gases remain virtually invisible to the human eye. If you were close, you may see heat ripples, but I wouldn't suggest it! ****************************************************************************** John Hernlund E-mail: hernlund@....... WWW: http://www.mc.maricopa.edu/academic/phy_sci/Geology/hernlund/ http://www.public.asu.edu/~hernlund/ ****************************************************************************** _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: John Lahr Subject: Re: Update on Dominica Date: Tue, 22 Dec 1998 15:38:32 -0700 (MST) Hi Wayne, One possible source of the noise is the P-phase itself. I was in the Imperial Valley of California during a swarm of earthquakes that were shallow and not far away. I could hear them before I felt them. Some microphones were added to one channel of the seismic recorders and it was determined that we were hearing the P-phase and then feeling the S-phase. Dave Hill wrote a paper on this and showed that the earth was acting like a drum head and amplifying the vertical motion of the P-phase. The earthquakes sounded like thunder in the distance. If people are hearing events now, but they did not hear them in the past, this could be due to a change in earthquake location, magnitude, or focal mechanism. JCLahr ################################## John C. Lahr ################################# Seismologist ################################ U.S. Geological Survey ############################### Geologic Hazards Team, MS966 ############################## PO Box 25046 #############################/############################## ############################/############################### Denver, Colorado 80225-0046 ################################ Phone: (303) 273-8596 ################################## Fax: (303) 273-8600 ################################### lahr@........ ##################################### http://giseis.alaska.edu/lahr http://lahr.org/john-jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Roger Baker Subject: Cheap laser pointers and their instrumental implications Date: Wed, 23 Dec 1998 02:23:26 -0600 Friends, A significant new opportunity for amateur scientists who build scientific instrumentation has recently opened up with the appearance of inexpensive laser pointers.=20 The advent of very small and inexpensive (for example $8 on sale at Walgreens Drug stores in Austin, Texas in December 1998) and of good quality has to be considered an important milestone for those who build many kinds of amateur scientific instrumentation. Until quite recently, they were not so cheap and bright and small. One obvious and appropriate application for such inexpensive laser pointe= r technology is my Hi-Q Gravimeter/Seismograph, pretty fully described on m= y web page at =93www.eden.com/~rcbaker=94.=20 Note that there is also a newly appended section on my web page that describes a little more fully how to build sensitive magnetometers in the Amateur Scientist column of the latest (Jan., 1999) Scientific American, and laser pointers are an essential part of this magnetometer project. The key property of this new and inexpensive scientific toy are that the powerful and easily electronically detectable red light beam allows one t= o accurately measure the microscopic motion of many kinds of small objects, down to a nanometer and below, without any appreciable back force.=20 These little key chain pointers, about the size of a lipstick case, have = an optical feedback circuit already built into them so that they are quite bright, enough for the spot to be seen at hundreds of yards, yet they do not ordinarily burn out.=20 Actually, these Asian imports are very finely constructed of threaded bra= ss tubes, complete with mini-circuit board with precision appearance and coated window and precision injection molded optics -- really quite amazi= ng for the price. They incorporate a 3 volt circuit that can easily be modified to run off of two alkaline flashlight batteries. An external pulsing circuit can be added if needed for lock-in amplification, etc., by chopping the battery power supply with any circui= t having a low on-resistance measured in tens of ohms or less. Suitable way= s to do this are by using a power FET or by else by using a quad bilateral switch like a CMOS 4066 chip and paralleling several or all of these switches to give the necessary low on-resistance). One can use them as is, or better with external flashlight batteries, to generate a highly collimated light beam in accord with their normal function. Or one can take them apart to get near to the red laser diode, which shines out through a tiny coated glass window. The beam is in the form of an intensely bright source which is emitted from a microscopic slit-like aperture in one side of the semiconductor chip to give a somewh= at divergent beam with most of the light concentrated along one axis like a line.=20 A small biconvex precision injection-molded plastic lens is seen to be mounted a few millimeters in front of the laser diode window inside the threaded brass case to focus the slit-like divergent beam into a slightly convergent beam which is focused to a bright point at a distance of a number of meters, as is most suitable for laser pointer operation.=20 One can also make one=92s own very short-focus glass bead lens of reasona= ble optical quality by melting a thin strip of window glass with a propane torch, drawing out a thread of glass and remelting it so it fuses into a round bead a few millimeters in diameter on the end of the glass thread. One may chose the best from a number of these, which can all be made in a few minutes. This laser pointer beam is quite suitable, as is, for many uses, and is nicely detectable with the so-called infrared photo transistors sold for = a dollar or so at Radio Shack, used in conjunction with many kinds of op am= p circuits (I especially like the 324 quad bipolar op amps except for exoti= c applications). =20 The laser pointers can be disassembled for further experimentation with t= he help of a vise and a jeweler=92s saw and rebuilt into various instruments. One first unscrews the cap and battery chamber plug to leave a short cylinder that can rest on top of the slightly opened vise. One should the= n saw through inward through the brass toward the central axis of the cylinder and a few millimeters behind the plastic lens. With a little experimentation, one can free up and remove the laser diode and the littl= e attached (it is finely adjusted too--do not try to readjust the tiny pot!= ) circuit board and spring battery contact. One can now carefully saw or grind off the rest of the brass collar to expose the flush surface of the little (near point) light source window inside the gold-plated laser diod= e enclosure. The total dimensions are now only about 1 cm by 2 cm. There is an on-off button that one can tie down with a tight loop of sewing thread tied round the little circuit board, which is probably easier than soldering in a jumper.=20 One could unsolder and reconnect the little circuit board too, to rebuild the laser into small instruments with especially tight spaces, allowing f= or the total size of the light emitter to be only about one centimeter or so= , maximum, in any one dimension; thus allowing for good design flexibility = in various kinds of miniaturized instruments. Potential uses: One of my favorite techniques of instrument design has been to mount smal= l infrared or red light emitters very close to silicon photo transistors an= d to use the intense stream of photons across the gap to detect any minute motion that can be arranged to interrupt this light beam -- such as the motion of the flag on my Hi-Q gravimeter/seismograph.=20 There is no reason not to now apply the same principle to instruments tha= t can use a laser diode for the same purpose, for at least a factor of ten = or probably better, improvement in sensitivity and general performance.=20 For such a purpose, it may sometimes be useful to artificially constrict the laser beam to a narrower well-defined slit at its point of origin by using silicone rubber to glue two little rectangles of aluminum a few millimeters on a side, cut from a drink can, over the exposed laser windo= w, and aligned with the inherent slit-like emission of the laser beam. Thus the straight edges of the aluminum snips are thus perhaps 50 microns apar= t, centered over the laser diode window, and allow a narrow beam of red lase= r light to leak out of the slit that they define over the glass window.=20 Any minute motion of an object with a straight edge, such as the flag on = a seismograph beam mounted very near to the beam, will now choke off or modulate the laser beam and thus generate a powerful signal change in a phototransistor chip mounted a few millimeters away. Many other kinds of instruments like weighing instruments and barometric sensors and vibration sensing instruments can benefit from a small displacement detector with zero back force.=20 As an important example, various kinds of scanning probe microscopes use tiny reflective cantilevers to sense sub-nanometer motion and these can make good use of collimated laser beams. Laser pointers are arranged to focus at a distance some meters in front of the pointer, and since the be= st configuration for scanning microscopes is to have the beam focus to a poi= nt on the tiny cantilever mirror, (these are best made quite optically flat but are typically less than a millimeter across), before it is reflected into a nearby light detector.=20 (I=92m pretty sure I have all the mechanical elements of an amateur-frien= dly scanning vibrating probe microscope hacked now except for the computer interface). It is apparent that an unmodified laser pointer will not be quite optimum for such a purpose. To focus the beam more tightly to a point at a distan= ce of a few centimeters or inches, all that is needed is to mount a small glass supplemental magnifying lens in front of the laser pointer to help the beam converge to a point at the distance needed for instrumental desi= gn purposes. This beam which now converges at a short distance could be used as is to detect the motion of any object or first passed through a pinhol= e or narrow slit to define it a little better.=20 In many or most cases, this use of a supplemental lens is probably a bett= er alternative to taking the laser apart and messing with the optics, which = I typically could not resist doing. --Yours, Roger Baker=20 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Francesco" Subject: R: MERRY CHRISTMAS Date: Wed, 23 Dec 1998 19:50:19 +0100 CAZZOOOOOOOOOO CHE FIGURAAAAAA RIPARO SUBITO....... MI PERDONERAI ????
CAZZOOOOOOOOOO
 
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From: "Francesco" Subject: MERRY CHRISTMAS Date: Wed, 23 Dec 1998 19:51:06 +0100 MERRY CHRISTMAS=20 AND HAPPY NEW YEAR TO ALL =20 =20 ITALIAN EXPERIMENTAL SEISMIC NETWORK - PSN ITALY =20 FRANCESCO GIOVANNI ROBERTO PAOLO ANTONIO CLAUDIO=20 LIBERIO

 
MERRY CHRISTMAS=20
AND = HAPPY NEW=20 YEAR
TO=20 ALL
 
 
ITALIAN EXPERIMENTAL SEISMIC NETWORK  -  PSN=20 ITALY
 
FRANCESCO
   =20 GIOVANNI
       =20 ROBERTO
         &n= bsp; =20 PAOLO
         &n= bsp;     =20 ANTONIO
         &n= bsp;         =20 CLAUDIO
         &n= bsp;           &nb= sp; =20 LIBERIO
 
From: meredith lamb Subject: Seasons Greetings & Reflections Date: Wed, 23 Dec 1998 22:52:23 -0700 Hello all, Looking back on this year in regards to amateur seismology, I think it has been a fantastic year in regards to all aspects. There has been alot of public and behind the scenes activity by alot of people to promote public interest in earthquake science. There would be a long list of people if names were all listed. The list of subjects brought up and discussed have all helped instill some satisfaction of topics understanding. The list of equipment variations and uses seems to be endless; but while there is some disagreement of suitability, it is still very healthy to explore all the presentations. So to all the contributors, in however large or small a form during the year, I thank you for your courage and enthusiasm. I enjoyed it all very much....you are the mainstay and honored as such. Wish everyone the best in their personal lives and hopefully more seismic interests perpetuation in the future. Alot of Thanks, Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Merry Christmas from Dominica Date: Sat, 05 Dec 1998 19:23:42 -0400 To the Public Seismic Network Merry Christmas and Happy New Year from Dominica, in the volcanically shaking Lesser Antilles. from two Dominicans, Wayne Abraham and Dolores St. Jean and two interlopers, Edward Cranswick and Jody Bourgeois _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Bob Fryer Subject: SPAM hijacks PSN message ?? Date: Thu, 24 Dec 1998 16:07:36 -0800 Hello gang, Did anyone else have trouble with David Nelson's message regarding new additions to the PSN map on Tuesday? My copy arrived as part of a SPAM message !! ?? !! It looked like a normal message with the complete headers, but tacked on to the bottom of a SPAM with its own headers. I hesitate to post it until I can be assured that there is no hidden code. I am using Eudora Pro on a MAC G3 266 MHz. Have received no PSN items today. Thanks, Bob ----- earthquake WARNING research ----- --- animals, people, scientific evidence --- --- http://www.teleport.com/~bfryer --- _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: JIm Hannon Subject: Re: SPAM hijacks PSN message ?? Date: Thu, 24 Dec 1998 21:05:01 -0600 Bob Fryer wrote: > Hello gang, > > Did anyone else have trouble with David Nelson's message regarding new > additions to the PSN map on Tuesday? > > My copy arrived as part of a SPAM message !! ?? !! > > It looked like a normal message with the complete headers, but tacked on to > the bottom of a SPAM with its own headers. > > I hesitate to post it until I can be assured that there is no hidden code. > > I am using Eudora Pro on a MAC G3 266 MHz. > > Have received no PSN items today. > > Thanks, > Bob > > ----- earthquake WARNING research ----- > --- animals, people, scientific evidence --- > --- http://www.teleport.com/~bfryer --- > > _____________________________________________________________________ Bob, I receive the PSN list both at home and work and I don't remember seeing any spam either place. But then again I am so used to ignoring spam that I might not have remembered. -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Mark Robinson" Subject: Re: SPAM hijacks PSN message ?? Date: Fri, 25 Dec 1998 16:42:57 +1300 Bob et al Merry Christmas (for those that celebrate it) There was no Spam preface on David's message here, I would suggest that the spam was added somewhere between the PSN list server and yourself - yuck Mark ZL2TOD ----- Original Message ----- From: Bob Fryer To: PSN-L Mailing List Sent: Friday, 25 December 1998 13:07 Subject: SPAM hijacks PSN message ?? >Hello gang, > >Did anyone else have trouble with David Nelson's message regarding new >additions to the PSN map on Tuesday? > >My copy arrived as part of a SPAM message !! ?? !! > >It looked like a normal message with the complete headers, but tacked on to >the bottom of a SPAM with its own headers. > >I hesitate to post it until I can be assured that there is no hidden code. > >I am using Eudora Pro on a MAC G3 266 MHz. > >Have received no PSN items today. > >Thanks, >Bob > >----- earthquake WARNING research ----- >--- animals, people, scientific evidence --- >--- http://www.teleport.com/~bfryer --- > > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "giacomo" Subject: R: Merry Christmas from Dominica Date: Fri, 25 Dec 1998 11:47:03 +0100 Merry christmas and happy new year to Giacomo from Fano (italy) Psn the best in the world to new sismology. -----Messaggio originale----- Da: Wayne Abraham J73WA A: PSN-L Mailing List Data: venerdì 25 dicembre 1998 0.24 Oggetto: Merry Christmas from Dominica >To the Public Seismic Network > >Merry Christmas and Happy New Year from Dominica, in the volcanically >shaking Lesser Antilles. > >from two Dominicans, Wayne Abraham and Dolores St. Jean >and two interlopers, Edward Cranswick and Jody Bourgeois > > >_____________________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email listserver@.............. with the body of the >message: leave PSN-L _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: I got my first earthquake for Christmas ;) Date: Fri, 25 Dec 1998 19:53:06 -0700 It was off the coast of Southern Mexico. I got the same arrival time as the TUC USGS station, within a few seconds. I got 11:37:41 UTC although the signal is so weak it's hard to tell exactly where the signal breaks the noise. It was a 4.4 MB at about 24 degrees distance. It doesn't look too big on TUC's data either so I'm happy. :)) So I gotta sign on the other mailing list to post the event right? ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: I got my first earthquake for Christmas ;) Date: Fri, 25 Dec 1998 20:36:11 -0700 Greg wrote: > It was off the coast of Southern Mexico. I got the same arrival time as > the TUC USGS station, within a few seconds. I got 11:37:41 UTC although > the signal is so weak it's hard to tell exactly where the signal breaks > the noise. It was a 4.4 MB at about 24 degrees distance. It doesn't look > too big on TUC's data either so I'm happy. :)) > > So I gotta sign on the other mailing list to post the event right? > > ,Greg > Greg, Congratulations. The first quake is and should be a thrill to record and see. Its all the more noteable being as its a geophone. I would expect that being close to California and Mexico, you will pick up alot more with time; and the phases will probably be much more distinct the closer they are. Betcha for the all the work and effort you've expended, its perhaps the best kind of christmas present....seeing results of your effort. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: I got my first earthquake for Christmas ;) Date: Fri, 25 Dec 1998 21:09:05 -0700 meredith lamb wrote: > Congratulations. The first quake is and should be a thrill to record > and see. Its all the more noteable being as its a geophone. Thanks. It was pretty nice. It would be easy to dispute as being an earthquake for sure though. There was another identical looking event (TUC data) later in the day that was totally swallowed in the noise on my system. I know that they have thousands of dollars in their system and it's run by a bunch of post doctorate students and professors, so it's not an ideal comparison. There are some really huge mining explosions that I think I should be able to see, but they're either buried in noise or they come from the other side of the mountains and don't make it all the way here? > I would expect that being close to California and Mexico, you will > pick up alot more with time; and the phases will probably be much > more distinct the closer they are. That would be nice. I figured out how to post it to the PSN site. It's there to look at and wonder what the heck it is. ,Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: bc Subject: Newbie Date: Sat, 26 Dec 1998 23:27:49 -0500 Hi all, I'm new to this list and a relative newbie to seismology. I've been interested in the subject for many years but haven't done much with it. Around 1980 I did build an SG seismometer but never calibrated it (did manage to capture an event or 2) and it got put on the back burner when my chart recorder burned out. I planned on some redesigning but never finished the project. So now I'm interested in trying to pick up where I left off 18 years ago. I'd like to build another SG meter but I'm more of a realist these days and know it will take me a while to get one going again. In the meantime I have a couple of inclinometers in my parts draw and was wondering if anyone on this list knows if they are sensitive enough to be of any use as a seismometer. They are Sperry part number 02338-03 with performance specifications as follows: Performance Total range +/- 60 deg. Linear range +/- 45 deg Threshold and resolution .001 deg. Linearity - null - 10 deg. +/- 0.1 deg Null repeatability +/- 0.1 deg. Cross axis error to 25 deg < 1% Time constant 0.3 second Thank you, Bruce _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Success Date: Sun, 27 Dec 1998 22:49:15 -0400 PSN Well, after some hard work and help from alot of you wonderfull people in the PSN and others whom I may never meet in my lifetime, Ed Cranswick, his friend Jody Bourgeous and myself have finally gotten a seismograph station running on Dominica. The station includes a 486 computer, a 3-channel 2 hz geophone which Ed brought us on loan, Larry's 3 channel amplifier board and his 16 bit A/D card donated by Larry Cochrane. Software is SDR 2.5 and Winquake. After working all day Christmas Day getting the computer up and running and installing the seismograph hardware inside the computer, Ed came in on Boxing Day to assist with the software which I had absolutely no understanding of. We got the system up and running in quick time. We did some quick calibration and when we felt comfortable with our accomplishment, we loaded everything on the back seat of my car and drove 30 miles to the south east (near the earthquake zone) to meet with the other members of our amateur radio club who had a minature party all planned. We used the opportunity to demonstrate the new seismic monitoring equipment. Two hours into the party and after Ed amused us many times with his trademark humour, we all gathered around the computer with SDR running and the geophone outside to take a group photograph. Then it happened. At that very moment, we recorded our first earthquake. The room went up in an uproar. We ended the night recording 3 events and a few after-shocks. I have forwarded the first event in 3 files (1 for each channel) to Larry who will look at them and decide if he will post them on his site. As soon as I have a permanent site for the station, I will register the station's location with Dave and have it included on the world-wide map as the first PSN station in the Caribbean. Thank you all of you who sent us equipment and supported us in realizing our goal. I hope we can now, as a club, grow the PSN on Dominica. Most of all, I do hope that our involvement in the PSN will be an inspiration to others who live in earthquake and volcanic hazard zones. Special thanks to Rick Curtis of Geotool, Meredith, Roger, Edward and Larry of the PSN and Jody, Ed's friend. As we say here, Praises to you guys. Wayne - on behalf of the Dominica Amateur Radio Club. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Charlie Rond Subject: Quake just arrived! Date: Sun, 27 Dec 1998 13:57:21 -0600 PSN-Memphis has just picked up a significant quake. Anybody else get it (are you still awake) or know where it is from?? Charlie Rond -\/\--Public Seismic Network-Memphis http://gandlf.ceri.memphis.edu/~rond/psn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "David A. Nelson" Subject: Re: Quake just arrived! Date: Tue, 29 Dec 1998 00:40:07 +1300 At 13:57 27/12/98 -0600, you wrote: >PSN-Memphis has just picked up a significant quake. Anybody else get it >(are you still awake) or know where it is from?? > Charlie Rond Prob the M5.6 in Cuba region 28Dec1998 07:23:37.1 21.1N 74.5W 10 km deep Mb=5.6 CUBA REG look on the Texas recorder on the ASLWWW web site u can see it there Dave Co-ordinator: New Zealand Public Seismic Network Dave A. Nelson ZL4TBN 24 Jensen St., Green Is., Dunedin, South Is.. New Zealand. http://psn.quake.net/dave/home.htm IF there indeed are other parallel universes... I can now rest in the knowledge, that in at least one of them, I am filthy rich and drive a red Ferrari _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Charlie Rond Subject: Re: Quake just arrived! Date: Sun, 27 Dec 1998 17:51:13 -0600 Dave, Thanks for the connection. I'll check that. > Prob the M5.6 in Cuba region >28Dec1998 07:23:37.1 21.1N 74.5W 10 km deep Mb=5.6 CUBA REG > look on the Texas recorder on the ASLWWW web site u can see it there Charlie Rond -\/\--Public Seismic Network-Memphis http://gandlf.ceri.memphis.edu/~rond/psn _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "J. D. Cooley" Subject: Re: Quake just arrived! Date: Mon, 28 Dec 1998 04:55:07 -0800 At 01:57 PM 12/27/98 -0600, you wrote: >PSN-Memphis has just picked up a significant quake. Anybody else get it >(are you still awake) or know where it is from?? > Perhaps this : 28Dec1998 07:23:32.2 19.7N 76.0W 33 MS=5.5 M*GSR CUBA REGION The lat/long would put it between Jamaica and Cuba. "JD" _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: RLLaney@....... Subject: Success Date: Mon, 28 Dec 1998 11:43:53 EST Wayne: Congratulations!!! What a great story. Timing of the group photo couldn't have been better! Bob Laney Herndon, VA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: Success Date: Mon, 28 Dec 1998 11:32:38 -0700 Wayne, Sounds like you people there know how to have fun-ha. Any chance of seeing the group photo sometime? Did you catch the 5.4 Cuba quake? I think Larry Cochranes contribution of the amplifier and A/D card and software is just incredible and wonderfully generious.....wow! Edwards and Jodys help (and entertainment) are also amazing when it comes on their vacations....astounding! Wish you all more success in the coming year, and naturally a reduction in the seismic activity and the worry it causes. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: Newbie Date: Mon, 28 Dec 1998 11:47:54 -0700 bc wrote: > Hi all, > > I'm new to this list and a relative newbie to seismology. I've been > interested in the subject for many years but haven't done much with it. > Around 1980 I did build an SG seismometer but never calibrated it (did > manage to capture an event or 2) and it got put on the back burner when my > chart recorder burned out. I planned on some redesigning but never > finished the project. Bruce, was the S-G built like the original design, and/or did you have other significant variations incorporated into it? > So now I'm interested in trying to pick up where I left off 18 years ago. > I'd like to build another SG meter but I'm more of a realist these days and > know it will take me a while to get one going again. In the meantime I > have a couple of inclinometers in my parts draw and was wondering if anyone > on this list knows if they are sensitive enough to be of any use as a > seismometer. They are Sperry part number 02338-03 with performance > specifications as follows: > > Performance > Total range +/- 60 deg. > Linear range +/- 45 deg > Threshold and resolution .001 deg. > Linearity - null - 10 deg. +/- 0.1 deg > Null repeatability +/- 0.1 deg. > Cross axis error to 25 deg < 1% > Time constant 0.3 second Seems like they would be a interesting addition to the S-G to add to a computer recording scheme. Are you in a seismic zone? Are you planning for an A/D card and the like eventually? > > Thank you, > > Bruce > Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: Re: Success Date: Mon, 28 Dec 1998 16:31:55 -0400 Meredith We try our best to keep our spirits up. I live outside of the seismic zone but my vigourous involvement in getting this network started has helped to calm the nerves of my friends and fellow hams in the earthquake zone. meredith lamb wrote: > Wayne, > > Sounds like you people there know how to have fun-ha. > > Any chance of seeing the group photo sometime? > Ed mentioned that he plans to create a website and put in the photographs they took on Dominica. I guess you will all get a chance to see them. > Did you catch the 5.4 Cuba quake? > I live below sea level and the ground is swampy which makes seismic monitoring virtually impossible. As soon as I understand SDR well, I will place the station near the earthquake zone on a mountainside so I can record as many quakes as possible. Although I had the system on lastnight, I was unable to distinguish between the noise and the events which took place. Imagine a motorcycle triggers the autosave at 10,000 counts. > I think Larry Cochranes contribution of the amplifier and A/D > card and software is just incredible and wonderfully generious.....wow! > Edwards and Jodys help (and entertainment) are also amazing > when it comes on their vacations....astounding! > I think they had fun. They were dragged up to the boiling lake a day after they arrrived.Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: bc Subject: Re: Newbie Date: Mon, 28 Dec 1998 16:42:04 -0500 At 11:47 AM 12/28/98 -0700, you wrote: >bc wrote: > >> Hi all, >> >> I'm new to this list and a relative newbie to seismology. I've been >> interested in the subject for many years but haven't done much with it. >> Around 1980 I did build an SG seismometer but never calibrated it (did >> manage to capture an event or 2) and it got put on the back burner when my >> chart recorder burned out. I planned on some redesigning but never >> finished the project. > >Bruce, was the S-G built like the original design, and/or did you have >other significant variations incorporated into it? I worked primarily from the original '75 design. I use a 1 mhz cmos oscillator instead of building up something discrete. I also put a pot on the input to the first stage to provide a fine balance/zero adjust. What I intended on my redesign was to totally remove the dampening section, digitize the signal as early in the circuit as i could then remove the natural period of the pendulum and do the integration in software. I never got there. The S-G design seems very popular from what I can see and nobody seems to have done that which leads me to belive maybe theres a good reason. > >> So now I'm interested in trying to pick up where I left off 18 years ago. >> I'd like to build another SG meter but I'm more of a realist these days and >> know it will take me a while to get one going again. In the meantime I >> have a couple of inclinometers in my parts draw and was wondering if anyone >> on this list knows if they are sensitive enough to be of any use as a >> seismometer. They are Sperry part number 02338-03 with performance >> specifications as follows: >> >> Performance >> Total range +/- 60 deg. >> Linear range +/- 45 deg >> Threshold and resolution .001 deg. >> Linearity - null - 10 deg. +/- 0.1 deg >> Null repeatability +/- 0.1 deg. >> Cross axis error to 25 deg < 1% >> Time constant 0.3 second > >Seems like they would be a interesting addition to the S-G to >add to a computer recording scheme. Are you in a seismic zone? >Are you planning for an A/D card and the like eventually? > I'm in southeastern Massachusetts. There is a minor fault but I doubt anyone would call it a "seismic zone". When I try this again i will definitely digitize one way or another. I'm a little strapped for interrupts on both computers so I may need to find a less conventional way to do it. Has anyone played with shifting the frequency up to the audio range and using a sound card to digitize the signal? Bruce _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: Success Date: Mon, 28 Dec 1998 19:53:38 -0800 I'm forwarding this to the list for Edward Cranswick. -Larry Wayne- The credit for the working seismograph system goes to you because we brought a bunch of different pieces (with which Edward was totally unfamiliar), and you put them together in a 486 box and made them work. We've been very impressed with the Dominica Amateur Radio Club for all their technical expertise, social mindedness, dedication, and warm hospitality. To help you all tune in to the Earth as well as the air waves which you already receive is a great example of the PSN connecting the community to the ground on which they live. We're having a fabulous Christmas and holiday in Dominica, and the tremors we measured (and Andre confirmed by phone the first was felt by a friend in Point Michel) was the best Christmas present we could get. We appreciate the hospitality of Hetty and Charlie Papa Lima (both hams, also), who hosted the party at their lovely home up in the hills above Roseau. We also are very grateful to Clem James (president of the radio club) for taking time in his busy schedule to spend a day taking us to Boiling Lake where we could see with our own eyes the Earth hot and alive. Tonight we are going down to Andre and Joyce's (both members of the club) in Soufriere, near the heart of the seismic activity, and the most recent volcanic edifices. Andre and his family operate the Forest Bistro in the beautiful Soufriere Valley (until the next pyroclastic flow); they are also the site of an SRU seismic station, where Andre used to change the paper records, and see the events himself, but now the signal is sent straight to Trinidad. All they can do now is feel the Earth move; their daughters keep a journal of felt events. So tonight we will sleep in Soufriere and maybe we'll feel the Earth move (and maybe Wayne will record it in Portsmouth with the new PSN/Dominica Amateur Radio Club seismograph). We'll post another report/account when we return to the States (on New Years). This is probably our sign-off from Dominica. Congratulations to Wayne and the Club, thanks to all the PSN who contributed equipment, advice and support, and Happy New Year to all! Jody Bourgeois and Edward Cranswick ---Wayne Abraham J73WA wrote: > > PSN > > Well, after some hard work and help from alot of you wonderfull people > in the PSN and others whom I may never meet in my lifetime, Ed > Cranswick, his friend Jody Bourgeous and myself have finally gotten a > seismograph station running on Dominica. The station includes a 486 > computer, a 3-channel 2 hz geophone which Ed brought us on loan, Larry's > 3 channel amplifier board and his 16 bit A/D card donated by Larry > Cochrane. Software is SDR 2.5 and Winquake. > > After working all day Christmas Day getting the computer up and running > and installing the seismograph hardware inside the computer, Ed came in > on Boxing Day to assist with the software which I had absolutely no > understanding of. We got the system up and running in quick time. We did > some quick calibration and when we felt comfortable with our > accomplishment, we loaded everything on the back seat of my car and > drove 30 miles to the south east (near the earthquake zone) to meet with > the other members of our amateur radio club who had a minature party all > planned. We used the opportunity to demonstrate the new seismic > monitoring equipment. > > Two hours into the party and after Ed amused us many times with his > trademark humour, we all gathered around the computer with SDR running > and the geophone outside to take a group photograph. Then it happened. > At that very moment, we recorded our first earthquake. The room went up > in an uproar. We ended the night recording 3 events and a few > after-shocks. > > I have forwarded the first event in 3 files (1 for each channel) to > Larry who will look at them and decide if he will post them on his site. > As soon as I have a permanent site for the station, I will register the > station's location with Dave and have it included on the world-wide map > as the first PSN station in the Caribbean. > > Thank you all of you who sent us equipment and supported us in realizing > our goal. I hope we can now, as a club, grow the PSN on Dominica. Most > of all, I do hope that our involvement in the PSN will be an inspiration > to others who live in earthquake and volcanic hazard zones. > > Special thanks to Rick Curtis of Geotool, Meredith, Roger, Edward and > Larry of the PSN and Jody, Ed's friend. As we say here, Praises to you > guys. > > Wayne - on behalf of the Dominica Amateur Radio Club. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Capacitors Date: Mon, 28 Dec 1998 21:48:21 -0800 Hi All Well I am pondering types of caps to use in circuits again. I think this question came up before but I can't seem to find it. I can't seem to decide which cap variety is best for each application. For small value caps I assume Mylar are best. For medium sized (0.001-2u) I am not sure which to use for filtering or bypass(polyester,polypropylene,metalized film,or ceramic)? For larger back to back polarized caps are tantalums better the aluminum electrolytic ? For one to two circuits the price for me is not as important as the quality and life of the components. Regards Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Fred Subject: Re: Capacitors Date: Mon, 28 Dec 1998 23:32:17 -0800 Barry, For small value caps, Mylar is not always the best. A typical Mylar cap can have a TC (Temp coefficient) of several hundred ppM (parts per million) For high accuracy applications I suggest ceramic NPO or COG (+/-30ppM) types. Even better are glass, or teflon but these are harder to find and more expensive. A typical Mylar cap can have a TC (Temp coefficient) of several hundred ppM (parts per million) Silver mica's below 10,000pF are approx 0 - +70ppM/deg C with good voltage withstand (500VDC) Mylar specs are similar to polyester or metalized types. For supply bypassing, a cap with low ESR (Equivelent series resistance) is prefferable. Check out the "Mini-box" series from Digikey. Nice specs in a small package. For small ceramic caps try the Kemet "Gold max" series. They are available in NPO/COG up to 1uF. Fred _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Brett Nordgren Subject: Re: Capacitors Date: Tue, 29 Dec 1998 08:18:54 -0500 Barry, Have some thoughts on one part of your question. I spent some time looking at capacitors for long time-constant (>100 second) filters and found some good references that also cover other capacitor applications. http://www.capacitors.com/consider/consider.htm#realworld is a good general reference. http://www.penton.com/ed/Pages/magpages/may1398/pease/0513bp1.htm or http://www.national.com/rap/Application/0,1127,28,00.html talk about "soakage" -- one of the problems you may run into if you're trying to make a linear (low distortion) long t-c filter. http://www.national.com/rap/Story/Index/0,1009,0,00.html more Bob Pease columns - includes info on long t-c integrators. http://www.faradnet.com/ Is a home page that links to many good capacitor references. Tantalums are, in general, better that aluminum electrolytics, at least if you go by their spec's; though non-electrolytics have even better specs. I'm coming to the conclusion that for long time-constant integrators and differentiators, the polypropylene caps are probably going to be the best, if you don't mind their size and cost vs electrolytics. In these applications, their internal time-constant (my term) which is the t-c of their self discharge with no load attached, is an important characteristic. Electrolytics are spec'd at a few tens or hundreds of seconds. Polyester (mylar) and Polycarbonates are a few hundreds or thousands of seconds. Polypropylenes are in the range of tens or hundreds of thousands of seconds, and if cost is no object, Teflon dielectric caps can get you up to a million seconds. Polystyrenes are only a little poorer than Polypropylenes, but they don't seem to be available in sufficiently large values. These numbers are highly dependent on temperature, rapidly getting worse (shorter) as the temp goes up. In general, I'd like to see an internal time-constant that's at a very minimum, 10x the t-c of the circuit I'm making. I've seen Polypropylenes in values up to 50 uf or so, though they're big (~1/3 cubic inch/uf) and somewhat expensive. Electrical noise is another issue that's directly related to capacitor leakage. The longer t-c caps have less leakage, which means less low frequency noise. Sometime, I hope to get an electrometer op-amp and set up to try to get some real world measurements, but I'm afraid it won't be soon. Hope that helps. Brett At 09:48 PM 12/28/98 -0800, you wrote: >Hi All > Well I am pondering types of caps to use in circuits again. >Regards > >Barry > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: The price of a real seismometer Date: Tue, 29 Dec 1998 18:45:31 +0000 As you might remember I have a GeoSpace GS-11D 4.5 HZ geophone. I'm starting to realize that I'm getting nothing but noise. No mining explosions or earthquakes. Hey, it was only $60. So I was wondering if someone could give me some idea of what the next step up is. I can either dump about $100 dollars into my Lehman parts and have it sit directly behind my chair and have it go off constantly or get a low end seismometer / high end geophone for replacing the 4.5 Hz one. I kinda want a vertical first. So I need to know some people's opinions of their instruments or ones that they have worked with before and prices. It will be a while before I buy one, but that's OK I guess. If I have to save for 2 years it's no big deal. I can sell one of my bikes and almost get an L-22. I want some nice data at the end though. I've noticed that some of the instruments require input power. So what comes out the other end? 30V at 1 AMP? Probably wouldn't work with Larry's amp and ADC card. I've found out this so far: Mark Products L-4 1 or 2 Hz vertical is about $1000 L-22 2 Hz vertical is about $450 Guralp PEPP instrument is about $1500 (connects to serial port + 20-24 bit data) other instruments used by USGS according to the web page Streikesen STS-1 (3 component) very nice data price is probably > $3000 other instruments? Teledyne Brown (Geotech) S-13J 1 Hz about $1000-1500 KS-54000 (3 component) very nice data about $75000! Sprengnether S3000 ? WB2000 ? GeoSpace HS-10 .5, 1 and 2 Hz models about $1000+ Larry, if you're reading this you can delete my file from your server. It's almost certainly not an event. 98?????.GZ1 Thanks for any information, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Fred Subject: Re: The price of a real seismometer Date: Tue, 29 Dec 1998 11:00:51 -0800 Greg, What kind of "Noise" are you getting. i.e. 60HZ, random HF, cars and people... Perhaps the noise is in your connection scheme. Is your sensor in the ground ? With a 4.5HZ sensor, and a good amp, you should have no problem picking up local activity. I had the same problem with garbage untill I made a few simple changes to my amp configuration. I went to twisted pair (TP) with a single point ground at the amp side. I get less 60hz pickup with TP. I placed my sensor in a 1 pint paint can filled with dry sand. the can is not electricly tied to either output of the sensor. Hope this helps Fred _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Wayne Abraham J73WA Subject: To Ham Radio Operators Date: Tue, 29 Dec 1998 15:15:41 -0400 PSN As you may all know, we have just gotten our seismic station setup on Dominica. Because of the distance I live from the earthquake zone and the unsuitability of my home as a seismometer site, I am looking for an alternative to getting my daily data for processing. My idea is to run a memory resident packet program on the SDR computer before running SDR. The program would work in the same manner as its telephone counterpart PCANYWHERE. This program would then give me remote access to the SDR computer via packet radio. Does anyone of you ham radio operators on this list know of such a program? Your input would be greatly appreciated. Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Subject: Re: The price of a real seismometer Date: Tue, 29 Dec 1998 19:29:07 +0000 Fred wrote: > What kind of "Noise" are you getting. i.e. 60HZ, random HF, cars and > people... Perhaps the noise is in your connection scheme. Is your I get noise from big garbage trucks and trains. At night it's super quiet so I doubt it's the wires or connections. Still no good signal at night though. I get noise from my internal SCSI CD-ROM drive in a separate computer. I get noise from me walking around. I've seen the cat jump off of a chair 10+ feet from the instrument. > sensor in the ground ? With a 4.5HZ sensor, and a good amp, you > should have no problem picking up local activity. I had the same It's outside about 2-3 feet down buried in the sand. It's inside a PVC pipe case that I made with desiccant and some rocks for weight. Well there really isn't any local activity. There's regional earthquake activity. I'm mainly interested in teleseismic anyway. That 6.0 from the Philippines went right by me and on to lots of other instruments. There are at least 5 mines around Tucson and at least some of the explosions show up on the SP data at the TUC USGS sensor. I think they would prefer to not see the explosions. Either way for me, as long as I get some earthquakes. > I went to twisted pair (TP) with a single point ground at the amp side. I'll have to try that yet. I have a ground wire but it's not connected to anything right now. Thanks, Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: JIm Hannon Subject: Re: To Ham Radio Operators Date: Tue, 29 Dec 1998 13:58:07 -0600 Wayne Abraham J73WA wrote: > PSN > > As you may all know, we have just gotten our seismic station setup on > Dominica. Because of the distance I live from the earthquake zone and > the unsuitability of my home as a seismometer site, I am looking for an > alternative to getting my daily data for processing. > > My idea is to run a memory resident packet program on the SDR computer > before running SDR. The program would work in the same manner as its > telephone counterpart PCANYWHERE. This program would then give me remote > access to the SDR computer via packet radio. > > Does anyone of you ham radio operators on this list know of such a > program? Your input would be greatly appreciated. > > Wayne > Wayne, Right now I am busy writing some software to send some ELF receiver data from a remotely located sensor via amateur packet radio. The approach we are using is to have the remote system perodically send a data file using the YAPP packet protocol. This is another approach to the communication problem. I think for your situation the approach you have outlined may be better. I haven't looked into it too closely but there are a number of packet radio terminal programs that can be used like a BBS. I think that you can log onto the remote BBS via packet radio and request directory information and files be transferred. The big problem as I see it is going to be getting SDR to work in conjunction with the packet radio program. I will do some more reading and post some more ideas later. -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: wb6nvo@............. (Jim Skinner) Subject: Re: The price of a real seismometer Date: Tue, 29 Dec 1998 13:45:32 -0700 (MST) - Greg - I have used GS-11's for about 10 years with good success. You may have something hooked up wrong in your system somewhere. Please get ahold of me and I will assist you in getting it straightened out. I'm in the Mission Hills area (by San Xaviar Mission) and can easily pick up mine blasts and stuff in the Gulf with my setup. Even get some good traces from California stuff. - Jim Skinner - 520-883-7237 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: David Josephson Subject: Re: To Ham Radio Operators Date: Tue, 29 Dec 1998 13:20:14 -0800 (PST) > My idea is to run a memory resident packet program on the SDR computer > before running SDR. The program would work in the same manner as its > telephone counterpart PCANYWHERE. This program would then give me remote > access to the SDR computer via packet radio. > > Does anyone of you ham radio operators on this list know of such a > program? Your input would be greatly appreciated. Why not just run J-NOS and run TCP/IP over packet? There are lots of versions of this, docs etc at ftp://ftp.ucsd.edu/hamradio/packet/tcpip/ -- David Josephson / Josephson Engineering / San Jose CA / david@............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Larry Cochrane Subject: Re: Dominica Earthquake files Date: Tue, 29 Dec 1998 14:39:10 -0800 PSN, I placed the files that Wayne sent me on my system. I renamed the files to 981227A.DM1, 981227A.DM2 and 981227A.DM3. Sorry for the delay. I've been sick with the flu.... -Larry Cochrane Redwood City, PSN At 10:52 PM 12/27/98 -0400, Wayne wrote: >Larry > >Here are 3 earthquake data files. These files are the 3 channels of our >first quake recorded on Dominica. We are using a 3 channel 2 hz geophone >which Ed brought us on loan from the USGS, your 3 channel amplifier, 16 >bit A/D Converter and SDR. The channels identification and station >location were not properly setup as we were demonstrating the system to >the club members when the event took place. > >The correct orientation for the channels are: >Ch 1 - Vertical >Ch 2 - North/South >Ch 3 - East/West > >The location of the station was Wotten Waven, Dominica. Location >approximately 15.31N, 61.35W. > >Please post them if you think that they are worth posting. > >Thanks, >Wayne _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: ralvarez@........ (Raul Alvarez) Subject: Question Date: Tue, 29 Dec 1998 17:59:13 -0700 (MST) Hi all, This is not exactly a sesimic question, but anyone building neat stuff like seismos, probably will use a milling machine at one time or another. I am searching for a used, manual Bridgeport vertical mill, and am curious what the going price for such a beast is? Any ideas??? Raul ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: David Josephson Subject: Re: Question Date: Tue, 29 Dec 1998 17:06:55 -0800 (PST) > This is not exactly a sesimic question, but anyone building neat stuff > like seismos, probably will use a milling machine at one time or another. > I am searching for a used, manual Bridgeport vertical mill, and am > curious what the going price for such a beast is? Between $2500 and $5000 depending on condition, tooling, age etc. Be sure you have someone knowledgable thorougly inspect the ways, quill et. -- David Josephson / Josephson Engineering / San Jose CA / david@............. _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: JIm Hannon Subject: Re: Question Date: Tue, 29 Dec 1998 19:09:42 -0600 Raul Alvarez wrote: > Hi all, > > This is not exactly a sesimic question, but anyone building neat stuff > like seismos, probably will use a milling machine at one time or another. > I am searching for a used, manual Bridgeport vertical mill, and am > curious what the going price for such a beast is? > Any ideas??? > > Raul Raul, Have a look at http://www.mermac.com/machines.html for some ideas. I have a import milling machine purchased new for $900. -- Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N 91,39.26W WB0TXL _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Doug Niessen Subject: Re: Question Date: Tue, 29 Dec 1998 17:04:45 -0800 Raul, A friend here in Sacramento CA just put an old 3 phase Bridgeport with a 42in.table up for sale at $1500.00. It was gone in a day. Cheers Doug _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Re: Question Date: Tue, 29 Dec 1998 17:36:35 -0800 Raul -- I've looked at these from time to time, but not purchased one yet. They seem to run anywhere from $800 & up. You can get a decent one with a modest amount of tooling in Southern California for about $1500 or less if you look around. You may already know this, but some things to look for: Make sure it takes R8 collets, not the old Brown & Sharpe ones that you can't get any more. Look at how worn out the dovetails are. You can always adjust them for the ends, but it gets pretty aggrivating if you can't mill a surface without a rise in the center. Are the bearings in the head good? Unless you have 3-phase power, you will probably have to put a different motor on it. Look in the newspaper classifieds under "Machinery & Industrial" or something like that. There are often companies that will let one go pretty cheap if you do the moving. There are also surplus dealers but they usually want more $. Karl Cunningham La Mesa, CA. PSN station #40 karlc@....... At 05:59 PM 12/29/98 -0700, you wrote: >Hi all, > >This is not exactly a sesimic question, but anyone building neat stuff >like seismos, probably will use a milling machine at one time or another. >I am searching for a used, manual Bridgeport vertical mill, and am >curious what the going price for such a beast is? >Any ideas??? _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: S-T Morrissey Subject: geophone sensitivity Date: Tue, 29 Dec 1998 19:46:00 -0600 (CST) Regarding the anticipated sensitivity of a seismic station: Naturally, there are two ranges of information desired from a seismic station: local activity and teleseismic (or worldwide) activity. Because of the dispersion of waves as they travel through the earth, the more distant a station is the more the frequency of the arriving wave will be reduced, (as well as the energy). Thus even though the quake in your back yard in Sunnyvale might have frequencies in excess of 100 hz, 100 km away they would have spread down to only several tens of hertz, and I would be lucky to sense 1 hz 2000 km away, and the Italian station would only see the 10-second surface waves. (this is a real simplification: there are many other considerations about the earthquake source that also control the frequency content, such as fault length and stress drop). So an empirical determination of the sensitivity of yourt station simply depends on what you record. And for reference, I can suggest what I sense with the STM broadband here at the farm: being a broadband, it has the response of a geophone and an LP seismometer all in one. The sensor is about 10 meters from a busy street. So I record all the passing traffic, especially trucks. To keep these from trashing the record, I HEAVILY (like with two amps with 2 corners each) low pass filter at about 1 hz. This can also be done with a small geophone: filter out the traffic and the cat (I have dogs for the same test), and increase the gain to bring up more of the 1 hz data. The traffic will still be there, but at 1/100 of what an open high frequency response will show. And the local quakes will also show quite well. This low pass filtering and increasing the gain of a geophone amplifier can be pushed to the point where the amplifier noise dominates the record and non-linearities of the filter can be seen. Other limitations of the geophone, such as the very reduced mass, also limit the response. (there is a graph of the response of my drum recorder on my web site at: http://www.eas.slu.edu/People/STMorrissey/ stmfigs.html " The STM-8 Seis: Figures, Schematics, Drawings" For teleseismic sensitivity, the 6-second storm microseisms are a good indicator of long period sensitivity. Teleseismic waves have periods of 1 to 20 seconds (common surface waves) to several hundred seconds that the broadband sensor will see. If I see 6-second waves (today running at a moderate level of 3-5mv: they have been in excess of 20mv last week), I know the instrument is operating and will record almost anything greater than a M=5.5 to 6.0. (For my monitor drum, I use a 6-second passive notch filter to reduce them by 1/100 so as to improve the "cosmetic" quality of the record.) So, in my opinion, if you are not seeing a consistent background of 6-second noise (10 waves/minute), you will probably not see much of teleseismic activity (unless, of course, you have a very low pass filter that removes them). By the way, I have never been able to get much more than a 1-second response from a 4.5hz geophone. It is not a teleseismic instrument. Regards, Sean=Thomas _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: barry lotz Subject: Re: The price of a real seismometer Date: Tue, 29 Dec 1998 19:54:03 -0800 Hi Greg I have the $9 Geophone version (10 hz?) that I bought a few months ago .. I also don't get to much from beyond about 100-200k distance. I have build several Lehmans and two STM-8 verticals. I don't think the cost was as much a problem for me as the time. Some scrap metal, magnet wire,misc screws, tapping knife. Maybe the cost adds up but I might guess the hardware would be less than $50 each. The circuits prior to Larry's board aren't to complicated. I have used solderless breadboards for years. They are starting to screw up now though due to use. I am starting to use Radio Shack solder boards that have the same pattern as the solderless breadboards. I like them better than wire wrapping. If I were starting I would make a Lehman and put in a enclosure(wind protection)& as far away from foottraffic as possible (I get blips when I stomp my foot and the Lehman is in my garage about 40' away.). Find a good surplus store for scrap metal and electronic components was a help to me. I hope this helps a little. Barry Greg wrote: > As you might remember I have a GeoSpace GS-11D 4.5 HZ geophone. I'm > starting to realize that I'm getting nothing but noise. No mining > explosions or earthquakes. Hey, it was only $60. So I was wondering if > someone could give me some idea of what the next step up is. I can > either dump about $100 dollars into my Lehman parts and have it sit > directly behind my chair and have it go off constantly or get a low end > seismometer / high end geophone for replacing the 4.5 Hz one. I kinda > want a vertical first. So I need to know some people's opinions of their > instruments or ones that they have worked with before and prices. It > will be a while before I buy one, but that's OK I guess. If I have to > save for 2 years it's no big deal. I can sell one of my bikes and almost > get an L-22. I want some nice data at the end though. > > I've noticed that some of the instruments require input power. So what > comes out the other end? 30V at 1 AMP? Probably wouldn't work with > Larry's amp and ADC card. > > I've found out this so far: > > Mark Products > L-4 1 or 2 Hz vertical is about $1000 > L-22 2 Hz vertical is about $450 > > Guralp > PEPP instrument is about $1500 (connects to serial port + 20-24 bit > data) > other instruments used by USGS according to the web page > > Streikesen > STS-1 (3 component) very nice data price is probably > $3000 > other instruments? > > Teledyne Brown (Geotech) > S-13J 1 Hz about $1000-1500 > KS-54000 (3 component) very nice data about $75000! > > Sprengnether > S3000 ? > WB2000 ? > > GeoSpace > HS-10 .5, 1 and 2 Hz models about $1000+ > > Larry, if you're reading this you can delete my file from your server. > It's almost certainly not an event. 98?????.GZ1 > > Thanks for any information, > Greg _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Walt Williams" Subject: PSN-L: California Event Date: Tue, 29 Dec 1998 19:42:36 -0800 All, At 13:54 (PST) Canoga Park, Ca., USA my Lehman instrument registered an event. Unfortunately I am modifying/testing new software to include another channel of information from my geophones and it was not in record mode. Walt Williams, 98.12.29 PSN Stn 63 LAT./LONG.: 34.21967N 118.61106W http://psn.quake.net/dave/people1.htm#p62 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Karl Cunningham Subject: Re: PSN-L: California Event Date: Tue, 29 Dec 1998 23:00:48 -0800 Hi Walt -- Your event was probably: 98/12/29 21:51:10 34.21N 118.63W 3.1 2.6ML A 2 mi. WNW of Canoga Park, CA Couldn't get much closer. Karl Cunningham La Mesa, CA. PSN Station #40 karlc@....... At 07:42 PM 12/29/98 -0800, you wrote: >All, > >At 13:54 (PST) Canoga Park, Ca., USA >my Lehman instrument registered an event. Unfortunately I am >modifying/testing new software to include another channel of >information from my geophones and it was not in record mode. > >Walt Williams, 98.12.29 >PSN Stn 63 >LAT./LONG.: 34.21967N 118.61106W >http://psn.quake.net/dave/people1.htm#p62 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: RLLaney@....... Subject: Lehmans and cold weather Date: Wed, 30 Dec 1998 16:31:07 EST I would appreciate comments from anyone in the PSN group who is operating a Lehman in cold weather, has done so in the past or otherwise has knowledge of operation of seismographs in cold weather. A Lehman and SG sensor are on the floor of my garage. Both sensors have an inner cover made of wall paneling and plexiglas. An outer cover is made of 2-inch styrofoam. As night-time temperatures fall through about 40 degrees, the trace of the Lehman begins to have wide swings in amplitude. The more the temperature lowers the wider the swings in amplitude. The SG is largely unaffected. I thought for a time that the swings were irregular, but it turns out that the noise is cyclical and has a period of about 20 seconds. I installed a 60-watt light bulb in the top of the inner cover of the Lehman. With the bulb on, the temperature in the inner cover about half way down from the top at the end of the box stays in the range of 65 to 70 degrees (when the garage air temperature is in the 30's), and the noise is almost eliminated. It is still there, but would not greatly interfere with receiving a teleseismic event as it would without the light bulb being on. The system may get a greater test in the next couple of days because we may have some of the coldest weather so far this winter (in the teens at night). I had always expected from what I had read that cold temperatures would cause a lot of spikes in the traces because of sudden expansion/contraction of the house, floor, etc. Some spikes are present on the traces of both sensors during cold weather, but not nearly as much as I would have expected. Also, probably not all of the spikes are caused by temperature changes. In addition, I am puzzled by the cyclical nature of the temperature noise. One evening some fairly strong 5-6-second period microseisms were present (with the light bulb on). When I looked at the record with WinQuake, the microseisms were over printed on a 20-second wave of low amplitude. Anyway, I would appreciate hearing comments on this issue. Thanks. Bob Laney Herndon, VA _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: ralvarez@........ (Raul Alvarez) Subject: Re: Question Date: Wed, 30 Dec 1998 17:32:56 -0700 (MST) Hello again, Thanks for the many replies on the mill question. It confirmed my guess of price range. Going to an auction soon and will have a price range to stay with. Raul ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "My dreams are the seeds of my reality, nurtured in the womb of my soul" RJA, 1985 Raul J. Alvarez La Estrellita Observatory Bellvue, Colorado e-mail ralvarez@........ homepage www.frii.com/~ralvarez "The Renaissance Experimenter" doing research in: Radio and Optical Astronomy, Seismology, Weather, Computers, Instrumentation and Neat Stuff! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Walt Williams" Subject: PSN-L: SETI - Life In Extreme Enviroments - Announcement Date: Wed, 30 Dec 1998 17:23:44 -0800 All, This is slightly off topic, it is cross posted from the SETI League list. FYI. Walt Williams, 98.12.30 PSN Stn 63 dfheli@.............. ===================================================== ------- Forwarded Message Follows ------- Date: Wed, 30 Dec 1998 20:25:37 -0500 To: seti@........ europa@.............. From: Larry Klaes Subject: SETI [ASTRO] Life In Extreme Enviroments - Announcement Of Opportunity Cc: carlsagan@....................... skingsle@.......................... >X-Authentication-Warning: brickbat12.mindspring.com: majordom set sender to owner-astro using -f >Date: Thu, 31 Dec 1998 0:16:26 GMT >From: Ron Baalke >To: astro@.................... >Subject: [ASTRO] Life In Extreme Enviroments - Announcement Of Opportunity >Sender: owner-astro@......................... >Reply-To: Ron Baalke > >http://www.nsf.gov/cgi-bin/getpub?nsf9943 > > LIFE IN EXTREME ENVIRONMENTS > (LExEn) > > Announcement of Opportunity and > Special Competition for FY 1999 > > DIRECTORATE FOR BIOLOGICAL SCIENCES > DIRECTORATE FOR ENGINEERING > DIRECTORATE FOR GEOSCIENCES > DIRECTORATE FOR MATHEMATICAL AND PHYSICAL SCIENCES > OFFICE OF POLAR PROGRAMS > OFFICE OF SPACE SCIENCE, NASA > > DEADLINE DATE: March 5, 1999 > > NATIONAL SCIENCE FOUNDATION > NATIONAL AERONAUTICS AND SPACE ADMINISTRATION > > >Introduction > >Life flourishes on Earth in an incredibly wide range of environments, from >high-salt deserts to volcanoes to polar ice. These environments may be >analogous to the harsh conditions that exist now, or have existed, on other >planets. The study of microbial life forms and the extreme environments in >which they exist here on Earth can provide important new insights into how >organisms form and adapt to diverse environments. This knowledge will >provide the basis for detecting and understanding the life forms that may >exist beyond our own planet, and for developing useful new products and >processes. > >The Directorates for Biological Sciences (BIO), Engineering (ENG), >Geosciences (GEO), Mathematical and Physical Sciences (MPS), and the Office >of Polar Programs (OPP) of the National Science Foundation (NSF) announce an >opportunity to enhance knowledge about "Life in Extreme Environments" >(LExEn) through highly interdisciplinary, integrated research activities. >Two new areas of emphasis are added to the fiscal year 1999 competition: a >particular focus is placed upon the development of methods and capabilities >to facilitate LExEn research. Secondly, a new effort in cooperation with the >National Aeronautic and Space Administration (NASA) is described to begin >long term studies over decadal time scales at representative examples of >significant extreme environments. > > >FY99 Special Competition > >Proposals in response to the announcement of Opportunity must be received at >NSF no later than close of business on March 5, 1999. Review and processing >of proposals require approximately 6 months. > >For the purposes of this announcement "extreme" refers to environments found >today on Earth which have attributes that are similar to those that exist >now or that may have existed in the past on other planetary bodies, or to >those that are postulated to have existed on Earth at the dawn of life. Such >environments might include those associated with hydrothermal systems, high >radiation fields, sea ice and ice sheets, anoxic habitats, hypersaline >lakes, high altitude or polar deserts, or man-made environments such as >those created for industrial processes. > >Because of the importance of the interactions between microbial organisms >and the extreme environments within which they exist, studies are >particularly encouraged that crossdisciplinary boundaries and foster >collaborative investigations. > >Funds available from both NSF and NASA to support projects under this >Special Competition are expected to total approximately $7 million. >Approximately 20 awards are anticipated in fiscal year 1999 depending on the >quality of the proposals received and the availability of funds. > >In order to provide specific guidance concerning the content of proposals >suitable for submission to this competition, this announcement of >opportunity is presented in three separate but closely related sections: > >* The LExEn Interdisciplinary Research Program >* Methods and Capabilities for LExEn Research >* LExEn Sites for Long-term Interdisciplinary Studies (LSLIS) > >However, the three areas that are described in the present Announcement of >Opportunity comprise a single Special Competition, and all proposals >received in response to this Announcement will be reviewed together. The >three components of the fiscal year 1999 competition are described in detail >below: > > > * LExEn Interdisciplinary Research Program > >The LExEn interdisciplinary research program will explore the relationships >between microbial organisms and the environments within which they exist, >with a strong emphasis upon those life-supporting environments that exist >near the extremes of planetary conditions. In addition, the LExEn program >will explore planetary environments in our own solar system and beyond to >help identify possible sites for life elsewhere. > >The scope of the LExEn Interdisciplinary research program is described in >terms of three broad themes below. Strong emphasis will be given to the >support of interdisciplinary research proposals. For this component of the >LExEn competition, research projects of 2-5 years duration are appropriate. > > >Microbial Systems: >Research is required to enhance understanding of the microbial systems on >Earth, particularly with respect to their diversity and the mechanisms that >allow microbes to survive and alter extreme environments. Examples of >relevant topics include: > > * studies to discover, quantify, culture, preserve, and analyze > microorganisms from extreme environments; > * research on the diversity, ecology, physiology, biochemistry, genetics > and evolutionary history of microbes from extreme environments within > the context of the diversity of conditions found in those environments > and/or their possible utility in biotechnology; > * the identification of unusual or even unique chemical compounds and > their specific roles in survival strategies; and > * paleobiological studies of microbial life on Earth, including efforts > which improve understanding of the products of life that are preserved > in the geological record. > >Extreme Environments on Earth: >Because of the importance of the interactions between living organisms and >their habitats, it is necessary to achieve improved understanding of >present-day or past extreme environments that support or have supported >life. Examples of relevant topics include: > > * studies designed to discover, explore and fully characterize > significant examples of extreme environments; and > * field, laboratory, and theoretical studies designed to understand the > active physical, chemical, biological, and geological processes that > determine the characteristics of present-day or past extreme > environments on Earth and which result in their ability to support > unusual microbial life. > >Planetary Environments: >In order to provide insights into the possibility of life beyond our own >planet, research is also needed to characterize the environments of planets >in the solar system and beyond and to understand the commonalities of their >formation and evolution. Examples of relevant topics include: > > * studies of the formation of Earth, other planets and their satellites; > * remote sensing of planets and their atmospheres; > * studies of interstellar grains and meteorites to establish criteria for > the presence of biogenic substances; > * studies of interstellar and cometary chemistry, particularly of > biologically relevant molecules; > * the relationship between interstellar organic molecules and the origin > of life; and > * research on the biogeochemical effects of microbes on their > environments on Earth to better design tests for life on other planets. > > * Methods and Capabilities for LExEn Research > >In several areas of LExEn research, progress is limited by lack of effective >methods, capabilities, or technologies. To address this issue, this second >component of the fiscal year 1999 LExEn program is targeted at the support >of research projects to develop or apply one or more of the following: > > * methods to isolate and culture microbes found in extreme environments; > * methods to study these microbes in their natural habitats and to > describe their adaptive strategies from the molecular to the ecological > level; > * technologies for non-contaminating sample recovery; > * sensors and sensing techniques to probe extreme environments on Earth > or other planets; > * methods to study ancient microbial life and paleo-environmental > conditions on Earth; and > * methods to investigate the potential for habitable environments on > other planets (including theory and modeling). > > >For this component of the LExEn competition, research projects of 2-5 years >duration are appropriate. Proposals that are predominantly for the purchase >of available equipment or instrumentation are not appropriate for this >competition. > > * LExEn Sites for Long-term Interdisciplinary Studies (LSLIS) > >Because of the dynamic nature of many of the processes that control the >interactions of microorganisms with their environments, substantial insights >can be gained by programs of sustained observation and sampling targeted at >understanding the biological, chemical, and physical variability of these >systems. Therefore this component of the LExEn competition, to be supported >jointly by NSF and NASA if suitable proposals are received, will establish a >small number of research programs targeted at the study of representative >examples of extreme environments and the life they support. NASA?s interest >in extreme environments is related to the broader study of life in the >Universe (see http://astrobiology.arc.nasa.gov/). It is intended that >through this competition a small number of diverse study sites will be >selected that will be the target of multidisciplinary observation and >research for at least a 5-10 year period. The following paragraphs describe >desirable characteristics of LSLIS proposals, though not all are necessarily >required: > > * A well-designed program of measurement, observation, and sampling > focused upon a site that is representative of a class of extreme > environments, with the objective of gaining fundamental new > understanding of the biological, chemical, and physical > characteristics, variability, and processes. > * A research plan that balances exploratory and hypothesis-driven > investigative strategies and that is cognizant of the need to modify > and shape the data-collection approaches as insight is gained > concerning the controlling processes. > * An effective research program that combines studies of the natural > ecosystem with the development of new technologies and missions for the > exploration of extreme environments in our Solar System. > * A multidisciplinary team of investigators with an integrated > investigative strategy that balances appropriately studies of life with > studies of the characteristics of the supporting environment. > * An education component that stresses the entrainment of graduate > students in highly interdisciplinary research activities. > * A demonstrated interest in the application and continued development of > improved instrumentation and technology. > * An innovative plan for the archiving and broad dissemination of the > collected samples and data. > >Proposals to this component of the LExEn program should be of a 3-5 year >duration, with the understanding that renewal proposals for a second 3-5 >year term would be entertained at the appropriate time. It is anticipated >that one to three sites will be established in FY99 with additional sites to >be added in later LExEn competitions, pending compelling proposals and the >availability of funds. The appropriate level of support for each site is >expected to range from $0.5 to $2.0M per year. > >Coordination of Review Process > >The LExEn special competition for fiscal year 1999 and the NSF special >competition "Microbial Observatories" (MO), the announcement for which is >being released soon and will be available for review at >http://www.nsf.gov/cgi-bin/pubsys/browser/odbrowse.pl, are complementary >programs. Investigators may not submit the same proposal, or proposals that >are substantially similar, to these competitions. The Microbial >Observatories competition is a broad opportunity for investigators to >propose activities directed at the discovery and characterization of >microbes in any environment on earth. The LExEn competition is focused upon >interdisciplinary studies of microbial life-forms in extreme environments, >with emphases upon understanding the processes that determine the >characteristics of the environments, and upon gaining knowledge to provide >the basis for detecting and understanding life forms that may exist beyond >our own planet. > >Given the potential for overlap between proposals submitted to these >complementary competitions, NSF plans to coordinate the review processes by >scheduling the respective panels to enable joint consideration of >appropriate proposals where necessary. > >The National Science Foundation Directorate for Biological Sciences will >host an annual meeting of all LExEn and MO awardees who are engaged in >microbial discovery activities. The purpose of this meeting will be to >facilitate an exchange of ideas and information, to promote interaction >among investigators and sites, and to build links between research programs >with related or complementary objectives. Each proposal should include >sufficient funds in its budget request to cover the costs of attending this >meeting for the Principal Investigator and co-Principal Investigators. > > >Proposal Preparation and Submission Instructions > >Proposals submitted in response to this Announcement of Opportunity will be >accepted from colleges, universities, and other non-profit institutions in >the United States. Proposals involving collaboration with researchers and >facilities of other countries or international groups are welcome, provided >support is requested only for the U.S. portion of the collaborative effort. > >Proposals submitted in response to this program announcement should be >prepared and submitted in accordance with the general guidelines contained >in the Grant Proposal Guide (GPG), NSF 99-2. For proposals involving field >work in Antarctica, guidelines described in the "Antarctic Research >Opportunities and Proposal Guide" NSF 96-93 should be followed. These are >available electronically on the NSF Web site at: . >Paper copies may be obtained from the NSF Publications Clearinghouse, >telephone 301-947-2722 or by e-mail from pubs@........ > >Proposals will be subjected to initial screening for the requirements in the >GPG and will be returned without review or advance notification if >deficiencies are found. Proposals will NOT be forwarded to other programs if >found to be inappropriate for this competition. Proposals submitted in >response to this announcement must be received at NSF no later than close of >business on March 5, 1999. > >The NSF FastLane system is available for electronic preparation and >submission of a proposal through the Web at the FastLane Web site at >. Submission via Fastlane is strongly >encouraged. > >Group and collaborative proposals involving more than one institution MUST >be submitted as a single administrative package from one of the institutions >involved. Multiple submissions will not be accepted. (The proposal may be >split into separate awards if the project is recommended for support.) > >Proposers requiring the use of a UNOLS ship or submersible must submit a >ship request form to NSF?s Division of Ocean Sciences as well as the UNOLS >office and the operator of any requested ship or ships. > > >Proposal Review Information > >Proposals will be evaluated by ad hoc mail and panel review in accordance >with established Foundation procedures and the criteria described below. It >is anticipated that each review panel will have expertise in the fields of >astronomy, planetary sciences, chemistry, geochemistry, biology, atmospheric >sciences, earth sciences, ocean sciences, polar sciences, and engineering. > > >Merit Review Criteria > >Review of proposals submitted to NSF are solicited from peers with expertise >in the substantive area of the proposed research or education project. These >reviewers are selected by Program Officers charged with the oversight of the >review process. NSF invites the proposer to suggest at the time of >submission, the names of appropriate or inappropriate reviewers. Special >care is taken to ensure that reviewers have no immediate and obvious >conflicts with the proposer. Special efforts are made to recruit reviewers >from non-academic institutions, minority serving institutions, adjacent >disciplines to that principally addressed in the proposal, first time NSF >reviewers, etc. > >Proposals will be reviewed against the following general merit review >criteria established by the National Science Board. Following each criterion >are potential considerations that the reviewer may employ in the evaluation. >These are suggestions and not all will apply to any given proposal. Each >reviewer will be asked to address only those that are relevant to the >proposal and for which he/she is qualified to make judgments. > >What is the intellectual merit of the proposed activity? > >How important is the proposed activity to advancing knowledge and >understanding within its own field or across different fields? How well >qualified is the proposer (individual or team) to conduct the project? (If >appropriate, the reviewer will comment on the quality of prior work.) To >what extent does the proposed activity suggest and explore creative and >original concepts? How well conceived and organized is the proposed >activity? Is there sufficient access to resources? > >What are the broader impacts of the proposed activity? > >How well does the activity advance discovery and understanding while >promoting teaching, training, and learning? How well does the proposed >activity broaden the participation of underrepresented groups (e.g., gender, >ethnicity, disability, geographic, etc.)? To what extent will it enhance the >infrastructure for research and education, such as facilities, >instrumentation, networks, and partnerships? Will the results be >disseminated broadly to enhance scientific and technological understanding? >What may be the benefits of the proposed activity to society? > >For proposals that are responsive to the two interdisciplinary components of >this Announcement of Opportunity (i.e. the LExEn Interdisciplinary Research >Program and LExEn Sites for Long-term Interdisciplinary Studies) another >criterion in the review process will be the potential interdisciplinary >synergism among the various research components. > > >Integration of Research and Education > >One of the principal strategies in support of NSF?s goals is to foster >integration of research and education through the programs, projects and >activities it supports at academic and research institutions. These >institutions provide abundant opportunities where individuals may >concurrently assume responsibilities as researchers, educators, and students >and where all can engage in joint efforts that infuse education with the >excitement of discovery and enrich research through the diversity of learner >perspectives. PIs should address this issue in their proposals to provide >reviewers with the information necessary to respond fully to both NSF merit >review criteria. NSF staff will give it careful consideration in making >funding decisions. > > >Integrating Diversity into NSF Program, Projects, and Activities > >Broadening opportunities and enabling the participation of all citizens - >women and men, underrepresented minorities, and persons with disabilities - >is essential to the health and vitality of science and engineering. NSF is >committed to this principle of diversity and deems it central to the >programs, projects, and activities it considers and supports. You should >address this issue in your proposals to provide reviewers with the >information necessary to respond fully to both NSF merit review criteria. >NSF staff will give it careful consideration in making funding decisions. > > >Grant Administration and Conditions > >Grants awarded as a result of this announcement will be administered in >accordance with the terms and conditions of NSF GC-1 (10/98) or FDP-III >(7/1/97), Grant General Conditions. Copies of these documents are available >from the NSF online document system: http://www.nsf.gov/cgi-bin/ >pubsys/browser/odbrowse.pl. More information is contained in the NSF Grant >Policy Manual, (NSF 95-26) available electronically on the NSF Web site or >in paper copy by subscription from the Superintendent of Documents, >Government Printing Office, Washington, DC 20402. > > >Contacts for Additional Information > >This announcement, and other LExEn-related information, is available on-line >at http://www.nsf.gov/ >home/crssprgm/lexen/start.htm. >If you have questions or require further information, contact: > >Division of Environmental Biology >Douglas Siegel-Causey, (703) 306-1481, dsiegel@....... > >Division of Molecular and Cellular Biosciences >Philip Harriman, (703) 306-1439, pharrima@....... > >Division of Astronomical Sciences >Eileen Friel, (703) 306-1826, efriel@....... > >Division of Chemistry >George Rubottom, (703) 306-1851, grubotto@....... > >Division of Bioengineering and Environmental Systems >Frederick Heineken, (703) 306-1319, fheineken@....... > >Division of Atmospheric Sciences >Jarvis Moyers, (703) 306-1523, jmoyers@....... > >Division of Earth Sciences >Richard Lane, (703) 306-1551, hlane@....... > >Division of Ocean Sciences >Phillip Taylor, (703) 306-1587, prtaylor@....... >David Epp, (703) 306-1586, depp@....... > >Office of Polar Programs - Antarctic Research Section >Polly Penhale, (703) 306-1033, ppenhale@....... > >Office of Polar Programs - Arctic Research Section >Linda Duguay, (703) 306-1029, lduguay@....... >Office of Space Science, NASA >Michael Meyer, (202) 358-0307, mmeyer@........... > > > ABOUT THE NATIONAL SCIENCE FOUNDATION > > > >NSF funds research and education in most fields of science and engineering. >Grantees are wholly responsible for conducting their project activities and >preparing the results for publication. Thus, the Foundation does not assume >responsibility for such findings or their interpretation. > >NSF welcomes proposals on behalf of all qualified scientists, engineers and >educators. The Foundation strongly encourages women, minorities and persons >with disabilities to participate fully in its programs. In accordance with >Federal statutes, regulations and NSF policies, no person on grounds of >race, color, age, sex, national origin or disability shall be excluded from >participation in, be denied the benefits of, or be subjected to >discrimination under any program or activity receiving financial assistance >from NSF (some programs may have special requirements that limit >eligibility). > >Facilitation Awards for Scientists and Engineers with Disabilities provide >funding for special assistance or equipment to enable persons with >disabilities to work on NSF-supported projects. (For more information, see >Section V.G.) > >The National Science Foundation has Telephonic Device for the Deaf (TDD) and >Federal Information Relay Service (FIRS) capabilities that enable >individuals with hearing impairments to communicate with the Foundation >about NSF programs, employment or general information. TDD may be accessed >at (703) 306-0090, FIRS at 1-800-877-8339. > > > PRIVACY ACT AND PUBLIC BURDEN STATEMENTS > >The information requested on proposal forms and project reports is solicited >under the authority of the National Science Foundation Act of 1950, as >amended. The information on proposal forms will be used in connection with >the selection of qualified proposals; and project reports submitted by >awardees will be used for program evaluation and reporting within the >Executive Branch and to Congress. The information requested may be disclosed >to qualified reviewers and staff assistants as part of the proposal review >process; to proposer institutions/grantees to provide or obtain data >regarding the proposal review process, award decisions, or the >administration of awards; to government contractors, experts, volunteers and >researchers and educators as necessary to complete assigned work; to other >government agencies needing information as part of the review process or in >order to coordinate programs; and to another Federal agency, court or party >in a court or Federal administrative proceeding if the government is a >party. Information about Principal Investigators may be added to the >Reviewer file and used to select potential candidates to serve as peer >reviewers or advisory committee members. See Systems of Records, NSF-50, >"Principal Investigator/Proposal File and Associated Records," 63 Federal >Register 267 (January 5, 1998), and NSF-51, "Reviewer/Proposal File and >Associated Records," 63 Federal Register 268 (January 5, 1998). Submission >of the information is voluntary. Failure to provide full and complete >information, however, may reduce the possibility of receiving an award. > >Public reporting burden for this collection of information is estimated to >average 120 hours per response, including the time for reviewing >instructions. Send comments regarding this burden estimate and any other >aspect of this collection of information, including suggestions for reducing >this burden, to: > >Mary Lou Higgs >Acting Reports Clearance Officer >Information Dissemination Branch >Division of Administrative Services >National Science Foundation >Arlington, VA 22230 > > >OMB 3145-0058 >PT 34 >KW: 1002091 1002083 1002146 1002001 1007001 1015800 1015790 1005017 0710035 >0710015 1003012 1003002 >CFDA No. 47.050 47.074 47.041 47.078 47.079 > >NSF 99-43 >(replaces NSF 97-157) > > > _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: meredith lamb Subject: Re: Lehmans and cold weather Date: Wed, 30 Dec 1998 22:48:06 -0700 RLLaney@....... wrote: > I would appreciate comments from anyone in the PSN group who is operating a > Lehman in cold weather, has done so in the past or otherwise has knowledge of > operation of seismographs in cold weather. > > A Lehman and SG sensor are on the floor of my garage. Both sensors have an > inner cover made of wall paneling and plexiglas. An outer cover is made of > 2-inch styrofoam. As night-time temperatures fall through about 40 degrees, > the trace of the Lehman begins to have wide swings in amplitude. The more the > temperature lowers the wider the swings in amplitude. The SG is largely > unaffected. I thought for a time that the swings were irregular, but it turns > out that the noise is cyclical and has a period of about 20 seconds. Bob, Not really much to add on temperature affects, but I used to have my "Lehmans" on the ground underneath the house here. Now they are enclosed in heavy insulation.......what a difference! Used to have to adjust roughly every 2 weeks....now it is maybe every 3-4 months. Don't use any heat whatsoever...figure the temp change dissapation over time, wouldn't subject as rapid instrument changes...and it seems to work OK. Big part of it is new massive piers also. My S-G's with Hall sensors are not in the enclosure, and are really only wind protected.....adjustment maybe every 2 weeks. Improvement pending. Probably no help to you. For me, massive insulation...like 40-60 R, overall, really helped here. Its a pain to install, but....... Denver, Colorado temperature changes range up to 40 degrees daily, roughly at this time of year. Meredith Lamb _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: Greg Lyzenga Subject: Re: Lehmans and cold weather Date: Wed, 30 Dec 1998 22:14:20 -0800 >I would appreciate comments from anyone in the PSN group who is operating a >Lehman in cold weather, has done so in the past or otherwise has knowledge of >operation of seismographs in cold weather. > ... rest of message deleted ... > >Anyway, I would appreciate hearing comments on this issue. > >Thanks. > >Bob Laney >Herndon, VA Hi Bob: Your experience closely parallels my own. What you are observing are air convection currents in the Lehman enclosure box. Such currents will occur whenever the floor temperature is higher than that of the overlying air, as occurs during evenings or cold snaps. The quasi-cyclic nature of the noise I believe to be caused by the slow ascent of plumes and vortices in the air. As you discovered, adding a heat source to the top of the box effectively shuts down the convection my making the top warmer than the bottom, eliminating the inversion condition. It has been my experience though, that the light bulb itself can be a source of turbulence, and my best results were obtained by putting a lot of effort into insulation and baffling. I have lined the inside of my box with a few inches of styrofoam insulation, and covered the concrete garage floor inside the box with styrofoam packing peanuts. Finally, I put in several fiberboard baffles within the box to break up the volume and inhibit the formation of currents. These measures made a great difference; before adding these changes, the noise made my Lehman all but useless for teleseisms for as much as 12 hours per day, particularly in cold weather. With the described modifications, I very rarely if ever observe the temperature effects you describe. It's a bit of a hassle to fuss with all of this, but in the end it is definitely worth the effort. I hope my comments help you! - Greg Lyzenga |Gregory A. Lyzenga *** (909) 621-8378 |Dept. of Physics, Harvey Mudd College *** fax (909) 621-8887 |Claremont, CA 91711-5990 http://www.physics.hmc.edu/profs/lyzenga.html _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Giovanni Rotta" Subject: HAPPY NEW YEAR ! ! Date: Thu, 31 Dec 1998 16:00:34 +0100 Happy new year to the PSN family ! Giovanni Giovanni Rotta Via F. Pizzigoni, 10 33010 Resia (Udine) I Lat. 46.373 N Long. 13.305 E rottag@.......... http://www.geocities.com/~resianet/ingssr.htm _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email listserver@.............. with the body of the message: leave PSN-L From: "Francesco" Subject: HAPPY NEW YEAR Date: Thu, 31 Dec 1998 19:04:03 +0100 HAPPY NEW YEAR TO ALL FRIENDS OF PSN, AROUND THE WORLD. SINCERLY FRANCESCO NUCERA - ITALY
HAPPY NEW YEAR TO ALL FRIENDS OF = PSN, AROUND THE=20 WORLD.
 
SINCERLY
FRANCESCO NUCERA -=20 ITALY