Subject: re: more seis feet From: "David Saum" DSaum@............ Date: Mon, 1 Jan 2001 12:14:14 -0500 > If I don't see the microseisms I try to find out what went wrong. > Seismologists have not gone to all the effort of piers, vaults, proximity > to bedrock, etc, because they have too much money (fat chance), but to > reduce the noise of the instrument environment. Some of us are operating our systems under constraints that rich seismologists never dreamed of. For instance my Lehman is on the carpeted slab in an office building and my landlord would not be pleased if I damaged the carpet. I can imagine other non ideal locations such as upper floors in buildings, but they may be the only available or most convenient location. Perhaps these "less than ideal" locations should not be eliminated without an experimental test since there seems to be no basic physics that excludes them a priori. The two most important empirical tests seem to be: 1. is the level stable over time? 2. can it detect microseisms? My one data point with a Lehman on carpeted floor suggests that detecting microseisms is no problem, and long term level stability is not a problem if you are willing to put up with noise spikes from occasional floor tilts due to building operation and occupancy. BTW: I liked the idea of resting the entire Lehman on a slab of glass. That might make the carpet even less of a factor. I will give it a try. Ciao, Dave Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: more seis feet From: "Charles R. Patton" charles.r.patton@........ Date: Mon, 01 Jan 2001 09:30:43 -0800 A further thought on a stable platform on carpet might be to drive three nails thru the carpet into the slab or floor. Done carefully the nails would leave relatively small holes that would be easy to cover by re-brushing the carpet after their removal at some further date. Top the nails with ball bearings that are glued on (or previously brazed on). Then make a platform from a hardened material with the kinematic depressions as I previously described, except do it on both sides. Place the platform on the nail tops, then your seimo on the platform. Everything would be locked together with a kinematic mount. Charles R. Patton __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: instrument siting From: sean@........... Date: Mon, 1 Jan 2001 16:06:47 -0600 (CST) Dave, You are way out of line and very mis-informed in stating that seismologists are "rich". Over three decades I have seen amazing self sacrifice and personal investment on the part of seismologists to achieve the data quality that is required. The current new generation of broadband instruments are so expensive that often the qualified technical personnel to install and operate them have to be left out of the budget, and volunteers have to try to do the work. The only people who had adequate funding was the AFOSR (Air Force Office of Scientific Research) during the cold war for installing seismic systems for nuclear test detection. Even the current CBTB (comprehensive test ban treaty) verification instrumentation funding is very limited. But for the most part, most seismologists have to do most of the work of preparing sites and installing instruments themselves because they cannot afford commercial contractors. And after a site is established, the continuing operation is up to the scientists' dedication, like paying the postage to mail data tapes. We "rich seismologists" of course have never "dreamed of" such poor sites as a carpeted floor, because in the past 50 years someone has tried it and found the idea to be a dud compared with what their colleagues were getting from more carefully prepared (and probably more difficult) sites. Even in the 20's era of mechanical-optical- photo-recording instruments of quite low sensitivity, the quietness and isolation of a pier in a vault was desired. Our old SLM vault at St. Louis U. was installed deep under the lobby of a new gym in 1923 when a Jesuit (Fr. Macelwane) found bedrock there and twisted other Jesuit arms to get it installed for free. As for the site of a long period instrument, particularly a horizontal, I would encourage everyone to make every effort to optimize the site conditions. I don't think "easy" or "convenient" are valid criteria if you want to record more than a few large quakes per year, like todays Ms 7.2 in the Philippines, which should have been very well recorded by all the PSN instruments. The monthly-or-so M 6.0 events will be about 6% of this amplitude, and should also be clearly recorded just to keep up interest (= maintenance/adjustment). I routinely run preliminary tests of instruments in my lab on the third floor of a very sturdy building (it was designed for 8 floors that never got built because the Univ ran out of $$). Even adjacent to a 30" square pillar, my lab floor runs at about a continuous Ms 3.0 quake. The whole building tilts several micro-radians daily as the sun warms the south side. Even the test pier in the basement is swamped with the noise of the AC fans, the elevators, the streets, etc. My only "good" test site is 40 km away in a WWII munitions bunker, (black powder on the floor) but I still see the noise of the interstate about 0.5 km away. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: more seis feet From: Mark Robinson other@............... Date: Tue, 02 Jan 2001 12:19:06 +1300 Hi all In optical mounts, such as those for the mirrors in an ion laser, there are some refinements which may be of some use in this application. The laser application has similar or greater requirements for accuracy and stability. The principle difference is that the levelling is done between two pieces that are structural to the instrument, and that these two pieces are held in tight coupling to each other. At each of the three mounting points the two plates are held together by suitably strong springs, and pulled apart by the adjusting screws. In general one point is more or less fixed, while the other two points provide adjustment in the x and y dimensions. It would seem natural to put the fixed point under the mast of a lehman. An arrangement of this type would allow the bottom plate to the screwed firmly to whatever surface the instrument is meant to be measuring, and the rest of the instrument adjusted relative to this. a further refinement observable on laser mirror mounts are physical restraints preventing the moveable plate from being displaced by gross shocks. a screw with a waskher and a spacer under it's head through a clearance hole in the adjustable plate, screwed firmly into the base plate is common. The springs are usually mounted to bars set in grooves across holes in both plates. The bearing points are usually ball headed. The fixed point is commonly a ball bearing set over holes in each plate. A well engineered arrangement such as this provides excellent coupling between the instrument and the substrate, as well as fine and repeatable adjustments. and it should stay very firmly put in even a very large shake. I hope this is understandable and helpful. Happy New Year everyone Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: instrument siting From: "David Saum" DSaum@............ Date: Tue, 2 Jan 2001 12:27:00 -0500 I seem to be able to see distant quakes down to about 6 although my Lehman sits on a carpeted basement slab in a noisy environment. Note that I am still debugging my system, and I use Amaseis and WinQuake software. Amaseis seems to screw up some of the file headers passed to Winquake 1/1/01 MINDANDAO, PHILIPPINES 7.2Ms daily Amaseis display with 0.08 LP Hz http://www.infiltec.com/seismo/010101.jpg Winquake LP @ 0.08 Hz http://www.infiltec.com/seismo/010101C.jpg 1/1/02 MINDANDAO, PHILIPPINES 6.2Ms daily Amaseis display with LP @ 0.08 Hz http://www.infiltec.com/seismo/010102.jgp Winquake LP @ 0.08 Hz http://www.infiltec.com/seismo/010102D.jpg Winquake with no LP (analog 4 hz LP) http://www.infiltec.com/seismo/010102C.jpg As you can see there is a lot of slab tilting going on during the day when the building is occupied, and the 6 sec noise is pretty high recently so I get a lot better seismic signal with a LP @ 0.08 Hz. And lucky for me all big quakes occur at night! Ciao, Dave Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Seismometers on ebay From: BOB BARNS roybar@........ Date: Thu, 04 Jan 2001 10:09:18 -0500 Hi gang, There are 3 seismometers currently on sale on ebay. These are said to be Kinemetrics SV-1 5 sec verticals. They look very good. The current price is about $100. Search on "kinemetrics" There is only 12 hrs. left for these auctions. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: R: Seismometers on ebay From: "Giovanni Rotta" rottag@.......... Date: Thu, 4 Jan 2001 17:13:25 +0100 Figlio mio.... Sai usare il compattatore ? Grazie dell'invio, gio ----- Original Message ----- From: BOB BARNS To: PSN mail list Sent: Thursday, January 04, 2001 4:09 PM Subject: Seismometers on ebay > Hi gang, > There are 3 seismometers currently on sale on ebay. These are said to > be Kinemetrics SV-1 5 sec verticals. They look very good. The current > price is about $100. > Search on "kinemetrics" > There is only 12 hrs. left for these auctions. > Bob Barns > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: R: Seismometers on ebay From: "Ted Blank" ted@.......... Date: Thu, 4 Jan 2001 11:43:56 -0500 Agree they look nice, but none has yet met the reserve price (unknown until somebody exceeds it). Regards, Ted Blank __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Seismometers on ebay From: "meredith lamb" mlamb1@.......... Date: Thu, 04 Jan 2001 08:18:30 -0800 Amazing....but there is actually 6 seismometers there. Items #'s: 1204280154 1204282138 1204282921 1204287703 1204288753 1204290420 and if you count the vibration analyzer 1204676062 which is over $1000.00 now, thats 7. All current auctions by "info@..............", out of Albequebue, New Mexico. Three short period vertical, one short period "omni-directional" seis, and two Long period units. The reserve on the long period (10-30 sec) units IS established at $200.00 I see. Should be interesting bidding.... Meredith Lamb BOB BARNS wrote: > Hi gang, > There are 3 seismometers currently on sale on ebay. These are said to > be Kinemetrics SV-1 5 sec verticals. They look very good. The current > price is about $100. > Search on "kinemetrics" > There is only 12 hrs. left for these auctions. > Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: The entire world, at night. From: Steve Hammond Shammon1@............. Date: Thu, 04 Jan 2001 13:03:53 -0800 Wow! Check this out. I'm sure there is some use for it in seismology. Be sure to scroll to see it all. http://antwrp.gsfc.nasa.gov/apod/image/0011/earthlights_dmsp_big.jpg Regards, Steve Hammod PSN Aptos, CA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Heilplot Software for SDR files From: Arie Verveer ajbv@............ Date: Fri, 05 Jan 2001 13:33:44 +0800 Hi, I have just completed a program that converts the data files (ChanX.xxx) from Larry's "SDR" program into 24 hour heilplots. If you have a lot of raw "SDR" data and would like to convert them into a "GIF" file heilplot then the program can be found at: (Click "Download PSN related Software" at the bottom of the page) http://www.iinet.net.au/~ajbv/ This program is very memory intensive and runs in a “dos” environment on a window's machine. WIN 95/98/NT/? It would be wise to read the instructions before using the program. There are many options in the program, from digital filtering, scaling to wild card selection on files. Its mode of operation depends on software switch settings in an initialization file called "SdrDrum.ini". This form of operation allows for greater flexibility as the program may be run via the operator, "scheduling" program or even a server "CGI" request. Whatever. The "GIF" file report can be viewed with your favorate "graphics viewer" or placed in your Web page. Cheers Arie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Seismometers on ebay From: RADIOTEL@....... Date: Fri, 5 Jan 2001 00:44:36 EST The company that sold the SV-1 and other seismometers on Ebay also have several Kinemetric SH-1 seismometers for sale. They can be reached at the following Email address: info@.............. Jim Allen Cerritos, Ca. The company that sold the SV-1 and other seismometers on Ebay also have
seve ral Kinemetric SH-1 seismometers for sale.  They can be reached at the
following Email address:  info@........... com    
Jim Allen
Cerritos, Ca.
Subject: Re: Seismometers on ebay From: ChrisAtUpw@....... Date: Fri, 5 Jan 2001 13:42:14 EST In a message dated 04/01/01, mlamb1@.......... writes: > Amazing....but there is actually 6 seismometers there. Ebay Items #'s: > Three short period vertical, 1204280154 1204282138 1204282921 Kinemetrics SV-1 $327-80, $338-40, $360-88 > one short period "omni-directional" 1204287703 Geotech S-500 $151-88 > two Long period units. 1204288753, 1204290420 Geotech SL-220 $342-60, $296-40 Meredith, For reference, these were the final bids for the above equipment. Regards, Chris __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: The entire world, at night. From: Bob Smith bobsmith5@........ Date: Fri, 05 Jan 2001 17:43:36 -0500 Steve -- Thank you! A truly amazing image. I see a couple of remarkable things. 1. Note the Suez canal, a brilliant trace of light from the Med on South. 2. I don't see an equivalent artifact for the Panama canal??? 3. The polar areas are marked by deep blue/violet colors. Is this a product of the imaging process (perhaps due to the temperature of the polar ice regions) ? Bob Smith Steve Hammond wrote: > > Wow! Check this out. I'm sure there is some use for it in seismology. > Be sure to scroll to see it all. > > http://antwrp.gsfc.nasa.gov/apod/image/0011/earthlights_dmsp_big.jpg > > Regards, Steve Hammod > PSN Aptos, CA > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- --------- Avoid computer viruses -- Practice safe hex ------------- * * Specializing in small, cost effective embedded control systems * * Robert L. (Bob) Smith Smith Machine Works, Inc. internet bobsmith5@.............. Lumlay Road landline 804/745-1065 Richmond, Virginia 23236+1004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: The entire world, at night. From: Mark Robinson other@............... Date: Sat, 06 Jan 2001 12:21:14 +1300 > 3. The polar areas are marked by deep blue/violet colors. > Is this a product of the imaging process (perhaps due to the > temperature of the polar ice regions) ? I was given this image on a poster a few years ago. The coloured areas at the poles are intended to be a representation of aurora. Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: The entire world, at night. From: "Robert W. Avakian" ravakian@............ Date: Sun, 07 Jan 2001 00:33:25 -0600 I just checked my copy of the poster and, this image is probably not the same. The internet image seems to have higher resolution. Where, on the poster, there are blobs of light in the Saudi pennisula, the electronic image shows individual signaturesl. There also seems to be less agricultural burning in Africa. I'd think this is a more recent image suite. The aurora effeect on the paper image is missing on the web, but you can distinguish land and pack ice in the Arctic on the electronicimage! In any case, I'd love to get this image on paper Bob Avakian Mark Robinson wrote: > > 3. The polar areas are marked by deep blue/violet colors. > > Is this a product of the imaging process (perhaps due to the > > temperature of the polar ice regions) ? > > I was given this image on a poster a few years ago. The coloured areas > at the poles are intended to be a representation of aurora. > > Mark > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. I just checked my copy of the poster and, this image is probably not the same.  The internet image seems to have higher resolution.  Where, on the poster,  there are  blobs of  light in the Saudi pennisula, the electronic image shows individual signaturesl.  There also seems to be less agricultural burning in Africa. I'd think this is a more recent image suite.

The aurora effeect on the  paper image is missing on the web, but you can distinguish land and pack ice in the Arctic on the electronicimage!

In any case, I'd love to get this image on paper

Bob Avakian

Mark Robinson wrote:

> 3.  The polar areas are marked by deep blue/violet colors.
> Is this a product of the imaging process (perhaps due to the
> temperature of the polar ice regions) ?

I was given this image on a poster a few years ago. The coloured areas
at the poles are intended to be a representation of aurora.

Mark
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

To leave this list email PSN-L-REQUEST@.............. with
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Subject: Re: The entire world, at night. From: "David A. Nelson" davenn@........... Date: Mon, 8 Jan 2001 12:32:14 +1100 Happy new year all yup i am still in the land of the living.... been residing in australia for the last 12 months and as yet dont have a system set up... am going to have to build a lehman as very few local events to warrent short period geophones being used I am still doing updates and additions to the PSN members lists and maps so still send info to me... thankyou re the world nitetime view image... AWESOME the first thought that comes to my mind.. being an astronomer... is no wonder its hard to find dark observing skies in the western world these days!!! i may have to move to the outback of aussie haha.... dunno if my new wife would be agreeable to that plan tho cheers and may 2001 be a great year for u all Dave Dave A. Nelson ZL4TBN 13 Monash Rd., Gladesville, (Sydney) 2111 NSW, Australia http://www.seismicnet.com/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) Subject: Re: Heilplot Software for SDR files From: Dick Webb dwebb2@.............. Date: Mon, 08 Jan 2001 21:05:52 -0500 Arie, your program works like a charm!. Actually, I processed the last six months of data and it only took about 20 minutes on a 450 MHz pentium. Thanks, Dick At 01:33 PM 1/5/01 +0800, you wrote: >Hi, I have just completed a program that converts the data files (ChanX.xxx) >from Larry's "SDR" program into 24 hour heilplots. If you have a lot of >raw "SDR" data and would like to convert them into a "GIF" file heilplot >then the program can be found at: > >(Click "Download PSN related Software" at the bottom of the page) > >http://www.iinet.net.au/~ajbv/ > >This program is very memory intensive and runs in a "dos" environment on a >window's machine. WIN 95/98/NT/? It would be wise to read the instructions >before using the program. There are many options in the program, from digital >filtering, scaling to wild card selection on files. Its mode of operation >depends on software switch settings in an initialization file called >"SdrDrum.ini". This form of operation allows for greater flexibility as the >program may be run via the operator, "scheduling" program or even a server >"CGI" request. Whatever. > >The "GIF" file report can be viewed with your favorate "graphics viewer" or >placed in your Web page. > > >Cheers > >Arie >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: LP filters, A/D bits and SPS From: "David Saum" DSaum@............ Date: Fri, 12 Jan 2001 12:06:56 -0500 I am confused about the relationships between seismic LP filtering, A/D and SPS. Suppose I have an 8 pole bessel filter with a -3 db point of 10 Hz and a 16 bit A/D. Log10(2^16)=4.81, so in power that is 96 db dynamic range. My 8 pole bessel response is down 96 db at about 80 Hz. So I should sample at a minimum of 160 Hz to avoid aliasing that will screw up my lowest bit ? Similarly, for a LP of 1 Hz I should sample at a minimum of 16 SPS? This seems to be a lot higher SPS than most folks are using. Can we assume the seismic spectra naturally falls off at higher frequencies so that we do not have to depend on our LP filter at higher frequencies? Or is my math screwy? Confused, Dave Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: LP filters, A/D bits and SPS From: Doug Crice dcrice@............ Date: Fri, 12 Jan 2001 10:05:23 -0800 The short answers are: There are other filters working besides your 8-pole Bessel, like the earth, which is a pretty good low-pass filter. All you really need to filter is the electrical noise and some local cultural noise. I believe your analyis is correct, but assumes that the noise is full scale. A perfect anti-alias filter is just too complex and has too many parts for either amateurs or professionals to build. Compromises happen. To read further, here's a link with a discussion of anti-alias filters in the real world. http://www.chipcenter.com/eexpert/shendrix/shendrix005-2.html Doug Crice David Saum wrote: > > I am confused about the relationships between > seismic LP filtering, A/D and SPS. > > Suppose I have an 8 pole bessel filter > with a -3 db point of 10 Hz and a 16 bit A/D. > > Log10(2^16)=4.81, so in power that is 96 db > dynamic range. > > My 8 pole bessel response is down 96 db > at about 80 Hz. > > So I should sample at a minimum of 160 Hz to > avoid aliasing that will screw up my lowest bit ? > Similarly, for a LP of 1 Hz I should sample at > a minimum of 16 SPS? > > This seems to be a lot higher SPS than most folks > are using. Can we assume the seismic spectra > naturally falls off at higher frequencies so that we > do not have to depend on our LP filter > at higher frequencies? > > Or is my math screwy? > > Confused, > > Dave Saum > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: LP filters, A/D bits and SPS From: Karl Cunningham karlc@.......... Date: Fri, 12 Jan 2001 11:33:58 -0800 Hi Dave -- Your math sounds fine to me. But unless you are very close to an earthquake, there isn't going to be much energy at 80Hz. The large dynamic range needed for seismic recording is primarily to accommodate the wide variation in peak amplitudes from seismic signals. 16-bit accuracy is not needed, and really 8 bits of accuracy is more than enough for most purposes. The fact that the lower bits are being affected by aliasing isn't much of a concern if the higher bits are recording good data. Regards, Karl Cunningham At 12:06 PM 1/12/2001 -0500, you wrote: >I am confused about the relationships between >seismic LP filtering, A/D and SPS. > >Suppose I have an 8 pole bessel filter >with a -3 db point of 10 Hz and a 16 bit A/D. > >Log10(2^16)=4.81, so in power that is 96 db >dynamic range. > >My 8 pole bessel response is down 96 db >at about 80 Hz. > >So I should sample at a minimum of 160 Hz to >avoid aliasing that will screw up my lowest bit ? >Similarly, for a LP of 1 Hz I should sample at >a minimum of 16 SPS? > >This seems to be a lot higher SPS than most folks >are using. Can we assume the seismic spectra >naturally falls off at higher frequencies so that we >do not have to depend on our LP filter >at higher frequencies? > >Or is my math screwy? > >Confused, > >Dave Saum > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: LP filters, A/D bits and SPS From: barry lotz gbl@....... Date: Fri, 12 Jan 2001 06:17:09 -0800 Hi Dave Sean Thomas had an email awhile back which included an equation for calculating signal amplitude for various magnitude quakes and distances. I believe 16 bit is not unreasonable . Example: at the sensitivity of my sensor magnitude distance count 3.0 250k 150 5.2 250k 32768 5.5 9000k 150 7.7 9000k 32768 winter microseism's na 300 These are approximate values I picked off a log-log graph I plotted. STM had a more extensive table. It is interesting to plot STM's equation and then plot p-p magnitudes that one obtains from ones recorded events. I plotted log distance on the x-axis and log count on the y-axis. Magnitude lines were then plotted in 0.5 intervals. Regards Barry __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: A/D bits, LP filters From: sean@........... Date: Sat, 13 Jan 2001 03:00:41 -0600 (CST) Regarding the amplitude of seismic waves and digitizer range: I must disagree with Karl when he says 8 bits of accuracy, by which I assume he also means resolution, is sufficient. (Accuracy more properly describes the precision of the reference voltage that determines the value of a bit). Modern seismic studies use the entire content of the waveform for source modeling, tomagraphy, path attenuation, etc, which are dependent on having an un-clipped and un-distorted signal for spectral analysis. A single clipped peak ruins the spectral analysis. Earthquake waveform amplitudes vary logarithmically, and the magnitude scales reflect this. A magnitude M 5 is 100 times more amplitude than a M 3 (everything else being equal). An 8-bit digitizer has a range of 256 counts, 12 bits is 4096, and 16 bits is 65536 counts (or half these values if a bit is used for the sign (+,-). All our newer multichannel broadband stations use 24 bit digitizers which have a range of 16 777 216 counts for a 40 volt p-p signal from sensors with an output of about 2000 volts/meter/second. While we infrequently (like monthly) see amplitudes that actually exceed the 16 bit range, large quakes greater than M 7+ do use much of the dynamic range. I have data from our stations exceeding 2 000 000 counts from South Pacific and Eurasian events. Of course a great quake in the near field of the station would clip the 24 bit system, so most IRIS stations also have a 3 component FBA (Force Balance Accelerometer). The background noise (natural and instrumental) of our stations runs about 200 counts at about -160 db PSD. The least count is 2.384 microvolts. But for my digitizer here at home, I am still using the 12 bit multimeter at 1 sample/second, with a full scale of 200 mv, and a least count of 0.1 mv connected to the STM seis with an output of 1640 v/m/sec. 6-second microseisms run 3 to 15 mv, and it clips on most events greater than M 7.0. And a comment about filters. Doug is quite correct about the natural attenuation of frequencies above a few tens of hz. For all out short period stations (1 hz seismometers) we have a 4-pole Bessel filter in the pre-amp (plus the usual single 30 to 50 hz low pass poles (to reduce amplifying 60 hz noise) that are created by by-passing the high value gain (feedback) Rs with a capacitor, as shown in the pre-amp schematic on my site). After the telemetry (VCO, FM transmitter, FM Receiver, and Discriminator PLL) another 17hz 4-pole filter provides anti-aliasing for the 20 sps digitizer. At my CCM station, the 1 hz high gain system for the CTBT (Comprehensive Test Ban Treaty) uses a 24 hz low pass filter for its 40 sample/sec channels. Although the rules for anti-aliasing are exact, the content of the seismic signal allows some convenient variation; as Doug points out, the actual noise is only a small percentage of the full scale signal. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Strong shock somewhere relatively nearby? From: "meredith lamb" mlamb1@.......... Date: Sat, 13 Jan 2001 10:52:59 -0800 Hi all, Just getting strong P, or whatever waves here in Denver about UTC 17:46... now. Appears to be relatively close by ~ afew hundred or thousand odd miles..... higher frequency, than a distant sample would show. At 17:52, its still short period but strong. Any notes elsewhere? Meredith Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: "bobodude" bobodude@............. Date: Sat, 13 Jan 2001 09:59:29 -0800 It very big here on the west coast. ----- Original Message ----- From: meredith lamb To: Sent: Saturday, January 13, 2001 10:52 AM Subject: Strong shock somewhere relatively nearby? > Hi all, > > Just getting strong P, or whatever waves here in Denver about > UTC 17:46... now. Appears to be relatively close by ~ afew > hundred or thousand odd miles..... higher frequency, than a > distant sample would show. At 17:52, its still short period > but strong. > > Any notes elsewhere? > > Meredith Lamb > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: "Bryan & Regina Goss" bgoss@.................. Date: Sat, 13 Jan 2001 12:00:44 -0600 I am getting very strong waves here in Mississippi started at 17:40 UTC ----- Original Message ----- From: meredith lamb To: Sent: Saturday, January 13, 2001 12:52 PM Subject: Strong shock somewhere relatively nearby? > Hi all, > > Just getting strong P, or whatever waves here in Denver about > UTC 17:46... now. Appears to be relatively close by ~ afew > hundred or thousand odd miles..... higher frequency, than a > distant sample would show. At 17:52, its still short period > but strong. > > Any notes elsewhere? > > Meredith Lamb > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: Angel Rodriguez angel@............ Date: Sat, 13 Jan 2001 13:02:26 -0500 Hello meredith, Saturday, January 13, 2001, 1:52:59 PM, you wrote: ml> Hi all, ml> Just getting strong P, or whatever waves here in Denver about ml> UTC 17:46... now. Appears to be relatively close by ~ afew ml> hundred or thousand odd miles..... higher frequency, than a ml> distant sample would show. At 17:52, its still short period ml> but strong. ml> Any notes elsewhere? ml> Meredith Lamb ml> __________________________________________________________ ml> Public Seismic Network Mailing List (PSN-L) ml> To leave this list email PSN-L-REQUEST@.............. with ml> the body of the message (first line only): unsubscribe ml> See http://www.seismicnet.com/maillist.html for more information. angel here in Panama: I felt this one very strongly. My short periods saturated. I will post soon! -- Best regards, Angel mailto:angel@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: A/D bits, LP filters From: Karl Cunningham karlc@.......... Date: Sat, 13 Jan 2001 10:07:49 -0800 Hi Sean-Thomas -- You're right. I didn't mean accuracy. But I'm not sure I really meant resolution either. Perhaps "precision" (or distortion level) might have been a better choice of words. What I was trying to say (and please correct me if I'm wrong) is that it isn't necessary for the system to faithfully record the waveform to within 15ppm (16 bits) for a full-scale signal. For very small signals you want to get as many bits of good data as possible. But if the signal is large, perhaps allowing an imprecision (in other words distortion, including aliases) of something like 8 bits (0.4% of the peak-to-peak signal at the time) may be good enough. Of course, it depends completely on what the data is to be used for. I was suggesting that the compromise of allowing unintentionally aliased out-of-band signals may be ok as long as they are below some fraction of the overall signal level at that time, given the resultant benefit of decreased circuit complexity. Karl At 03:00 1/13/2001 -0600, you wrote: >Regarding the amplitude of seismic waves and digitizer range: > >I must disagree with Karl when he says 8 bits of accuracy, by which I >assume he also means resolution, is sufficient. (Accuracy more properly >describes the precision of the reference voltage that determines the value >of a bit). Modern seismic studies use the entire content of the waveform >for source modeling, tomagraphy, path attenuation, etc, which are dependent >on having an un-clipped and un-distorted signal for spectral analysis. >A single clipped peak ruins the spectral analysis. > >Earthquake waveform amplitudes vary logarithmically, and the magnitude >scales reflect this. A magnitude M 5 is 100 times more amplitude than a >M 3 (everything else being equal). An 8-bit digitizer has a range of >256 counts, 12 bits is 4096, and 16 bits is 65536 counts (or half these >values if a bit is used for the sign (+,-). All our newer multichannel >broadband stations use 24 bit digitizers which have a range of 16 777 216 >counts for a 40 volt p-p signal from sensors with an output of about >2000 volts/meter/second. While we infrequently (like monthly) see amplitudes >that actually exceed the 16 bit range, large quakes greater than M 7+ do >use much of the dynamic range. I have data from our stations exceeding >2 000 000 counts from South Pacific and Eurasian events. Of course a great >quake in the near field of the station would clip the 24 bit system, so most >IRIS stations also have a 3 component FBA (Force Balance Accelerometer). >The background noise (natural and instrumental) of our stations runs >about 200 counts at about -160 db PSD. The least count is 2.384 microvolts. > >But for my digitizer here at home, I am still using the 12 bit multimeter >at 1 sample/second, with a full scale of 200 mv, and a least count of >0.1 mv connected to the STM seis with an output of 1640 v/m/sec. 6-second >microseisms run 3 to 15 mv, and it clips on most events greater than M 7.0. > > >And a comment about filters. Doug is quite correct about the natural >attenuation of frequencies above a few tens of hz. For all out short >period stations (1 hz seismometers) we have a 4-pole Bessel filter in >the pre-amp (plus the usual single 30 to 50 hz low pass poles (to reduce >amplifying 60 hz noise) that are created by by-passing the high value gain >(feedback) Rs with a capacitor, as shown in the pre-amp schematic on my site). >After the telemetry (VCO, FM transmitter, FM Receiver, and Discriminator PLL) >another 17hz 4-pole filter provides anti-aliasing for the 20 sps digitizer. >At my CCM station, the 1 hz high gain system for the CTBT (Comprehensive >Test Ban Treaty) uses a 24 hz low pass filter for its 40 sample/sec channels. >Although the rules for anti-aliasing are exact, the content of the seismic >signal allows some convenient variation; as Doug points out, the actual >noise is only a small percentage of the full scale signal. > >Regards, >Sean-Thomas >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: barry lotz gbl@....... Date: Fri, 12 Jan 2001 22:11:44 -0800 Hi all From the USGS helicorder it appears to be coming from South or central america area since Galapagos is the first to receive and New mexico second. Regards Barry meredith lamb wrote: > Hi all, > > Just getting strong P, or whatever waves here in Denver about > UTC 17:46... now. Appears to be relatively close by ~ afew > hundred or thousand odd miles..... higher frequency, than a > distant sample would show. At 17:52, its still short period > but strong. > > Any notes elsewhere? > > Meredith Lamb > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: R: Strong shock somewhere relatively nearby? From: "Francesco" franuc@...... Date: Sat, 13 Jan 2001 19:12:33 +0100 CENTRAL AMERICA? GOOD TRACES FROM ITALY SOME AGENCIES LOCATED IT HONDURAS/MEXICO I've posted the first vawes (P) of the italian station CASTELLUCCIO (2100 mt o.l.s.) onto psn-event list Ms 6.6? Francesco, Italy ----- Original Message ----- From: bobodude To: Sent: Saturday, January 13, 2001 6:59 PM Subject: Re: Strong shock somewhere relatively nearby? > It very big here on the west coast. > > ----- Original Message ----- > From: meredith lamb > To: > Sent: Saturday, January 13, 2001 10:52 AM > Subject: Strong shock somewhere relatively nearby? > > > > Hi all, > > > > Just getting strong P, or whatever waves here in Denver about > > UTC 17:46... now. Appears to be relatively close by ~ afew > > hundred or thousand odd miles..... higher frequency, than a > > distant sample would show. At 17:52, its still short period > > but strong. > > > > Any notes elsewhere? > > > > Meredith Lamb > > > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: I: EQ Alert 13Jan2001 17:33 From: "Francesco" franuc@...... Date: Sat, 13 Jan 2001 19:18:42 +0100 this is the first alarm message by PUMA Bye Francesco Italy > *********************** Earthquake Notification Message *********************** > > EARTHQUAKE PARAMETERS DETERMINED BY DIFFERENT AGENCIES/METHODS: > > > D a t e Time (UTC) Location Dep Magn. T AGY R e g i o n HHMM > > 13Jan2001 17:33:22.0 12.0N 90.6W 33 mb=6.2 A*NOR OFF COAST OF CENTRAL AMER1755 > 13Jan2001 17:34:03.0 13.0N 88.0W 33 mb=6.3 A*YKA EL SALVADOR 1754 > > Radius: 151 km > **************************************************************************** *** > This is a fully automatic EARTHQUAKE NOTIFICATION MESSAGE > compiled by the Swiss Seismological Service, Zurich, Switzerland. > It was generated according to your subscription to messages based on > - for more information please contact: > - on WWW: http://seismo.ethz.ch/redpuma/redpuma.html > - via E-Mail: kradolfer@.................. > Message generation time: Jan 13 17:55:21 2001 UTC > > Legend: > > T : Location Type (A: Automatic, less reliable; M: Manual, more reliable) > AGY : Agency reporting location: > SED : Swiss Seismological Service GER : GERESS array, Germany > NEI : NEIC, USGS, Golden, CO, U.S.A. NOR : NORSAR Array, Norway > YKA : Yellowknife Array, Canada ING : I.N.G., Rome, Italy > MAD : I.G.N., Madrid, Spain IDC : GSE-IDC, Washington > LED : Geol. Survey B-W,Freiburg,Germany THE : Thessaloniki, Greece > EMS : EMSC/CSEM (LDG/ING/IGN) JPN : JWA, Tokyo, Japan > LDG : LDG, Paris ISR : IPRG,Tel Aviv,Israel > MPK : USGS Menlo Park, U.S.A. BGR : SDAC, Hannover,Germany > ROM : NIEP, Bucharest, Romania GSR : GS RAS, Obninsk, Russia > HHMM : Hour and Minute (UTC) when message arrived in Zurich > Radius: Radius of smallest circle circumscribing all locations marked with * > (this is a measure of the scatter of the locations) > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: I: EQ Alert 13Jan2001 17:33-7.6 From: Canie canie@........... Date: Sat, 13 Jan 2001 10:35:36 -0800 Its listed at NEIC: 01/01/13 17:33:31 12.77N 88.83W 60.0 7.6Mw B OFF COAST OF CENTRAL AMERICA Canie At 07:18 PM 1/13/01 +0100, Francesco wrote: >this is the first alarm message by PUMA > >Bye >Francesco Italy > > > > > *********************** Earthquake Notification Message >*********************** > > > > EARTHQUAKE PARAMETERS DETERMINED BY DIFFERENT AGENCIES/METHODS: > > > > > > D a t e Time (UTC) Location Dep Magn. T AGY R e g i o n >HHMM > > > > 13Jan2001 17:33:22.0 12.0N 90.6W 33 mb=6.2 A*NOR OFF COAST OF CENTRAL >AMER1755 > > 13Jan2001 17:34:03.0 13.0N 88.0W 33 mb=6.3 A*YKA EL SALVADOR >1754 > > > > Radius: 151 km > > >**************************************************************************** >*** > > This is a fully automatic EARTHQUAKE NOTIFICATION MESSAGE > > compiled by the Swiss Seismological Service, Zurich, Switzerland. > > It was generated according to your subscription to messages based on > > - for more information please contact: > > - on WWW: http://seismo.ethz.ch/redpuma/redpuma.html > > - via E-Mail: kradolfer@.................. > > Message generation time: Jan 13 17:55:21 2001 UTC > > > > Legend: > > > > T : Location Type (A: Automatic, less reliable; M: Manual, more >reliable) > > AGY : Agency reporting location: > > SED : Swiss Seismological Service GER : GERESS array, >Germany > > NEI : NEIC, USGS, Golden, CO, U.S.A. NOR : NORSAR Array, >Norway > > YKA : Yellowknife Array, Canada ING : I.N.G., Rome, >Italy > > MAD : I.G.N., Madrid, Spain IDC : GSE-IDC, >Washington > > LED : Geol. Survey B-W,Freiburg,Germany THE : Thessaloniki, >Greece > > EMS : EMSC/CSEM (LDG/ING/IGN) JPN : JWA, Tokyo, Japan > > LDG : LDG, Paris ISR : IPRG,Tel >Aviv,Israel > > MPK : USGS Menlo Park, U.S.A. BGR : SDAC, >Hannover,Germany > > ROM : NIEP, Bucharest, Romania GSR : GS RAS, Obninsk, >Russia > > HHMM : Hour and Minute (UTC) when message arrived in Zurich > > Radius: Radius of smallest circle circumscribing all locations marked with >* > > (this is a measure of the scatter of the locations) > > > > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: A/D bits, LP filters From: barry lotz gbl@....... Date: Fri, 12 Jan 2001 22:38:11 -0800 Hi Karl I look at the 16 bit digitizer as an alternate to a autogain system. I tried autogain changing during events and the bookkeeping became a problem as did the slight zero shifts during gain changes. I would like to record both local and distant signals and seem to use most of the 16 bits . The smallest event p-p I recorded recently is about 500. With a use of 10% of this for minimum signal it would be around 50. I have been wanting to lower my gain a little recently. Looks like with todays event down south I may clip again. Regards Barry Karl Cunningham wrote: > Hi Sean-Thomas -- > > You're right. I didn't mean accuracy. But I'm not sure I really meant > resolution either. Perhaps "precision" (or distortion level) might have > been a better choice of words. > > What I was trying to say (and please correct me if I'm wrong) is that it > isn't necessary for the system to faithfully record the waveform to within > 15ppm (16 bits) for a full-scale signal. For very small signals you want > to get as many bits of good data as possible. But if the signal is large, > perhaps allowing an imprecision (in other words distortion, including > aliases) of something like 8 bits (0.4% of the peak-to-peak signal at the > time) may be good enough. Of course, it depends completely on what the > data is to be used for. > > I was suggesting that the compromise of allowing unintentionally aliased > out-of-band signals may be ok as long as they are below some fraction of > the overall signal level at that time, given the resultant benefit of > decreased circuit complexity. > > Karl > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: [Fwd: PSE POST TO PSN] From: barry lotz gbl@....... Date: Fri, 12 Jan 2001 22:55:31 -0800 I can not deliver my msg to the list, can you pse post it there? A 32 seconds seism (5.8), was felt here at 17:34 UT, causing alarm to locals, located 75 miles SE Guatemala City, in front of El Salvador Coast. Rolando Benitez Guatemala City Subject: RE: Strong shock somewhere relatively nearby? From: "Kareem" kareemjupiter@............. Date: Sat, 13 Jan 2001 13:02:40 -0800 Barry, Where are you seeing the USGS helicorders? No visible traces of the event on my PS2 system - It's vertical and set very low (boohoo). -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of barry lotz Sent: Friday, January 12, 2001 10:12 PM To: psn-l@.............. Subject: Re: Strong shock somewhere relatively nearby? Hi all From the USGS helicorder it appears to be coming from South or central america area since Galapagos is the first to receive and New mexico second. Regards Barry meredith lamb wrote: > Hi all, > > Just getting strong P, or whatever waves here in Denver about > UTC 17:46... now. Appears to be relatively close by ~ afew > hundred or thousand odd miles..... higher frequency, than a > distant sample would show. At 17:52, its still short period > but strong. > > Any notes elsewhere? > > Meredith Lamb > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: earthquake realtime chat in a "just shaken" area... From: "Kareem" kareemjupiter@............. Date: Sat, 13 Jan 2001 13:41:24 -0800 Does anyone know of any realtime chat services in the area of central america which may be dicussing the latest in terms of damage reports, experiences, with the latest earthquake? (For that matter, any chat services involving a group of seism-interested folks?) It would be interesting to be able to monitor a particular area after such a significant quake. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: Michael Tolchard michael@............. Date: Sat, 13 Jan 2001 18:41:27 -0800 Just had a 4.3 in L.A. Area ..... At 10:52 AM 1/13/01 -0800, you wrote: >Hi all, > >Just getting strong P, or whatever waves here in Denver about >UTC 17:46... now. Appears to be relatively close by ~ afew >hundred or thousand odd miles..... higher frequency, than a >distant sample would show. At 17:52, its still short period >but strong. > >Any notes elsewhere? > >Meredith Lamb > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: "I.ES.N." info@........ Date: Sun, 14 Jan 2001 04:14:08 +0100 Hi gang this is the first report on web 02:26:15.4 34.1N 118.6W Mb6.1 A NEIA SOUTHERN CALIFORNIA It's wright? Francesco Italy __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: Canie canie@........... Date: Sat, 13 Jan 2001 19:37:31 -0800 At 04:14 AM 1/14/01 +0100, you wrote: >Hi gang > >this is the first report on web > >02:26:15.4 34.1N 118.6W Mb6.1 A NEIA SOUTHERN CALIFORNIA > >It's wright? No - its wrong - 1 4.3 at 6:26pm pst followed by a 4.1 at 6:50pm - I hope these aren't foreshocks to something bigger! I'm in Long Beach and we did not feel them here but they were felt in Santa Monica area. Canie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: E-Bay possible small seismo base plate From: "meredith lamb" mlamb1@.......... Date: Sat, 13 Jan 2001 21:02:45 -0800 Hi all, Ran across one particular E-Bay item/s which could provide a excellent small seismo base plate; i.e., a S-G, or small boom length horizontal/vertical home brew configuration, or, whatever one can configure on the home front for the size offered. The auction ends January 20th. The seller appears to have a excellent feedback on some 7,000 odd items sold in the past. If one is into tools, misc electrical whatever, be sure to check "view sellers other auctions" which has literally hundred of items listed. The beginning bid (none yet) is $13.99. Stuff like this is very rare. Go to: http://www.ebay.com/index.html They are 1.25" Thick, 7.25" wide and 13.375" length. They appear to have been machine sawed rectangular blocks and look relatively squared. The thickness sure won't allow much bending under load, or any mass wandering tilt influence! Item #'s = 541796378, 541796837, 541797076, 541797319, 541797555, 541797830, 541798213, 541798490, 541798776, 541799069. The seller also has a more private auction site, which appears to offer another 10 of these plates at $14.99 beginning bid, but one would have to register and do whatever the requirements are with that web site. No bids yet, and that ends Jan 19th. http://www.reliableiam.com/cgi-bin/auctioneer.exe?action=list&category=110010 The home beginning page is: http://www.reliabletools.com This seller is in Irwindale, California, U.S.A. Meredith Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: small seismograph From: "Ed Ianni" edwianni@........ Date: Sun, 14 Jan 2001 11:54:53 -0500 Does anyone have specifications for the mini mini seismograph? Thank you. Ed.
Does anyone have specifications = for the mini=20 mini seismograph?
Thank you. = Ed.
Subject: Re: small seismograph From: "Frank Cooper" fxc@....... Date: Sun, 14 Jan 2001 13:56:49 -0600 Hi Ed, Email John Cole of Pearland, Texas, USA, for information as he is the = originator of the mini mini. Note that I have sent a copy of this email = to John. You can see the mini mini on his web page at: = http://freeweb.pdq.net/four.htm Frank Cooper, Friendswood, Texas, USA ----- Original Message -----=20 From: Ed Ianni=20 To: psn-l@................. Sent: Sunday, January 14, 2001 10:54 AM Subject: small seismograph Does anyone have specifications for the mini mini seismograph? Thank you. Ed.
Hi Ed,
Email John Cole of Pearland, Texas, USA, for = information as he=20 is the originator of the mini mini.  Note that I have sent a copy = of this=20 email to John.  You can see the mini mini on his web page at:  = http://freeweb.pdq.net/four.htm<= /A>
Frank Cooper, Friendswood, Texas, USA
----- Original Message -----
From:=20 Ed = Ianni
Sent: Sunday, January 14, 2001 = 10:54=20 AM
Subject: small = seismograph

Does anyone have specifications = for the mini=20 mini seismograph?
Thank you.=20 Ed.
Subject: Re: small seismograph From: "Frank Cooper" fxc@....... Date: Sun, 14 Jan 2001 14:01:06 -0600 Hi Ed, Sorry I did not give the complete url for John Cole's web page. It can = be found at: http://freeweb.pdq.net/fxc/four.htm Frank Cooper, Friendswood, Texas, USA ----- Original Message -----=20 From: Ed Ianni=20 To: psn-l@................. Sent: Sunday, January 14, 2001 10:54 AM Subject: small seismograph Does anyone have specifications for the mini mini seismograph? Thank you. Ed.
Hi Ed,
Sorry I did not give the complete url for John = Cole's web=20 page.  It can be found at:  http://freeweb.pdq.net/fxc/f= our.htm
Frank Cooper, Friendswood, Texas, USA
----- Original Message -----
From:=20 Ed = Ianni
Sent: Sunday, January 14, 2001 = 10:54=20 AM
Subject: small = seismograph

Does anyone have specifications = for the mini=20 mini seismograph?
Thank you.=20 Ed.
Subject: Small and yet smaller Seismographs From: "Danie Overbeek" danieo@............ Date: Mon, 15 Jan 2001 11:04:47 +0000 Hi I don't know what a mini-mini seismograph is but it cannot be smaller than the Wood-Anderson torsional seismometer which has a horizontal pendulum all of 6 millimetres long. The instrument was sold in kit form by the Sprengnether Instrument Company of St Louis. It was designed to record a trace on a drum wrapped in photographic paper but one could substitute an electronic optical transducer for the drum. See "The Amateur Scientist" by CL Stong, Heinemann, 1962, page 229. This is the book which started me off on seismography. If you cannot access the book then I'll be happy to quote a few paragraphs for psn. Cheers all Danie Overbeek. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Small and yet smaller Seismographs From: D Collins dcollin@........... Date: Mon, 15 Jan 2001 06:41:40 -0700 At 04:04 AM 1/15/01 , you wrote: >Hi > >I don't know what a mini-mini seismograph is but it cannot be >smaller than the Wood-Anderson torsional seismometer which has >a horizontal pendulum all of 6 millimetres long. The instrument >was sold in kit form by the Sprengnether Instrument Company of >St Louis. It was designed to record a trace on a drum wrapped >in photographic paper but one could substitute an electronic >optical transducer for the drum. See "The Amateur Scientist" >by CL Stong, Heinemann, 1962, page 229. This is the book >which started me off on seismography. If you cannot access >the book then I'll be happy to quote a few paragraphs for psn. > >Cheers all > >Danie Overbeek. THAT book started a lot of us on the path we are on now. Darrell __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Small and yet smaller Seismographs From: Thomas W Leiper twleiper@........ Date: Mon, 15 Jan 2001 10:06:25 -0500 On Mon, 15 Jan 2001 06:41:40 -0700 D Collins writes: > At 04:04 AM 1/15/01 , you wrote: > [edited] > > >This is the book which started me off on seismography. > > > >Cheers all > > > >Danie Overbeek. > > > THAT book started a lot of us on the path we are on now. > > Darrell > Yes, and that path must end in destruction, just as it was inevitable that Quint would be eaten by the shark that he pursued all his life, we will all probably be swallowed up by some fissure or incinerated in a lava flow. Goodby cruel world!! __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Small and yet smaller Seismographs From: "Ian Greenwood" judgedred@.............. Date: Mon, 15 Jan 2001 21:00:40 -0000 Subject: Small and yet smaller Seismographs > Hi See "The Amateur Scientist" > by CL Stong, Heinemann, 1962, page 229. This is the book > which started me off on seismography. If you cannot access > the book then I'll be happy to quote a few paragraphs for psn. > > Cheers all > > Danie Overbeek. Danie, A few paragraphs would be much appreciated!!! Thanks Ian __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Small and yet smaller Seismographs From: "Ian Greenwood" judgedred@.............. Date: Mon, 15 Jan 2001 21:04:06 -0000 "The Amateur Scientist" > >by CL Stong, Heinemann, 1962, page 229. This is the book > >which started me off on seismography. If you cannot access > >the book then I'll be happy to quote a few paragraphs for psn. > > > >Cheers all > > > >Danie Overbeek. > > > THAT book started a lot of us on the path we are on now. > > Darrell Good, because that book got the group going that got me started!!! Tectonic motion in action! Ian __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Small and yet smaller Seismographs From: "Ian Greenwood" judgedred@.............. Date: Mon, 15 Jan 2001 21:05:35 -0000 > Yes, and that path must end in destruction, just as it was > inevitable that Quint would be eaten by the shark that he > pursued all his life, we will all probably be swallowed up > by some fissure or incinerated in a lava flow. > > Goodby cruel world!! Public peSeismistic Network, or what? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Cruel world and Wood-Andersons From: sean@........... Date: Mon, 15 Jan 2001 15:37:11 -0600 (CST) Thomas, Darrell, Danie, Re: "Goodbye cruel ..."; of course we all know that seismographs attract earthquakes like lightning rods, so your chance of your wallet being swallowed by a fissure increases exponentially with your success at amateur seismology. (I have actually encountered this quake attraction thinking in trying to permit telemetry station sites in the Ozarks.) Regarding the Wood-Anderson torsional seismometer: I have operated several versions of this, including the original wooden box designs and the later compact refinements by Q.E.D. Early instruments were set to modest periods, with 2.7 seconds being common, but relatively unstable. Later a standard of 0.8 seconds and a magnification of 2800 was agreed on for a standard 60mm/min photographic record. Because its magnification is so low, real data was a rarity unless you were close to an active fault zone. But for larger quakes it was very useful for calculating the Richter magnitude, which was based on the instrument. Since they were horizontal sensors, we photo-recorded them on a triple- record drum along with a high gain 1 second vertical seismometer/galvanometer system. But photo-recording became costly and was complicated and relatively time consuming, so currently the W-As are adornments in a display case, and the W-A response can be derived from any broadband signal and scaled to any near-field magnitude. The original article by Anderson and Wood was published in the BSSA, vol 15, pp 1072, in 1925. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Small and yet smaller Seismographs From: "Ted Blank" ted@.......... Date: Mon, 15 Jan 2001 17:13:45 -0500 I have seen the C. L. Stong book in the library, it is wonderful and covers an enormous range of interests. My interest started from the Lehman article in 1979. When we get to predicting quakes, maybe we should call ourselves the Public Psi-smic Network... The masked appender __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Cruel world and Wood-Andersons From: John Hernlund hernlund@............ Date: Mon, 15 Jan 2001 15:03:19 -0800 sean@........... wrote: > Re: "Goodbye cruel ..."; of course we all know that seismographs attract > earthquakes like lightning rods, so your chance of your wallet being > swallowed by a fissure increases exponentially with your success at > amateur seismology. (I have actually encountered this quake attraction > thinking in trying to permit telemetry station sites in the Ozarks.) I have talked to my apartment manager in Santa Monica about setting up a seismograph (because it would require minor alteration of their property) and he said it would be great. He did, however, want some assurance that the thing wouldn't attract earthquakes! John Hernlund Department of Earth and Space Sciences University of California, Los Angeles hernlund@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Strong shock somewhere relatively nearby? From: John Hernlund hernlund@............ Date: Mon, 15 Jan 2001 15:12:10 -0800 Canie wrote: > No - its wrong - 1 4.3 at 6:26pm pst followed by a 4.1 at 6:50pm - I hope > these aren't foreshocks to something bigger! > > I'm in Long Beach and we did not feel them here but they were felt in Santa > Monica area. We didn't feel anything in Santa Monica...nor did our neighbors. The weird thing is that the Northridge quake sent strong energy into Santa Monica through what some people think is a lens-like structure under the Santa Monica Mountains. This quake looked close to Northridge, but no focusing of energy apparently occurred here this time. But, due to this proximity, I would guess that this may be some type of after affect of the Northridge quake rather that a foreshock....but I am not sure. John Hernlund Department of Earth and Space Sciences University of California, Los Angeles hernlund@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Cruel world and Wood-Andersons From: "Ted Blank" ted@.......... Date: Mon, 15 Jan 2001 18:30:56 -0500 Attract quakes? Just the opposite, tell him the best way to insure there won't be any quakes anywhere near him will be to let you set up the seismometer and keep it working. Anybody on this list knows quakes only happen when your station is down. Of course if the disk fills up or the ink runs dry, head for the hills, there's a quake on the way. Regards, Ted Blank __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Cruel world and Wood-Andersons From: macsmith macsmith@......... Date: Mon, 15 Jan 2001 15:15:53 -1000 when I used to run my machine with Microsoft Windows, it crashed often and there were frequent and co-incident local quakes. Since I converted to Linux there have been very few crashes or quakes! Perhaps everyone in psn should try Linux, it might make the world safer! ;-) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Cruel world and Wood-Andersons From: bc bruce@....... Date: Mon, 15 Jan 2001 20:26:03 -0500 Gosh, I wonder what would happen if you installed a seismometer in a trailer park? We could take up a pool to see which came first, the funnel or the quake. Bruce At 03:03 PM 01/15/2001 -0800, you wrote: >sean@........... wrote: > > > Re: "Goodbye cruel ..."; of course we all know that seismographs attract > > earthquakes like lightning rods, so your chance of your wallet being > > swallowed by a fissure increases exponentially with your success at > > amateur seismology. (I have actually encountered this quake attraction > > thinking in trying to permit telemetry station sites in the Ozarks.) > >I have talked to my apartment manager in Santa Monica about setting up >a seismograph (because it would require minor alteration of their >property) and he said it would be great. He did, however, want some >assurance that the thing wouldn't attract earthquakes! > > >John Hernlund >Department of Earth and Space Sciences >University of California, Los Angeles >hernlund@............ > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: station failures and quakes From: sean@........... Date: Mon, 15 Jan 2001 20:48:29 -0600 (CST) Ted, I agree from years of experience that "Mother knows" when a network is crippled, and that redundant systems secretly coordinate their failures. Only in the Aleutian network did we find that activity did not decrease after the summer maintenance and refurbishment effort, probably because we usually had 10 to 20 quakes per day. I had also interleaved the telemetry, microfilm, and tape channels to frustrate "Mother" so that a 50% channel loss would still leave us with 100% of the area coverage. If nothing else goes wrong, the best trained human will destroy the data, often because they are the most important scientist and not the guy who routinely handles the data, so they make a backup of the data on a non- existent server, ignore the complaints (they KNOW they are right) and then trash the original data by some very clever stupidity. Even in the days of photo-recording, the top geophysicist walked up the street to recover the records of the Good Friday Alaskan quake from the station under the gym, and on the way back to our processing darkroom, let the lid fall off the light-tight photo-record container. The press was all over the place, but all we had was very black records! There is more to the Ozark network story. We were doing a pre-impoundment study for a C.O.E. planned dam on the Meremac river that the voters finally killed (which was even more of a plus because the dam would have flooded the caverns where my CCM station now is.) We always try to get the interest and enthusiasm of our property owners in permitting station sites. But the scientific value of out study (we didn't openly connect it to the dam project) seems to have been lost on some of the locals in this area of dirt roads and hardwood forests. We had a few yagi antennas stolen because they looked like TV antennas, and we did recover one from the top of a house trailer. But when we went to remove the network, one station was completely missing, so we went to the landowners' cabin. It was all there on his porch; he claimed that he thought we had lost it. But when I went to pick it up, he stepped in and said it was his, and I would have to pay him a finders' fee. He wanted $100, but all I had was about $40, so he took it. After I loaded the equipment, I told him that if I had any problems with any other stations in the area, I would burn his cabin down, which is the ultimate threat in a feud in those parts. I know that the old boys in the area communicated fairly well, so we didn't have any further problems. At the time we were planning on re-occupying the same sites for post impoundment seismicity studies. We had a similar problem in Tadjikistan, were anything scientific "like" was associated with less-than-popular Moscow by the nomadic horsemen, who liked to lasso the yagi antenna (on a 3 m pipe mast) and drag it down. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: station failures and quakes From: BOB BARNS roybar@........ Date: Tue, 16 Jan 2001 10:18:54 -0500 Sean-Thomas-- Thanks for the interesting stories. You should consider writing a book about your experiences. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: 2 ebay items From: BOB BARNS roybar@........ Date: Tue, 16 Jan 2001 10:40:15 -0500 Hi gang, Ebay #542852319 is a "Taylor Instrument Seismometer". I have no idea what this is but the starting price is $10 and the auction ends 1/21. Ebay # 1404463168 is a book "Seismology & Plate Tectonics" by Gubbins, 1992 339 pages. The starting price is $15 and the auction ends 1/25. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 2 ebay items From: Doug Crice dcrice@............ Date: Tue, 16 Jan 2001 07:46:06 -0800 I monitor e-bay for seismographs. Approximately 90% of devices alleged to be "seismographs" (including this one) turn out to be meteorological recording instruments. Another 8% are chart recorders. It seems that the general public thinks anything with a chart recorder is a seismograph. Doug Crice BOB BARNS wrote: > > Hi gang, > Ebay #542852319 is a "Taylor Instrument Seismometer". I have no idea > what this is but the starting price is $10 and the auction ends 1/21. > Ebay # 1404463168 is a book "Seismology & Plate Tectonics" by Gubbins, > 1992 339 pages. The starting price is $15 and the auction ends 1/25. > Bob Barns > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 2 ebay items From: "John Tacinelli" John.Tacinelli@........ Date: Tue, 16 Jan 2001 10:15:06 -0600 I think that "seismograph" is a barograph for recording barometric = pressure. It has nothing to do with seismology. John Tacinelli Earth Science Instructor Rochester Community and Technical College __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: missing instructions From: "Ed Ianni" edwianni@........ Date: Wed, 17 Jan 2001 22:03:37 -0500 Would anyone out there know where I could get the instructions for a = "Perkin Elmer r 100 a" chart recorder? Thanks, Ed.
Would anyone out there know where I = could get the=20 instructions for a "Perkin Elmer r 100 a" chart recorder? Thanks,=20 Ed.
Subject: From: DMo6117771@....... Date: Thu, 18 Jan 2001 22:48:13 EST i am trying to use a geospace geophone to close set of contacts that initiates a radio transmission to a remote reciever. this thing needs to be adjustable in sensitivity or amplification in order for human footsteps to be the minimum neccessary to activate the contact closure. it must be dc in order to be used in the backwoods. any help or info would be greatly appreciated. Thanks, David __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: backwoods geophone From: "David Saum" DSaum@............ Date: Fri, 19 Jan 2001 08:36:24 -0500 > From: DMo6117771@....... > Date: Thu, 18 Jan 2001 22:48:13 EST > > i am trying to use a geospace geophone to close set of contacts that > initiates a radio transmission to a remote reciever. this thing needs to be > adjustable in sensitivity or amplification in order for human footsteps to be > the minimum neccessary to activate the contact closure. it must be dc in > order to be used in the backwoods. any help or info would be greatly > appreciated. So you want to detect people, but not quakes? Most of us have spent a lot of time designing our semismometers to do just the opposite! Sounds like a project I heard about during the Viet Nam war. It was a remote sensor that could be dropped on the Ho Chi Min trail and report back when people or vehicles came near. I may have some electronics that could be modified to solve your problem. I am working on an inexpensive seismic circuit (amp/filter/adc) that can run off a 9v battery. It is controlled by a PIC microprocessor that can do other processing. It draws less than 4.5ma, so a 9v nicad battery would last about 100 hours. Ciao, Dave > > Thanks, > David __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Footstep Detector From: Karl Cunningham karlc@.......... Date: Fri, 19 Jan 2001 13:51:56 -0800 Gateway Electronics has a $10 kit including a geophone and adjustable threshold detector that flashes an LED when it detects vibration. Using a relay instead of the LED, I think it would probably work for what you are doing. Their website is at http://www.gatewayelex.com I didn't see it on their website but I saw them in their store yesterday. Perhaps an email to them would do the trick. Regards, Karl At 10:48 PM 1/18/2001 EST, you wrote: >i am trying to use a geospace geophone to close set of contacts that >initiates a radio transmission to a remote reciever. this thing needs to be >adjustable in sensitivity or amplification in order for human footsteps to be >the minimum neccessary to activate the contact closure. it must be dc in >order to be used in the backwoods. any help or info would be greatly >appreciated. > >Thanks, >David >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Footstep Detector From: "Ian Greenwood" judgedred@.............. Date: Fri, 19 Jan 2001 22:28:49 -0000 http://www.gatewayelex.com/gadgets.htm will get the page Subject: Re: Footstep Detector __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: SDR Files to Audio (Wav) program From: Arie Verveer ajbv@............ Date: Sat, 20 Jan 2001 20:19:17 +0800 Hi, I have just, completed an upgrade to the program "SdrDrum". It now can generate audio (.wav) files with the ".GIF", heiplot image. If the user so requests. If you are interested please read the upgraded instructions and the program can be found at: (Click "Download PSN related Software" at the bottom of the page) http://www.iinet.net.au/~ajbv/ There is an amazing richness in sounds, from a thunder of a quake to the pop of the seismic waves bouncing from the core. The magnetic field has sounds resembling bird calls. Cheers Arie PS: read the instructions first. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: What Do you think From: "Bryan & Regina Goss" bgoss@.................. Date: Sun, 21 Jan 2001 19:18:33 -0600 Well I finally got my sight updated tell me what you all think. Just wandering if anyone else had used a Plexiglas box for a cover...... http://www.freedom2000net.com/userpages/bgoss/seis/index.htm
Well I finally got my sight updated = tell me what=20 you all think.
Just wandering if anyone else had used = a Plexiglas=20 box for a cover......
 
htt= p://www.freedom2000net.com/userpages/bgoss/seis/index.htm Subject: Re: What Do you think From: Angel Rodriguez angel@............ Date: Mon, 22 Jan 2001 17:09:33 -0500 Hello Bryan, Sunday, January 21, 2001, 8:18:33 PM, you wrote: BRG> Well I finally got my sight updated tell me what you all think. BRG> Just wandering if anyone else had used a Plexiglas box for a cover...... BRG> http://www.freedom2000net.com/userpages/bgoss/seis/index.htm Hi Bryan, I think you seismogaph looks great!! And the gif of the quake you got looks great too. Nice work!! -- Best regards, Angel mailto:angel@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay item...... ending an. 26th From: "Ed Ianni" edwianni@........ Date: Mon, 22 Jan 2001 18:34:27 -0500 There is a "dutch" auction on ebay for "earthquake = alarms".????????......... Item # 545650690.
There is a "dutch" auction on ebay for = "earthquake=20 alarms".????????......... Item # 545650690.
Subject: Re: What Do you think From: barry lotz gbl@....... Date: Mon, 22 Jan 2001 06:07:20 -0800 Hi Brian I like your photos also . One of these days I hope to share also. I currently use plexiglas for my lehman also. It has works well for me. I was previously getting condensation in the winter due to moisture coming thru my garage slab. I put a layer of plastic drop cloth under (the thinist I could find (0.5 mil)). It solved that problem. I also put a strip of weather stripping(sticky on one side) under the where the plastic contacts the concrete to help with slab irregularities.Looks like you have a slightly different arrangement which probably works as well. I am still concerned about the lack of emi shielding of my use of a plastic cover, but possibly the low pass filters take care of most of this ,since we look at very low(relatively speaking)frequencies. I have blown a few opamps due to lightning. I haven't incorporated circuit overloads for this problem yet. Regards Barry Bryan & Regina Goss wrote: > Well I finally got my sight updated tell me what you all think.Just > wandering if anyone else had used a Plexiglas box for a > cover...... http://www.freedom2000net.com/userpages/bgoss/seis/index.htm Hi Brian
   I like your photos also . One of these days I hope to share also. I currently use plexiglas for my lehman also. It has works well for me. I was previously getting condensation in the winter due to moisture coming thru my garage slab. I put a layer of plastic drop cloth under (the thinist I could find (0.5 mil)). It solved that  problem. I also put a strip of weather stripping(sticky on one side) under the where the plastic contacts the concrete to help with slab irregularities.Looks like you have a slightly different arrangement which probably works as well. I am still concerned about the lack of emi shielding of my use of a  plastic cover, but possibly the low pass filters take care of most of this ,since we look at very low(relatively speaking)frequencies. I have blown a few opamps due to lightning. I haven't incorporated circuit overloads for this problem yet.
Regards
Barry

Bryan & Regina Goss wrote:

Well I finally got my sight updated tell me what you all think.Just wandering if anyone else had used a Plexiglas box for a cover...... http://www.freedom2000net.com/userpages/bgoss/seis/index.htm
Subject: Re: What Do you think From: ChrisAtUpw@....... Date: Mon, 22 Jan 2001 22:36:41 EST In a message dated 22/01/01, bgoss@.................. writes: > Well I finally got my sight updated tell me what you all think. The results look OK, which is what counts. I see that you have used both magnetic and fluid damping. With the magnetic damping, you have used Al plate which is not nearly as effective as Cu and you have also used a very large magnetic gap. This suggests that your magnetic damping is a sort of 'add on' correction. The problem with fluid damping in general is the huge changes in fluid viscosity with temperature, particularly between summer and winter. If it works OK, don't 'fix' it. If you want to experiment at any time, I suggest you try a bit of 1/8" Copper plate, no fluid and reduce the magnet gap till you get ~critical damping. This will be independent of temperature. You might want at some stage to fit a small underrun lamp (1/2 to 2/3 rated voltage) inside the top of the box to give a stable temperature gradient to the internal air. A layer or two of bubble wrap with suitable viewing holes cut in it could provide additional insulation while still allowing light through. A layer of polythene damp proof sheeting under the whole apparatus could prevent any condensation problems from the flooring. If you get any problems with lightning where you are, you might consider mounting the amplifier on the baseplate and connecting the baseplates together with a common earth. For others still in the design stage, you can get threaded Brass and Stainless Steel rods, which are both non magnetic and so won't give problems with magnetic interactions. Another alternative is to get plain rod and have some thread put one end. Mounting the sensor system just inboard of the weight can give a more compact system. Socket cap screws can make levelling adjustments easier to perform and fine threads are available - it is a bit easier to get an extension rod into a hole than a flat screwdriver bit into a slot. What stable period did you manage to get? Good for you and Good Luck! Chris __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: What Do you think From: "Bryan & Regina Goss" bgoss@.................. Date: Mon, 22 Jan 2001 22:00:26 -0600 I was able to get about 17 seconds and it took about 2 hours, I almost settled for less. It seems to work great except the shop floor tilts a lot with temperature changes I must adjust every 3 to 5 days this is bothersome. Thank you for your suggestions I will use them I plan to build another one or two. ----- Original Message ----- From: To: Sent: Monday, January 22, 2001 9:36 PM Subject: Re: What Do you think > In a message dated 22/01/01, bgoss@.................. writes: > > > Well I finally got my sight updated tell me what you all think. > > The results look OK, which is what counts. > > I see that you have used both magnetic and fluid damping. With the > magnetic damping, you have used Al plate which is not nearly as effective as > Cu and you have also used a very large magnetic gap. This suggests that your > magnetic damping is a sort of 'add on' correction. The problem with fluid > damping in general is the huge changes in fluid viscosity with temperature, > particularly between summer and winter. If it works OK, don't 'fix' it. If > you want to experiment at any time, I suggest you try a bit of 1/8" Copper > plate, no fluid and reduce the magnet gap till you get ~critical damping. > This will be independent of temperature. > > You might want at some stage to fit a small underrun lamp (1/2 to 2/3 > rated voltage) inside the top of the box to give a stable temperature > gradient to the internal air. A layer or two of bubble wrap with suitable > viewing holes cut in it could provide additional insulation while still > allowing light through. A layer of polythene damp proof sheeting under the > whole apparatus could prevent any condensation problems from the flooring. If > you get any problems with lightning where you are, you might consider > mounting the amplifier on the baseplate and connecting the baseplates > together with a common earth. > > For others still in the design stage, you can get threaded Brass and > Stainless Steel rods, which are both non magnetic and so won't give problems > with magnetic interactions. Another alternative is to get plain rod and have > some thread put one end. Mounting the sensor system just inboard of the > weight can give a more compact system. Socket cap screws can make levelling > adjustments easier to perform and fine threads are available - it is a bit > easier to get an extension rod into a hole than a flat screwdriver bit into a > slot. > > What stable period did you manage to get? > > Good for you and Good Luck! > > Chris > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: missing instructions From: "George Harris" gjharris@............. Date: Tue, 23 Jan 2001 13:01:25 -0800 ----- Original Message -----=20 From: Ed Ianni=20 To: psn-l@................. Sent: Wednesday, January 17, 2001 7:03 PM Subject: missing instructions Would anyone out there know where I could get the instructions for a = "Perkin Elmer r 100 a" chart recorder? Thanks, Ed. Ed, I have a Perkin Elmer R50 recorder with a complete manual. The unit = is 13x17x5 inches. It has speed control from 10 mm/hr to 60 cm. per = minute. It uses paper 11 1/8 inch wide on a drum which is about 1.3 = inch diameter. If this is similar to your recorder, I may be able to = help. The manual has about 60 pages. =20 George Harris gjharris@.............
 
----- Original Message -----
From:=20 Ed = Ianni
Sent: Wednesday, January 17, = 2001 7:03=20 PM
Subject: missing = instructions

Would anyone out there know where I = could get the=20 instructions for a "Perkin Elmer r 100 a" chart recorder? Thanks,=20 Ed.
 
Ed,
 
I have a Perkin Elmer R50 recorder = with a=20 complete manual.  The unit is = 13x17x5=20 inches.  It has speed control from 10 mm/hr to 60 cm. per = minute. =20 It uses paper 11 1/8 inch wide on a drum which is about 1.3 inch=20 diameter.  If this is similar to your recorder, I may be able to = help.=20 The manual has about 60 pages. 
 
George Harris
gjharris@.............<= /DIV> Subject: help-me From: agustri agustri@......... Date: Thu, 25 Jan 2001 08:57:35 +0700 Help me, I am not yet clear about the difference of 1.displacementmeter, velocitymeter and accelerometer also 2.shortperiod, longperiod and broadband seismometer, Tanks for your kindness. Regards, Agus Tri Sutanto, MGA, Indonesia __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: QUAKE??? From: "Bryan & Regina Goss" bgoss@.................. Date: Thu, 25 Jan 2001 21:17:58 -0600 Local small quake near me in Mississippi something went by at about 3:10 = UTC it seemed small but close????
Local small quake near me in = Mississippi something=20 went by at about 3:10 UTC it seemed small but=20 close????
Subject: East Coast - Lake Erie Quake From: Brian Zimmerman bzimmerman@............ Date: Thu, 25 Jan 2001 22:47:08 -0500 We just had a felt quake on the South Shore of Lake Erie. I'm quessing M 3-4 anyone else get it ? This will be big news here. Brian Zimmerman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: help-me From: ChrisAtUpw@....... Date: Thu, 25 Jan 2001 22:41:45 EST In a message dated 25/01/01, agustri@......... writes: > I am not yet clear about the difference of > 1.displacementmeter, velocitymeter and accelerometer also > 2.shortperiod, longperiod and broadband seismometer, Hello Agus Tri Sutanto, Consider a weight on the end of a very long pendulum. When an earthquake happens, the ground will move a certain distance while the pendulum weight stays nearly still. Measuring this will give the displacement, usually measured in microns. If, instead of measuring the displacement, you use a coil of wire on the ground and put a magnet on the weight, you will get a signal which depends on the rate of movement of the ground - it's velocity. If you connected the weight to the ground with a 'load cell', which measures force, the weight will now have to follow the ground movement and you will get an output which is proportional to the acceleration of the ground. In a simple system like the pendulum, it will tend to have one particular frequency or period at which it oscillates naturally, like in a clock. Now we want to measure the ground movements, not the oscillation of a pendulum, so the movement is 'damped', maybe by putting a paddle on the weight and letting it dip into a container filled with oil, resting on the ground. The weight can still move, but if you give it a light push, it deflects a small distance and then moves back to the original position, but not past it. The name short, or long, period seismometer refers to the natural period of the apparatus when it is not damped. A Shakleford-Gunderson seismometer may have a period of less than a second and this would be called short. The popular Lehman seismometer may have a period of 10 to 20 seconds and this would be called long. The response of a damped seismometer changes at the natural oscillation frequency, but there is no peak output at any particular frequency. A broad band seismometer is constructed so that it gives a output which does not depend on the frequency of the earthquake signal over quite a wide range. Obviously there are both upper and lower frequency limits to the behavoir. Prof. Erhard Weilandt of the University of Stuttgart has written a very full account in his paper "Seismic Sensors and their Calibration", which is available on-line at We just had a felt quake on the South Shore of Lake Erie. I'm quessing M >3-4 anyone else get it ? > >This will be big news here. > >Brian Zimmerman John C. Lahr 1925 Foothills Road Golden, CO 80402 (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: East Coast - Lake Erie Quake From: "D. Hill" n0ssy@......... Date: Fri, 26 Jan 2001 04:08:02 +0000 Receiving a nice seismogram here in Denver. Dewayne __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: QUAKE??? From: "Don Wheeler" wheelwx@........... Date: Thu, 25 Jan 2001 22:17:54 -0600 Where in Mississippi are you located? I'm just north of Monroe, LA. I'll check to see if I got anything. >From: "Bryan & Regina Goss" >Reply-To: psn-l@.............. >To: >Subject: QUAKE??? >Date: Thu, 25 Jan 2001 21:17:58 -0600 > >Local small quake near me in Mississippi something went by at about 3:10 >UTC it seemed small but close???? _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: QUAKE??? From: "Bryan & Regina Goss" bgoss@.................. Date: Thu, 25 Jan 2001 22:22:23 -0600 I am in the northeast corner of the state in Corinth, about 50 miles north of Tupelo. Thanks!!! ----- Original Message ----- From: Don Wheeler To: Sent: Thursday, January 25, 2001 10:17 PM Subject: Re: QUAKE??? > Where in Mississippi are you located? I'm just north of Monroe, LA. I'll > check to see if I got anything. > > > >From: "Bryan & Regina Goss" > >Reply-To: psn-l@.............. > >To: > >Subject: QUAKE??? > >Date: Thu, 25 Jan 2001 21:17:58 -0600 > > > >Local small quake near me in Mississippi something went by at about 3:10 > >UTC it seemed small but close???? > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: East Coast - Lake Erie Quake From: The Lahrs johnjan@........ Date: Thu, 25 Jan 2001 21:27:52 -0700 NEIC located the event near Ashtabula, Ohio. 01/01/26 03:03:19 41.99N 80.83W 5.0 4.2Lg A OHIO http://neic.usgs.gov/neis/bulletin/ John At 09:08 PM 1/25/2001 , you wrote: >Receiving a nice seismogram here in Denver. > >Dewayne >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. * John C. and Jan H. Lahr *JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * (303) 215-9913 * http://lahr.org/john-jan __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Another quake From: "Larry Conklin" lconklin@............ Date: Thu, 25 Jan 2001 23:35:45 -0500 There is something else going on that is a heck of a lot bigger than the Ohio quake, but apparently much farther away. I have been getting a very strong signal for about an hour here in central NY. Larry Conklin lconklin@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Another quake From: Seisguy@....... Date: Thu, 25 Jan 2001 23:37:18 EST In a message dated 1/25/01 8:36:29 PM Pacific Standard Time, lconklin@............ writes: > There is something else going on that is a heck of a lot bigger than the > Something big just happened in India... In a message dated 1/25/01 8:36:29 PM Pacific Standard Time,
lconklin@............ writes:


There is something else going on that is a heck of a lot bigger than the
Ohio quake, but apparently much farther away.


Something big just happened in India...
Subject: Re: East Coast - Lake Erie Quake From: "bobshannon.org" earth@........... Date: Thu, 25 Jan 2001 20:37:30 -0800 ----- Original Message ----- From: Brian Zimmerman To: Sent: Thursday, January 25, 2001 7:47 PM Subject: East Coast - Lake Erie Quake > > > We just had a felt quake on the South Shore of Lake Erie. I'm quessing M 3-4 anyone else get it ? > > This will be big news here.more information. If this is true and holds I would appreciate all input for my Pinpoint subscribers as well as ELFRAD who is monitoring eastern quakes very closely this last few days... I do NOT represent ELFRAD..I am only a reader, but I am owner of Pinpoint since 1992 Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: East Coast - Lake Erie Quake From: Seisguy@....... Date: Thu, 25 Jan 2001 23:41:05 EST Strong quake felt most strongly in western India NEW DELHI, Jan 26 (Reuters) - Residents in western and northern India felt strong tremors for about 30 seconds on Friday. There was no word on casualties or damage. A meteorological department official in New Delhi said there had been an earthquake, but said he needed 10 minutes to confirm the epicentre and intensity. People in the western state of Gujarat, which is prone to earthquakes of up to seven on the open-ended Richter scale, said they felt the tremor very strongly. "The building shook so much that it developed cracks," said Vinay Kumar, who works for Gujarat Petroleum Corp. "It was like being on a swing. Nobody could get out for those 20 or 30 seconds." Residents in New Delhi said buildings swayed and furniture moved about from about 8:50 a.m. (0320 GMT). Many people ran out of their houses into the street. The quake was also felt in Bombay, which is around 1,400 km (875 miles) from the capital. "It was quite gentle," said a Bombay resident. "It lasted about two minutes. I felt the dressing-table shaking and the bed as well." The last major earthquake to hit India was in March 1999. Measuring 6.8 on the Richter scale, the quake and its aftershocks killed 100 people and injured 300 in the Himalayan foothills and was felt across many parts of northern India, western Nepal and southern China. 23:04 01-25-01 Strong quake felt most strongly in western India

 
NEW DELHI, Jan 26 (Reuters) - Residents in western and northern India felt
strong tremors for about 30 seconds on Friday.

There was no word on casualties or damage.

A meteorological department official in New Delhi said there had been an
earthquake, but said he needed 10 minutes to confirm the epicentre and
intensity.

People in the western state of Gujarat, which is prone to earthquakes of up
to seven on the open-ended Richter scale, said they felt the tremor very
strongly.

"The building shook so much that it developed cracks," said Vinay Kumar, who
works for Gujarat Petroleum Corp. "It was like being on a swing. Nobody could
get out for those 20 or 30 seconds."

Residents in New Delhi said buildings swayed and furniture moved about from
about 8:50 a.m. (0320 GMT). Many people ran out of their houses into the
street.

The quake was also felt in Bombay, which is around 1,400 km (875 miles) from
the capital.

"It was quite gentle," said a Bombay resident. "It lasted about two minutes.
I felt the dressing-table shaking and the bed as well."

The last major earthquake to hit India was in March 1999. Measuring 6.8 on
the Richter scale, the quake and its aftershocks killed 100 people and
injured 300 in the Himalayan foothills and was felt across many parts of
northern India, western Nepal and southern China.

23:04 01-25-01
Subject: Another bigger quake somewhere... From: "meredith lamb" mlamb1@.......... Date: Thu, 25 Jan 2001 21:42:41 -0800 Hi all, Getting bigger surface waves at ~04:35, from somewhere, and it wouldn't be the mag 4.2 quake. Unless.....its a bigger shock in that area??? Meredith Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: East Coast - Rueters From: Seisguy@....... Date: Thu, 25 Jan 2001 23:42:53 EST Minor earthquake reported in northeastern Ohio GOLDEN, Co., Jan 25 (Reuters) - A minor earthquake with a magnitude of 4.2 shook northeastern Ohio on Thursday evening, and tremors were felt as far away as Toronto, Canada, a spokesman for the U.S. Geological Survey said. The quake occurred at about 10 p.m. EST (0300 GMT) and its epicenter was recorded 10 miles (16 kms) north-northeast of Ashtabula, Ohio, said Bruce Presgrave of the agency's National Earthquake Information Center. He predicted little if any damage, given the relatively low preliminary magnitude measurement, but said the quake was felt in Erie, Pennsylvania and Toronto. 23:41 01-25-01 Minor earthquake reported in northeastern Ohio

 
GOLDEN, Co., Jan 25 (Reuters) - A minor earthquake with a magnitude of 4.2
shook northeastern Ohio on Thursday evening, and tremors were felt as far
away as Toronto, Canada, a spokesman for the U.S. Geological Survey said.

The quake occurred at about 10 p.m. EST (0300 GMT) and its epicenter was
recorded 10 miles (16 kms) north-northeast of Ashtabula, Ohio, said Bruce
Presgrave of the agency's National Earthquake Information Center.

He predicted little if any damage, given the relatively low preliminary
magnitude measurement, but said the quake was felt in Erie, Pennsylvania and
Toronto.

23:41 01-25-01
Subject: 6.5 Pakistan quake From: "Frank Cooper" fxc@....... Date: Thu, 25 Jan 2001 23:01:36 -0600 Red Puma reports a 6.5 in Pakistan at 03:16:51, 1/26. It is still = clipping the chart recorder here. Frank Cooper, Friendswood, Texas
Red Puma reports a 6.5 in Pakistan at 03:16:51, = 1/26.  It=20 is still clipping the chart recorder here.
Frank Cooper, Friendswood, Texas
 
 
Subject: Re: 6.5 Pakistan quake From: "Don Wheeler" wheelwx@........... Date: Thu, 25 Jan 2001 23:18:03 -0600 Alaska Tsunami Center reported a prelim. of 8.3. Feel this is a bit too high. My recorders just stopped clipping but still getting strong waves. TSUNAMI BULLETIN NUMBER 1 WEST COAST AND ALASKA TSUNAMI WARNING CENTER/NOAA/NWS ISSUED JAN 26 AT 0353 UTC ....THIS IS A TSUNAMI INFORMATION BULLETIN FOR ALASKA, BRITISH COLUMBIA, WASHINGTON, OREGON, AND CALIFORNIA ONLY... NO, REPEAT NO, WATCH OR WARNING IS IN EFFECT. AN EARTHQUAKE, PRELIMINARY MAGNITUDE 8.3, OCCURRED AT 1817 AST ON JAN 25, OR 1917 PST ON JAN 25, OR 0317 UTC ON JAN 26. THE EARTHQUAKE WAS LOCATED IN THE GENERAL AREA OF: SOUTHERN INDIA NEAR 23.6N, 70.2E. EVALUATION: BASED ON LOCATION AND MAGNITUDE THE EARTHQUAKE WAS NOT SUFFICIENT TO GENERATE A TSUNAMI DAMAGING TO CALIFORNIA, OREGON, WASHINGTON, BRITISH COLUMBIA OR ALASKA. SOME AREAS MAY EXPERIENCE SMALL SEA LEVEL FLUCTUATIONS. IN AREAS OF INTENSE SHAKING, LOCALLY GENERATED TSUNAMIS CAN BE TRIGGERED BY SLUMPING. THIS WILL BE THE ONLY BULLETIN ISSUED FOR THIS EVENT BY THE WEST COAST AND ALASKA TSUNAMI WARNING CENTER UNLESS CONDITIONS WARRANT.IF AVAILABLE, REFER TO THE INTERNET SITE HTTP://WCATWC.GOV FOR MORE INFORMATION. >From: "Frank Cooper" >Reply-To: psn-l@.............. >To: >Subject: 6.5 Pakistan quake >Date: Thu, 25 Jan 2001 23:01:36 -0600 > >Red Puma reports a 6.5 in Pakistan at 03:16:51, 1/26. It is still clipping >the chart recorder here. >Frank Cooper, Friendswood, Texas > > _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: East Coast - Lake Erie Quake From: Stephen & Kathy mortskm@....... Date: Thu, 25 Jan 2001 20:30:33 -0800 You may be recording the large event from India, Pakistan region. I started recording it about 03:35:44 UTC Jan 26,,,, I'm now recording the surface waves. It is about 8,000 miles from my station,, it is going to be well over a 7 mag!! Stephen PSN Station #55 near Pilot Hill Ca 38.828N 120.979W "D. Hill" wrote: > Receiving a nice seismogram here in Denver. > > Dewayne > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: BIG QUAKE ! From: "I.ES.N." info@........ Date: Fri, 26 Jan 2001 06:58:46 +0100 just terminated now the record of a very big quake Preliminary location INDIA-PAKISTAN BORDER REGION Ms 7.6 / 7.8 or more....!!!!!!! No report yet by international agencies Francesco Italy __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: MS7.9 SOUTHERN INDIA From: "Frank Cooper" fxc@....... Date: Fri, 26 Jan 2001 00:16:46 -0600 USGS has now posted a Ms7.9, SOUTHERN INDIA, 01/26/01, 03:16:41 Frank Cooper, Friendswood, Texas, USA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 6.5 Pakistan quake - Ohio Quake From: Brian Zimmerman bzimmerman@............ Date: Fri, 26 Jan 2001 01:31:16 -0500 Things are slow in the Lake Erie snow-belt in January. A M4.2 is big news. So far I've been live on all 3 local news shows and interviewed by 2 papers. While the news crews were filming, the surface waves from Pakistan were coming through. Thanks to everyone out there on the PSN I had a suspicion that there was a large quake somewhere else and did not embarrass myself by assigning these large surface waves to the local event. There was no way you were all recording our little quake. Even less possible that the surface waves were local. The last news crew got to film what looks to be the first after-shock at approximately 05:40. Can't remember when I have had this much fun Brian Zimmerman Edinboro University of PA -----Original Message----- From: Frank Cooper [SMTP:fxc@........ Sent: Friday, January 26, 2001 12:02 AM To: psn-l@.............. Subject: 6.5 Pakistan quake << File: ATT00002.html >> Red Puma reports a 6.5 in Pakistan at 03:16:51, 1/26. It is still clipping the chart recorder here. Frank Cooper, Friendswood, Texas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: MS7.9 SOUTHERN INDIA From: Brian Zimmerman bzimmerman@............ Date: Fri, 26 Jan 2001 01:34:08 -0500 After posting my last message I received the latest on the larger quake. Sitting here in the middle of a plate we forget how dangerous these things are. Hope it was in a remote area. BZ -----Original Message----- From: Frank Cooper [SMTP:fxc@........ Sent: Friday, January 26, 2001 1:17 AM To: psn-l@.............. Subject: MS7.9 SOUTHERN INDIA USGS has now posted a Ms7.9, SOUTHERN INDIA, 01/26/01, 03:16:41 Frank Cooper, Friendswood, Texas, USA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: BIG QUAKE ! From: "Dennis Epperly" seaarch@...... Date: Thu, 25 Jan 2001 21:35:53 -0900 Hello from Alaska. I live on Cook Inlet which one side has the Alaska Range which has several active volcanoes, three of which have erupted in the last 15 years. From my home I can see three active volcanoes. We had a 5.0 quake last night 8:30 P.M. 30 miles due west from my house with a depth of 47 miles. It was a short quick one couple of little vibrations the three big jolts. Our area here is in constant motion with a subduction zone running up from the Aleutian trench into Cook Inlet were it meets the pacific, west coast fracture zone. Our activity has increased down by Kodiak Island which is on the east side of the subduction zone with about five volcanoes on the west side which includes Katmi, which had the second largest volcanic eruption in our recorded history. When Katmi went off if the eruption was in New York you would of been able to hear it in Chicago. I'm thinking that a volcano is working it's way to the surface on the south end of Kodiak Island, because of the number of quakes in that area in the last year, or so with a couple of quakes in the upper 7 range. I hiked into the Katmi area and took photos of the vent< nova eruptus, which was on the valley floor several thousand feet from the summit of Katmi caldera. The vent is now plugged with a lava plug which is hot and steams. I'm sending a photo of the lava dome, side view with the valley below which is still desolate by the eruption almost 100 years ago. Thanks for your time Dennis ----- Original Message ----- From: "I.ES.N." To: "PSN" Sent: Thursday, January 25, 2001 8:58 PM Subject: BIG QUAKE ! > just terminated now the record of a very big quake > Preliminary location INDIA-PAKISTAN BORDER REGION > Ms 7.6 / 7.8 or more....!!!!!!! > No report yet by international agencies > > > Francesco Italy > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. Subject: earthquake updates From: "Ed Ianni" edwianni@........ Date: Fri, 26 Jan 2001 01:46:48 -0500 If anyone has Netropa internet receiver (it's free at the netropa = website)... it is reporting on these earthquakes now (and does = continuously) with a map, etc. Ed.
If anyone has Netropa internet receiver = (it's free=20 at the netropa website)... it is reporting on these earthquakes now (and = does=20 continuously) with a map, etc. Ed.
Subject: Sending attachments. Please read. From: "Larry Cochrane" cochrane@.............. Date: Fri, 26 Jan 2001 00:17:56 -0800 All, Please do not send attachments to the list. If you have a file you would like to share with the group please place it on a server somewhere and send us the link to the location of the file. Thanks, Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: BIG QUAKE ! From: The Lahrs johnjan@........ Date: Fri, 26 Jan 2001 04:19:46 -0700 Hi Dennis, Great photograph! There is probably no direct connection between the 4 large events that occurred near southern Kodiak Island and any of the volcanoes in the region. Three of the four occurred within the subducted Pacific plate and were due to stretching of the plate as it is pulled into the mantle. The most recent one was on the thrust boundary between the underthrusting Pacific plate and the overriding North American plate. All of these events are indicative of continued subduction, which is the process that leads to volcanism, but they are not directly related to any particular future eruption. You're certainly living in a hot spot for big earthquakes, so take every precaution. Cheers, John At 11:35 PM 1/25/2001 , you wrote: >Hello from Alaska. I live on Cook Inlet which one side has the Alaska Range >which has several active volcanoes, three of which have erupted in the last >15 years. ... * John C. and Jan H. Lahr *JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * (303) 215-9913 * http://lahr.org/john-jan __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Tsunami list server From: "D. Hill" n0ssy@......... Date: Fri, 26 Jan 2001 14:16:49 +0000 Can someone tell me where I can subscribe to a Tsunami list server? Dewayne __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: India Quake From: Jeff Batten jeff.batten@........ Date: Fri, 26 Jan 2001 11:46:56 -0800 Hello, Where can I find a web site that has specific info on the quake. Fault Rupture Length Accelerations Thanks Jeff __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: India Quake From: The Lahrs johnjan@........ Date: Fri, 26 Jan 2001 20:46:49 -0700 Hi Jeff, The USGS has this page with information: http://neic.usgs.gov/neis/eqhaz/010126.html but I think it's too early for the specific information you are looking for. John At 12:46 PM 1/26/2001 , you wrote: >Hello, > >Where can I find a web site that has specific info on the quake. > >Fault >Rupture Length >Accelerations > > >Thanks > >Jeff John C. Lahr lahr@........ (work) john@........ (home) Central Region Geologic Hazards Team U.S. Geological Survey PO Box 25046 Denver, CO 80225 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: India Quake From: BOB BARNS roybar@........ Date: Sat, 27 Jan 2001 09:24:03 -0500 John, I looked at the "Live web camera" on the site given below. For the station NEW, 12 heliocorders are shown (labeled short period vertical). Why 12 drums for short period vertical? Why make recordings on paper? Bob Barns The Lahrs wrote: > > Hi Jeff, > > The USGS has this page with information: > http://neic.usgs.gov/neis/eqhaz/010126.html > > but I think it's too early for the specific information > you are looking for. > > John > > At 12:46 PM 1/26/2001 , you wrote: > > >Hello, > > > >Where can I find a web site that has specific info on the quake. > > > >Fault > >Rupture Length > >Accelerations > > > > > >Thanks > > > >Jeff > > John C. Lahr > lahr@........ (work) > john@........ (home) > > Central Region Geologic Hazards Team > U.S. Geological Survey > PO Box 25046 > Denver, CO 80225 > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: If you felt the quake it was scary From: Stacey Martin 9point1@....... Date: 27 Jan 2001 22:09:23 IST Hi, I wish I could have set up my PSN station, but I haven't and have th= us missed the biggest quake we've had in 50 years. I did feel it though and = that was scary enough. I'm roughly 725 kilometers SE of the epicentre. I was o= n my computer at the time (about 8:50am IST) and though I was feeling guidy. T= hen the curtains and things around began to gently swing. It wasn't a fast jerking, but more of a a relatively slow side-to-side shaking. I immediat= ely ran into a doorframe and from there watched in awe as the water in my aqu= arium began to slosh back and forth !!!!! It lasted around 20 seconds. I then r= an into the balcony and saw my windchimes still winging and in the opposite apartment building, on the 4th floor, a suspended lamp was swinging back = and forth, in an east-west direction. At the time I was too excited and calle= d up a few friends who hadn't felt a thing. Then I called up my aunt in Mumbai= and she too didn't feel it. but she called back a few minutes later and said someone in Bandra (a mumbai suburb) had felt it. The news got it within 2= 0 minutes. Lots of people from my apartment building are from Gujarat and s= o are many of my friends. One of my friends is from Surat one of the affected cities, but thankfully she and her family are ok. So was my dad's boss wh= o missed the train to Ahmedabad, due to a booking error. He was to go on th= e 25th but the ticket was booked for the 26th by the agent. = I know the mailing list is for other technical stuff, but hey this was ba= d and its getting worse by the hour. First time a big quake has struck major ci= ties in India. While I'm writing this the number of dead is 13,000. Some of th= e stories and pictures are nighmarish, ghastly and gut wrenching. This trul= y was a bad 26th January for us, I guess we could call it the Great Republic Da= y Earthquake. Stacey Martin ASC - Amateur Seismic Centre http://www.ascindia.org/ ____________________________________________________________________ Get free email and a permanent address at http://www.netaddress.com/?N=3D= 1 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: [India Quake] From: Stacey Martin 9point1@....... Date: 27 Jan 2001 22:16:10 IST this fault was the Allah bund fault that caused the 1819 quake. Shaking lasted between 20 seconds to 2 minutes so I'm making taking wild guess, that the rupture was anywhere between 100 - 200 kilometers. = Heck the shaking was felt thoughout South Asia, as far as Chennai !! = This site is from the IMD = http://www.imd.ernet.in/ The ASC also has some info, but we are still working on it as this event develops. http://www.ascindia.org/ Times of India http://www.timesofindia.com/ http://www.123india.com/ http://www.indya.com/ http://www.indian-express.com/ Geological Survey of India http://www.gsi.com/ As for wave form data, dunnno any, except for your PSN fellas and I think= the USGS and the IRIS. Stacey Martin ASC - Amateur Seismic Centre http://www.ascindia.org/ ____________________________________________________________________ Get free email and a permanent address at http://www.netaddress.com/?N=3D= 1 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: If you felt the quake it was scary From: The Lahrs johnjan@........ Date: Sat, 27 Jan 2001 16:44:25 -0700 Stacey, Thanks for the news and links. It's a terrible tragedy when so many people are killed in an earthquake. This scene will be repeated somewhere in the world until building are built strong enough to withstand strong shaking. The price (an extra 10% I understand) may seem like a lot when a building is being built, but after an earthquake it seems like a small price to pay for so many lives. Yours, John At 09:39 AM 1/27/2001 , you wrote: >Hi, > I wish I could have set up my PSN station, but I haven't and have thus >missed the biggest quake we've had in 50 years. I did feel it though and >that... John C. Lahr 1925 Foothills Road Golden, CO 80402 (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: If you feel a quake.... From: ChrisAtUpw@....... Date: Sat, 27 Jan 2001 22:55:57 EST Getting earthquake resistant buildings is obviously a very desirable long term objective. However, what government can afford to rebuild all it's inadequate towns and what strength of earthquake would you design for? A M 7.9 is pretty energetic, rebuilding takes a long time and could you guarantee that the ceiling won't collapse and that furniture won't fall over? A similar situation was faced in the UK during WW II, with the prospect of many deaths from collapsing buildings during bombing. Many houses bought / were given 'shelter tables' for some protection. These consisted of a rectangular box of heavy steel girders, about 6 ft x 4 ft x 2.5 ft high, topped with overlapping sheets of ~1/4" steel. The bottom, sides and one end were covered with heavy gauge protective wire mesh. The structure was delivered in pieces, bolted together in the living room and it was used as the family table, for meals etc. They did give fairly effective protection. I wondered if this sort of device had been considered as a 'bolt hole' in earthquake prone areas? While you might not have time to run out of the building during a 'quake, even if you can stay on your feet, diving under the living room table should only take a few seconds. It would not be very expensive and could be produced in large numbers quite quickly. Sorry if this is a bit 'off our usual topics'. We seem to have had so many tragedies during the last year, so I thought that I would see what others thought of the idea. Regards, Chris Chapman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: If you feel a quake.... From: The Lahrs johnjan@........ Date: Sat, 27 Jan 2001 20:42:14 -0700 Hi Chris, In the recent Turkey earthquake many of the buildings that collapsed were built recently to accommodate a large influx of people into the cities. The construction quality was poor. I think the steel box idea is a good one, at least for some situations. I don't think it would help many people in the 10+ story concrete buildings that totally collapse, however. The reality is that at the world becomes more and more populated (overpopulated, in fact) the value of a human life is bound to decrease, sad as that fact may be. (Larry, chime in if you think this thread should move off line!) John At 08:55 PM 1/27/2001, Chris wrote: > Getting earthquake resistant buildings is obviously a very desirable > long >term objective. However, * John C. and Jan H. Lahr *JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * (303) 215-9913 * http://lahr.org/john-jan __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Burr-Brown ADS7807 A/D chips - help! From: "Larry Cochrane" cochrane@.............. Date: Sun, 28 Jan 2001 00:15:15 -0800 Greetings, If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please let me know. As most of you know I sell an A/D card that a lot of the PSN stations use to record data. I placed an order for more chips back in November. I'm now hearing from my distributor that Burr-Brown won't be shipping more until April or maybe later. When I placed my order the lead time as this month. Needless to say I'm really upset (there are better word, but I won't use them) with Burr-Brown. At this point their right up there on my hate list with PG&E and our politicians who got us in the power problem... As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I can ship boards with them in it and have the user upgrade later when / if I get more. Let me know if you can help out. Thanks, Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Burr-Brown ADS7807 A/D chips - help! From: Greg Campbell geonerd@........... Date: Sun, 28 Jan 2001 01:48:34 -0800 Greetings, Larry and PSN groupies. I've got a few slightly used surface mount package chips I've rescued from the engineering trash bin at work. Can you use them? I've been meaning to get one of your boards. What's your price for a unit w/o an A/D? Do you offer them in kit form? (I'd like to build my own if it will save a few $$$) I've also procured about a dozen 3 axis accelerometers that were to be used in the oil well survey tools I maintain. These units have various problems at high temp (125C and up) and are unusable for our probes. However, they work fine at room temp. Sensitivity threshold is <0.1 mG from DC to ~300 Hz. I don't know exactly what the rolloff curve looks like, but by 1KHz the party's just about over. They need a _clean_ +/- 12V supply and will produce +/- 0.6v at 1 G. When powered with a good supply, the noise floor is well below 0.1 mG. These accels use a pickoff sensing active feedback loop to 'fly' a pendulum mass at a nearly static position. Since the pendulum/pickoff assembly pivots on (jewel) bearings, there is always a small amount of friction at in the system. This 'sticktion' blocks near-zero response a bit, limiting initial response to acceleration below about 0.3mG, depending on the individual unit. The problem is most pronounced immediately after the tool has been powered up. Once things start shaking, the pivot and bearings settle down and the problem largely goes away. Rotating the accel so that each channel is at a non-zero orientation will also help. After talking with the company VP, I have a tentative "go-ahead" to let these guys loose as strong motion sensors. If any PSN members are interested, let me know. For a few $ S/H, I'll send you one. I do ask that you be discreet regarding these units. While the VP may give me a wink and nod, the company owner (Scrooge come to life) would likely frown on my "giving away company hardware." I'll have a final talk with the VP. I suspect we may require you guys to ink a non-disclosure type document. -Greg Larry Cochrane wrote: > > Greetings, > > If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please > let me know. As most of you know I sell an A/D card that a lot of the PSN > stations use to record data. I placed an order for more chips back in > November. I'm now hearing from my distributor that Burr-Brown won't be > shipping more until April or maybe later. When I placed my order the lead > time as this month. Needless to say I'm really upset (there are better word, > but I won't use them) with Burr-Brown. At this point their right up there > on my hate list with PG&E and our politicians who got us in the power > problem... > > As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I > can ship boards with them in it and have the user upgrade later when / if I > get more. Let me know if you can help out. > > Thanks, > > Larry Cochrane > Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: R: Burr-Brown ADS7807 A/D chips - help! From: "Giovanni Rotta" rottag@.......... Date: Sun, 28 Jan 2001 12:20:55 +0100 Sorry, Larry ! I can't help you ! Greetings, giovanni ----- Original Message ----- From: Larry Cochrane To: Sent: Sunday, January 28, 2001 9:15 AM Subject: Burr-Brown ADS7807 A/D chips - help! > Greetings, > > If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please > let me know. As most of you know I sell an A/D card that a lot of the PSN > stations use to record data. I placed an order for more chips back in > November. I'm now hearing from my distributor that Burr-Brown won't be > shipping more until April or maybe later. When I placed my order the lead > time as this month. Needless to say I'm really upset (there are better word, > but I won't use them) with Burr-Brown. At this point their right up there > on my hate list with PG&E and our politicians who got us in the power > problem... > > As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I > can ship boards with them in it and have the user upgrade later when / if I > get more. Let me know if you can help out. > > Thanks, > > Larry Cochrane > Redwood City, PSN > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Burr-Brown ADS7807 A/D chips - help! From: Mariotti Mauro mariottim@............ Date: Sun, 28 Jan 2001 13:37:37 +0100 I use ADS7825 for my A/D card. I'm still waiting for them from August! They told me that will be shipped at the end of this month. I hope. But for your ADS7807 i'll ask to my distributor if he have any.. At 00:15 28/01/2001 -0800, you wrote: >Greetings, > >If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please >let me know. As most of you know I sell an A/D card that a lot of the PSN >stations use to record data. I placed an order for more chips back in >November. I'm now hearing from my distributor that Burr-Brown won't be >shipping more until April or maybe later. When I placed my order the lead >time as this month. Needless to say I'm really upset (there are better word, >but I won't use them) with Burr-Brown. At this point their right up there >on my hate list with PG&E and our politicians who got us in the power >problem... > >As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I >can ship boards with them in it and have the user upgrade later when / if I >get more. Let me know if you can help out. > >Thanks, > >Larry Cochrane >Redwood City, PSN > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Burr-Brown ADS7807 A/D chips - help! From: Bob Smith bobsmith5@........ Date: Sun, 28 Jan 2001 08:28:06 -0500 Larry -- If my memory serves me correctly, B-B was recently bought up by Texas Instruments(?). I suggest that you contact TI directly for news on this component. You should also visit http://www.chipdir.com and consider joining the ChipDir-L email list. Part of their objective is help with information and sources of supply for hard to find chips. If you want to really get their attention you should plan on purchasing about US$200.00 worth of parts. It is quite likely that B-B components will be in a state of flux for at least several several months while TI(?) optimizes and integrates the B-B product line into their own. It may not be a bad idea to find a substitute for the 7807. Sixteen bit A/Ds are becomming mainstream today so finding one should not be real hard. I suggest Maxim, Linear Technologies, Analogue Devices and National Semiconductor as starteres. Please email me if I can offer additional information. Sincerely, Bob Smith Larry Cochrane wrote: > > Greetings, > > If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please > let me know. As most of you know I sell an A/D card that a lot of the PSN > stations use to record data. I placed an order for more chips back in > November. I'm now hearing from my distributor that Burr-Brown won't be > shipping more until April or maybe later. When I placed my order the lead > time as this month. Needless to say I'm really upset (there are better word, > but I won't use them) with Burr-Brown. At this point their right up there > on my hate list with PG&E and our politicians who got us in the power > problem... > > As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I > can ship boards with them in it and have the user upgrade later when / if I > get more. Let me know if you can help out. > > Thanks, > > Larry Cochrane > Redwood City, PSN > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- --------- Avoid computer viruses -- Practice safe hex ------------- * * Specializing in small, cost effective embedded control systems * * Robert L. (Bob) Smith Smith Machine Works, Inc. internet bobsmith5@.............. Lumlay Road landline 804/745-1065 Richmond, Virginia 23236+1004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: quake resistant buildings From: sean@........... Date: Sun, 28 Jan 2001 14:43:12 -0600 (CST) Some further considerations about earthquake safe buildings: Naturally if no one is there, a great quake just happens. We had an M8.6 in the Aleutians in May of 86, and it did little damage to the militarily-constructed Navy base. We were lucky that our observer was home at the time, since he was kept busy for several minutes pushing the slide-mounted electronics units back into the equipment racks in the observatory room (I had gotten negligent about locking them). Of course, the safest plan is not to build on or near (20km) of a known fault. This presumes that the geologists know where any potentially active fault may lie (unlike the Northridge event). It also presumes that the realtors don't control the zoning boards, a-la most of California. It also presumes that there is enough space in a very populous country to build away from active zones. And then there are the best laid plans of mice and men. At the time of the last Mexico city disaster, strong building codes were in place, but the newer the building was, the more it fell down. It turns out that bribery let the rebar count be less and the cement weaker. And in real poor countries, they would if they could, but they unfortunately need the housing and can't afford cement, so they just build with less, like a 2-sack mortar mix (2 sacks of portland cement per cubic yard; a 5-sack mix is the minimum); this is just enough to keep the rain from washing the sand and gravel away. And as you see in the pictures of the present India disaster, there is not a lot of rebar in the rubble. And the newer techniques seen in California (eg base isolation) are very expensive, and even the survivable-failure designs (the building doesn't collapse but is an economic loss) are expensive (lots of steel, as is seen exposed in the retro-reinforced buildings in San Francisco), and are untested in most of the world. So there is lots of agreement about what can be done, but no one wants to put their money where their mouth is and possibly prevent these horrible casualties. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: quake resistant buildings From: barry lotz gbl@....... Date: Sun, 28 Jan 2001 02:28:16 -0800 Sean Thomas et al Amen! I've been inspecting building construction for the last 35 years. It seems like the building depts in California are finally coming around to more completely enforcing the code regulations wrt inspection (they can't do it all themselves. In general the code requires the owner to retain a special inspector for certain catagories of work: reinforced concrete, structural masonry, structural steel and welding, etc. I have been saying to all our clients that it is cheap insurance. Regards Barry snip-- > So there is lots of agreement about what can be done, but no one wants > to put their money where their mouth is and possibly prevent these > horrible casualties. > > Regards, > Sean-Thomas > __________________________________________________________ > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Burr-Brown ADS7807 A/D chips - help! From: Keith Payea kpayea@........... Date: Sun, 28 Jan 2001 15:42:04 -0800 Larry: This may not help you in this case, but I use a site called findchips.com to find alternate distributors. A quick check shows only Digi-key with a listing for the part. Good luck. Keith Payea ----- Original Message ----- From: "Larry Cochrane" To: Sent: Sunday, January 28, 2001 12:15 AM Subject: Burr-Brown ADS7807 A/D chips - help! > Greetings, > > If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please > let me know. As most of you know I sell an A/D card that a lot of the PSN > stations use to record data. I placed an order for more chips back in > November. I'm now hearing from my distributor that Burr-Brown won't be > shipping more until April or maybe later. When I placed my order the lead > time as this month. Needless to say I'm really upset (there are better word, > but I won't use them) with Burr-Brown. At this point their right up there > on my hate list with PG&E and our politicians who got us in the power > problem... > > As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I > can ship boards with them in it and have the user upgrade later when / if I > get more. Let me know if you can help out. > > Thanks, > > Larry Cochrane > Redwood City, PSN > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Burr-Brown ADS7807 A/D chips - help! From: "David Saum" DSaum@............ Date: Mon, 29 Jan 2001 08:51:16 -0500 Here are some chip sources I use: http://www.cmbcomp.com/search.htm http://www.need2buy.com/ http://www.questlink.com/ http://www.findchips.com/ Ciao, Dave __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Digest from 01/27/2001 00:00:28 From: Bill Steele bill@...................... Date: Mon, 29 Jan 2001 10:03:01 -0800 (PST) The publication "Seismo-Watch" has an excellent web site with quite detailed information concerning the Kachchh India earthquake. See: http://www.seismo-watch.com/EQS/AB/2001/010126.001.India.html The home page is: http://www.seismo-watch.com/index.html Bill ******************************************************************** William P. Steele Phone: 206-685-5880 Seismology Lab Coordinator Fax: 206-543-0489 Pacific Northwest Seismograph Network (PNSN) UW Geophysics Program Box 351650 Seattle, WA 98195-1650 http://www.geophys.washington.edu/SEIS/ bill@...................... Info line: 206-543-7010 ******************************************************************** __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Plotting earthquakes From: "D. Hill" n0ssy@......... Date: Wed, 31 Jan 2001 00:36:28 +0000 For Christmas my wife purchased a DeLORME mapping program as gift for me. When I first installed it I did not care for it very much as it does not go down to the level of detail I care for. Then I got the idea of trying it to plot earthquake events. I found it to be a good tool for just that job. The name of the program is "Eartha". This comes in two packages. One with a GPS and one without. With out the GPS I think it cost $30 - 40 depending where you buy it. You can plot by Lat/Lon and place a mark at that point, then change the properties and have a different color marker for different magnitudes, also you can change the tag for the marker. What I do is make all Mag. 4's a blue mark, 5's are green, 6's are yellow and 7+ are red. I tag it with the Mag/date. Happy plotting Dewayne Subject: Re: Plotting earthquakes From: GeE777@....... Date: Thu, 1 Feb 2001 14:22:44 EST I use Microsoft ENCARTA to plot events. It is on a CD-Rom. I have my own hand held GPS system. George Erich Geophysical 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 http://hometown.aol.com/gee777/myhomepage/profile.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Software Update - spectrum option From: Arie Verveer ajbv@............ Date: Fri, 02 Feb 2001 14:16:47 +0800 Hi, Just added a "Spectrum" option to the programs that can be found at: (Click "Download PSN related Software" at the bottom of the page) http://www.iinet.net.au/~ajbv/ It plots a heiloplot of time segments against frequency. It may be useful for some type of instrument checks. An example of this type of output is also found on that web page. Also there is a plot of this type in the (Seismic and Magnetic latest) link. It shows the Pc 1-2 events rather well. The instructions have been updated and a few options added in the "drum" program. Cheers Arie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Software update - Spectrum From: Arie Verveer ajbv@............ Date: Fri, 02 Feb 2001 09:38:13 +0800 Hi, Just added a "Spectrum" option to the programs that can be found at: (Click "Download PSN related Software" at the bottom of the page) http://www.iinet.net.au/~ajbv/ It plots a heiloplot of time segments against frequency. It may be useful for some type of instrument check. An example of this type of output is also found on that web page. Also there is a plot of this type in the (Seismic and Magnetic latest) link. It shows the Pc 1-2 events rather well. The instructions have been updated and a few options added in the "drum" program. Cheers Arie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Burr-Brown ADS7807 A/D chips - help! From: "Jack Sandgathe" jacksand@............... Date: Fri, 2 Feb 2001 21:21:17 -0800 Larry, I have a chip: ADS7807P with the following numbers below: 9320ALA2343 ( I think, they are pretty small) If you need it, I will be glad to send it to you. It is probably 5 years old. I see some suggestions from others about possible sources. Let me know. I have moved from British Columbia, where I had obtained electronics from you for an S.G. system. We have built here in Black Diamond - 45 minutes SW of Calgary, Alberta. This summer I hope to complete my system and 'get with it'. Regards, Jack Sandgathe > > If anyone on this list has any Burr-Brown ADS7807 A/D converter chips please > let me know. As most of you know I sell an A/D card that a lot of the PSN > stations use to record data. I placed an order for more chips back in > November. I'm now hearing from my distributor that Burr-Brown won't be > shipping more until April or maybe later. When I placed my order the lead > time as this month. Needless to say I'm really upset (there are better word, > but I won't use them) with Burr-Brown. At this point their right up there > on my hate list with PG&E and our politicians who got us in the power > problem... > > As of today I'm out of 16-bit chips. I do have 10 12-bit chips in-stock so I > can ship boards with them in it and have the user upgrade later when / if I > get more. Let me know if you can help out. > > Thanks, > > Larry Cochrane > Redwood City, PSN > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New WinQuake and SDR beta releases From: "Larry Cochrane" cochrane@.............. Date: Fri, 2 Feb 2001 22:15:47 -0800 Greetings, I have new beta releases of WinQuake and SDR ready for people too try out. You can download the new release of WinQuake here http://www.seismicnet.com/software.html and SDR here http://www.seismicnet.com/sdrdocs/sdr.htm. The main purpose of these releases is support the new PSN Type 4 format. See http://www.seismicnet.com/psnformat4.html for information on the new format. The zip files have readme.txt files on how to upgrade to the new versions. Please download the current WinQuake file. I just fixed a bug in the beta release available for a few days on my web site. You should run beta release 2 with a release date of 02/02/2001. As far as documentation what follows is all I have at this point, sorry about that.... This is what's new with SDR version 3.0, my data logging software; SDR now outputs event files in the new PSN Type 4 format. Do to limited room to add new code this release only outputs the new format. The channel settings screen has a few new fields that station operator should fill in. Please use the PSN Type 4 format web page as a reference when filling in the new fields. The main new fields that should be filled in, if known, are the sensor elevation, output type (acceleration, velocity or displacement), sensitivity and description. If the sensor output is acceleration then sensitivity is in cm/sec/sec per bit, if the output is velocity them it's cm/sec per bit and if the output is displacement then it's in cm per bit. The description field should be a short string describing the sensor. This should include the make and model # if the unit is made by a company. Also new is the sensor location field is no longer limited to 15 characters. Please keep all text fields as short as possible. Besides the reading and writing of the new PSN format, WinQuake has a few new features. They are: From the DOS command line prompt, or some other process like a batch file WinQuake can generate a GIF image file of an event file and then exit. Here's the format: winqk32 /g input_filename output_filename The output_filename is optional. If it's omitted then the output file will be the input_filename with .gif appended to the name. You can also just supply a directory and the output file will be placed in the specified directory. Each of the main windows now has a floating menu with common used menu items. Use the mouse's right button to bring up the menu. The Event Report process has a new feature. The user can now access a historical database located on a server at binghamton.edu. This database goes back a few years and is the one Alan Jones developed for his SeisVol program. When I get some time I will be creating my own database server that will go back further in time and use the historical data provided by Council of the National Seismic System (CNSS). There is two ways of using the data from historical database server. First go to the Event Report dialog box and then select the Load Network Report button. In the Network Service list select the "data@........................... (Historical Data)" item. If you are viewing an event file and select the Connect button, WQ will use the start time of the event file and download all events near that time. You can also search for an event by selecting the Historical button in the Network Event Report dialog box This will bring up a new dialog box. After entering the start, end and magnitude limit press the Ok button. If the server is up and running you should get back a list of all events within the time and magnitude specified. The binghamton.edu server gets its info from dmc.iris.washington.edu. Here are some new things in the Event Display Window: FFT Windowing. If this option is selected the data will be windowed before the FFT is performed. If you are going to filter the data in the FFT window make sure this option is turned off. This option is turned off and on under the Calculate / FFT / Window FFT menu items. Data can be filter in the time domain using a IIR (Infinite Impulse Response) filter. This removes the need to do an FFT to filter the data set. Use the Calculate / Time Domain Filtering menu items or the "F" tool bar button. The Ml magnitude calculation now uses hypocenter instead of epicenter distance. Operations on the data like integrating and filter the data are now saved as a string in the event file, if the file is saved in the Type 4 format. You can view what the list using the Display/Modify / Data Operations menu items. You can undo filtering and integration operations. Use the View / Undo or Undo Integrate menu items. In the Save File dialog box, and if the Save Format is set to "PSN Type 4", you can have WQ save the data in different formats. The data set can be saved as a 16 bit integer, 32 integer, float (4 bytes) or as a double (8 bytes). If you have the Auto button selected, WQ will choose the best format for you. The PSN Text file format that WQ can save and read has been changed to reflect the new fields in the binary Type 4 format. What's not complete yet is the Y scale display. Even if the sensor output type and sensitivity are known, WQ displays the scale in A/D counts. The mouse location is displayed in the status bar in actual units based on the sensitivity and the Y location of the mouse pointer. Not much has changed in the FFT window except the right button floating menu. Again, remember to turn off the FFT windowing if you are going to data filtering. The Map Window as one new feature. As you move the mouse around on the map, WQ will do a region name lookup based on the latitude and longitude of the mouse pointer. The region name is displayed in the status bar. The region name display can be turned on or off using the Options / Region Display menu items. There is a new file called sensor.dat that comes with the beta release. This file is used to fill in information about a sensor not present in the PSN Type 3 event file. Information that this file supplies includes the elevation, sensitivity, description etc of the sensor. The sensor.dat file as a short description of each field. You can use any text editor to view and modify the file. WQ uses this file when viewing a PSN Type 3 file. If the station ID (the file extension) matches one in the sensor.dat file WQ will read in the additional information. That's it for now. Please report any problems you encounter. My event file archive system should be ready to except the new format so station operations can send in PSN Type 4 event files. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: New WinQuake and SDR beta releases From: BOB BARNS roybar@........ Date: Sat, 03 Feb 2001 10:08:07 -0500 Larry, It's good to hear that your great programs are still getting greater. I have not yet tried either of the beta versions. Some time ago, I suggested that WinQuake have the capability of calculating the RMS value for any selected part of a record. This would be handy for comparing seismic noise levels, etc. You said that this would be easy to implement. I'm wondering if you just forgot about doing it. Bob Barns Larry Cochrane wrote: > > Greetings, > > I have new beta releases of WinQuake and SDR ready for people too try out. .... __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: tiltmeters From: ian ian@........... Date: Sun, 04 Feb 2001 09:26:28 -1000 I'm wondering if I have any chance of detecting tele-seismic events with a tilt meter. I think I can resolve a tilt of 5 micro-radians and I can bandpass the signal through a 20 second to 10 second period filter. TIA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New SDR beta release. From: "Larry Cochrane" cochrane@.............. Date: Sun, 4 Feb 2001 15:58:28 -0800 SDR Users, Karl Cunningham found a few problems with the new SDR beta release (version 3.0b). See note below. A new SDR release is (version 3.1b) has been placed on my system fixing the problems he reported. See http://www.seismicnet.com/sdrdocs/sdr.htm for download links. The WinQuake save Nth bug is actually a problem with SDR. -Larry Cochrane Redwood City, PSN From Karl. >I installed your new SDR and Winquake this morning. >You may know abut it, but I noticed that the new SDR reset the Y scale for >each channel to 1, and also reset the save Nth to 1. >I also played with Winquake a little... found the following: >When doing replay from SDR, the save Nth doesn't seem to work correctly: >Making N more than 1 decreases the length (in time) of the record retrieved >rather than keeping the same record length but decreasing the sample rate. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: lehman From: "JORD" jord@............ Date: Mon, 5 Feb 2001 12:21:41 -0500 Hi this is Randy Debney from Toronto I am looking into buying all that = is needed for a lehman seismometer. Right now I only have the computer.=20 Or buying what is needed too receive signals from a radio scanner. Randy Debney 2841 Dundas St. W. Toronto Ontario M6P-1Y6 jord@............
Hi this is Randy Debney from Toronto I = am looking=20 into buying all that is needed for a lehman seismometer.
Right now I only have the computer. =
Or buying what is needed too = receive signals=20 from a radio scanner.
 
Randy Debney
2841 Dundas St. W.
Toronto Ontario
M6P-1Y6
 
jord@............
Subject: Re: lehman From: "Larry Cochrane" cochrane@.............. Date: Mon, 5 Feb 2001 23:37:46 -0800 Randy, Please review my web site. There you will find information on my = equipment I have available to help you get your system up and running. = All of the prices on my web site are current. I no longer sell the = telemetry (radio scanner) board.=20 Please let me know if you have any question on my equipment. -Larry Cochrane Redwood City, PSN ----- Original Message -----=20 From: JORD=20 To: psn-l@................. Sent: Monday, February 05, 2001 9:21 AM Subject: lehman Hi this is Randy Debney from Toronto I am looking into buying all that = is needed for a lehman seismometer. Right now I only have the computer.=20 Or buying what is needed too receive signals from a radio scanner. Randy Debney 2841 Dundas St. W. Toronto Ontario M6P-1Y6 jord@............
Randy,
 
Please review my web site. = There you will=20 find information on my equipment I have available to help you get your = system up=20 and running. All of the prices on my web site are current. I no longer = sell the=20 telemetry (radio scanner) board.
 
Please let me know if you have = any question=20 on my equipment.
 
-Larry = Cochrane
Redwood = City,
PSN
 
----- Original Message -----=20
From:=20 JORD
Sent: Monday, February 05, 2001 = 9:21=20 AM
Subject: lehman

Hi this is Randy Debney from Toronto = I am looking=20 into buying all that is needed for a lehman seismometer.
Right now I only have the computer. =
Or buying what is needed too = receive signals=20 from a radio scanner.
 
Randy Debney
2841 Dundas St. W.
Toronto Ontario
M6P-1Y6
 
jord@............
Subject: Re: lehman From: "Larry Cochrane" cochrane@.............. Date: Mon, 5 Feb 2001 23:48:35 -0800 All, Sorry, should have sent this directly to Randy.=20 -Larry ----- Original Message -----=20 From: Larry Cochrane=20 To: psn-l@................. Sent: Monday, February 05, 2001 11:37 PM Subject: Re: lehman Randy, Please review my web site. There you will find information on my = equipment I have available to help you get your system up and running. = All of the prices on my web site are current. I no longer sell the = telemetry (radio scanner) board.=20 Please let me know if you have any question on my equipment. -Larry Cochrane Redwood City, PSN ----- Original Message -----=20 From: JORD=20 To: psn-l@................. Sent: Monday, February 05, 2001 9:21 AM Subject: lehman Hi this is Randy Debney from Toronto I am looking into buying all = that is needed for a lehman seismometer. Right now I only have the computer.=20 Or buying what is needed too receive signals from a radio scanner. Randy Debney 2841 Dundas St. W. Toronto Ontario M6P-1Y6 jord@............
All,
 
Sorry, should have sent this = directly to=20 Randy.
 
-Larry
 
----- Original Message -----
From:=20 Larry=20 Cochrane
Sent: Monday, February 05, 2001 = 11:37=20 PM
Subject: Re: lehman

Randy,
 
Please review my web site. = There you will=20 find information on my equipment I have available to help you get your = system=20 up and running. All of the prices on my web site are current. I no = longer sell=20 the telemetry (radio scanner) board.
 
Please let me know if you = have any=20 question on my equipment.
 
-Larry = Cochrane
Redwood = City,
PSN
 
----- Original Message ----- =
From:=20 JORD
Sent: Monday, February 05, = 2001 9:21=20 AM
Subject: lehman

Hi this is Randy Debney from = Toronto I am=20 looking into buying all that is needed for a lehman=20 seismometer.
Right now I only have the computer. =
Or buying what is needed too=20 receive signals from a radio scanner.
 
Randy Debney
2841 Dundas St. W.
Toronto Ontario
M6P-1Y6
 
jord@............
Subject: Re: lehman From: "Kenneth J. De Nault" denault@....... Date: Tue, 06 Feb 2001 09:25:51 -0600 Dear Randy, A student of mine created an instruction manual on a Lehman Sesimometer. I can send you a copy (It is big) or soon you can download it from out department web site. Ken De Nault Subject: Re: lehman From: jmhannon@........ Date: Tue, 6 Feb 2001 10:15:47 -0600 (CST) Here is the link. http://www.earth.uni.edu/seismograph.doc Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N,91,39.26W WB0TXL On Tue, 6 Feb 2001, Kenneth J. De Nault wrote: > Dear Randy, > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > send you a copy (It is big) or soon you can download it from out department web > site. > > Ken De Nault > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: BasicStamp question From: "Steve Hammond" shammon1@............. Date: Tue, 6 Feb 2001 14:43:20 -0800 Has anybody incorporated a BasicStamp micro in the construction of their seismograph, tools, amplifiers, or A/D? Regards, Steve Hammond -- PSN Aptos, California
Has anybody incorporated a BasicStamp = micro in the=20 construction of their seismograph, tools, amplifiers, or=20 A/D? 
Regards, Steve Hammond -- PSN Aptos,=20 California 
Subject: Re: tiltmeters From: "George Harris" gjharris@............. Date: Tue, 6 Feb 2001 15:06:08 -0800 Ian, A couple of years ago, I raised the question concerning tilt. At that time I had a vertical pendulum which had a natural frequency of about 1 second. I was most surpised when one of the earthquakes in the Aleutians showed up very clearly with a 15 second period in California. I believe that it was recording tilt. I would recommend you trying to duplicate. George Harris ----- Original Message ----- From: ian To: Sent: Sunday, February 04, 2001 11:26 AM Subject: tiltmeters > I'm wondering if I have any chance of detecting tele-seismic events with a tilt > meter. I think I can resolve a tilt of 5 micro-radians and I can bandpass the > signal through a 20 second to 10 second period filter. > > TIA > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: tiltmeters From: ian ian@........... Date: Tue, 06 Feb 2001 13:11:54 -1000 Hi, thanks for the reply. I have a filter arriving this weekend, so, all being well, I should be able to start seeing very low level tilts instead of just noise. I was hoping that someone could put a figure on the magnitude of tilt generated by a quake on the other side of the world. Perhaps I will have the answer in a few days from my system! Can you remember roughly when the email discussion took place about tilt meters? I can search the appropriate file of the psn archives. Thanks Ian Smith George Harris wrote: > Ian, > > A couple of years ago, I raised the question concerning tilt. At that time > I had a vertical pendulum which had a natural frequency of about 1 second. > I was most surpised when one of the earthquakes in the Aleutians showed up > very clearly with a 15 second period in California. I > believe that it was recording tilt. I would recommend you trying to > duplicate. > > George Harris > > ----- Original Message ----- > From: ian > To: > Sent: Sunday, February 04, 2001 11:26 AM > Subject: tiltmeters > > > I'm wondering if I have any chance of detecting tele-seismic events with a > tilt > > meter. I think I can resolve a tilt of 5 micro-radians and I can bandpass > the > > signal through a 20 second to 10 second period filter. > > > > TIA > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: tiltmeters From: "George Harris" gjharris@............. Date: Tue, 6 Feb 2001 15:22:13 -0800 Ian, I just realized that it was at least three years ago. There was a large quake near the end of the Aleutian chain at that time. I may be able to find the record, but we have moved since then and a lot of things are still buried. I got a response from Ed in Colorado. He may be able to give you more info. George Harris - gjharris@............. ----- Original Message ----- From: ian To: Sent: Tuesday, February 06, 2001 3:11 PM Subject: Re: tiltmeters > > Hi, > > thanks for the reply. I have a filter arriving this weekend, so, all being > well, I should be able to start seeing very low level tilts instead of just > noise. > > I was hoping that someone could put a figure on the magnitude of tilt generated > by a quake on the other side of the world. Perhaps I will have the answer in a > few days from my system! > > Can you remember roughly when the email discussion took place about tilt > meters? I can search the appropriate file of the psn archives. > > Thanks > > Ian Smith > > George Harris wrote: > > > Ian, > > > > A couple of years ago, I raised the question concerning tilt. At that time > > I had a vertical pendulum which had a natural frequency of about 1 second. > > I was most surpised when one of the earthquakes in the Aleutians showed up > > very clearly with a 15 second period in California. I > > believe that it was recording tilt. I would recommend you trying to > > duplicate. > > > > George Harris > > > > ----- Original Message ----- > > From: ian > > To: > > Sent: Sunday, February 04, 2001 11:26 AM > > Subject: tiltmeters > > > > > I'm wondering if I have any chance of detecting tele-seismic events with a > > tilt > > > meter. I think I can resolve a tilt of 5 micro-radians and I can bandpass > > the > > > signal through a 20 second to 10 second period filter. > > > > > > TIA > > > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: BasicStamp question From: "bobshannon.org" earth@........... Date: Tue, 6 Feb 2001 15:46:58 -0800 I know a Basic Stamp expert...If you look up Basic Stamps you will find = him. He is a genius at this stuff...He is also a highly educated = electronics teacher and researcher for many years.... You can access his = site at: http://www.bobblick.com/bob/index.html At the bottom portion of the page is his work in Basic Stamps... He may = even suggest some ideas for you...Do not use me as a ref or forward = tho.....I would appreciate it... Bob ----- Original Message -----=20 From: Steve Hammond=20 To: psn-l@................. Sent: Tuesday, February 06, 2001 2:43 PM Subject: BasicStamp question Has anybody incorporated a BasicStamp micro in the construction of = their seismograph, tools, amplifiers, or A/D?=20 Regards, Steve Hammond -- PSN Aptos, California=20
I know a Basic Stamp expert...If you look up = Basic Stamps=20 you will find him. He is a genius at this stuff...He is also a highly = educated=20 electronics teacher and researcher for many years.... You can access his = site=20 at:
http://www.bobblick.com/b= ob/index.html
At the bottom portion of the page is his work in = Basic=20 Stamps... He may even suggest some ideas for you...Do not use me as a = ref or=20 forward tho.....I would appreciate it...
Bob
 
----- Original Message -----
From:=20 Steve=20 Hammond
Sent: Tuesday, February 06, = 2001 2:43=20 PM
Subject: BasicStamp = question

Has = anybody incorporated=20 a BasicStamp micro in the construction of their seismograph, = tools,=20 amplifiers, or A/D? 
Regards, Steve = Hammond --=20 PSN Aptos,=20 California 
Subject: Re: BasicStamp question From: Doug Sutherland doug@............. Date: Tue, 6 Feb 2001 15:13:31 -0800 Guys, I have been doing quite a bit of work with microcontrollers. I thought I'd mention that the BasicX BX24s are more capable than basic stamps by almost every measure. They are faster, have more RAM, do multitasking, and have 10-bit ADCs. I have these interfaced to embedded pentiums with some interesting and powerful results, and also have them interfaced to 12-bit ADC chips. I am right now working on interfacing EEG circuitry, which is very similar to seismic signal processing. I am working towards building a very small EEG data acquisition module using AD620 instrumentation amps and OP-90 op amps for low pass filtering. I will be trying two approaches to data massaging, in one scenario the microcontroller will pass the raw EEG data to an embedded pentium for FFT processing for spectral analyis, and if that works I will try doing the same on the microcontroller itself. In the case of EEG data, 8-bit ADCs are sufficient. If I succeed with the EEG project, I may try interfacing a 16-bit ADC and doing some seismic signal processing. Most of the techniques and components are the same for EEG as for seismic data, so I can probably reuse or adapt a lot of the same code. The EEG software challenge goes further because there are many possible protocols for user feedback as it related to neurofeedback training. -- Doug __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Fw: First Reports from India From: "Larry Cochrane" cochrane@.............. Date: Tue, 6 Feb 2001 20:06:03 -0800 From Edward Cranswick.... ----- Original Message ----- From: To: Sent: Tuesday, February 06, 2001 9:22 AM Subject: First Reports from India > Topic: First Reports from India > Author: Buddy Schweig schweig@................ > > About 20 of you have sent me Bill Lettis's first report to Susan > Tubessing of EERI. Bill is co-leader of the EERI team. Here it is: > > Dear Susan > > I must rush. It is impossible to get connections on e-mail, so I have dialed > long distance, and am sending this online. > > We have been here for two full days. A quick update. Please send this > update to the extended e-mail list on my original e-mails (i.e., JP Bardet, > Wesnousky, Rockwell, Bray, etc. just to keep everyone informed. > > In no particular order, just brain dump at 2 AM. > > Everyone is working hard and doing great. We have a good team. > > First Day - hectic coordination. No real access, fuel problem for vehicles > in the field (but not really, so all is okay), etc, etc. I think sometimes > that I am gulliBill. > > No food or water readily available like Turkey or Taiwan. EVERYONE should > bring full supply of dried food, nuts, etc to stay in the field until > conditions improve. Need supply of bottled water everyday - daytime temps in > the 80s, dry. No wind though. Bring tent, sleeping bag, and other camp gear > desired, if you want to spend time in the field. Hotels may be available, we > are checking in Ghandi Dam, but most places are damaged. We will see. > Camping may be available with the United Nations near Bhuj, but not sure. > Indian Military not much help so far. We will know tomorrow if we can stay > at the military base. > > Money - bring cash if you go in the field. Hotels in Ahmedabad take visa. > Flying, cars etc want cash. > > Flying is very expensive. $550/hour for fixed wing and $1000 to 1500 /hour > for helicopter. Need to fly in from Ahmedabad so time is minimum of 6 hou rs > to give two hours of reconn. Flying conditions not good. Flight paths > heavily restricted and elevation mandatory over 3000 feet to avoid helicopter > traffic. In other words - lousy air recon at this time. We NEED to get the > Governement of India to help get permission for better recon- we will work on > this over next few days. A helicopter MAY be available in Bhuj airport, thus > we save 4 hours of ferry time from Ahmedabad. We can probably arrange this, > I spoke to pilot directly. Probably plan to spend 3 to 10 k for flying, if > you want to go. > > Air recon results - Interesting: > > We did not observe ANY evidence of surface fault rupture. Highly unusual > given the size of event and amount of probable slip. We did see about 1/2 km > of surface cracking in epicentral area, but this appears to be related to > liquefaction. We will visit this area in the field. However, due to flying > restrictions, we were not able to recon one of the main candidate faults in > the area. This fault is the eastern continuation of the Allah Bund fault and > is right en echelon to the Allah Bund (called the Island Belt Fault). We > will try to visit this fault in the field. It is close to the Pakistani > border, hence flying restrictions. Rockwell and Wesnousky - if you are > coming mainly to characterize surface fault rupture, you may want to wait. > It is interesting that no one has reported fault rupture, including local > people (valuable source usually), media, government, GSI geologists who have > been looking for one week now, and we did not see any from the air. This > strongly suggests that if any occurred, it is up north away from population > an the eastern exstension of the Allah Bund. We will see. ALSO, does anyone > have any preliminary interferometry data to help identify the deformation > field??? This will be a BIG help in doing future recon. > > Lots of liquefaction. At least 500 km2 north of Bhuj on the Banni plains. > Maybe up to 1000 km2. Mostly sand blows, with lots of water - standing > shallow lakes now in many areas. A few lateral spreads, not many that we saw > from the air. We should definitely try to describe the lateral extent and > magnitude of liquefaction relative to epicenter and strong motion data - > great possible data set. > > Kandla Port - did not look too bad from the air. Road to port definitely > damaged from what appears to be lateral spreads. No significant apparent > damage observed from air. We are visiting port in next two days. > > Stable Continental Shield?? I would say definitely not. This area appears > to be an actively growing fold and thrust belt. Lots of anticlines with > apparent Quaternary activity. Folds are assymmetric, north vergent. A few > possible fault scarps, but most scarps appear to be related to fold limbs. > Definitely active folds, however. Individualo folds are on the order of 50 > km long, in fold trends that are up to 200 km long. Folds are en echelon in > each trend suggesting lateral component. One fold appears to be deforming > the modern mud flats along the coast east of Kandla. Definitely active. > Rate of shortening?? No idea yet. Many rivers and washes draining the folds > have impressive flights of fluvial terraces, suggesting fairly rapid uplift > of folds. Great future Ph.D study - Tectonic Geomorph of the region - > unfortuantely, no air photos are availble to map with. > > Computers/ safety/ etc. Everything is okay. Not really a problem as far as > I can tell, except e-mail connections are a bitch. > > Tapper Dam and Ghangi Dam. These are cities, NOT dams. When someone says > that these are damaged, they mean the cities. (Dam mean town or city in > Hindi). > > Embankment dams. We observed at least four (one large and three small) > embankment dams that experienced toe failures at upstream side., one dam > nearly failed it appears. > > Tank farms near Kandla. Tanks appeared to be okay, No major tank spills, > but someone needs to check more carefully. However, at least two large oil > spills are present, apparently from pipe (?) failures. We are checking this > out. > > Salt ponds. Lots of salt ponds are around, especially east of Bhuj and south > along the coast. The salt ponds east of Bhuj (east of epicenter) experienced > both dike failures and seich failures or breaches. Can this help with > long-period ground motione stimates?? > > Damage. Ahmedabad survived very well, despite the many isolated building > collapses. We have all the buildings identified and they are easily mapped. > We should compare the distribution of buildings damaged to geotechical > conditions to try to see what controls threir failure (probably just some > spotty construction we suspect). No real "pattern" discernible yet (building > type, spatial distribution, geologic condition, etc). > > Damage continued. Bhuj heavily damaged, kind of like Golchuk, but far more > single story houses. Dozens of small communities north and east of Bhuj > (1000 to 5000 people), totally destroyed (80 to 100!!%) building collapse of > all types. This is an interesting story in of itself, and not getting much > attention. LOTS of local people lost in the relief effort because towns are > too small to get attention. I don't know, but this might be an issue worth > discussing (Krishna will look into this). > > Ancient wall of Bhuj (about 400 yrs??) heavily damaged. > > Ancient cities. This area appears to have been widely settled BC sometime, > but abandoned at some point. This could be a great story if someone looks > into it. Lots of possible reasons for abandonment, but obvious one is > earthquake. > > Ancient Rivers. For some reason, several major tributaries to the Indus > River have vanished or shifted course. This apparently is because of uplift > and active growth of the fold and thrust belt. It also helps to explain why > early people abandoned the area. I do not think that climatic change caused > the change in river course or disappearance of these rivers that are > described in early history documents. > > Liquefaction along coast. Some of the best offshore liquefaction that I have > ever seen. Widespread offshore liquefaction was visible from the air south > east of Kandla Port. Very interesting. I don't know scientific value if any. > > Team Assignments. Two teams of four have gone to field today, and will stay > wherever they find shelter for the next two to three days. (Geotech team > with Sudhir Jain and Umesh Dayal, and Industrial facilities and Lifelines > team with Gupta and Don B.) Structures team - Rakesh Goel, Murty, etc are > working for next day or so on building damage in Ahmedabad. Geology team > (lettis, hengesh, narula, chaubey) will go to field for next two to three > days. > > Things are beginning to smooth out and logistics are improving. This is > really a great earthquake with lots of things to document. > > Sorry for the quick note, but I have been on line to US for over one hour and > need to get off. I will try again in two days. > > Bill > -- > ------------------------------------------------------------------------- > Eugene Schweig > Central U.S. Coordinator > Earthquake Hazards Program Office > U.S. Geological Survey > > address: (901) 678-4974 > U.S. Geological Survey Fax: (901) 678-4897 > 3876 Central Ave., Ste. 2 > MEMPHIS, TN 38152-3050 > > ------------------------------------------------------------------------- > > This email is generated by Central U.S. Earthquake Hazard MailList. > Archives of postings are available at http://clifty.com/hazard/archives.html > If you did not subscribe to this mailing list, please send email > with the subject "Unsubscribe" to: > eq-haz-central@.......... > or remove yourself directly using the form at: > http://clifty.com/hazard/ > If you experience problems, contact the moderator at: > eq-haz-owner@.......... > > > Version 1.23 copyright Clifty WebWorks 1999 > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Winquake From: "I.ES.N." info@........ Date: Wed, 7 Feb 2001 08:53:01 +0100 Hi Larry I noted in new version that the header of event information it doesn't appended on object field of "send e-mail message" option. It's normal? With this version is it absolutely impossible to read the files in old format? Now I'm running in my pc two different versions in two different directories. Cheer Francesco - Italy __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Winquake From: "Larry Cochrane" cochrane@.............. Date: Wed, 7 Feb 2001 02:02:36 -0800 Francesco, ----- Original Message ----- From: "I.ES.N." To: "PSN" Sent: Tuesday, February 06, 2001 11:53 PM Subject: Winquake > Hi Larry > > I noted in new version that the header of event information it doesn't > appended on object field of "send e-mail message" option. It's normal? If you select a PSN Type 4 event file in the Open File dialog box the "Send Email Message" button should be enabled. I just sent you a PSN Type 4 test file using this feature. > > With this version is it absolutely impossible to read the files in old > format? Now I'm running in my pc two different versions in two different > directories. The new version of WinQuake should read the old format. Please send me an event file, in a private message, that can not be read by the new version. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: BasicStamp question From: Angel Rodriguez angel@............ Date: Wed, 7 Feb 2001 07:02:37 -0500 Hello Steve, Tuesday, February 06, 2001, 5:43:20 PM, you wrote: SH> Has anybody incorporated a BasicStamp micro in the construction of their SH> seismograph, tools, amplifiers, or A/D? SH> Regards, Steve Hammond -- PSN Aptos, California The AS1 is based on a BS1, and a 12 bit AtoD and an OP27 -- Best regards, Angel mailto:angel@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: BasicStamp question From: "David Saum" DSaum@............ Date: Wed, 7 Feb 2001 08:29:08 -0500 > From: "Steve Hammond" > > Has anybody incorporated a BasicStamp micro in the construction of their > seismograph, tools, amplifiers, or A/D? > Regards, Steve Hammond -- PSN Aptos, California I have done a lot of work with the BasicStamp and PIC microprocessors and I am currently finishing up a PIC based design: You can use the Stamp/PIC pseudo RS-232 output at 9600bps 8N0 to record data with the Win freeware "Amaseis" program by Alan Jones.. http://www.geol.binghamton.edu/faculty/jones/as1.html Alan has been very helpful in tweaking Amaseis to work with devices like Stamps, PICs and DataQ units from RS. Your output ASCII data records can be + or - numbers with magnitudes up to 32767 (perhaps greater) and each record is terminated with LF and CR characters. Amaseis can create data records that can be read by WinQuake. Let me know if you need any more information. Records look like +33LFCR -10LFCR .... My single board system (amp/filter/adc/serial) draws its power from the serial port, so its starts working as soon as you plug it in. I am using a single low noise opamp (LT1677), an 8 pole bessel filter chip (MAX7401) and a PIC14000 with onboard 16 bit a/d. I use free/shareware to set my PC clock to accurate time and to maintain the time base within a fraction of a second/week. I just sent a beta version to Angel Rodriguez in Panama for use with 4.5 Hz geophones. I am looking for more beta testers. My goal is make it simple to construct a high quality Lehman or geophone system for less then $200. Ciao, Dave __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: From: "Bryan Goss" bgoss@....................... Date: Wed, 7 Feb 2001 08:46:10 -0600 I have not figured out why this is not in the near real time quake list, I = looked at Memphis, Little Rock, and my Lehman. The Memphis Recent New Madri= d Helicorder Displays Show what looks like a quake at 10:28 UTC But I can=92t find any info on this? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: "Raul J. Alvarez" ralvarez@........ Date: Wed, 07 Feb 2001 08:12:27 -0700 Hello Kenneth, I downloaded the file but am unable to open it successfully in MS Word, Wordperfect and others. Do you know what format he used to create the document? Thanks, Raul Alvarez "Kenneth J. De Nault" wrote: > Dear Randy, > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > send you a copy (It is big) or soon you can download it from out department web > site. > > Ken De Nault __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: ian ian@........... Date: Wed, 07 Feb 2001 05:13:26 -1000 I downloaded it yesterday and it opens in MS Word with no problems... "Raul J. Alvarez" wrote: > Hello Kenneth, > > I downloaded the file but am unable to open it successfully in MS Word, Wordperfect > and others. Do you know what format he used to create the document? > > Thanks, > > Raul Alvarez > > "Kenneth J. De Nault" wrote: > > > Dear Randy, > > > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > > send you a copy (It is big) or soon you can download it from out department web > > site. > > > > Ken De Nault > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: Bob Smith bobsmith5@........ Date: Wed, 07 Feb 2001 10:41:31 -0500 I also could not open it directly with MS Word (a fairly common problem here which I suspect has something to do with Navigator getting in the way??), but I could view it an print it with the free Microsoft Word Viewer program available from http://www.microsoft.com Anybody want to volunteer to put this thing in .pdf format?? Bob Smith ian wrote: > > I downloaded it yesterday and it opens in MS Word with no problems... > > "Raul J. Alvarez" wrote: > > > Hello Kenneth, > > > > I downloaded the file but am unable to open it successfully in MS Word, Wordperfect > > and others. Do you know what format he used to create the document? > > > > Thanks, > > > > Raul Alvarez > > > > "Kenneth J. De Nault" wrote: > > > > > Dear Randy, > > > > > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > > > send you a copy (It is big) or soon you can download it from out department web > > > site. > > > > > > Ken De Nault > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- --------- Avoid computer viruses -- Practice safe hex ------------- * * Specializing in small, cost effective embedded control systems * * Robert L. (Bob) Smith Smith Machine Works, Inc. internet bobsmith5@.............. Lumlay Road landline 804/745-1065 Richmond, Virginia 23236+1004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: From: Stephen & Kathy mortskm@....... Date: Wed, 07 Feb 2001 07:54:29 -0800 Mornin,, actually it is on almost all the helicorders around the world,,= check out; http://aslwww.cr.usgs.gov/Seismic_Data/heli2.htm A very rough guess, based on the time of what I think are the surface wav= es in the little rock trace, the event is around 1,500 +/- a couple hundr= ed miles from Mimphis. The IU/PAYG Puerto Ayora, Galapagos Islands trace on the world helicorder site looks to have the earliest and highest= trace. Stephen PSN Station #55 near Pilot Hill Ca 38.828N 120.979W Bryan Goss wrote: > I have not figured out why this is not in the near real time quake list= , I looked at Memphis, Little Rock, and my Lehman. The Memphis Recent New= Madrid Helicorder Displays Show what looks like a quake at 10:28 UTC > But I can=92t find any info on this? > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: From: "bobshannon.org" earth@........... Date: Wed, 7 Feb 2001 08:01:07 -0800 There has been a lot of talk lately as concerns the SE US.... I am now just starting to pay attention although I knew the Madrid was a big deal I didn't figure it into my scheme. Ray Cole who lived on the Madrid, told me many stories that were passed on orally to him....Ray died in his mid-80's a few years ago...I wish I had more time to speak with him. Meanwhile ELFRAD has been posting some messages about this area...no warnings or such as this is not what they do...however..if activity continues to build in this area, I may add a few easy to use clickables to the alert site. We have many readers who live back east and this has been a major concern to them...I appreciate any and all input I can get on the Madrid System... Bob cc: Pinpoint ----- Original Message ----- Mornin,, actually it is on almost all the helicorders around the world,, check out; http://aslwww.cr.usgs.gov/Seismic_Data/heli2.htm A very rough guess, based on the time of what I think are the surface waves in the little rock trace, the event is around 1,500 +/- a couple hundred miles from Mimphis. The IU/PAYG Puerto Ayora, Galapagos Islands trace on the world helicorder site looks to have the earliest and highest trace. Stephen PSN Station #55 near Pilot Hill Ca 38.828N 120.979W Bryan Goss wrote: > I have not figured out why this is not in the near real time quake list, I looked at Memphis, Little Rock, and my Lehman. The Memphis Recent New Madrid Helicorder Displays Show what looks like a quake at 10:28 UTC > But I can't find any info on this? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: quakes not reported From: sean@........... Date: Wed, 7 Feb 2001 11:01:01 -0600 (CST) ASL is having communication problems: (I have omitted all the routing info here) Sean-Thomas Date: Tue, 06 Feb 2001 12:24:18 -0700 Attention all station operators, We have been experience some transient problems with our Internet connection which may be causing a few email kick backs from some of you. The problem appears to come and go, so you may be invisible to most of you. Please, if you do experience a message return, try again. We hope to have this problem solved very soon. Thank you Kent > >We have been experiencing a problem getting data in and out of the DOI Net >(Department of the Interior Network). This only affects some places some of >the time. The problem is that NASA is not advertising all the routes for >customers on the DOI Net. We have noticed that (here at ASL) that some email >from addresses in the East and overseas have not been arriving. > >This problem started about 6 days ago. The folks that maintain the DOI Net >have told me that they are working feverishly with NASA to fix these >problems. Attached below is the original message: > >Last night I determined that NASA was not advertising doi.net routes at >MAE East. Since we depend on NASA's advertisements to pull a sizeable >chunk of our traffic from the Internet into MAE East, about 1/2 of the >traffic which use to enter MAE East is now going through MAE West. I >contacted the NASA Network Team and they confirmed my suspicions. I had >hoped they would have it resolved by this morning but it isn't. I will >advise as soon as I have some word as to when this will be corrected. > >We are actively working on generating more direct peering relationships >with the ISPs at both MAEs. We also have a tentative arrangement with >DoD's DREN to proxy peer for us as well. When these measures are in >place, you won't see this kind of slow down again. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New Madrid Fault zone From: sean@........... Date: Wed, 7 Feb 2001 11:20:18 -0600 (CST) Bob, It is called the New Madrid Fault zone, and generally encompasses the upper Mississippi embayment, and not the entire SE of the USA. Check some current (< 20yrs) maps and literature. I have operated as many as 56 telemetry stations thruout the area since 1974, most of which are now covered by the CERI (Memphis) network. Sean-Thomas Morrissey St. Louis University __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: From: Stephen & Kathy mortskm@....... Date: Wed, 07 Feb 2001 10:35:00 -0800 Mornin again,, this looks to be the quake you are looking for and is 1,5= 00 miles from Little Rock!! Distance between 34:44:46N 92:17:20W and 13:09:36N 89:01:48W, as the crow= flies: 1500 miles (2413 km) (1303 nautical miles) 01/02/07 10:23:09 13.16N 89.03W 64.0 5.4M A EL SALVADOR retrieved from: http://quake.wr.usgs.gov/cgi-bin/quake/gldfs.cr.usgs.gov I used the distance calculator found at: http://www.indo.com/cgi-bin/dist I used Topozone to get the coordinates for Little Rock at: http://www.topozone.com/ It was about 1,515 miles from Memphis. Stephen 38.828N 120.979W Stephen & Kathy wrote: > Mornin,, actually it is on almost all the helicorders around the world= ,, check out; > http://aslwww.cr.usgs.gov/Seismic_Data/heli2.htm > A very rough guess, based on the time of what I think are the surface w= aves in the little rock trace, the event is around 1,500 +/- a couple hun= dred miles from Mimphis. The IU/PAYG Puerto Ayora, Galapagos Islands > trace on the world helicorder site looks to have the earliest and highe= st trace. > Stephen > PSN Station #55 > near Pilot Hill Ca > 38.828N 120.979W > > Bryan Goss wrote: > > > I have not figured out why this is not in the near real time quake li= st, I looked at Memphis, Little Rock, and my Lehman. The Memphis Recent N= ew Madrid Helicorder Displays Show what looks like a quake at 10:28 UTC > > But I can=92t find any info on this? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: DataQ A/D From: Karl Cunningham karlc@.......... Date: Wed, 07 Feb 2001 11:04:46 -0800 Hi all -- This may be old news, but DataQ is selling their 4-channel 8-bit A/D converter (connects to PC via serial port) for $15 each. See: http://www.dataq.com/cgi-local/SoftCart.exe/products/startkit/di194.htm?E+sc store This could be part of a portable system with a laptop and a portable seismometer (geophone?). Use two or three amplifiers at different gains to feed different channels of the A/D to help with the limitation of only 8 bits. Might be fun to use while camping, on vacation, etc. Karl __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: Doug Crice dcrice@............ Date: Wed, 07 Feb 2001 11:02:53 -0800 I have a PDF version of the student's report on the Lehman manual. Probably it should be parked on the PSN website for archival pruposes if Larry wants to allocate space (1.4 MB). It is tempting to edit it however, to tweak the fonts and use columns for readability. The Word version is 7.4 MB. Bob Smith wrote: > > I also could not open it directly with MS Word (a fairly > common problem here which I suspect has something to do with > Navigator getting in the way??), but I could view it an > print it with the free Microsoft Word Viewer program > available from > > http://www.microsoft.com > > Anybody want to volunteer to put this thing in .pdf format?? > > Bob Smith > > ian wrote: > > > > I downloaded it yesterday and it opens in MS Word with no problems... > > > > "Raul J. Alvarez" wrote: > > > > > Hello Kenneth, > > > > > > I downloaded the file but am unable to open it successfully in MS Word, Wordperfect > > > and others. Do you know what format he used to create the document? > > > > > > Thanks, > > > > > > Raul Alvarez > > > > > > "Kenneth J. De Nault" wrote: > > > > > > > Dear Randy, > > > > > > > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > > > > send you a copy (It is big) or soon you can download it from out department web > > > > site. > > > > > > > > Ken De Nault > > > > > > __________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email PSN-L-REQUEST@.............. with > > > the body of the message (first line only): unsubscribe > > > See http://www.seismicnet.com/maillist.html for more information. > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > -- > > --------- Avoid computer viruses -- Practice safe hex > ------------- > * * Specializing in small, cost effective embedded control > systems * * > Robert L. (Bob) Smith Smith Machine Works, Inc. > internet bobsmith5@........ 9900 Lumlay Road > landline 804/745-1065 Richmond, Virginia > 23236+1004 > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: Doug Crice dcrice@............ Date: Wed, 07 Feb 2001 11:17:28 -0800 OK, I stuck the Lehman manual on my web page in pdf format. http://www.georadar.com/Lehman_manual.PDF (case sensitive) I would invite Larry to give it a permanent home on the PSN site. Doug Crice Bob Smith wrote: > > I also could not open it directly with MS Word (a fairly > common problem here which I suspect has something to do with > Navigator getting in the way??), but I could view it an > print it with the free Microsoft Word Viewer program > available from > > http://www.microsoft.com > > Anybody want to volunteer to put this thing in .pdf format?? > > Bob Smith > > ian wrote: > > > > I downloaded it yesterday and it opens in MS Word with no problems... > > > > "Raul J. Alvarez" wrote: > > > > > Hello Kenneth, > > > > > > I downloaded the file but am unable to open it successfully in MS Word, Wordperfect > > > and others. Do you know what format he used to create the document? > > > > > > Thanks, > > > > > > Raul Alvarez > > > > > > "Kenneth J. De Nault" wrote: > > > > > > > Dear Randy, > > > > > > > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > > > > send you a copy (It is big) or soon you can download it from out department web > > > > site. > > > > > > > > Ken De Nault > > > > > > __________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email PSN-L-REQUEST@.............. with > > > the body of the message (first line only): unsubscribe > > > See http://www.seismicnet.com/maillist.html for more information. > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > -- > > --------- Avoid computer viruses -- Practice safe hex > ------------- > * * Specializing in small, cost effective embedded control > systems * * > Robert L. (Bob) Smith Smith Machine Works, Inc. > internet bobsmith5@........ 9900 Lumlay Road > landline 804/745-1065 Richmond, Virginia > 23236+1004 > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: Bob Smith bobsmith5@........ Date: Wed, 07 Feb 2001 16:00:12 -0500 Thanks Doug!!! I displayed here very nicely with Adobe Reader 4.0 so I can also print it. Well done, Bob Smith Doug Crice wrote: > > OK, I stuck the Lehman manual on my web page in pdf format. > > http://www.georadar.com/Lehman_manual.PDF (case sensitive) > > I would invite Larry to give it a permanent home on the PSN site. > > Doug Crice > > Bob Smith wrote: > > > > I also could not open it directly with MS Word (a fairly > > common problem here which I suspect has something to do with > > Navigator getting in the way??), but I could view it an > > print it with the free Microsoft Word Viewer program > > available from > > > > http://www.microsoft.com > > > > Anybody want to volunteer to put this thing in .pdf format?? > > > > Bob Smith > > > > ian wrote: > > > > > > I downloaded it yesterday and it opens in MS Word with no problems... > > > > > > "Raul J. Alvarez" wrote: > > > > > > > Hello Kenneth, > > > > > > > > I downloaded the file but am unable to open it successfully in MS Word, Wordperfect > > > > and others. Do you know what format he used to create the document? > > > > > > > > Thanks, > > > > > > > > Raul Alvarez > > > > > > > > "Kenneth J. De Nault" wrote: > > > > > > > > > Dear Randy, > > > > > > > > > > A student of mine created an instruction manual on a Lehman Sesimometer. I can > > > > > send you a copy (It is big) or soon you can download it from out department web > > > > > site. > > > > > > > > > > Ken De Nault > > > > > > > > __________________________________________________________ > > > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > > > To leave this list email PSN-L-REQUEST@.............. with > > > > the body of the message (first line only): unsubscribe > > > > See http://www.seismicnet.com/maillist.html for more information. > > > > > > __________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email PSN-L-REQUEST@.............. with > > > the body of the message (first line only): unsubscribe > > > See http://www.seismicnet.com/maillist.html for more information. > > > > -- > > > > --------- Avoid computer viruses -- Practice safe hex > > ------------- > > * * Specializing in small, cost effective embedded control > > systems * * > > Robert L. (Bob) Smith Smith Machine Works, Inc. > > internet bobsmith5@........ 9900 Lumlay Road > > landline 804/745-1065 Richmond, Virginia > > 23236+1004 > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > -- > Doug Crice http://www.georadar.com > 19623 Via Escuela Drive phone 408-867-3792 > Saratoga, California 95070 USA fax 408-867-4900 > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- --------- Avoid computer viruses -- Practice safe hex ------------- * * Specializing in small, cost effective embedded control systems * * Robert L. (Bob) Smith Smith Machine Works, Inc. internet bobsmith5@.............. Lumlay Road landline 804/745-1065 Richmond, Virginia 23236+1004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: DataQ A/D From: wizard@......... (Michael Duck) Date: Wed, 7 Feb 2001 14:36:35 -0800 I just bought two of them. They come with the key to enable all four channels. Limited sampling rate. Good deal. A great toy for experimenters. Try connecting to a geophone. Michael Duck > This may be old news, but DataQ is selling their 4-channel 8-bit A/D > converter (connects to PC via serial port) for $15 each. > > http://www.dataq.com/cgi-local/SoftCart.exe/products/startkit/di194.htm?E+sc __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: DataQ A/D From: Mike Lozano mikel@............... Date: Wed, 07 Feb 2001 16:52:42 -0600 Hi everyone! I just checked the DATAQ site - sounds like a great deal. One question, however! Several years ago, I purchased a DATAQ A/D converter for Windows 3.1 It functioned quite well, but its software only allowed one to capture a very limited amount of data .... 550 KB, I think. Does anyone know if this offering is any different from the standpoint of recorded file size? Thanks, Mike Lozano, K5RLY http://www.sciencearea.com -0- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: re:file From: "JORD" jord@............ Date: Wed, 7 Feb 2001 17:57:45 -0500 Thank You all for the leman manual this will help with part 1. Randy
Thank You all for the leman manual this = will help=20 with part 1.
Randy
Subject: Re: lehman From: KTextinction65Ma@....... Date: Wed, 7 Feb 2001 18:39:48 EST Doesn't work on this PC or ISP. Is there something I should know? Ian Extinction is the last step! __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: Doug Crice dcrice@............ Date: Wed, 07 Feb 2001 15:58:17 -0800 I'm not sure what doesn't work for Ian, but if he means the Lehman manual, I was negligent in not including instructions. Let's try again. A student at the University of Northern Iowa, Kelly Knight, built a Lehman Seismograph. The student wrote a manual to document the process, including several photographs. The manual is available for download on the UNI web site in Microsoft Word (7.5 MBytes) at http://www.earth.uni.edu/seismograph.doc. I printed out a copy in Adobe Acrobat format, commonly known as .pdf, and put a copy on my website at http://www.georadar.com/Lehman_manual.PDF This second version is 1.4 Mbytes and can be downloaded much quicker. To read this file, you need a copy of Adobe Acrobat Reader, a free program available from Adobe at http://www.adobe.com/products/acrobat/readstep.html The .pdf Adobe Format is becoming ubiquitous on the web as a means of transmitting documents, so you should get a copy of you don't have one. To get the .pdf version of the Lehman manual, click on the above link and your browser should allow you to save the file. Then, go to Acrobat reader and open the file as you would with any program. Sometimes this process happens automatically, but probably not in this case. Doug KTextinction65Ma@....... wrote: > > Doesn't work on this PC or ISP. > Is there something I should know? > > Ian > Extinction is the last step! > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: tiltmeter sensitivity From: sean@........... Date: Wed, 7 Feb 2001 20:10:01 -0600 (CST) Ian, We can attempt to calculate the seismic displacement sensitivity of your 5 microradian (urad) resolution tiltmeter. But first we will make some assumptions. We will assume that it is 5 urad p-p. And if this is the threshold of resolution, we will need to assume a minimum signal-to-noise (S/N) ratio of from 20 to 100, requiring data of 100 urad p-p minimum. But note that consistent data requires an S/N of at least 100. Also, the displacement sensitivity of pendulum tiltmeters is inversely proportional to the square of the natural period. We will assume that the sensor is critically damped somehow. Since you don't indicate a large instrument, I will assume that you have something based on or similar to the Fredericks electrolytic bubble, which is viscously damped at one second period. (If you have the Rockwell/Kinemetrics sensor, you would mention two axes with 100x the resolution). Geomechanics uses the Frederics bubbles in their sensors, the best of which they claim to have 0.1 urad resolution. Or you may have a hinged pendulum, ranging from a simple vertical pendulum like the SG design, to a compact garden gate with a displacement detector. In either case, I would expect much greater resolution. A 24.8 cm, 1 second clock pendulum with a 1 nanometer resolution displacement detector (VRDT, etc) has a resolution of 0.004 microradians (neglecting the suspension). For a horizontal tiltmeter: (where z is the displacement in meters, and phi is the tilt) z = (g * Tn^2 / 4 * pi^2) * phi letting Tn = 1 second, and phi = 100 x 10^-6 radians, (g = 9.8) z = 24.8 microns for a 100 urad p-p tilt. So what size quake will cause this: using the standard magnitude formula: Ms = log(A/P) + 1.66*log(distance) - 0.18. , where A is the p-p ground motion in nanometers (10^-9meter), P is the period in seconds, and the distance is in degrees. The value of the corrector term (-0.18) is subject to much debate, and has large regional variations, depending on how urgently one needs funding vs the complaints of the tourism board. For a standard teleseismic surface wave we can assume that P = 20 seconds and that your distance = 90 degrees (~ USA to ~ South Pacific), so Ms = log(24800/20) + 1.66*log(90) -0.18 Ms = 3.09 + 3.24 - 0.18 Ms = 6.16 This is a rather large figure, but is supported by experience. When I operated an array of 10 bi-axial tiltmeters in the Aleutians, we had on-site battery operated strip chart monitors as backup to the digital telemetry systems. The Rustrak charts operated at 1/16" per hour (to get 1 year on a 50 ft roll) at a scale of +,- 2 urads (to accommodate seasonal drift and crustal deformation, which nonetheless required an autonomous digitally controlled auto-zeroing system ). The earth tides are easily evident at 0.1 - 0.2 urad, since I improved the S/N with a 20 second low pass filter to remove the 3 - 6 second microseisms and to reduce storm noise (the Aleutians DO have storms!). The South Pacific teleseisms would show up about monthly (about every 3 - 4 feet of the chart), but they would have to be a M 6+ or greater to show up even at the 0.5 - 1 urad level; we then looked them up in PDE to check for the timing corrections (over a year) of the strip charts for comparisons of the co-sited data. So I would not consider a 5 urad resolution tiltmeter a very interesting instrument if it detects only a few teleseisms per year. __________________________________________________________ Here is a repeat of the calculation of the numbers one can expect for a mechanical pendulum: SO ... Lets consider some formulae of interest for the horizontal pendulum: (assuming that the restoring force by the hinges and/or pivot are minimal): The natural mechanical period: Tn = 2*pi*sqrt(L/(g*sine i)) where L is the boom length in cm, g=980cm/sec^2, i is the angle that the boom makes wrt the horizontal, (if i is measured in radians, (360 degrees = 2*pi radian, or 1 radian = 57.3 degrees), and i is small, sine i = i). For example, a 40 cm boom hanging vertically (mass at the bottom) as a simple tick-tock pendulum ( an SG design at an angle of 90 degrees) has a period of 1.3 seconds. (a one second clock pendulum is 24.8 cm). But the pendulum supports or hinges can be arranged in a "garden gate" configuration as is the Lehman and most long-period horizontals. When tilted horizontally to about 4 degrees, the period is 5 seconds. At about a 1 degree ((2*pi/360) radian) angle, it is 10 seconds, and at about 0.23 deg. it is 20 seconds. However, if we increase the boom length by times 4 to 160cm, (an impractical 60 inches), we also get a period of 20 seconds. So the period is changing with the square root of the boom length as well as the inverse of the square root of the angle the boom makes with the horizontal. In general, a practical boom length is 10" to 15", with a baseplate of 15" to 24" long and about half as wide at the leveling end (for a horizontal; leveling for a vertical, as shown above, is nowhere as critical, and 4" to 8" widths are workable). It is important to note that the size of the mass determines nothing of the period or sensitivity to tilting. Any reasonable size will work; larger is better for overcoming any torque of the hinges or flexures, to the point where the mass/boom structure begins to distort any part of the suspension. (THe size of the mass IS a factor in a VBB fedback system). The total mass of the boom should be less than 10% of the main mass, which includes the sensor coils. The tilt sensitivity of a seismometer is therefore a function of the square of the operating period Tn. For a HORIZONTAL: (where z is the displacement, and phi is the tilt) z = (g * Tn^2 / 4 * pi^2) * phi For a VERTICAL: z = (g * Tn^2 / 8 * pi^2) * phi^2) (vertical) Note the vertical sensor responds to the SQUARE of the tilt. BUT .. Since the angle is always small and less than 1, the square of a small angle (measured in radians) is smaller than the original number. So conversely the horizontal is MORE sensitive to tilt of the base (at a right angle to the boom) by the square of the tilt angle. SO what does this mean in comparing the tilt noise of a vertical compared with a horizontal of the same period. Suppose the seis is in a corner of the garage or basement. Then suppose that when you walk up to the site you deflect the floor by 1 micron (10^-6 meter) when you are 1 meter away (Or your neighbor parks his Humvee 100 meters away and deflects the neighborhood by 0.1 millimeter.) In both cases the tilt is delta(L)/L or 10^-6 radian. So if your horizontal seis has a period of 10 seconds, the mass will offset 24.8 microns. This is a large number; the 6-second microseisms run about 2 to 4 microns. HOWever: if you have a vertical seis, the displacement from a 10^-6 tilt is 10^-6th of the horizontal. Conversely, it takes a floor deflection if 1mm at 1 meter distance to get the same 24.8 microns movement on a vertical. So when you push the operating period from 10 to 20 seconds, the tilt sensitivity increases by 4. Even a modest period increase demands a good site for the instrument. The WWNSS (worldwide network of standard seismographs) originally tried to operate the long period sensors at 30 seconds, but so many were always at the stops that they backed off to 15 seconds as the standard. You can test the tilt sensitivity using your leveling screw, which I guess is something like 40 threads/inch. In the above formula, "phi" is the angle in radians, so if you turn the screw one turn and if the base support width is 10 inches, the tilt is 1/40" divided by 10", or 0.0025 radians. Using the formula above for a horizontal sensor: The displacement then is 0.062cm times the square of the period. If Tn is 10 seconds, it is 6.2cm; if Tn is 100 seconds, one turn of th 40 tpi screw will try to move the boom 620 cm. Even if 1/100 turn can be used, the displacement is still quite large. THis is why VBB instruments have a feature that allows a shorter period to be switched in for setup at installation, and a motor-driven lever of 100:1 to level the sensor in operation. A typical tilt noise level for the 360-second STS-1 is equivalent to about 6 nanoradians. For practical operation of a home-made VBB, an operating period of 20 to 40 seconds would be preferred. Regards, Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: tiltmeter sensitivity From: ian ian@........... Date: Wed, 07 Feb 2001 16:50:03 -1000 Hi, thanks for that exhaustive analyses, I appreciate your efforts. The tilt meter is called an Electrolevel and is a "..closed tube containing a bubble of gas, an electrically conducting liquid and electrodes...". It is a metal cylinder about 3 inches long and 3/4 of an inch in diameter. It's made in the UK, vintage 1990, and has a range of +/- 0.5 degrees. The box that drives it produces a voltage of about 0.5 mV per arc second. I'll be connecting this signal to a Krohn-Hite 3322 filter and setting the band pass to 20 seconds to 10 seconds (arbitrary choice). I can switch in a gain of 1, 100 or 10000 to this, though it will depend on how much noise is produced by the drive box. My A/D is 12 bits and is set to +/- 20 mV. So my estimate of 5 urad is a bit of a guess. I'll know better when I get the filter (hopefully this weekend). I wouldn't be surprised if a lot of teleseismic events pass me by un-noticed as your analyses suggests. I think it may well depend on the integrety of the signal produced by the drive box. Thanks Ian Smith __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: BasicStamp question From: "jimesler" jimesler@.......... Date: Wed, 7 Feb 2001 20:58:52 -0600 Steve,=20 I've got a prototype of a stamp seisograph designed. I'm using a 24 = ADC, a programmable gain amp and the stamp to send rs-232 data to my PC. = The coil is a 30,000 turn 42 guage coil - it is very sensitive. Just = rotating it in free space gives quite a bump due to interaction with the = earths magnetic feild. With a cheap pacemaker type donut magnet - I can = get an inflection at 8 ft away... I've got the layout done for a board, = but have been too busy to do the final review of it before sending it to = the board house. I should be able to do this sometime in March. Jim Esler ----- Original Message -----=20 From: Steve Hammond=20 To: psn-l@................. Sent: Tuesday, February 06, 2001 4:43 PM Subject: BasicStamp question Has anybody incorporated a BasicStamp micro in the construction of = their seismograph, tools, amplifiers, or A/D?=20 Regards, Steve Hammond -- PSN Aptos, California=20
Steve,
I've got a prototype of a stamp seisograph = designed.  I'm=20 using a 24 ADC, a programmable gain amp and the stamp to send rs-232 = data to my=20 PC.  The coil is a 30,000 turn 42 guage coil - it is very = sensitive. =20 Just rotating it in free space gives quite a bump due to interaction = with the=20 earths magnetic feild.  With a cheap pacemaker type donut magnet - = I can=20 get an inflection at 8 ft away...  I've got the layout done for a = board,=20 but have been too busy to do the final review of it before sending it to = the=20 board house.  I should be able to do this sometime in = March.
 
Jim Esler
----- Original Message -----
From:=20 Steve=20 Hammond
Sent: Tuesday, February 06, = 2001 4:43=20 PM
Subject: BasicStamp = question

Has = anybody incorporated=20 a BasicStamp micro in the construction of their seismograph, = tools,=20 amplifiers, or A/D? 
Regards, Steve = Hammond --=20 PSN Aptos,=20 California 
Subject: Re: BasicStamp question From: barry lotz gbl@....... Date: Wed, 07 Feb 2001 06:12:59 -0800 Hi Steve I haven't tried a Basic stamp chip since I have been looking of a very low power 16 bit controller with memory but I think one can transfer an *.exe file to a stamp and run it. Any issue of Circuit Cellar magazine has several reasonably priced boards advertized. Several have a DiskOnChip which is a several mb solid state chip at a very reasonable price. I think this would be great used with a program like SDR and web linked to ones main computer. Regards Barry Steve Hammond wrote: > Has anybody incorporated a BasicStamp micro in the construction of > their seismograph, tools, amplifiers, or A/D? Regards, Steve Hammond > -- PSN Aptos, California Hi Steve
   I haven't tried a Basic stamp chip since I have been looking of a very low power 16 bit controller with memory but I think one can transfer an *.exe file to a stamp and run it. Any issue of Circuit Cellar magazine has several reasonably priced boards advertized. Several have a DiskOnChip which is a several mb solid state chip at a very reasonable price. I think this would be great used with a program like SDR and web linked to ones main computer.
Regards
Barry
 

Steve Hammond wrote:

Has anybody incorporated a BasicStamp micro in the construction of their seismograph, tools, amplifiers, or A/D? Regards, Steve Hammond -- PSN Aptos, California
Subject: Re: tiltmeter sensitivity From: sean@........... Date: Wed, 7 Feb 2001 22:37:17 -0600 (CST) Ian, Now that you have mentioned that your tiltmeter is probably an electrolytic bubble, I meant to mention that most of these have complex electrode/ electrolyte chemistry and must be operated as an AC bridge. If you are inclined to probe circuits with a multimeter, do NOT try to measure the electrode resistance with a DC ohm-meter. The slightest DC current will ruin the sensor by plating the coating off the electrodes. This is of particular concern for anyone who finds the biaxial Rockwell sensor in an electronics surplus store, since the electrodes are plated onto the curved glass surface, and will disappear almost instantly if a meter is applied. In fact, it may already be ruined inside the SS shell. I can supply the schematic to properly operate this bubble. Sean-Thomas __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: tiltmeter sensitivity From: ian ian@........... Date: Wed, 07 Feb 2001 18:43:22 -1000 Hi, thanks. I have the proper drive electronics boxes which come with these. So no worries, but a good general point to note. The other thing I didn't mention was that the documentation claims that the devices have infinite resolution. Limited, obviously, by the electronics. Cheers Ian Smith sean@........... wrote: > Ian, > > Now that you have mentioned that your tiltmeter is probably an electrolytic > bubble, I meant to mention that most of these have complex electrode/ > electrolyte chemistry and must be operated as an AC bridge. If you are > inclined to probe circuits with a multimeter, do NOT try to measure > the electrode resistance with a DC ohm-meter. The slightest DC current > will ruin the sensor by plating the coating off the electrodes. This is > of particular concern for anyone who finds the biaxial Rockwell sensor > in an electronics surplus store, since the electrodes are plated onto the > curved glass surface, and will disappear almost instantly if a meter is > applied. In fact, it may already be ruined inside the SS shell. I can > supply the schematic to properly operate this bubble. > > Sean-Thomas > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: lehman From: "Larry Cochrane" cochrane@.............. Date: Wed, 7 Feb 2001 23:05:55 -0800 ----- Original Message ----- From: "Doug Crice" To: Sent: Wednesday, February 07, 2001 11:17 AM Subject: Re: lehman > OK, I stuck the Lehman manual on my web page in pdf format. > > http://www.georadar.com/Lehman_manual.PDF (case sensitive) > > I would invite Larry to give it a permanent home on the PSN site. Links to the pdf file have been added to my site here http://www.seismicnet.com/lehman.html. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Ground water anomalies From: himanshu joshi himjo2001@......... Date: Fri, 9 Feb 2001 06:38:53 -0800 (PST) Dear all, I am a new subscriber to the PSN list and am finding myself awed by the volume of information going to and fro. More so, as I am an amateur. But still, I would like to stay on and learn a bit. May be you all may help me understand somethings that are intriguing me regarding earthquakes. First, I am from India and live near Gujarat state, which was rocked on January 26 by a devastating quake. What I want to know is about the relation between anomolous behaviour of ground water with seismic activity. I read in a book that there is a research going to predict earthquakes by studying the behaviour of ground water table (shifting places, etc) before the tremors. I understand that there is a strong link, and changes in ground water level can be traced 3-4 months before the main shock. Can somebody fill me up on this. Sorry, if I sound like an idiot. In that case please correct me. Himanshu __________________________________________________ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Forensic Seismology From: RLLaney@....... Date: Fri, 9 Feb 2001 10:07:41 EST Hello all: I would like to bring to the attention of the group two interesting articles on forensic seismology and the sinking of the Russian submarine Kursk. They are: Forensic Seismology and the Sinking of the Krusk, EOS, Transactions, American Geophysical Union, Volume 82, Number 4, Page 37, January 23, 2001, and Forensic Seismology, Sinking of the Kursk, Geotimes, February 2001, page 6. The EOS article contains the details of the evaluation of seismic data and the explosions on board the Krusk and the Geotimes article is a one-page summary. Bob Laney Herndon, VA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Ground water anomalies From: John Hernlund hernlund@............ Date: Fri, 09 Feb 2001 12:31:22 -0800 In several cases water table levels were observed to change prior to earthquakes, but I don't know that there is a high correlation in this. The water table always wants to achieve an equipotential surface, as well as fill in any pore space it can with the volume of water in the ground. Perhaps prior to earthquakes the pores change their shape due to strain, and this will cause a change in the water table level. If the strain is extensional, pore space will increase and the water table will drop, if it is contractional then pore space will decrease and the water table will rise. However, there is a flip side to the coin...how changes in water table levels might affect the frictional behavior and state of stress on a fault. So there is give and take here...pretty complicated like everything else having to do with quakes. The presence of even a small amount of water is known to drastically alter the behavior of faults and of materials as a whole. The tendency is towards lower friction and softer rheology. Some people (like myself) think that the abundance of water is the only reason the Earth has plate tectonics in the first place...without it the crust should freeze up and have a rigid lid similar to Mars. But water reduces the viscosity and strength in a focused manner, which creates weak zones (plate boundaries) along which plates can move relative to one another. In mantle convection, the idea is that the top is cooled by being near the surface, which makes it more dense and it will have a tendency to sink if given the opportunity...and water provides this opportunity by weakening certain zones (subduction zones) where crust is returned to the mantle. At any rate, I hope people continue researching water tables and earthquakes as well as any other data that can be collected. The more data we have, the better the picture gets. John Hernlund Department of Earth and Space Sciences University of California, Los Angeles hernlund@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: tiltmeter sensitivity From: ian ian@........... Date: Fri, 09 Feb 2001 20:00:49 -1000 Hi, I now have my filter connected and have made some measurements: The gain presented by the filter is actually around 1000 taking into account the natural losses caused by the filtering. The noise signal presented to my A/D is about 35 mV peak to peak. This means 35 microV coming out of the tilt meter system which equates to about 300 nanoRad. pk to pk. Plugging this noise figure into Sean's formula this works out to be a descernable quake of 5.7 Mag for a signal to noise ratio of 20. [I think I got the sums right!] I tried standing next to it, for > 20 seconds, about 2 feet away and at 45 degrees to the axis of tilt. This generated a signal of 130 mV pk to pk, or 6.2 microRad. Correcting an earlier mistake, my A/D is set to +/- 200 mV 12 bits. So, I'm just waiting for the next event... Thanks Ian Smith __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Ground Water From: wizard@......... (Michael Duck) Date: Sat, 10 Feb 2001 04:40:58 -0800 First, I am from India and live near Gujarat state, which was rocked on January 26 by a devastating quake. What I want to know is about the relation between anomolous behaviour of ground water with seismic activity. I read in a book that there is a research going to predict earthquakes by studying the behaviour of ground water table (shifting places, etc) before the tremors. I understand that there is a strong link, and changes in ground water level can be traced 3-4 months before the main shock. Can somebody fill me up on this. Sorry, if I sound like an idiot. In that case please correct me. Himanshu There is a paper by Eddie Quilty at the USGS in Menlo Park. Title: Water Level and Strain Changes Preceding and Following the August 4, 1985 Kettleman Hills, California Earthquake. Authors Evelyn Roeloffs and Eddie Quilty A Report from Pure Applied geophys. 149 (1997) 21-60 033-4553/97/010021-36 It has some very interesting information on well levels. I think there were also some articles years ago in Scientific American Magazine that discussed well levels and earthquakes. Michael Duck Tuolumne Utilities District Telemetry Networking Systems Sonora, CA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Ground water anomalies From: Frank Condon frankcnd@.......... Date: Sat, 10 Feb 2001 19:46:36 +0000 Hello Himanshu: Here's an interesting report from a scientific study done for the Southern California area in the United States. Fluid Pressure Variations Induced by Deformation: San Jacinto Fault zone, California, 1978-1985 Groundwater Level Changes Associated With Seismicity In The Anza Region http://erp-web.er.usgs.gov/reports/annsum/vol39/pt/g3087.htm Regards, Frank Condon GSL At 06:38 AM 2/9/01 -0800, you wrote: >Dear all, >I am a new subscriber to the PSN list and am finding >myself awed by the volume of information going to and >fro. More so, as I am an amateur. But still, I would >like to stay on and learn a bit. May be you all may >help me understand somethings that are intriguing me >regarding earthquakes. >First, I am from India and live near Gujarat state, >which was rocked on January 26 by a devastating quake. >What I want to know is about the relation between >anomolous behaviour of ground water with seismic >activity. I read in a book that there is a research >going to predict earthquakes by studying the behaviour >of ground water table (shifting places, etc) before >the tremors. I understand that there is a strong link, >and changes in ground water level can be traced 3-4 >months before the main shock. Can somebody fill me up >on this. >Sorry, if I sound like an idiot. In that case please >correct me. >Himanshu > >__________________________________________________ >Do You Yahoo!? >Get personalized email addresses from Yahoo! Mail - only $35 >a year! http://personal.mail.yahoo.com/ >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. GSL __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Ground water anomalies From: RLLaney@....... Date: Sat, 10 Feb 2001 15:17:27 EST In a message dated 2/9/01 9:39:24 AM Eastern Standard Time, himjo2001@......... writes: << Dear all, I am a new subscriber to the PSN list and am finding myself awed by the volume of information going to and fro. More so, as I am an amateur. But still, I would like to stay on and learn a bit. May be you all may help me understand somethings that are intriguing me regarding earthquakes. First, I am from India and live near Gujarat state, which was rocked on January 26 by a devastating quake. What I want to know is about the relation between anomolous behaviour of ground water with seismic activity. I read in a book that there is a research going to predict earthquakes by studying the behaviour of ground water table (shifting places, etc) before the tremors. I understand that there is a strong link, and changes in ground water level can be traced 3-4 months before the main shock. Can somebody fill me up on this. Sorry, if I sound like an idiot. In that case please correct me. Himanshu >> Hello Himanshu: If you have access to a technical library, you might get a copy of a recent textbook on ground water hydrology or hydrogeology. These books usually have a section that discusses earthquakes and their effects on ground water. For example, the book that I have handy is: Physical and Chemical Hydrogeology, by Patrick A. Domenico and Franklin W. Schwartz (John Wiley and Sons publishers). The authors discuss earthquakes and ground water on pages 313-315 and cite a number of reports on the subject. Hope this is helpful. Bob Laney Herndon, Virginia __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Ground Water From: johnc c cole johnccole1@........ Date: Sat, 10 Feb 2001 15:22:42 -0600 Himanshu This is not an answer to your question but it is related to it . At this time i have a well and a seismic detector designed for that use . I believe that someone has tried it before. Should i expect it to function ? What say ye all? John W5AUH ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Fwd: Re: More Info on Seisomemeters and Seismographs From: The Lahrs johnjan@........ Date: Tue, 13 Feb 2001 22:14:18 -0700 Does anyone have any other suggestions for Jhaveri? He's not on the PSN list, so you'll need to write to him directly. John >Subject: Re: More Info on Seisomemeters and Seismographs >To: jhaverialay@......... >Cc: lahr@......... zirbes@.................... cochrane@............... > john@........ > >Dear Jhaveri, > >Many amateurs run their own seismograph stations, so it is >definately possible. If you have access to the web, then a >good place to start is this web page of the Public Seismic >Network (PSN): http://psn.quake.net/ > >On this page you will see that there is an Email list for >the PSN that you could sign up for. The many amateurs on >this list exchange information on building and running >seismic equipment. If you don't have web access, then send >a message to Larry Cochrane (cochrane@............... and he >can add you to the list. > >This web site describes a home-built seismic system: >http://lahr.org/john-jan/psn/gldn_psn.html > >Most systems today rely on having a PC computer to record >the data digitally. It is much more difficult to build >one that writes a paper record directly. > >I'll mail you some information on earthquakes in general and >the Indian earthquake in particular. > >Best of luck, >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@................... /################################### > > > > > > Subject: > > More Info on Seisomemeters and Seismographs > > Date: > > Thu, 1 Feb 2001 23:12:08 -0800 (PST) > > From: > > Jhaveri Alay > > To: > > zirbes@........ > > CC: > > jhaverialay@......... > > > > > > > > > > >From : jhaverialay@......... > > To : zirbes@........ > > Date : Friday, February 2nd, 2001 > > Subject : More Info on Seisomemeters and Seismographs > > > > Hello Sir, > > > > I am a resident of Ahmedabad city in the state of > > Gujarat, INDIA, where the 26th January earthquake and > > many aftershocks have been felt. Is there any way of > > constructing a seismomemeter from scratch or any other > > instrument that would record earthquakes and > > aftershocks. Please help me in finding a way to do > > this. Is there any way to setup a seismo monitoring > > station in Ahmedabad by me through technical help from > > you. > > > > Also How I can be helpful to you after this technical > > data is available to me. > > > > Could you send me information on the following : > > > > * How to construct a seismomemeter ? > > * Why are Earthquakes caused ? > > * Information on Earthquake Zones in India ? > > * A copy of the seismographs showing the 26th January > > Bhuj Earthquake > > > > Please, if you can send me this data and information > > through ordinary post as > > telecommunications are still slow. > > > > My Mailing Address is : > > > > Alay Pankaj Jhaveri, > > B-23, Satellite Apartments, > > Jodhpur Road, > > Ahmedabad-380015, > > Gujarat, INDIA. > > > > Thanking you very much. > > > > - Alay Pankaj Jhaveri > > Email : jhaverialay@......... > > Mailing Address : B-23, Satellite Apartments, Jodhpur > > Road, Ahmedabad-380015, Gujarat, INDIA. John C. Lahr 1925 Foothills Road Golden, CO 80402 (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New WinQuake beta release From: "Larry Cochrane" cochrane@.............. Date: Thu, 15 Feb 2001 00:56:01 -0800 Greetings, Today I released a new beta release of WinQuake. The version number is 2.7.3 with a release date of 2/14/2001. You will find download links on this page: http://www.seismicnet.com/software.html. Please see the readme.txt file in the release zip file for installation information. This is what's new in this beta release; Several cosmetic changes have been made to some of the new dialog boxes. Thanks to Karl Cunningham for pointing them out. I increased the maximum number of samples WinQuake will read in. It was set to 250k, it's now set to 2 million. I added support for a new PSN Historical database. I am now running an event database server that WinQuake can access. This is similar to the server at binghamton.edu except my server goes back to 1980, binghamton.edu only goes back about 2 years, and my server has more information like the magnitude type (Ml, Mw etc.) and the reporting agency. The database information comes from Council of the National Seismic System (CNSS). See http://www.cnss.org for more information. The actual database files that I process once a day (at midnight local time) are stored on the Berkeley Seismo Lab system. You can see what the raw files look like by going to this site: ftp://quake.geo.berkeley.edu/pub/catalogs/cnss/. To seed the process I pulled and processed all of the files from 1980 to present. I process the files by parsing out the important information and save the data in binary format. I also filter out any events below magnitude 2.5. Now once per day my system checks for any updated files on the Berkeley system. The event database server I am running has two limitations. It will only handle up to 5 connections at any one time and it will only send out 1000 events per request before disconnection. This is to limit the memory and bandwidth utilization on my system. To use the historical lookup feature go to the Event Report dialog box and then select the Load Network Report button. In the Network Report dialog box select one of the three data@ services list in the Network Service list box. The two new items are data@.................... (PSN Historical Data) and data@.................. (PSN Historical Data Backup). Both servers actually come to the same NT system here at my house. They differ in the IP address used to get here. I'm not sure if I ever sent out an email about this. I have two DSL lines now coming to my house using different ISPs. This gives me a little more redundancy to send and receive data over the Internet. You have two options when you select one of the historical servers. If you have an event display window open when opening the Network Report dialog box, you can select the Connect button and WinQuake will request all events around the start time of the event file. If you select the Historical button, you will get another dialog box that allows you to request data based on a start and end time. You can also filter the data request based on the magnitude. I will be adding a location filter soon. If you open the Network Report dialog box when no event files are being displayed, the Connect button does the same thing as the Historical button. Please let me know if you run into any problems with the new release. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Yahoo! Auto Response From: jhaverialay@......... Date: Thu, 15 Feb 2001 00:55:51 -0800 (PST) Subject: Re: BasicStamp question From: Ed Thelen ethelen@........ Date: Thu, 15 Feb 2001 23:02:16 -0800 Steve Hammond wrote: > > Has anybody incorporated a BasicStamp micro in the > construction of their seismograph, tools, amplifiers, > or A/D? > Regards, Steve Hammond -- PSN Aptos, California About 10 years ago I got tired of re-leveling a garden-gate type seismograph (a one vertical post "Lehman") that was more stable than its base. (A machine adjusted to 20 second period on a house slab needs daily re-leveling in changeable weather.) I used the BasicStamp to: a) send a re-leveling indication to the ADC b) short the sense coil c) turn on 2 infra-red LEDs used to help sense the pendulum position d) sense the relative outputs of two infra-red photo cells using an RC circuit BasicStamp AtoD recommended at the time e) operate a highly geared down stepping motor to move the leveling more toward nominal pendulum position f) undo c) above, then b), then a) g) go back to sleep for a day Results of the experiment. a) BasicStamp ALMOST had the drive to operate the stepping motor reliably - had to go to higher current drive to gain 100% drive reliability b) photo sensing using the old recommended BasicStamp circuit is a bitch !! - temperature sensitivity - sensitivity to ambient light - sensitivity to everything even using differential circuitry did not yield the kind of reliability and stability and demonstratability that I wanted. Then I discovered the Internet, and my interests changed. If I were going to do it again - a) more conventional AtoD than offered by the old BasicStamp - like a real amplifier and a real ADC (or a more modern BasicStamp?) b) pay more attention to the optics so that I can show the thing working to my friends in normal light. or c) tap into the data from a professionally operated machine installed in a quiet location (2000 miles from a sea coast OR install a 0.2 to 0.1 Hertz notch filter). Cheers Ed Thelen - Fremont, CA ethelen@........ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New Manual of Seismological Observatory Practice From: The Lahrs johnjan@........ Date: Fri, 16 Feb 2001 20:23:05 -0700 There is an updated Manual of Seismological Observatory Practice that is being written now. Here's the URL with the text as it stands now: John John C. Lahr 1925 Foothills Road Golden, CO 80402 (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: collecting seismic data on my computer From: "Ed Ianni" edwianni@........ Date: Fri, 16 Feb 2001 22:43:18 -0500 Hi Everyone; I have just completed my first home built seismograph and I am = feeding it into a chart recorder. I would now like to feed it into my = computer but I don't know where or how to start. Any simple clear cut = advice would help and be appreciated. Thank you very much. Ed. =20
Hi Everyone;
    I have just = completed my first=20 home built seismograph and I am feeding it into a chart recorder. I = would now=20 like to feed it into my computer but I don't know where or how to start. = Any=20 simple clear cut advice would help and be appreciated. Thank you very = much.=20 Ed.
    =
Subject: Re: collecting seismic data on my computer From: Dan phyrekraker@........ Date: Fri, 16 Feb 2001 23:08:59 -0700 I read somewhere (Nuts & Volts I think) that a decent sound card can be used for data acquisition. Perhaps someone on the list with a lot more knowledge of these things could expand on this a bit more. Sincerely, Dan Armeneau Ed Ianni wrote: > Hi Everyone; I have just completed my first home built seismograph > and I am feeding it into a chart recorder. I would now like to feed it > into my computer but I don't know where or how to start. Any simple > clear cut advice would help and be appreciated. Thank you very much. > Ed. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: collecting seismic data on my computer From: Dan phyrekraker@........ Date: Fri, 16 Feb 2001 23:14:06 -0700 So Sorry! Didn't mean to send the original reply as an attachment. Below is the reply as it should be: I read somewhere (Nuts & Volts I think) that a decent sound card can be used for data acquisition. Perhaps someone on the list with a lot more knowledge of these things could expand on this a bit more. Sincerely, Dan Armeneau __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: collecting seismic data on my computer From: "Mark Robinson" other@............... Date: Sat, 17 Feb 2001 22:54:51 +1300 I've been thinking about this for a long time with a view to having a play and a talk to Larry about it. I can't see any reason that shorting out the coupling capacitors on the input to a sound card (or some similar simple modification) should not render it a very useful Analog to Digital Convertor. One fine day I must figure out how to program the scummy things. Mark ----- Original Message ----- From: "Dan" To: Sent: Saturday, February 17, 2001 7:14 PM Subject: Re: collecting seismic data on my computer > So Sorry! Didn't mean to send the original reply as an attachment. Below > is the reply as it should be: > > I read somewhere (Nuts & Volts I think) that a decent sound card can be > used for data acquisition. Perhaps someone on the list with a lot more > knowledge of these things could expand on this a bit more. > > Sincerely, > > Dan Armeneau > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: STS-2 Manual From: ACole65464@....... Date: Sat, 17 Feb 2001 10:19:25 EST Hello Everyone, While searching the Web during the week I came across an item that may be of interest to some of you instrument builders out there. Someone had scanned a 12 page manual for the Streckeisen STS-2 seismometer as a PDF file, and placed it on the Web for the world to see. The document took several minutes to retrieve on my home PC, but was worth the wait. Go to: http://lsuligo.phys.lsu.edu/stiffs/sts-2.PDF It should provide some food for thought. Regards Allan Coleman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: collecting seismic data on my computer From: CapAAVSO@....... Date: Sat, 17 Feb 2001 12:48:37 EST In a message dated 2/16/01 10:48:51 PM Eastern Standard Time, edwianni@........ writes: << Hi Everyone; I have just completed my first home built seismograph and I am feeding it into a chart recorder. I would now like to feed it into my computer but I don't know where or how to start. Any simple clear cut advice would help and be appreciated. Thank you very much. Ed. >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Hi Ed, Like you I have just completed a home built seismograph. it is a vertical leaf-spring seismograph made from the plasterer's trowel Sean Thomas recommends. I first checked it out with an oscilloscope to see that it was putting out a signal and now I am recording it with "Windaq", a ~$100 Radio Shack A/D converter and software that converts a computer into a strip-chart recorder. Windaq is good enough for me to see that I am not recording the 6-second microseisms. My amplifier is an AD524 instrument amplifier. The "Windaq" converter shows me I need more amplification. After I get this thing recording the 6-second microseisms and its magnetic damping correctly adjusted, I'll probably replace Windaq with Larry's SDR program. Have fun and good luck, Cap __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: collecting seismic data on my computer From: Karl Cunningham karlc@.......... Date: Sat, 17 Feb 2001 12:44:05 -0800 Give it a try -- I think a number of us would be interesed in the results. I imagine that the low-frequency performace might leave a lot to be desired -- drift, temperature effects, etc., just because that sort of thing isn't important when building a sound card and costs extra to achieve. Karl At 23:14 2/16/2001 -0700, you wrote: >I read somewhere (Nuts & Volts I think) that a decent sound card can be >used for data acquisition. Perhaps someone on the list with a lot more >knowledge of these things could expand on this a bit more. > >Sincerely, > >Dan Armeneau __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: collecting seismic data on my computer From: "David Saum" DSaum@............ Date: Sat, 17 Feb 2001 16:28:26 -0500 > From: Dan > Date: Fri, 16 Feb 2001 23:08:59 -0700 > > I read somewhere (Nuts & Volts I think) that a decent sound card can be > used for data acquisition. Perhaps someone on the list with a lot more > knowledge of these things could expand on this a bit more. > Hmmm... bad idea. Sound cards have a few properties that make them > good sound cards, but bad data acquisition cards. There may be a problem with using sound card a/d for seismic data. I found a note on the web that > Sound cards have a few properties that make them > good sound cards, but bad data acquisition cards. > > - input is generally heavily filtered, with unknown filters, but > generally cut out anything below 20 Hz, around 50 or 60 Hz (depending > on your local line frequency), and above 10 kHz. The <20 Hz > filter is nasty, since it makes DC measurements impossible. If all you need is an a/d for your amplified and filtered data, then you might consider the $99 DataQ 12 bit a/d box with serial IO: http://www.dataq.com/cgi-local/SoftCart.exe/products/startkit/di151rs.htm?E+ scstore Radio Shack carries it. Search for part #910-4932 at http://www.radioshack.com I believe that Alan Jones has recently modified his Amaseis freeware to work with the DataQ: http://www.geol.binghamton.edu/faculty/jones/as1.html I am working on an inexpensive electronics board for seismic amp/filter/adc/serialIO with an 8 pole bessel filter and 16 bit adc that can process Lehman or geophone data. If you want to be a beta tester, I can sell you one for $99 that comes wired to a 9k pickup coil, and needs no power supply since it gets power from the PC serial port. For Lehman processing I generally set the LP to 1 Hz and the SPS to 8. All you do is mount the coil in your magnet field and plug the DB9 connector into your PC serial port. The output is compatible with Amaseis. Hope this helps, Dave __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Lehman From: "JORD" jord@............ Date: Sun, 18 Feb 2001 12:51:50 -0500 I have put together the upright apparatus for the Lehman instructions = from May 2000. I have the upright apparatus together now, but the 6" pipes that connect = to the t-joints and elbows are some what lose. Is this ok? Thank You Randy =20
I have put together the upright = apparatus for the=20 Lehman instructions from May 2000.
I have the upright apparatus = together now, but=20 the 6" pipes that connect to the t-joints and elbows are some what=20 lose.
Is this ok?
 
Thank You Randy
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Subject: RE: Lehman From: steve hammond shammon1@............. Date: Sun, 18 Feb 2001 10:37:04 -0800 Hi Randy, If you can turn them by hand they might be too lose. The object is to make the frame as solid as you can. While I don't use them, I have noticed that some folks use two angle braces between the base plate and the upright (as seen in Larry's design). Keep in mind the any change during operation might change the setting of the seismograph. The torque of the boom with a 5 pound mass will make the frame twist if it is not tight. If it is just a ting with the pipe threads, you might try adding a little teflon tape or even epoxy to threads before assembly. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: JORD [SMTP:jord@............. Sent: Sunday, February 18, 2001 9:52 AM To: psn-l@.............. Subject: Lehman << File: ATT00000.html >> I have put together the upright apparatus for the Lehman instructions from May 2000. I have the upright apparatus together now, but the 6" pipes that connect to the t-joints and elbows are some what lose. Is this ok? Thank You Randy __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: BasicStamp question From: steve hammond shammon1@............. Date: Sun, 18 Feb 2001 11:34:54 -0800 Thanks to all that responded to my question. I have been looking at the BasicStamp to drive an interface to a non PC based seismic data collection device, the "shoebox seismograph". During the early days of the PSN, there was a lot of discussion about such a device. The concept being, the shoebox would sit and collect data and then report-in and send the data to a central repository after an event. This low cost sensor could also connect directly to a PC serial interface. In my design, (still on the drawing board stage ) the BasicStamp controls a MAX171 serial A/D and the adjustable gain by means of a Dallas semi DS1669 digital rheostat. The data is stored in a serial (Xicor X25640) 8kB EEPROM. Has anybody done anything similar? Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Ed Thelen [SMTP:ethelen@......... Sent: Thursday, February 15, 2001 11:02 PM To: psn-l@.............. Subject: Re: BasicStamp question __________________________________________________________ Subj:New PSN Server From: cochrane@.............. (Larry Cochrane) Time 20/02/01 06:33:12 GMT Standard Time Hi all, Last night I replaced the PSN server system. The old one was getting a little slow doing all of the different services it was handling and it would randomly crash very few days. Since I wasn't sure if the system crashes were caused by bad hardware or software I replaced both. I'm still using NT Server, just a fresh copy of it on a new disk and CPU board. I think I have everything transferred to the new system. Please let me know if you run into any problems with my PSN web site (www.seismicnet.com) or with the PSN email server. Regards, Larry Cochrane __________________________________________________________ Subj:Re: Ground Water From: bfryer@............ (Bob Fryer) Date: 20/02/01 06:33:33 GMT Standard Time Himanshu, These items are from my bibliography: Wakita, Hiroshi, "Changes in Groundwater Level and Chemical Composition," in Earthquake Prediction Techniques, Their Application in Japan, Asada, Toshi (Editor) Masako Ohnuki, Translator, Tokyo: University of Tokyo Press, 1982. Radon! See p179 for Uranium decay series (Radon gas). See p82 re: stage of process. 0-86008-290-3 Roeloffs, E.A., S.S. Burford, F.S. Riley and A.W. Records, "Hydrologic effects on water level changes associated with episodic fault creep near Parkfield, California," J. Geophys. Res., v94, pp12,387-12,402, 1989. Woodcock, Douglas and Evelyn Roeloffs, "Seismically induced water-level oscillations in a fractured-rock aquifer well near Grants Pass, Oregon," in Oregon Geology, v58, n2, March 1996, pp27-33. Analog and/or digital recorders in well NVIP3 record earth tides, and quakes from around the Pacific Rim. I have received anecdotal reports of groundwater levels rising about 12-24 hours before the M5.3 Scotts Mills, Oregon quake, March, 1993. The event rattled my head and bed... Take care, Bob F >First, I am from India and live near Gujarat state, >which was rocked on January 26 by a devastating quake. >What I want to know is about the relation between >anomolous behaviour of ground water with seismic >activity. I read in a book that there is a research >going to predict earthquakes by studying the behaviour >of ground water table (shifting places, etc) before >the tremors. I understand that there is a strong link, >and changes in ground water level can be traced 3-4 >months before the main shock. Can somebody fill me up >on this. >Sorry, if I sound like an idiot. In that case please >correct me. >Himanshu ----- earthquake WARNING research ----- --- animals, people, scientific evidence --- --- http://www.earthquakewarning.org --- ______________________________________________________ Subj: RE: BasicStamp question Date: 20/02/01 06:33:33 GMT Standard Time From: mariottim@............ (Mariotti Mauro) Steve, This is a good idea but I think that 8Kb are too few. Consider that 8k at 16bits are 4k samples. At rate of 5sps your memory become longer as 819 seconds equal to 13 minutes of continuous recording. In one single (small) teleseismic event you filled the entire memory. I think that you need at least 256Kbytes stored in a static ram bank. Also the choice of EEPROM (limited in speed of writing and number of writings allowed) limit your project. Anyway all depend of what kind of experiments you wants to do. Regards, Mauro, Perugia, IESN Italy www.iesn.org At 11:34 2001/02/18 -0800, you wrote: >Thanks to all that responded to my question. I have been looking at the >BasicStamp to drive an interface to a non PC based seismic data collection >device, the "shoebox seismograph". During the early days of the PSN, there >was a lot of discussion about such a device. The concept being, the >shoebox would sit and collect data and then report-in and send the data to >a central repository after an event. This low cost sensor could also >connect directly to a PC serial interface. In my design, (still on the >drawing board stage ) the BasicStamp controls a MAX171 serial A/D and the >adjustable gain by means of a Dallas semi DS1669 digital rheostat. The >data is stored in a serial (Xicor X25640) 8kB EEPROM. Has anybody done >anything similar? >Regards, Steve Hammond PSN Aptos, CA > > >-----Original Message----- >From: Ed Thelen [SMTP:ethelen@......... >Sent: Thursday, February 15, 2001 11:02 PM >To: psn-l@.............. >Subject: Re: BasicStamp question > > >__________________________________________________________ Subject: Re: STS-2 Manual From: ChrisAtUpw@....... Date: Mon, 19 Feb 2001 20:49:15 EST Hello Allan, There is also a paper giving background noise records on this site which may be worth reading. http://lsuligo.phys.lsu.edu/stiffs/Low_noise_model.pdf The Glasgow file is an apparatus to detect gravitational pulsations due to supernovae etc. Regards, Chris >In a message dated 17/02/01, ACole65464@....... writes: > http://lsuligo.phys.lsu.edu/stiffs/ ___________________________________________________ Subj: Re: New PSN Server Date: 20/02/01 07:03:55 GMT Standard Time From: sean@........... Larry, We all appreciate your efforts. Thanks. Sean-THomas Morrissey, St. Louis University __________________________________________________________ Subj: File Format Conversion Date: 24/02/01 17:57:24 GMT Standard Time From: dwebb2@.............. (Dick Webb) Hi, Does anyone know of software that could create a record section from data files in the SDR format. Or, programs to convert from SDR into other formats that could then be used with software to make a record section. Dick __________________________________________________________ Subj: Northern Cal event Date: 25/02/01 23:27:16 GMT Standard Time From: cochrane@.............. (Larry Cochrane) All, We just had a moderate event around here. Hit around 3:20 PM local time (23:20 UTC). Even though the TV was on I heard the P wave and definitely felt the S wave. Here's the auto report from Berkeley: 01/02/25 23:18:22 37.33N 121.70W 7.8 4.4Ml A* 18 km E of San Jose, CA -Larry Cochrane __________________________________________________________ Subj: RE: Northern Cal event Date: 26/02/01 04:15:42 GMT Standard Time From: shammon1@............. (steve hammond) Hi Larry - thanks for the update. It was also felt strong in Aptos 43km SW of the epicenter which was on the Calaveras Fault. It felt like two events space closely together. A smaller event followed by a larger event. Regards, Steve Hammond PSN Aptos, California -----Original Message----- From: Larry Cochrane [SMTP:cochrane@............... Sent: Sunday, February 25, 2001 3:27 PM To: psn-l@.............. Subject: Northern Cal event All, We just had a moderate event around here. Hit around 3:20 PM local time (23:20 UTC). Even though the TV was on I heard the P wave and definitely felt the S wave. Here's the auto report from Berkeley: 01/02/25 23:18:22 37.33N 121.70W 7.8 4.4Ml A* 18 km E of San Jose, CA -Larry Cochrane __________________________________________________________ Subj: Complete Seismic System For Sale Date: 26/02/01 05:12:54 GMT Standard Time From: doug@............. (Doug Sutherland) PSN-L folks, I have a seismic system based on Larry Cochrane's boards that I want to sell. I like the system a lot, but my interests have shifted towards other things. This is a complete system that includes a PC running SDR, amplifier/filter board, 16-bit A/D card, and two geophones. I am also including Larry's radio telemetry demodulator board. - The amplifier/filter board was purchased from Larry for $190. It is the three channel version, it is enclosed in a plastic case, and it has the necessary AC/DC adapter. http://www.seismicnet.com/eqamp.html - The A/D card was purchased from Larry for $245. It is the 16-bit version that works with Larry's SDR program. http://www.seismicnet.com/atod.html - The radio telemetry board was purchased from Larry for $150. It includes the necessary AC/DC adapter but does not include a radio scanner. The board is enclosed in a plastic case. http://www.seismicnet.com/telebrd.html - The two geophones were purchased as part of a group buy among this crowd. I can't remember the price but I think it was somewhere around $330. One of the geophones is an HS-10-1 (large cylinder) which I believe is 1hz. The other geophone is the type with a spike on the bottom, but I can't recall what the specs are. - The PC is a 233Mhz Pentium with 32MB RAM in a tower case, put together from off-the shelf parts. It has a VGA card and ethernet card, and it's pre-loaded with windows, and runs SDR in DOS mode. - The system also comes with some long coaxial cables to connect the geophones. I believe they are 50 feet long. This is a plug and play system that includes everything to start monitoring quakes immediately. The only thing needed to get it up and running is a VGA monitor and keyboard. These can easily be shared with another PC using one of the belkin Omni-Cube units that allow you to switch the keyboard and monitor between multiple PCs. I am selling the complete system for $600 because I need the cash. This is less thant half of the original cost. The buyer is required to pay shipping from Los Gatos CA. If I receive multiple replies, the first to reply get the deal. Let me know if you're interested. Thanks, Doug __________________________________________________________ Subj: Re: Complete Seismic System For Sale Date: 26/02/01 06:29:38 GMT Standard Time From: doug@............. (Doug Sutherland) On Sun, 25 Feb 2001, you wrote: > Hi Doug: I'm interested. Please contact me. Hi Frank. It's yours if you want it. Please let me know where you are located so I can figure out shipping cost. If you have any questions, let me know. -- Doug __________________________________________________________ Subj: wondering? Date: 26/02/01 13:33:08 GMT Standard Time From: edwianni@........ (Ed Ianni) I recently completed my Lehman seismograph. I don't know if it is tuned properly. Yesterday there was a "quake" in Ca. I believe of 4.4 mag. I live in south NJ and did not detect it. Was it of sufficient Mag. that I should have picked it up? Thanks, Ed. ______________________________________________ Subj: Re: wondering? Date: 26/02/01 17:49:37 GMT Standard Time From: johnccole1@........ (johnc c cole) Ed Probably not. NO.1 it could have been too weak. NO.2 the detector could be over dampened and has lost sensitivity. Here is how i set the Leaman up to check it out. Walk up to the detector ,turn around and walk away. The trace should move from the center over to one side and back to the center and on past it over to the other side and back to the center and stop. If it moves two or three times back and forward across the screen ( or chart paper ) add more damping . Ed, the one test to see if the detector is working properly is the walk up test. If you do a walk up and you get a full deflection from the top of the screen to the bottom or all the way across the chart paper max. magnitude both ways and resumes the normal trace, it is working correctly. Now, if you do not get a full deflection , say about half way across and back to the center (or less) you do not have sufficient gain to receive the small events . If you do this you will not have to inspect the pendulum to see if it is centered. or over on the stops. BY doing a walk up and confirming that both sides of the trace are equal and of the same amplitude will do it all at one time. If you cannot get a full deflection by doing a walk up, increase the gain on the amp until you do. If that does not work, increase the size of the coil and or the magnets until you do NO, i did not notice any difference in the time of the events on the East coast. I do not know the answer to that one. I do know that several times each month i get small events on the Modified Lehman that are never posted by anyone . SO ,your instrument when set up correctly will surprise you. 73 jc W5auh \ ________________________________________________________________ Subj: Re: wondering? Date: 27/02/01 15:31:59 GMT Standard Time From: DSaum@............ (David Saum) > From: "Ed Ianni" > Date: Mon, 26 Feb 2001 08:20:40 -0500 > > I recently completed my Lehman seismograph. I don't know if it is tuned > properly. Yesterday there was a "quake" in Ca. I believe of 4.4 mag. I > live in south NJ and did not detect it. Was it of sufficient Mag. that I > should have picked it up? Thanks, Ed. I am in the same boat, and this is what I have been doing: 1. Take a look at a professional nearby online seismograph. If they don't see anything, then we won't either. Here is one in Palisades, NY: http://www.ldeo.columbia.edu/cgi-bin/LCSN/WebSeis/24hr_heli.pl?id= You can adjust it for "long period" and "EW" or "NS" orientation. My Lehman in VA generally shows most quakes that show up on the LCSN helicorder display, but some are "way down in the mud" on my display. 2. Take a look at the USGS NEIC near realtime list of quakes http://wwwneic.cr.usgs.gov/neis/bulletin/bulletin.html and figure that you might be able to see 5m and above in the US and 6m and above worldwide, at best. Unless the quake is in NJ! 3. Look at the latest PSN Data files and see what your neighbors have recorded. http://psn.quake.net/cgi-dos/event.exe For example, I have tried to adjust my filtering and gain to match the results I see from the PSN site in Herndon, VA ( just up the road from me). You can compare yours to PSN sites in NJ. Hope this helps, Dave __________________________________________________________ Subj: Re: wondering? Date: 27/02/01 18:33:31 GMT Standard Time From: roybar@........ (BOB BARNS) Ed Ianni, David's suggestion of using the Lamont helicorder to compare to your observations is a very good one. However, I think that, rather than trying to adjust your gain to get records which are like Lamont's, it is better to adjust your amp gain to show only a few counts, say 10 or 20, on the quietest days at your location. The dynamic range of quakes is large and this adjustment will give you the maximum range (ever hear of Max Headroom :-) ) when big ones come along. This is the way I operate and one or two per year still exceed the range of a 16 bit A/D. Bob Barns, Berk. Hts., NJ > > From: "Ed Ianni" > > Date: Mon, 26 Feb 2001 08:20:40 -0500 > > > > I recently completed my Lehman seismograph. I don't know if it is > I am in the same boat, and this is what I have been doing: > > 1. Take a look at a professional nearby online seismograph. If they don't > see anything, then we won't either. Here is one in Palisades, NY: > http://www.ldeo.columbia.edu/cgi-bin/LCSN/WebSeis/24hr_heli.pl?id= > You can adjust it for "long period" and "EW" or "NS" orientation. > My Lehman in VA generally shows most quakes that show up on the LCSN > helicorder display, but some are "way down in the mud" on my display. > > 2. Take a look at the USGS NEIC near realtime list of quakes > http://wwwneic.cr.usgs.gov/neis/bulletin/bulletin.html > and figure that you might be able to see 5m and above in the US > and 6m and above worldwide, at best. Unless the quake is in NJ! > > 3. Look at the latest PSN Data files and see what your neighbors > have recorded. > http://psn.quake.net/cgi-dos/event.exe > For example, I have tried to adjust my filtering and gain to match the > results > I see from the PSN site in Herndon, VA ( just up the road from me). You > can compare yours to PSN sites in NJ. > > Hope this helps, > > Dave > __________________________________________________________ Subj: Re: wondering? Date: 28/02/01 00:30:18 GMT Standard Time From: johnjan@........ (The Lahrs) Ed, David's suggestions are good. In addition you could check out this page: http://geohazards.cr.usgs.gov/tt/ and select: "Compute arrival times at Your seismic station for recent earthquakes." You can list the recent earthquakes and see exactly when your station should receive the P wave and also how large the P wave and surface waves should be at your station. Once you record a few earthquakes you will have a good idea how large the waves must be for you to get a clear signal above the noise at your site. Cheers, John At 08:30 AM 2/27/2001 , you wrote: > > From: "Ed Ianni" > > Date: Mon, 26 Feb 2001 08:20:40 -0500 > > > > I recently completed my Lehman seismograph. I don't know if it is tuned > > properly. Yesterday there was a "quake" in Ca. I believe of 4.4 mag. I > > live in south NJ and did not detect it. Was it of sufficient Mag. that I > > should have picked it up? Thanks, Ed. > >I am in the same boat, and this is what I have been doing: > >1. Take a look at a professional nearby online seismograph. If they don't >see anything, then we won't either. Here is one in Palisades, NY: >http://www.ldeo.columbia.edu/cgi-bin/LCSN/WebSeis/24hr_heli.pl?id= >You can adjust it for "long period" and "EW" or "NS" orientation. >My Lehman in VA generally shows most quakes that show up on the LCSN >helicorder display, but some are "way down in the mud" on my display. > >2. Take a look at the USGS NEIC near realtime list of quakes >http://wwwneic.cr.usgs.gov/neis/bulletin/bulletin.html >and figure that you might be able to see 5m and above in the US >and 6m and above worldwide, at best. Unless the quake is in NJ! > >3. Look at the latest PSN Data files and see what your neighbors >have recorded. >http://psn.quake.net/cgi-dos/event.exe >For example, I have tried to adjust my filtering and gain to match the >results >I see from the PSN site in Herndon, VA ( just up the road from me). You >can compare yours to PSN sites in NJ. > >Hope this helps, > >Dave > John C. Lahr 1925 Foothills Road Golden, CO 80402 (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Subj: Record Sections Date: 28/02/01 01:45:25 GMT Standard Time From: dwebb2@.............. (Dick Webb) Hi, Does anyone know of software that could create a record section from data files in the SDR format. Or, programs to convert from SDR into other formats that could then be used with software to make a record section. Dick __________________________________________________________ Subj: Re: Record Sections Date: 28/02/01 02:00:50 GMT Standard Time From: cochrane@.............. (Larry Cochrane) Dick, Arie in Australia has some software that uses the SDR daily record file. See http://members.iinet.net.au/~ajbv/Software/Software.html for more info. -Larry Cochrane Redwood City, PSN _________________________________________________________ Subj: Re: Record Sections Date: 28/02/01 02:22:25 GMT Standard Time From: ian@........... (ian) is there a utility that does the opposite, ascii to sdr format? TIA __________________________________________________________ Subj: Record Section Date: 28/02/01 12:33:03 GMT Standard Time From: dwebb2@.............. (Dick Webb) Hi, I have a funny feeling that I am confusing everyone by calling it a "record section" What I am looking for is a way to stack SDR files so that they are arranged on the same time scale and by distance from the epicenter. An example of this can be found at http://wwwneic.cr.usgs.gov/neis/usnsn/section.html It is also a standard way to graphically display data from geophysical surveys. Dick __________________________________________________________ Subj: Re: Record Section Date: 28/02/01 12:54:43 GMT Standard Time From: angel@............ (Angel Rodriguez) Hello Dick, Wednesday, February 28, 2001, 7:31:02 AM, you wrote: DW> Hi, DW> I have a funny feeling that I am confusing everyone by calling it a "record DW> section" What I am looking for is a way to stack SDR files so that they DW> are arranged on the same time scale and by distance from the DW> epicenter. An example of this can be found at DW> http://wwwneic.cr.usgs.gov/neis/usnsn/section.html It is also a standard DW> way to graphically display data from geophysical surveys. DW> Dick DW> __________________________________________________________ DW> Public Seismic Network Mailing List (PSN-L) DW> To leave this list email PSN-L-REQUEST@.............. with DW> the body of the message (first line only): unsubscribe DW> See http://www.seismicnet.com/maillist.html for more information. Hi Dick, Thanks for the URL for what you are calling a record section. I make things that look like that in a convoluted but effective way and most of it is automated. I do it with a suite of programs called Seisan. It free from the University of Norway. I am still learning how to use it but basically you collect all your files into the Seisan data base and then run a program call "mulplt" You can get the manual and the software at: http://www.ifjf.uib.no/English%20Pages/index.html check out page 59 in the PDF manual I hope this helps. Best regards, Angel mailto:angel@............ __________________________________________________________ Subj: Re: Record Section Date: 28/02/01 15:08:37 GMT Standard Time From: dwebb2@.............. (Dick Webb) Hi, I too downloaded the Seisan package a week or so ago but was rather intimidated. I'll give it another look. One of the problems for me was that Seisan used a specific file format and it wasn't SDR. Thanks for the info. I'll let you know how it goes. Regards, Dick __________________________________________________________ Subj: Request for Sprengnether Manuals Date: 28/02/01 03:55:37 GMT Standard Time From: RWestfall@........... (Westfall, Ron) Hi I have recently been lucky enough to acquire three Sprengnether seismometers. The two horizontals appear to be Series 100 devices and the vertical is a Series 201. I was able to get partial manuals for both types of device, but the horizontal manual is missing at least one page. The partial manuals contain a diagram that I am sure I have seen on a PSN member's web site, but I am not sure where. Does anybody have a full set of manuals for these seismometers? I would be most appreciative if I could get a copy. Thanks, Ron Westfall __________________________________________________________ Subj: WOW! Date: 28/02/01 19:05:41 GMT Standard Time From: tfreyis@........ (Tom Frey) We just got hit in the Pacific Northwest.. I'm in Tacoma and it knocked my sdr off line. It was so strong it was difficult to stand....10:59 PST ot there about More as time goes on tom _________________________________________________________ Subj: Re: WOW! Date: 28/02/01 19:11:52 GMT Standard Time From: JRBBA@....... WOW TOO! Everything saturated - Jim Brown on Tiger Mtn south of Issaquah Uof W Geo dept said aoout 10 mi NW of olympia __________________________________________________________ Subj: Pacific NW Shaker Date: 28/02/01 19:13:10 GMT Standard Time From: DGentry509@....... My home in East Wenatchee, Wa was moving around for 30 seconds. I'm located central in state on the Columbia River. MSG (Ret) D.R. Gentry U.S. Army Security Agency '57-'76 East Wenatchee, WA ________________________________________________________________ Subj: Washington event Date: 28/02/01 19:52:13 GMT Standard Time From: allworth@.............. (Al Allworth) Does anyone have info on the Olympia area event? _______________________________ Al Allworth On the Beautiful Southern Oregon Coast __________________________________________________________ Subj: Re: Washington event Date: 28/02/01 19:56:21 GMT Standard Time From: fmcjunki@........ (Frank McJunkins) > Does anyone have info on the Olympia area event? Other than being inside the garbage dump in South Seattle and watching daylight appear between cracks in the concrete ceiling, no. It was moderately exciting and I think I did a 300' run in about five seconds. On the technical side, no. __________________________________________________________ Subj: Re: Washington event Date: 28/02/01 20:10:02 GMT Standard Time From: canie@........... (Canie Brooks) Just heard CNN reporting 7.0 and 30 miles deep - Seattle fault and near Olympia Canie __________________________________________________________ Subj: Re: Washington event Date: 28/02/01 20:13:16 GMT Standard Time From: dcrice@............ (Doug Crice) There's a little information on the USGS site, but not very many folks have sent in intensity reports yet. http://earthquake.usgs.gov/activity/latest/eq_01_02_28.html Frank McJunkins wrote: > > > Does anyone have info on the Olympia area event? > > Other than being inside the garbage dump in South Seattle and watching > daylight appear between cracks in the concrete ceiling, no. It was > moderately exciting and I think I did a 300' run in about five seconds. On > the technical side, no. > > __________________________________________________________ Subj: RE: Washington event Date: 28/02/01 20:45:26 GMT Standard Time From: whidbeymkj@........ (Mike Johnston) I was on the top (fourth) floor of the INTEL building in DuPont, not very far from the epicenter (4 miles max). Severe shaking, with ceiling tiles and some equipment falling. Heard reports of broken water, etc., but building appeared to weather it well. -Mike Johnston __________________________________________________________ Subj: A very personal observation Date: 28/02/01 22:16:46 GMT Standard Time From: tfreyis@........ (Tom Frey) Greetings Needless to say my day changes this morning. I was sitting at my 'puter looking over a couple of event files saved last night when everything went crazy. The onset of the sound and motion was was followed almost immediately by'lights out'. My first thought was 'sure lose power right when I need it the most, probably the only large quake near me for the next 50 years'. Examination showed some damage to surrounding buildings, but nothing major. Most suprisingly my sensor was laying on its side like some futuristic broken metallic creature. Lights, hanging flowers etc were swinging in wide (2 1/1 to 3 foot) arc's. Then i chuckled when I realized that I would have gotten no real info from it anyway. Saturation must take place somewhere before the large swings that the pendulum must have been taking as it pitched to it's right side. : } tom ___________________________________________________________ Subj: Re: Pacific NW Shaker Date: 28/02/01 22:27:17 GMT Standard Time From: John.Tacinelli@........ (John Tacinelli) I picked it up here in Minnesota on our Wards seismograph. My environmental geology students will be excited to see the seismogram tomorrow. I would love to call someone who actually experienced the earthquake and have them talk to my class. Does anyone have time tomorrow or Friday at about 12 pm Central time? (10 am your time). I will see my A-V people in the AM to see if it can be done. Glad to see it hasn't knocked out the internet. Hope the aftershocks don't get you... John Tacinelli Ph.D. Earth Science Instructor Rochester Community and Technical College 851 30th Ave SE Rochester, MN 55904-4999 (507) 285-7501 __________________________________________________________ Subj: Son's experience Date: 01/03/01 01:42:12 GMT Standard Time From: ted@.......... (Ted Blank) Jason was in his 6th floor dorm room at Univ. of Washington Seattle when the quake occurred. He felt an up and down motion first, which he at first attributed to loud music in the room below. (Those guys must have some speakers). Then a sideways motion set in, he jumped to his feet and said he saw the floor ripple over the next 30 seconds. There was no damage to the dorm, UW remains open. Has anyone seen the video of the collapsed roadway with the tall pine tree laying near it. A great deal of soil under half of the road slipped downhill (half the roadway is gone). However the tree is laying down pointing uphill, which implies to me a rotational movement that layed it down. Rainy areas have lots of these kinds of slips, I think they are called arcuate slope failures. The tree was vivid evidence of the rotational movement. Ted __________________________________________________________ Subj: RE: Washington event Date: 01/03/01 02:23:32 GMT Standard Time From: kareemjupiter@............. (Kareem Lanier, Sir JooJoo) Did anyone record the event on a short period system in SF Bay area? If so, what time did the sensor detect the event? How long did it take the first waves to arrive here in the SF bay area? __________________________________________________________ Subj: Re: Washington event Date: 01/03/01 02:43:19 GMT Standard Time From: cochrane@.............. (Larry Cochrane) The event hit the Niles Canyon USGS telemetry sensor at 10:56:50 local time. The event happened at 10:54:33 so the travel time of the P wave was 2 min 17 sec. The distance between the sensor and the event was 1064 km or 660 miles giving the P wave an average velocity of 7.76 km / sec. The S wave arrived around 10:58:36 so the travel time was 4 min. 3 sec giving an average S velocity of 4.37 km/sec. -Larry Cochrane Redwood City, PSN __________________________________________________________ Subj: Re: Son's experience Date: 01/03/01 02:53:08 GMT Standard Time From: earth@........... (bobshannon.org) > Jason was in his 6th floor dorm room at Univ. of Washington Seattle when > the quake occurred. He felt an up and down motion first, which he at first > attributed to loud music in the room below. (Those guys must have some > speakers). Then a sideways motion set in, he jumped to his feet and said > he saw the floor ripple over the next 30 seconds. There was no damage to > the dorm, UW remains open information. My son Chris is doing his Masters work at the same school, but the Med Department. He was sent home after they closed the medical library. He was on the third floor of the seven story cement building and at a work station. He said he went under the desk but was thinking all along about 4 floors above him....Chris is very intuitive and knew right away what it was...He is also on the emergency group with the Seattle Hospitals....His wife works in Redmond on the 4th floor and also sent me email very quickly. Chris noted the computers at the Med School were still working after the qauke but the outgoing regular phones were not...he went home to Kirkland to find nothing in damage...not even a moved picture on the wall....He did say Seattle TV played it up but he knew that most of the damage was in what he calls Old Town. Old Town and U of W Med are both on landfill! Bob Shannon Pinpoint EQ News __________________________________________________________ Subj: seattle quake Date: 01/03/01 03:25:04 GMT Standard Time From: SW6079@....... I was on an a/c service call in central Seattle when it hit. I think I actually felt the p wave on this one, I remarked to the business owner "did you feel that?" He didn't but certainly felt the surface waves!! The building sustained, I would guess about a foot of rapid vertical jumps, very frightening. I fell on my face, as did several others. Fortunately little damage to my house... As usual, Murphy was at it, and my seis. was off line. Hope all is well w/ the rest of y'all. Mike N7ORL. __________________________________________________________ Subj: RE: Son's experience Date: 01/03/01 03:33:08 GMT Standard Time From: kareemjupiter@............. (Kareem Lanier, Sir JooJoo) Thanks Larry. I'm having a little trouble distinguishing the arrival of the P waves versus the S waves on my sample of a seismogram. My system is a short period sensor (Mark products, L4C geophone). Some quakes leave a pretty good trace allowing one to see the difference between the two wave types but with this reading it's hard to do. Any suggestions? __________________________________________________ Subj: RE: Washington event Date: 01/03/01 04:11:14 GMT Standard Time From: shammon1@............. (steve hammond) Hi Kareen, In Aptos, I recorded the event on my Lehmans and normal background noise on the geophones. Hi Ted & Bob, glad to hear the kids' made it through the event safely- Regards, Steve Hammond PSN Aptos, CA ______________________________________________ Subj: Re: Son's experience Date: 01/03/01 21:34:50 GMT Standard Time From: hernlund@............ (John Hernlund) "Kareem Lanier, Sir JooJoo" wrote: > Thanks Larry. I'm having a little trouble distinguishing the arrival of the > P waves versus the S waves on my sample of a seismogram. My system is a > short period sensor (Mark products, L4C geophone). Some quakes leave a > pretty good trace allowing one to see the difference between the two wave > types but with this reading it's hard to do. Any suggestions? S-waves can be and are usually polarized, similar to light waves. This means that you are only guaranteed good S-wave arrivals if you have three mutually perpendicular sensors. For example, if a quake happens directly to the north of you and your sensor is also pointed north-south, then you will get a great P-arrival but not much S-arrival data. On the other hand, in this scenario if you have your sensor pointed east-west then you will get a better S-wave arrival but not as strong of a P-arrival. John Hernlund Department of Earth and Space Sciences University of California, Los Angeles hernlund@............ __________________________________________________________ Subj: RE: A very personal observation Date: 01/03/01 21:29:34 GMT Standard Time From: shammon1@............. (Steve Hammond) Tom, how are things going today? Did you get your system back together? In reading your post, I was reminded of one of the great stories from the Loma Prieta event, credited to Jan Froom from Gilroy, CA. He has a recording of his system flying off the table just before it hit the floor and the power went out. Regards, Steve Hammond PSN Aptos, CA ___________________________________________________ Subj: Wasssaaaap? Date: 01/03/01 22:31:57 GMT Standard Time From: lconklin@............ (Larry Conklin) In a recent posting, Dave Saum recommended the daily record of seismic activity that is available on the Lamont-Dorherty web site (http://www.ldeo.columbia.edu/cgi-bin/LCSN/WebSeis/24hr_heli.pl) I monitor that site routinely, since the Pasisades station is relatively closse to me (couple of hundred miles). It is extreemly interesting to compare what they are seeing with the output of my sensor. Which leads to a question: This morning, my sensor was running very quiet (for this location at least). In the last couple of hours I have been getting a significant amount of relatively long period signal, around 20-30 second period. On my system, there is invariably a peak in the spectrum of the bacground of about 25 seconds or so. The interesting thing is that over the course of today it has increased by maybe a factor of 3. When I look at the data being taken at Palisades, they too have had a very evident increase in the level of low frequency waves over the past few hours. You have to look at the "long period, 5x" data to see it clearly. Also, it only shows up in the horizontal components. The z-axis doesn't show the lf signal at all. This is the first time I've noticed a correlation between the Palisades data and my data with respect to this kind of signal. Do any of the experts out there know where this energy comes from? I understand that the microseisms are thought to relate to weather activity. Is that an explanation for this lower freq noise as well? Larry Conklin lconklin@............ __________________________________________________________ Subj: Re: A very personal observation Date: 01/03/01 22:37:02 GMT Standard Time From: tfreyis@........ (Tom Frey) Steve (et al) Unfortunately it did some major damage to the entire system. Including breaking the amp/filter board. It will take me awhile to get back to where I was. I do have 2 Geophones (actually 3 I have two in series to see what happens) 10hz but have been able to record a couple of aftershocks one in the 3.2 range at about 1:10 AM PST this morning. : ) tom ________________________________________________________ Subj: who has a PS2 Kinemetrics system? Date: 10/03/01 15:22:50 GMT Standard Time From: kareemjupiter@............. (Kareem Lanier, Sir JooJoo) How do you connect a PS-2 (similar to a PS-1) system to a PC: I have a PS2 Kinemetrics portable system which has all of its components (i.e. geophone, drum, and amp). I would like to connect it to a PC with/without the use of an A/D board; is it possible to do this by perhaps using a serial cable? Kareem Lanier www.HeyJooJoo.com __________________________________________________________ Subj: Varian G-10 Date: 10/03/01 19:49:42 GMT Standard Time From: BCchesire@................ (Brian Chesire) Does anyone have a schematic oaf a varian G-10 pen motor. I have one that I've used of and on for 20 years. It's noisy, clunky and works. I was thinking about solid stating it. I tried to trace it and draw my own schematic but it's packed so tightly, I have given up after several tries. Thanks Brian __________________________________________________________ Subj: Re: Varian G-10 Date: 10/03/01 20:45:02 GMT Standard Time From: dcollin@........... (D Collins) At 12:49 PM 3/10/01 , you wrote: >Does anyone have a schematic oaf a varian G-10 pen motor. I have one >that I've used of and on for 20 years. It's noisy, clunky and works. I >was thinking about solid stating it. I tried to trace it and draw my own >schematic but it's packed so tightly, I have given up after several >tries. >Thanks >Brian I have the book on the G-11 ... very similar to the G-10. Darrell _________________________________________________________ Subj: Re: ward's seismograph Date: 10/03/01 20:45:27 GMT Standard Time From: cochrane@.............. (Larry Cochrane) John Tacinelli wrote: >Is it possible for the SDR, Emon and Winquake programs to be modified to either record data from >the serial interface or convert the files I get to a readable format? I don't know too much about the >SDR, Emon or Winquake programs since I can't currently use them. WinQuake only views and analyses event files, it does not do any datalogging. SDR was written around my A/D card (and a PCLabs 711 A/D card) and requires a 1 millisecond interrupt from the A/D card to do it's internal timing. It could not be modified to use a serial interface. Not sure about EMON..... -Larry Cochrane Redwood City, PSN __________________________________________________________ Subj: RE: Recording Pen Date: 10/03/01 23:27:20 GMT Standard Time From: shammon1@............. (steve hammond) A hypodermic needle works great. Grind the point off, heat and bend, use copper tubing and solder to build up to a size that matches your current ink supply tube. BTW, Howard and Woody, 1940's amateur seismologist, used this method to build the pins for their chart recorders and showed a few of us PSN guys about 50 years later. Using .005-.010'' copper sheet, they built a frame to support the hypodermic needle (let's say on the left of the pivot point, mounted the pivot point to the right of center, and on the right side mounted a screw shaft with a counter weight. This would allow them to adjust the pin pressure by moving the counter weight in and out. Cool design and it works well. Regards, Steve Hammond PSN Aptos, CA _________________________________________________ Subj: Re: SEISMOMETERS ON EBAY Date: 11/03/01 01:12:58 GMT Standard Time From: RADIOTEL@....... Two Kinemetric SH-1 seismometers were just placed on EBay by a company called Machine Dynamics, Inc. Several PSN members purchased units from them about two months ago through EBay including me. I purchased a Kinemetrics SV-1 which arrived in great shape and is working great. The family that owns the business were a pleasure to do business with. _______________________________________________________ Subj: Re: Kinemetrics SH-1 Seismometers Date: 11/03/01 01:49:40 GMT Standard Time From: mlamb1@.......... (meredith lamb) The E-Bay item numbers/web addresses for the seismometers are below: We have recently added two SH-1 seismometers to our ebay listings at the following addresses: Good luck bidding! Roman WowkMACHINE DYNAMICS, Inc. www.machinedyn.com 3540-B Pan American Frwy. NE PO Box 66479 Albuquerque, NM 87193-6479 505.898.2094 _________________________________________________ Subj: Kinemetrics SH-1 seismo Date: 11/03/01 02:16:54 GMT Standard Time From: mlamb1@.......... (meredith lamb) Hi all, >From looking at the E-Bay pictures, its a inverted mass alright. I suppose in many ways kind of like the old "Wiechert" from the turn of the century design. Am guessing because of the balance (spring?), their is alot more actual mass movement than in a S-G design. I'd hope it is pretty stable in design. Don't know....I see fairly good results only with the S-G hanging pendulum amateur design...but one needs a very sensitive pickup via capacitance or a Hall sensor to do the job. With the S-G, their isn't much possible mechanical fault drift....outside of ground tilt causes, as with all seismos of course. All interesting of course... Regards, Meredith Lamb __________________________________________________________ Subj: Re: Kinemetrics SH-1 Seismometers Date: 11/03/01 02:33:06 GMT Standard Time From: mlamb1@.......... (meredith lamb) morris wrote: where are you finding these on E-bay? Ron Ron, I actually wrote a email to the seller of the previous seismos back in ~ January, and he complied with a email notice of the item # and address. E-Bay is kind of tricky sometimes....one should say do the search (whenever), by using more specific seismo/company word specifics. I.E., this seismo could be probably found by typing: Kinemeterics seismometer. Their is a whole host of other companys that could show up requiring specifics.... Teledyne, Sprengnether etc., I suppose. Even that seismo subject of afew days back had....what....Ward Instruments or some thing like that. Tricky to find....unless the seller just lists it as "seismometer".....(which it often isn't), it could be "art", or a manual too. E-Bay has a new and old search engine...sometimes it pays to use both....for any subject. BTW.....if one uses the search on E-Bay for "aluminum plates", you'll find alot of possible good seismometer bases. There is currently alot of them with a round circumference....ideal for the S-G version. Some are really thick (1.250") and thats perhaps the best for stability....although one has to come up with a design and do the metal working involved. I think most of them only have one bidder, if at all, and their is alot of repeats toward selling the same shape by a company out in California, in the sense of disposal of excess. Regards, Meredith Lamb ______________________________________________ Subj: Re: Varian G-10 Date: 11/03/01 03:48:45 GMT Standard Time From: BCchesire@................ (Brian Chesire) Darrell I would be more than happy to pay for a copy of the schematic and any other pertinent data. Thanks Brian __________________________________________________________ Subj: Re: Recording Pen Date: 11/03/01 13:28:58 GMT Standard Time From: edwianni@........ (Ed Ianni) Hi Steve....I have no supply tube, mine is a portable square that fits inside a holder with a small felt dripping pen to record. I have tried regular pens taped to the holder but they do not work because not enough downward pressure is applied to them (this pressure would be to much for the "holder". Thanx.Ed _____________________________________________________ Subj: Re: Recording Pen Date: 11/03/01 14:23:49 GMT Standard Time From: bobsmith5@........ (Robert L. Smith) Gentlemen -- Consider using plotting pens from pen type plotters. Generally available from artist's and engineer's supply stores or as consumable items from your favorite plotter company. They geneerally require no more pressure that simple contact with paper. Good luck, Bob Smith ____________________________________________________ Subj: Re: ward's seismograph Date: 11/03/01 15:05:12 GMT Standard Time From: ted@.......... (Ted Blank) EMON does not support serial interfaces, although I've tried and failed to add that support in the past. Too many unknowns out there in the serial world... however EMON does support an interface to an assembler module which you write to do the data collection, then EMON calls you to get the next sample. Let me know if you need additional info. Regards, Ted Blank IBM Global Services - Performance Management and Capacity Planning at the Washington Systems Center Office: 238 Highland St., Portsmouth, NH 03801 Tieline: 8-253-9969 Outside: (603) 433-9201 Office Fax: (603) 433-9190 Pager: 1-800-759-8888 PIN 1151100 Notes: Ted Blank/Portsmouth/IBM@IBMUS Internet: ted@.......... "Larry Cochrane" @.............. on 03/10/2001 03:45:06 PM Please respond to psn-l@.............. Sent by: psn-l-request@.............. To: cc: Subject: Re: ward's seismograph John Tacinelli wrote: >Is it possible for the SDR, Emon and Winquake programs to be modified to either record data from >the serial interface or convert the files I get to a readable format? I don't know too much about the >SDR, Emon or Winquake programs since I can't currently use them. WinQuake only views and analyses event files, it does not do any datalogging. SDR was written around my A/D card (and a PCLabs 711 A/D card) and requires a 1 millisecond interrupt from the A/D card to do it's internal timing. It could not be modified to use a serial interface. Not sure about EMON..... -Larry Cochrane Redwood City, PSN __________________________________________________________ Subject: Re: Recording Pen From: ChrisAtUpw@....... Date: Sun, 11 Mar 2001 11:25:12 EST I had a problem with recording pens working at slow speed. I repeatedly got flooded chartpaper with fountain pens and thick felt tip pens. The really fine glass tip drawing pens seemmed better, but didn't last too long. Standard ball pens require quite a high pressure to write - more than my penholder could provide. However, roller ball refills seemed to work OK with minimal pressure and didnt't flood. It could be worth trying if you can mount them OK. Regards, Chris Chapman ___________________________________________________________ Subj: Re: Recording Pen Date: 12/03/01 02:05:16 GMT Standard Time From: gjharris@............. (George Harris) Ed, My R50 recorder has the same type of pen. I made a small rectangular plastic piece with a hole in it. Into this inserted the front end of a porous pen tip. The paper has to be not too porous, or the ink bleeds too far. I suggest the Paper Mate Ultra Fine Flair. In my recorder, the pen can stick out of the top and I assume your is similar. George Harris _________________________________________________ Subj: Re: ward's seismograph Date: 12/03/01 05:06:38 GMT Standard Time From: randallpratts@.......... (Randall Pratt) John, I use EMON to read a serial AD converter but I am reading through the parallel printer port and not the serial port. I wrote the collection module and linked it to EMON with encouragement and support from Ted Blank. You will need information on how the chip is triggered to transmit so the data can be sequenced bit by bit into the program when called for and the format of the data returned so the bytes can be reconstructed. EMON will add all the header info for compatibility with WinQuake. Randy Pratt ----- Original Message ----- From: John Tacinelli To: ; Sent: Friday, March 09, 2001 10:42 AM Subject: ward's seismograph I was just wondering something. Here at RCTC we have one of the seismographs produced by Ward's Nat'l Sci. The electronics are pretty similar to most of the ones you guys run. The only big difference is that it uses a serial box interface instead of an A/D board. The software is okay, but not great. Its a program called EQuake which has just been updated to be windows compatible. I would like to use the software that everyone else uses since then we could exchange files. Is it possible for the SDR, Emon and Winquake programs to be modified to either record data from the serial interface or convert the files I get to a readable format? I don't know too much about the SDR, Emon or Winquake programs since I can't currently use them. John Tacinelli Ph.D. Earth Science Instructor Rochester Community and Technical College 851 30th Ave SE Rochester, MN 55904-4999 (507) 285-7501 __________________________________________________________ Subj: Re: ward's seismograph Date: 12/03/01 13:43:57 GMT Standard Time From: DSaum@............ (David Saum) If the Ward's box has serial output then you should try data logging with Amaseis. It works with serial data formatted ASCII, 9600bps and N80. Each record must be terminated by LF and CR characters. You can download the Amaseis freeware from http://www.geol.binghamton.edu/faculty/jones/as1.html Amaseis can generate event files that WinQuake can read. Alan Jones, the author, is very helpful, and he has also added an interface to the DataQ data logger available from Radio Shack. Ciao, Dave The Cheap Seismometer Project http://www.infiltec.com/seismo/ ___________________________________________________ Subj: SDR ctrl D in W98SE Date: 12/03/01 23:31:38 GMT Standard Time From: angel@............ (Angel Rodriguez) Hello Larry, I just upgraded my SDR machine to W98SE, not sure I'm all that happy with the upgrade but now when I do a Ctrl D it kicks me right back to SDR. I have 32meg of ram. There is no memmaker to be found. Another question, can I run other TSR progams while SDR is running? Best regards, Angel mailto:angel@............ __________________________________________________________ Subj: Re: Varian G-10 Date: 13/03/01 20:50:46 GMT Standard Time From: other@............... (Mark Robinson) I've never seen a Varian G-10 pen motor, however I have played a fair bit with General Scanning's galvanometer scanners and pen motors. I suspect that they may be the same thing. The general scanning G10 is a torsion bar galvanometer scanner with an integral capacitive sensor and associated electronics. If I recall correctly, General Scanning (who seem to have changed their name to GSI Lumonics), will repair their scanners free of charge if they have not been too badly abused. http://www.gsilumonics.com/ They also used to make a pen motor a while ago... it had no feedback, and thus no internal electronics, but still gave very repeatable results at a speed that would be entirely suitable for most seismic applications. Stuffed if I can remember the model number. Sadly none of this stuff is cheap. Mark Brian Chesire wrote: > > Does anyone have a schematic oaf a varian G-10 pen motor. I have one > that I've used of and on for 20 years. It's noisy, clunky and works. I > was thinking about solid stating it. I tried to trace it and draw my own > schematic but it's packed so tightly, I have given up after several > tries. > Thanks > Brian > __________________________________________________________ Subj: Re: PDAS-100 Geotech Date: 14/03/01 01:09:53 GMT Standard Time From: roybar@........ (BOB BARNS) Ray, I don't know what a PDAS-100 is but I recently bought a manual ($35) for a Geotech SL-220 seismometer from Teledyne Geotech. Phone 214-221-0000. They were very pleasant to deal with. Bob Barns Ramon R Machuca wrote: > > Howdy, > Can anybody help me find a user manual for a PDAS-100 > cheers > Ray Machuca > __________________________________________________________ Subj: soldering ADXL chips Date: 14/03/01 17:24:28 GMT Standard Time From: DSaum@............ (David Saum) Here is an interesting web page on soldering surface mount parts like ADXL accelerometers in a toaster oven! http://www.seattlerobotics.org/encoder/200006/oven_art.htm Ciao, Dave __________________________________________________________ Subject: Re: soldering ADXL chips From: ChrisAtUpw@....... Date: Wed, 14 Mar 2001 21:06:07 EST In a message dated 14/03/2001, DSaum@............ writes: > Here is an interesting web page on soldering surface mount parts like ADXL > accelerometers in a toaster oven! > > http://www.seattlerobotics.org/encoder/200006/oven_art.html I prefer to be a LOT kinder to my IC's. I wouldn't dream of cooking them like this. You can buy resin + solder powder in an organic solvent paste. This can be spotted on the solder pads with a wire or a fine brush. Align the IC accurately with the pads and solder using a fine tipped iron. It is easier to do this under a large illuminating magnifying glass. Regards, Chris Chapman _________________________________________________________ Subj: Re: soldering ADXL chips Date: 15/03/01 12:26:58 GMT Standard Time From: jmhannon@........ (Jim Hannon) Infrared and vapor phase soldering are standard industrial practices. The major risk for an amateur using this method is moisture absorption of the plastic IC packages. Great care is taken to make sure that the ICs are kept in a dry enviroment until just before they are soldered. If not, the absorbed moisture can cause the package to crack or explode when exposed the heat of this soldering method. Another problem is that with hand placment of the parts in the solder paste it is far to easy to make a mess of things before the parts are soldered. At work we only use the infrared soldering on the production line where the componenets are place on the boards with machines. Small builds are still hand done with a microscope and soldering iron. A very fine tip on the iron and small diameter solder works quite well. Jim Hannon http://soli.inav.net/~jmhannon/ 42,11.90N,91,39.26W WB0TXL __________________________________________________________ Subj: Re: soldering ADXL chips Date: 15/03/01 18:30:32 GMT Standard Time From: ChrisAtUpw In a message dated 15/03/2001, DSaum@............ writes: Where do I get the paste you refer to? Digikey? Thanks, Dave I live on the far side of the pond. Multicore Solders sell 'Solder Cream' in syringes. Electrolube also sell 'Surface Mount solder paste' both in syringes and in tubs. I think that Enthoven Solders also sell it. The water based pastes that I have used had very corrosive fluxes which were NOT suitable for electronic applications. You can also flatten the fine multicore solder wire, either with rollers or with a hammer, or use it 'as supplied'. Using a soldering iron with a really clean fine tip is half the battle. Using either a magnifying headband or a large magnifying glass is also very helpful. Hope that this helps. Regards, Chris Chapman _________________________________________________________________ Subj: Re: 3/16/01 00:06(U) Event Date: 16/03/01 02:42:09 GMT Standard Time From: peaches@............ (Donna Whitaker) Its on the RedPuma list, which is the first EQ list to check after an event as they usually post within minutes. It is an auto-generated list and the magnitudes are usually wrong, but the locations are fairly accurate. So its good to quickly locate a quake but I always wait for NEIC to post the final info for the quake headder. http://seismo.ethz.ch/redpuma/redpuma_ami_list.html 16Mar2001 00:01:21.0 14.0N 89.0W 33 mb=6.0 A*YKA GUATEMALA Tony __________________________________________________ Subj: Re: 3/16/01 00:06(U) Event Date: 16/03/01 14:47:34 GMT Standard Time From: roybar@........ (BOB BARNS) Steve, I don't know the delay from event to report by Red Puma. You can look at actual seismograms from many seismographs around the world at: http://aslwww.cr.usgs.gov/Seismic_Data/heli2.shtml Another site (near NYC) which allows choosing type of seismograph, etc. is: http://www.ldeo.columbia.edu/cgi-bin/LCSN/WebSeis/24hr_heli.pl These are updated about every 15 mins. so the delay between event and what you see is less than 15 mins. Bob Barns steve jones wrote: > > I just picked up a small event starting at approx. 00:06:03 (U) 3/16/01 > here in > Huntsville, Alabama...does anybody else show something around this > time? USGS does not have it yet, apparently. > > Steve Jones > > Shop online without a credit card > http://www.rocketcash.com > RocketCash, a NetZero subsidiary > ______________________________________ Subj: Re: EMON7 Date: 18/03/01 22:24:23 GMT Standard Time From: RADIOTEL@....... Ted Blank or Other List Members I have been using EMON7 with a Computer Boards A/D and both work flawlessly. However, I just set up another sensor with a BSOFT ANA201-(C) A/D and no matter how I try I can not get it to work right. Could Ted or someone that have a BSOFT ANA-201(C) A/D tell me what settings I should use in the options file, ie: 1. ADC MAX VOLT VALUE 2. ADC VALUE AT ZERO 3. ADC MIN VOLT VALUE I am currently using the Board without the amplification feature on the board and its set as follows: 1. Channel: 1 2. ADC MAX VOLT VALUE: 4095 3. ADC VALUE AT ZERO: 2047 4. ADC MIN VOLT VALUE: -4095 5. A/D BOARD DESIGNATION: 10 By the Way the BSOFT ANA-201(C) is their A/D with the optional amplification up to X100. Any help would be appreciated. Jim Allen Cerritos, Calif. ______________________________________________________________ Subj: Re: Lost Programs Date: 18/03/01 22:41:57 GMT Standard Time From: cochrane@.............. (Larry Cochrane) Bob, The programs you are talking about are SeisVole and Seismic Waves by Alan Jones. You can download the programs from his site here: http://www.geol.binghamton.edu/faculty/jones/jones.html. Both are excellent programs. Regards, Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Robert L. Hancock" To: "PSN" Sent: Sunday, March 18, 2001 2:31 PM Subject: Lost Programs > I had a recent hard drive failure and unfortunatly did not have > everything backed up. I had downloaded two programs from the web and > have lost the source code and links for them. > > One program was a composite of the world and all the earthquakes and > volcanos that had erupted since about 1960. It allowed you to click on > an area and just explore that area alone. You could set the minimum > level of intensity for the earthquakes and the rate the data was > displayed on the screen. > > The second program took five or six earthquakes and showed how the waves > bounced off the core and back to the surface. At the same time, it > displayed the readout of selected seismographs. > > I have lost the link to both of these programs. If anyone is familiar > with them and can supply the links it would be sincerely appreciated. > > Thanks, > > Bob Hancock > > __________________________________________________________ Subj: New SDR beta release and STA/LTA utility Date: 19/03/01 07:49:48 GMT Standard Time From: cochrane@.............. (Larry Cochrane) Greetings, I released a new SDR beta version today. The version number is 3.3 and it can be downloaded here: http://www.seismicnet.com/sdrdocs/sdr.htm. This page also has updated information on the new release. This release should fix a bug in the STA/LTA (Short Term Average / Long Term Average) triggering code. A few days ago I missed a M3.0 in San Jose 51 km from me. Given the size and location my system should have triggered on the event. I tried to repeat the problem using a signal generator but was unable to duplicate it. I made a few modifications to the code and today my system triggered on a Md2.2 event 44 km from me. So it looks like the problem has been fixed. Too help debug the STA/LTA triggering problem I created a simple 32-bit command line program that reads in a PSN Type 4 event file and generates a set of STA/LTA ratios based on STA and LTA times supplied by the user. The time the ratio is calculated and the ratio number are saved in a file called StaLta.txt. Using this program the user can experiment with different event files and STA / LTA average times. Included in the STALTA.ZIP file is the "C' code used to create the program.This code can be used as an example on how to read a PSN Type 4 event file. STALTA.ZIP can be downloaded here: ftp://ftp.seismicnet.com/software/stalta.zip The functionality of the STA/LTA test program has been incorporated in the next release of WinQuake. I hope to release the next version of WinQuake tomorrow. -Larry Cochrane Redwood City, PSN __________________________________________________________ Subj: Sand Tracing Pendulum Date: 19/03/01 15:47:30 GMT Standard Time From: Froom@............. (Jan Froom) I hope I'm not duplicating something that has already appeared here. None the less.... The 6.8 Washington earthquake of 2/28/2001 produced an interesting pattern on the sand tracing pendulum, located at a shop in Port Townsend http://www.gaelwolf.com/pendulum.html Jan __________________________________________________________ Subj: Re: Sand Tracing Pendulum Date: 20/03/01 13:40:32 GMT Standard Time From: DSaum@............ (David Saum) > From: Jan Froom > Date: Mon, 19 Mar 2001 07:47:10 +0000 > The 6.8 Washington earthquake of 2/28/2001 produced an interesting > pattern on the sand tracing pendulum, located at a shop in Port Townsend > > http://www.gaelwolf.com/pendulum.html The description on this web page says ---- "The sand preserves two features of the earthquake waves quite nicely. The "flower" in the center records the surface movements associated with the higher frequency waves that arrived first. The outer larger amplitude oscillations record the lower frequency waves that arrived later. I suspect that the axis of these oscillations was almost north-south (ie directed towards the epicenter)." --- However the "flower" appears to overwrite the outer tracing, indicating that it arrived later, not earlier. Or am I missing something? Dave __________________________________________________________ Subj: surplus equip. Date: 20/03/01 18:20:03 GMT Standard Time From: roybar@........ (BOB BARNS) Hi gang, I happend across: www-lo.ksc.nasa.gov This is a web site of Kennedy Space Center and if you click on "KSC Idle Property Screening List" you get a large list of surplus equipment. This stuff is apparently avail. only to government and educational users. It might be of interest to the educators on this list. Bob __________________________________________________________ Subj: SSA Meeting in April Date: 20/03/01 23:59:06 GMT Standard Time From: dwebb2@.............. (Dick Webb) Hi, I will be attending the SSA meeting in San Francisco, April 17-21, and was wondering if a PSN get together is planned. Best regards, Dick Webb Webb Seismological Observatory (a modest conceit) Raleigh, NC __________________________________________________________ Subj: PSN meeting around:the SSA Meeting in April Date: 21/03/01 01:32:27 GMT Standard Time From: cochrane@.............. (Larry Cochrane) Good question Dick. There was some talk about getting together around the SSA meeting time here in San Francisco. Anyone else interested? -Larry Cochrane _______________________________________________________ Subj: Re: Sand Tracing Pendulum Date: 21/03/01 05:10:21 GMT Standard Time From: ravakian@............ (Robert W. Avakian) I'd like to suggest the following sequence to explain the paterns. 1 P wave arrives and starts the pendulum swinging in a straight line 2. S wave arrives and ads a horizontal component of differrent ampliture at 90 degrees to the P wave motion. Motions combine to turn motion into the ovals seen. l 3. Pendulum is damped by the sand and is almost at rest wehn. . . Surface waves arrive and create the low amplitude rosette in the center. The pendulumlum recorded only the horizontal components of all three waves due to its design. How does this play to everyone else? Bob Avakian David Saum wrote: > > From: Jan Froom > > Date: Mon, 19 Mar 2001 07:47:10 +0000 > > > The 6.8 Washington earthquake of 2/28/2001 produced an interesting > > pattern on the sand tracing pendulum, located at a shop in Port Townsend > > > > http://www.gaelwolf.com/pendulum.html > > The description on this web page says > > ---- > "The sand preserves two features of the earthquake waves quite nicely. The > "flower" in the center records the surface movements associated with the > higher frequency waves that arrived first. The outer larger amplitude > oscillations record the lower frequency waves that arrived later. I suspect > that the axis of these oscillations was almost north-south (ie directed > towards the epicenter)." > --- > > However the "flower" appears to overwrite the > outer tracing, indicating that it arrived later, not > earlier. Or am I missing something? > > Dave > > __________________________________________________________ Subj: New WinQuake Date: 21/03/01 06:01:16 GMT Standard Time From: cochrane@.............. (Larry Cochrane) Greetings, I have a new WinQuake beta release available on my site for people to try out. You can download it for here: http://www.seismicnet.com/software.html. The release version number is 2.7.5. Here's what's new in this version; In the Map Location window you can now create an event report. To do this , the user places the cursor at the latitude and longitude of the event and then clicks the right button and selects the Make Event Report menu item. WinQuake will average the time of origin and magnitude of each of the event windows used to locate the event and use them for the event report. The event report can then be used to update the header information of each of the event files. The user can now open one of the dialog boxes used to modify or add header information by clicking on the text part of the event window. If you click near the Start Time: label and data the Time Information dialog box will be opened. If you click on the Station: label or data the Sensor Information dialog box will open and if you click below these two lines the Event Information dialog box will be opened. The SDR Replay dialog box now lets you select more then one channel to replay. For this to work correctly you must either select the SDR 2.x Mode or run SDR version 3.3b or higher. This is the SDR version I release a few days ago. The Event Window will now display the Y scale in sensor units (for a lack of a better term) or A/D counts if the sensor sensitivity is known. Before the Y scale was always in A/D counts. You can switch between the two by going to the Y-Scale dialog box. The Event Report dialog box has been changed a little. I added a Historical button. When selected, the Network Event Report dialog box will list only the historical database addresses. I would like some feedback on the response time of my server, so please try it out. Right now WQ and the database server use an inefficient method of sending the data to WQ. If needed, I can speed things up a little. For the testing, only use the PSN Historical servers. To help setup the STA/LTA trigger parameters in SDR, WQ will display the STA/LAT ratios of an event file. To use this feature go to the Calculate / STA/LTA Ratio menu items. This will open up a new dialog box. There enter the STA and LTA times in seconds (fractions of seconds are ok), enter an optional filter number and select Calculate. If the filter isn't too high you should get a list of ratios and the time it was calculated. The information in the list box can be saved to a file by selecting the Save File button. This dialog box is a modeless dialog box meaning that the user can do other things while this dialog box is open. This allows the user to move to different location in the event window and still have the STA/LTA box open as a reference. This version will read in the old PSN text format created by older versions of WQ. I fixed a bug around how WQ save P and S picks in the old format. An error message would always show up when trying to save pick information. That's it. -Larry Cochrane Redwood City, PSN __________________________________________________________ Subj: El Salvador Earthquake report Date: 22/03/01 03:45:08 GMT Standard Time From: angel@............ (Angel Rodriguez) Hello Larry, Ian asked for a URL for the El Salvador earthquake report. I don't know how to place a file so that it has it's own URL. So I have made an FTP for the file. I think it is at: ftp www.volcanbaru.com user = salvador password = salvador there is only one file and it is called salvador.pdf It is a very easy and informative read good pictures too. Best regards, Angel __________________________________________________________ Subj: Re: New WinQuake Date: 23/03/01 03:41:44 GMT Standard Time From: cochrane@.............. (Larry Cochrane) Travis, I just check and my ftp server seems to be working. I can see from the log files other people are downloading it without any problems. You can also download WinQuake here: If you still are having problems I can send it to you as an attachment. -Larry Cochrane Redwood City, PSN ----- Original Message ----- . From: Travis Farmer To: psn-l@.............. Sent: Thursday, March 22, 2001 7:07 PM Subject: Re: New WinQuake when i try to download the file at i get an error (access denied) after about 40 - 45%. this happens each time i try it (about 5 times so far). anybody else have the same problem? -Travis _____________________________________________________________ Subj: Fw: April visit to Calif. - PSN Meeting Date: 23/03/01 05:24:03 GMT Standard Time From: cochrane@.............. (Larry Cochrane) All, I got this from Jim Lehman today. The original Scientific American article (http://www.seismicnet.com/lehmntxt.html) describes Jim's sensor. Hopefully we can get something together. I for one would like to meet him in person. I'll be happy to organize the event if enough people are interested in coming. -Larry Cochrane Redwood City, PSN > Larry--I plan to be around San Francisco Wed. April 18th > to Sunday the 22nd. I will attend some of the SSA > meeting and the Sat. field trip. > Let me know should there be a gathering of PSN folk > during that time frame. > Thanks-- Jim Lehman __________________________________________________________ Subj: Question Date: 24/03/01 06:03:57 GMT Standard Time From: travis5765@........... (Travis Farmer) I have wrapped my own coil and was wondering if there was a way to test the performance before building the rest of the equipment. Here are the specs: Dimensions core Diameter - 1 1/8" coil diameter - 1 5/8" coil width - 5/8" I wrapped it (fairly loose) using transformer wire (about a hair thick. not sure of gage). it has a DC resistance of 138 Ohms. I have not yet selected a magnet (all I have is old speaker magnets). does this coil sound useable? -Travis _________________________________________________________________ Subj: big quake Date: 24/03/01 07:11:22 GMT Standard Time From: ajbv@............ (Arie Verveer) Just received a rather large P and distant S wave. Their appears to be a big quake (north) of my location in Western Australia. Maybe? arie __________________________________________________________ Subj: Re: big quake Date: 24/03/01 08:16:30 GMT Standard Time From: info@........ (IESN) Hi Arie EMSC Agency report: 06:27:51.8 34.1N 132.5E 33G Mb6.5 A NEIA WESTERN HONSHU, JAPAN A short increase of amplitude on my e/o long period. Francesco Italy __________________________________________________________ Subj: Seismometer For Sale Date: 24/03/01 18:10:02 GMT Standard Time From: LBOSKY@....... i have a Teledyne Geotech Helicorder 2484 (It has an extra galvanometer for 2 channel operation and instruction book), a Geotech transistor preamplifier, Hybrid IC Driver, Power supplies and detectors for sale. The long period detector is a home made garden gate long period (4 sec) type and i have a vertical detector made by Texas Inst. (S-36U) made for bore hole placement. It has a natural frequency of 2 Hz. The system includes a HP 5150A Timing unit for putting tick marks on the recording. It uses a heat pen and burns old roll Fax paper, You need to have a little bit of electronics experience to set up and operate a system like this. Price $750... It has been in continuous operation here in Colorado Springs for 12 years. If you would like to see a record of the Olympia WA, earthquake, send me an email and i'll send you a picture of the seismograph recording. LBOsky@....... Paul Signorelli PO Box 6069 Colorado Springs CO 80934 __________________________________________________________ Subj: Re: DIGITAL FILTER Date: 25/03/01 12:26:53 GMT Daylight Time From: cochrane@.............. (Larry Cochrane) Francesco, I used a book called "Analog and Digital Filter Design Using C" by Les Thede to add time domain digital filtering to WinQuake. You can order the book on Amazon.com. The C code used in the book can be downloaded from the authors web site here: http://www.onu.edu/user/FS/lthede/ -Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "IESN" To: Sent: Saturday, March 24, 2001 12:26 AM Subject: DIGITAL FILTER > Hi to all. > Anybody can help me to found on net a source code for digital filters to > apply in a seismological software? > Cheer > Francesco Italy __________________________________________________________ Subj: Earth Quake Books For Sale Date: 25/03/01 17:41:38 GMT Daylight Time From: LBOSKY@....... Used Seismology Books For Sale - Rev. C (hb = hard back, pb = paper back) ----------- 5. Earth Quakes, pb, Bruce Bolt, Revised ed. 1988 $10 6. Geology, TM 5-545, Army Technical Manual. 1971, pb $5 7. Handbook of Geophysics, USAF, hb, (water damaged :<) $5 8. Handbook of Geophysics and Space Enviro, USAF Cambridge Res. Lab., hb, $10 11. The Encyclopedia of Geomorphology, Fairbridge, hb, $10 12. Plate Tectonics and Geomagnetic Reversals, A. Cox, pb, $10 14. GSA Bulletin, June 72, (San Fernando Earthquake), pb $5 15. Continents Adrift, Readings from Scientific American, pb, $5 16. Earth, Press/Siever, Freeman Press, hb, $10 17. Pole Shift, J. White, pb, $5 18. Outlines of Geology, J.L. Comstock, hb, 3rd Ed, 1840, $100 19. Volcanos, Decker & Decker, pb $5 20. Elementary Seismology, C.F. Richter, hb 1958 $30 21. Earthquake!, Eloise Engle, hb $5 22. On Shaky Ground, John J. Nance, hb $5 23. Inventory of Filmed Seismograms, National Geophysical Data Center, Report No. SE-37, pb, 1985, $1 24. Summary of Earthquake Data Base, No 21, 1985, pb $1 25. The San Fernando Earthquake Feb 9, 1971, Geological Professional Paper 723 pb, 254 pages, $25 26. Responses to Iben Browning's Prediction of a 1990 New Madrid, Missouri, Earthquake, USGS Circular 1083, 1993, pb, 248p., $10 27. Earthquake Information Bulletin, USGS, pb, 1972-93, 96 issues, $100 29. Lessons Learned from the Loma Prieta, CA, Earthquake Oct. 17, USGS Circular 1045,1989, pb, 50p, $5 30. Peace of Mind in Earthquake Country, Peter Yanev, pb, 218p $5 32. Planet Earth, Earthquake, Bryce Walker, hb, Time-Life), $5 33. Manual of Seismological Observatory Practice, NOAA Report SE-20, P. Willmore, 1979, pb, $10 34. Earthquake Country, Robert ICAO, (Sunset Book), pb, $5 35. California 71' Earthquake, JRK Pubs, pb, $5 36. Earthquakes and Volcanoes, Bruce Bolt, (Scientific American), pb, $10 37. The Alaska Earthquake Mar. 27, 1964, USGS Prof. Paper 541, hb, $10 38. The Agadir, Morocco Earthquake, Feb. 29, 1960, AISI, hb, $5 39. Earthquake Prediction from Laser Surveying, NASA SP-5042, 1968, pb, $1 40. A Study of Earthquake Losses in the LA Area,1973, NOAA, pb, 331p, $5 41. San Fernando Earthquake of Feb. 9, 1971, NOAA, Vol. 1, Parts A&B, hb, $25 42. Abatement of Seismic Hazards to Lifelines: Proceedings of a Workshop 1986 (pb), 6 vols, FEMA, Series 26: (over 900 pages total) - $10 for all. Vol. 1 Papers on Water and Sewer Lines (FEMA 135) Vol. 2 Papers on Transportation (FEMA 136) Vol. 3 Papers on Communications (FEMA 137) Vol. 4 Papers on Power Lifelines (FEMA 138) Vol. 5 Papers on Gas and Liquid Fuel Lifelines (FEMA 139) Vol. 6 Papers on Political, Economic, Social, Legal and Regulatory Issues (FEMA 143) Shipping is extra...usually about $1.50 per book. Feel free to pass this list on to others. Send me an email to see other book lists on Physics/Engineering, Geology and Astronomy. Paul Signorelli LBOsky@....... PO Box 6069, Colorado Springs, CO 80934 ps: The Seismometer has been sold. _________________________________________________________ Subj:Galvanometer Period Date:26/03/01 00:09:00 GMT Daylight Time From: SFQUAKE06@........... (Office of Emperor Norton, Bummer and Lazarus) Hello Everyone: Simple question: I believe that the WWSN had two sets of seismic instruments. One set to record short period waves and the other set to record long period waves. The long period instrument was a springnether with a 15 second pendulum and a 90 second galvanometer. Can anyone tell me how one goes about making a 90 second galvanometer? The restoring force on the coil must be extremely small! How did they do that? Thanks for any reply Dave Close ___________________________________________________________ Subj: Re: Galvanometer Period Date: 26/03/01 15:47:48 GMT Daylight Time From: roybar@........ (BOB BARNS) Dave, I believe that those long period galvanometers were of the type where the coil hangs at the end of a rather long torsion wire. By making the wire long (say 4") and fine, the restoring force can be made small. The suspension wire was one connection to the coil and the other connection was a spiral spring (at the bottom on the coil) like the hair spring of a watch. Bob __________________________________________________________ Subj: map additions.updates Date: 26/03/01 16:19:04 GMT Daylight Time From: davenn@.............. (David A. Nelson) hi all here's a list of the latest updates and additions to the PSN maps and database i take the opportunity of welcoming these fellow seismo junkies to the list hope u enjoy ur stay New additions..... 1)... Mauro Mariotti , Italy 2)... Steve Jones, Alabama, USA 3)... Andy Ibbotson, Bristol, England 4)... Al Foster, Indiana, USA Updates.... 1).. Don Wheeler .... channel file suffixes ohhhhh speaking of which Don... u gave me 2 suffixes dw1 and dw2 ur station info shows only one channel... what sort of seismo do u have on channel 2 ?? thanks all Dave Dave A. Nelson ZL4TBN 13 Monash Rd., Gladesville, (Sydney) 2111 NSW, Australia http://www.seismicnet.com/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 __________________________________________________________ Subj: N. CA PSN Meeting Date: 28/03/01 22:32:59 GMT Daylight Time From: cochrane@.............. (Larry Cochrane) Greetings, I asked Jim Lehman if he would be available Saturday the 21st during the day. I thought this would probably be the best time for most of the people who want to attend. Below is what I got from him. I'm open for suggestions on a date, time and place for the meeting. -Larry Cochrane Redwood City, PSN > Hello Larry--thanks for your reply about a possible PSN > meeting. Sat. the 21 April, I have signed up for the > all day "Great Faults of the Bay Area" field trip. If > Sat. is the only possible time, I could reconsider the > Field Trip--but viewing the faults would be special for > someone from the East!!! Keep me posted as to final > decision of place & time, and I will do my best to be > there.... > > -JIM __________________________________________________________ Subj: DSL Problems Date: 29/03/01 23:31:08 GMT Daylight Time From: cochrane@.............. (Larry Cochrane) All, My primary DSL line is down and won't be up again for a while. Without warning my XO (was Concentric) line went down today. I called XO and was told that the DSL carrier Covad went bankrupt and was shutting down there service. XO is in the process of moving lines over to their own service but it will take a month or more before this happens. Luckily I have a backup PacHell DSL line just for problems like this.... You may have problems accessing my site until the DNS changes I just made to move back to the PacHell DSL line come into effect. As a reminder there is a backup list server for the PSN-L mail list. The email address is psn-l@........ I just sent out a test message to make sure its working. Once a day my system transfers the member lists (both normal and digest) to the backup server so the members list is up to date. -Larry Cochrane Redwood City, PSN __________________________________________________________ Subj: Fwd: Solar Activity Date: 30/03/01 01:45:42 GMT Daylight Time From: johnjan@........ (The Lahrs) >Subject: Solar Activity > >From: "Donald C Herzog" >Date: Thu, 29 Mar 2001 10:31:12 -0700 > >March 29, 2001 > >Friends of Geomagnetism: > >The Sun has developed an enormous sunspot. It is the largest sunspot seen >in 10 years. The size of this spot would equate to the total surface area >of 13 Earths! > >It produced a coronal mass ejection (CME) yesterday that should hit the >Earth's magnetic field some time on Friday, and just today an X-class solar >flare erupted from that region that will send a second blast of plasma >directed toward the Earth and should arrive some time Saturday. The >Geomagnetic field should become very active and there is a good chance of >Auroral sightings. > >For those operating the magnetic observatories, please check your systems, >batteries, etc. to be sure we successfully record these events. > >For your interest, and courtesy of SOHO (NASA & ESSA), I have attached a >GIF image of the Sun showing this massive sunspot complex. > >Don > >(See attached file: sun010329.gif) > >------------------------------------------------------- >Donald C. Herzog TEL: 303.273.8487 >U.S. Geological Survey FAX: 303.273.8600 >Box 25046 MS 966 herzog@........ >Denver Federal Center http://geomag.usgs.gov >Denver, CO 80225-0046 >USA -------------------- * John C. and Jan H. Lahr * JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * Phone: (303) 215-9913 * http://lahr.org/john-jan _____________________________________________________ Subj: Re: DSL Line Date: 30/03/01 03:10:01 GMT Daylight Time From: cochrane@.............. (Larry Cochrane) Hi Karl, XO just called. They will no longer support residential service. If I stay with them I would have to pay $169.00 per month for a 192/192 kb line. That's a 3 X reduction in speed and a 3 X increase in price. For a 700/700 kb line I would have to pay $300.00 per month. -Larry ----- Original Message ----- From: "Karl Cunningham" To: Sent: Thursday, March 29, 2001 5:46 PM Subject: DSL Line > HI Larry -- > > I'm in the same boat here. My DSL provider was Northpoint through CTSnet, > my ISP, and they are scheduled to go down any minute now. My only > alternatives are 56K modem, the same DSL service for 1.5 times more $ than > before, or cable modem. > > I sure don't want to pay more money, I don't like the restrictions of > cable, and 56K sucks. I haven't decided which way I'll go but my ISP is > giving me free dial-up for a while in the meantime. > > You might look at http://www.dslreports.com if you want the gory details of > the shutdown. > > Better get this sent while it's still up. > > Karl __________________________________________________________ Subj: Satelite Telephone Date: 30/03/01 03:30:28 GMT Daylight Time From: Froom@............. (Jan Froom) Not PSN related, I know... but related to the resources of this group... I have a school project that is in need of a SATELLITE TELEPHONE SERVICE for about two months. Any suggestion where I might go to find such a service? The service is needed to upload web information to a web site where normal telephone & cellular services are not available... like out in the ocean. Thanks... Jan __________________________________________________________ Subj: Re: Satelite Telephone Date: 30/03/01 05:05:28 GMT Daylight Time From: travis5765@........... (Travis Farmer) I found this one via search engine. http://www.outfittersatellite.com/ -Travis ________________________________________________ Subj: long period galvanometers Date: 30/03/01 07:33:33 GMT Daylight Time From: sean@........... Dave and Bob, Last week there was a question about the long period (LP) galvanometer that was used for decades for the long period data of the WWNSS (worldwide network of standard seismographs). The galvo was of the Lehnner-Griffith design and had a free period of 100 seconds, although earlier ones were 90 seconds. Coupled with a 30 second seismometer, it provided very long period data for the WWNSS photo recording system. Considering their sensitivity and fragility, they were in use at over 200 stations worldwide. At SLU we operated several sets of 3 until the late 80's, when the cost of the photo paper forced us to abandon such recording. Even though modern digitizers were becoming practical, there was a lasting desire to preserve the 30-100 second system where the key characteristics of the system were maintained by stable mechanical parameters rather than the early analog electronic filters. Because of zero drift, the WWNSS LP seismometers were changed to 15 seconds in the mid 60's, but increasing the damping preserved most of the original response, which would extend to useful records of waveforms over 1000 seconds for very large earthquakes. The 100 second galvanometers were wonders of robustness and sensitivity, in spite of their extreme delicateness. A simple clamping knob allowed them to be moved and shipped while protecting the hair-fine gold band of the suspension. The greatest casualties occurred in the darkened photo-recording room when a galvo would be slid off its glass base plates and topple over while the recording light spot was being manually recentered. Later designs had a more massive base to reduce this. I don't have my specifications here at home, but I am very familiar with the mechanism since I am one of the few people who has ever replaced a broken suspension fiber in a 100 second galvo. The fiber is about 0.001" x 0.005" gold alloy. It must be strong enough to support the 500 ohm coil of about 20 grams and the attached first surface mirror of about 10 grams. The angular momentum of this mass was essential for achieving the long period. The fiber is about 8" long, housed in a 12" tube and magnet frame. The signal is conducted through the fiber from plastic insulators at the top of the tube to the top of the coil. Below the coil the signal passed thru a fine pigtail coil hanging from the base of the signal coil. The coil is about 0.75" x 1.5" surrounding the cylindrical central pole of the magnet, and the galvo clamping is achieved by lifting the coil against a light spring at the base of the pole, which allows the gold fiber to lay against a flat metal strip, held in place by static attraction. The galvo sensitivity is of the order of 10^-12 Ampere/meter (at the 1 meter distance from the photo drum). The upper support insulators rotate to allow centering the trace on the photo drum. This was a very sensitive adjustment, since the static recording spot had to be positioned within a few mm on the drum 1 meter away. One would sit on a stool (in the dark) and barely touch the adjusting knob, and then wait several minutes (the galvo was critically damped) for the spot to come to rest. Vertical adjustment of the fiber was also critical, so it would not act as a torsion seis in the presence of local acceleration. The galvo had a 1 m focal length cylindrical lens that formed a vertical line on the 10-inch cylindrical lens (rotated 90 deg); this formed the image of the illuminating lamp filament into a sharp spot on the photo record. The fiber was soldered with low-temperature alloy, which was a very delicate process; excess heat would amalgamate ( = vaporize) the fiber at the contact surface. I found that heating the contact while watching the continuity with an ohm meter until contact was made was relatively reproducible. Nonetheless, replacement fibers were supplied in boxes of 10 (a real disaster was to sneeze on an open box of new fibers). Of course, the real test of a replaced fiber was to stand up the galvo and unclamp the coil and hope it wouldn't just drop onto the magnet pole. Then, of course, it had to be recalibrated (and re-done if it was too far out of specification or asymmetrical because if off-axis alignment at the solder points.) In service, the suspensions would last for weeks to decades, or until one did something stupid, like adjusting the seis without clamping the galvo. In the 60's a set of 300+ second gavlos was made at UCB; the suspensions were about 1 meter long. These 100 second galvos of the WWNSS system provided decades of invaluable data about earthquakes and the earth itself because of their extension of sensitivity to periods of several hundred seconds, which was not realized until the late 80's by modern broadband fedback sensors and digitizers. Regards, Sean-Thomas __________________________________________________________ Subj: Re: GEOPHONES/BURROWING ANIMALS Date: 30/03/01 08:02:30 GMT Daylight Time From: cochrane@.............. (Larry Cochrane) Clive, A geophone would definitely pick up the movement of animals near the sensor. I'm not sure how you would interrupt the data. I'm CC'ing the PSN-L mailing list. Maybe someone on the list can help you out. PSN'ers please send email directly to Clive and CC the list. -Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Clive A Marks" To: Sent: Thursday, March 29, 2001 8:19 PM Subject: GEOPHONES/BURROWING ANIMALS > Hi, > > I'm a wildlife biologist in Victoria (Australia) interested in the > behaviour of large burrowing mammals. Is it worth investigating the > ability of geophones to detect burrowing sounds and animal movement > within burrows if they are placed in close proximity? Any advice would > be appreciated! > > Clive A Marks > Victorian Institute of Animal Science __________________________________________________________ Subj: Re: DSL Line Date: 30/03/01 17:25:49 GMT Daylight Time From: wfran@............. (Wayne Francis) Bob - I just finished my installation of the Starband system. Still learning to use it. There are advantages and disadvantages, of course. It's sure the heck better than dial-up tho. Would be happy to answer any questions. Wayne Francis Ojai, CA "bobshannon.org" wrote: > > Larry; > I am currently looking into two way satellite...No phone connections and > it is 70.00 per month for 500kb. Dish and installation is 700.00... > Bob > > > Hi Karl, > > > > XO just called. They will no longer support residential service. If I stay > > with them I would have to pay $169.00 per month for a 192/192 kb line. > > That's a 3 X reduction in speed and a 3 X increase in price. For a 700/700 > > kb line I would have to pay $300.00 per month > > __________________________________________________________ Subj: Web page general notes on graphite levitation Date: 30/03/01 21:47:49 GMT Daylight Time From: mlamb1@.......... (meredith lamb) Hi all, Completed the first general topic page of levitating various graphite over magnets. Our goal was to search for using this material for tiltmeters and/or seismometers, as its relatively unaffected by magnetic influences, as opposed to levitating neodymium magnets (which can also crudely detect earthquakes or natural or man made magnetic influences). The web page does not cover all past or present individual R&D topics, but it gives a fair introduction to the topic. The specific web page is: http://diamagnetics.users2.50megs.com/page016.html One can go to the main index reference at the bottom of the page, if there is further interest. Regards, Meredith Lamb __________________________________________________________ Subj: Re: GEOPHONES/BURROWING ANIMALS Date: 30/03/01 22:08:03 GMT Daylight Time From: travis5765@........... (Travis Farmer) Hmmm... That would pose a problem. It would depend on the size of the animal and the distance from the sensor. (A mole a 100' away would probably not show up) For prevent close proximity, maybe a cage (1/4" mesh) completely around, under and over the sensor (assuming the sensor is buried under ground) with a good amount of clearance. Larger animals like a groundhog or badger will make allot of "noise" though. Probably the best bet would be to have 2 sensors exactly the same placed around 50 - 100' apart. Then you can just compare results. Signals with a strong amplitude on one sensor and little or no amplitude will probably be an animal. Anybody else agree or have another idea (or a modification to mine)? -Travis _____________________________________________________ Subj: Re: GEOPHONES/BURROWING ANIMALS Date: 30/03/01 22:42:27 GMT Daylight Time From: karlc@.......... (Karl Cunningham) Hello Clive -- Chris Chapman (ChrisAtUpw@......... a member of this list, wrote me in the past about such things. If remember correctly, it was his opinion that using a piezoelectric sensor (or a microphone) attached to a rod driven into the ground would be a good detector for gophers or moles. If he is monitoring this list, perhaps he could elaborate. Using a geophone, I think you could probably detect rodents running through burrows and perhaps scratching a flea, but with a microphone you may hear them clicking their teeth or making other sounds. Of course all this depends on how far away they are. Karl Cunningham ________________________________________________ Subj: Re: DSL Line Date: 30/03/01 22:42:24 GMT Daylight Time From: david@............. (David Josephson) Karl, Larry, et al, Same story here in Santa Cruz. XO via Northpoint is gone. I ordered one line from Speakeasy ($100 a month with 5 static IP's for 1.5/384) and one from Internet Express ($50 a month with 1 static IP). Will see how they do. > > Hi Karl, > > XO just called. They will no longer support residential service. If I stay > with them I would have to pay $169.00 per month for a 192/192 kb line. > That's a 3 X reduction in speed and a 3 X increase in price. For a 700/700 > kb line I would have to pay $300.00 per month. > > -Larry ______________________________________________________ Subj: Re: DSL Line Date: 30/03/01 23:03:42 GMT Daylight Time From: david@............. (David Josephson) Hi all, The present cheap two-way satellite service is Starband. I have it in service here in Santa Cruz (plan to try it in some remote locations in a while). Note the fine print, "strive to" perform at 150 kb/sec up, 500 kb/sec down. I am getting 25-35 kb/sec up and 80-120 kb/sec down. I will have a server on it in the next couple of days if anyone wants to try some realworld tests with it. Their 500/150 promise is bunk. > Larry; > I am currently looking into two way satellite...No phone connections and > it is 70.00 per month for 500kb. Dish and installation is 700.00... > Bob ________________________________________________________ Subj: Re: DSL Line Date: 30/03/01 23:03:49 GMT Daylight Time From: karlc@.......... (Karl Cunningham) David, Larry, et al, You might have a reprieve. See http://biz.yahoo.com/apf/010330/northpoint_closure.html but Questions still remain... Karl _________________________________________________ Subj: RE: Fwd: Solar Activity Date: 31/03/01 06:41:23 GMT Daylight Time From: recla@.......... (Dennis Recla) Yes, up here in Southern Oregon, it's lighting up the North West Sky.. Beautiful !!! Haven't seen one of them in years.. Dennis -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of meredith lamb Sent: Friday, March 30, 2001 9:53 PM To: psn-l@.............. Subject: Re: Fwd: Solar Activity John, Interesting to see the gif image of the sunspot/flare. Recent projections show it hitting today and tomorrow. Can see the activity here now tonight, with my diamagnetic geomagnetometer and/or tiltmeter/seismo, as it is doing quite a bit of long period undulations frequently, that is definately not normal on a daily routine. Supposedly there is a good possiblity of more lower latitudes being able to see the aurora borealis perhaps tonight and tomorrow. Interesting. Regards, Meredith The Lahrs wrote: > >------------- Begin Forwarded Message ------------- > > > >Subject: Solar Activity > > > >From: "Donald C Herzog" > >Date: Thu, 29 Mar 2001 10:31:12 -0700 > > > >March 29, 2001 > > > >Friends of Geomagnetism: > > > >The Sun has developed an enormous sunspot. It is the largest sunspot seen > >in 10 years. The size of this spot would equate to the total surface area > >of 13 Earths! > > > >It produced a coronal mass ejection (CME) yesterday that should hit the > >Earth's magnetic field some time on Friday, and just today an X-class solar > >flare erupted from that region that will send a second blast of plasma > >directed toward the Earth and should arrive some time Saturday. The > >Geomagnetic field should become very active and there is a good chance of > >Auroral sightings. > > > >For those operating the magnetic observatories, please check your systems, > >batteries, etc. to be sure we successfully record these events. > > > >For your interest, and courtesy of SOHO (NASA & ESSA), I have attached a > >GIF image of the Sun showing this massive sunspot complex. > > > >Don > > __________________________________________________________ Subj: Re: Fwd: Solar Activity Date: 31/03/01 06:00:46 GMT Daylight Time From: mlamb1@.......... (meredith lamb) John, Interesting to see the gif image of the sunspot/flare. Recent projections show it hitting today and tomorrow. Can see the activity here now tonight, with my diamagnetic geomagnetometer and/or tiltmeter/seismo, as it is doing quite a bit of long period undulations frequently, that is definately not normal on a daily routine. Supposedly there is a good possiblity of more lower latitudes being able to see the aurora borealis perhaps tonight and tomorrow. Interesting. Regards, Meredith ________________________________________________ Subj: Re: Fwd: Solar Activity Date: 31/03/01 07:01:38 GMT Daylight Time From: johnk@....... (John Krempasky) I've never seen an Aurora before..I've got an Aquamarine glow with faint filaments visible covering the whole northern 1/3 of the sky here in Maryland. __________________________________________________________ Subj: RE: Fwd: Solar Activity Date: 31/03/01 07:01:50 GMT Daylight Time From: travis5765@........... (Travis Farmer) I'm sure i would be able to see them here in Maine (higher latitude than Oregon) but we are in the middle of a big snow storm. (predicted about 3 - 4", we have so far close to 12") If anybody could catch a few pictures, i would be greatfull as i haven't actualy them before. -Travis ___________________________________________________ Subj: Re: Fwd: Solar Activity Date: 31/03/01 08:31:24 GMT Daylight Time From: mortskm@....... (Stephen & Kathy) FYI,, got a call from neighbors a while ago asking what all the lights were about in the North,, I stepped outside to check it out to see the whole sky except for a little bit towards the south, lit up in reds and greens. My guess is that it is covering a full 2/3 of the sky!! Stephen PSN Station #55 near Pilot Hill Calif. being dazzled with northern lights at: 38.828N 120.979W ____________________________________________________ Subj: RE: AURORA Date: 31/03/01 09:24:52 GMT Daylight Time From: kareemjupiter@............. (Kareem Lanier, Sir JooJoo) Well, from El Sobrante, Ca or 30 miles north of San Francisco. Large areas of the northern sky were immersed in red hues with an occasional faint burst of gray streaks... very very bizarre! Will there be more!? -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of IESN Sent: Friday, March 30, 2001 11:59 PM To: psn-l@.............. Subject: AURORA Someone have a video or photo-frame of this great Aurora to post? Unfortunatly, we couldn't to see it....from our emisphere. Cheer Francesco Italy __________________________________________________________ Subj: Re: Solar Activity Date: 31/03/01 10:30:21 GMT Daylight Time From: ethelen@........ (ed thelen) Reading all of this excitement I just had to go outside (suburban Fremont, CA - 60 ft above see level) and take a look. (Fremont is about 40 miles S.E. of San Francisco, CA) About 37N 34 and 121W 58 Moving about to block out street lights with neighbor houses and trees, I got a darker look at the northern sky - up to about 45 degrees had a strange green cast - unusal in that most street lights here are orange-yellow. And then there was a difuse (no sharp borders - not intense) shocking pink long narrow area from near the northern horizon to about 45 degrees high - and then the pink seemed in the form of hich cirus clouds - except that you could clearly see stars through both the green cast and the shocking pink - Decided this was real, not a overwought imagination - and took the car up the ridge east of town for another look with out the street light hazzard. Still there - much easier to see. I moved here from Minnesota in 1970 - and haven't seen "Northern Lights" for 30 years - of course haven't looked much either. Thanks for the wake up! Ed Thelen _____________________________________________________ Subj: Re: Solar Activity Date: 31/03/01 10:50:45 GMT Daylight Time From: davenn@.............. (David A. Nelson) jst talking to a friend back home in dunedin city southern New Zealand where i used to live.... its a total sky aurora there tonite (saturday 31 9 pm nzst) the whole sky is aglow horizon to horizon many green and red rays going up through the glow to a coronal point at zenith (ie. directly overhead) totally awesome im so jealous.... sydney aussie is too far nth to see aurora Dave Dave A. Nelson ZL4TBN 13 Monash Rd., Gladesville, (Sydney) 2111 NSW, Australia http://www.seismicnet.com/dave/home.htm __________________________________________________________ Subj: Re: Solar Activity Date: 31/03/01 13:43:06 GMT Daylight Time From: other@............... (Mark Robinson) Don't write it off as impossible because of your latitude Dave, I remember reports of aurora being seen in Auckland, probably at the last sunspot peak 11 years ago, and Sydney is not all that much further north. An impressive display just finished (midnight) here in Otaki on the Kapiti coast of New Zealand. It reached high into the sky so I imagine that the effects may be visible considerably further north. Large areas of brith pink / crimson glow about 45 degrees above the horizon to the south, with white beams like searchlights rising through it from the horizon. There were a few moments of the classic veiled effect that is often depicted in paintings as well. Mark __________________________________________________ Subj: Re: AURORA Date: 31/03/01 14:09:34 GMT Daylight Time From: earth@........... (bobshannon.org) Dennis Anderson makes a living photographing the auroras. He has been a Pinpoint subscriber for a few months now....Last week I bought one of his pictures...BOY! What a photographer....If you want to see some impressive shots, view his site at: http://www.auroradude.homestead.com/aurora.html Bob-Pinpoint Earthquake News --Since 1992 __________________________________________________________ Subj: Solar flare/geomagnetic graphs Date: 31/03/01 20:27:29 GMT Daylight Time From: mlamb1@.......... (meredith lamb) Hi all, For those interested, I put up a web page on a interesting portion of the solar flare and its earth time arrive and effects on the earth and my geomagnetic/tiltmeter/seismo of the 31st in relation to my location in Denver Colorado. The USGS geomagnetic graph was borrowed from the result of its station in Boulder, Colorado, as a comparison. http://diamagnetics.users2.50megs.com/page061.html Regards, Meredith Lamb __________________________________________________________ Subj: Re: N. CA PSN Meeting Date: 31/03/01 14:45:30 GMT Daylight Time From: dwebb2@.............. (Dick Webb) Hello, I too will be going on the Saturday field trip and like Jim, it is a must see for someone from North Carolina. My only suggestion would be to meet at noon on Thursday or Friday or on Friday evening. As to where, perhaps we could start at the meeting headquarters hotel. (Cathedral Hill Hotel). I suspect that these suggestions might not be easy for people living (and working) in the Bay area who are not attending the meetings. Dick At 01:32 PM 3/28/01 -0800, you wrote: >Greetings, > >I asked Jim Lehman if he would be available Saturday the 21st during the >day. I thought this would probably be the best time for most of the people >who want to attend. Below is what I got from him. I'm open for suggestions >on a date, time and place for the meeting. > >-Larry Cochrane >Redwood City, PSN > > > Hello Larry--thanks for your reply about a possible PSN > > meeting. Sat. the 21 April, I have signed up for the > > all day "Great Faults of the Bay Area" field trip. If > > Sat. is the only possible time, I could reconsider the > > Field Trip--but viewing the faults would be special for > > someone from the East!!! Keep me posted as to final > > decision of place & time, and I will do my best to be > > there.... > > > > -JIM ________________________________________________________ Subj: Re: GEOPHONES/BURROWING ANIMALS Date: 31/03/01 15:32:52 GMT Daylight Time From: dcrice@............ (Doug Crice) Clive, You have to be careful about words. Geophone in the geophysical sense is normally a vibration sensor, which would pick up digging vibrations but not sounds. You would probably be better served by an actual microphone designed for acoustic signals. Interestingly enough, in the utility locating culture, there is a device also called a "geophone" which is designed to pick up the sound of leaking water pipes. That might be a better tool. Look in the telephone directory under "Utility Locating" and on the web for Metrotech and Radiodetection companies. You may want to also look into ground penetrating radar if you would like to map the burrows from the surface. See animal burrows on my web site http://www.georadar.com. I can get you names of some local GPR folks if you would like to try it. Doug Crice Larry Cochrane wrote: > Clive, > > A geophone would definitely pick up the movement of animals near the sensor. > I'm not sure how you would interrupt the data. I'm CC'ing the PSN-L mailing > list. Maybe someone on the list can help you out. > > PSN'ers please send email directly to Clive and CC the list. > > -Larry Cochrane > Redwood City, PSN > > ----- Original Message ----- > From: "Clive A Marks" > To: > Sent: Thursday, March 29, 2001 8:19 PM > Subject: GEOPHONES/BURROWING ANIMALS > > > Hi, > > > > I'm a wildlife biologist in Victoria (Australia) interested in the > > behaviour of large burrowing mammals. Is it worth investigating the > > ability of geophones to detect burrowing sounds and animal movement > > within burrows if they are placed in close proximity? Any advice would > > be appreciated! > > > > Clive A Marks > > Victorian Institute of Animal Science __________________________________________________________ Subj: Re: GEOPHONES/BURROWING ANIMALS Date: 31/03/01 19:02:49 GMT Daylight Time From: roybar@........ (BOB BARNS) Doug, It's good to make clear an essential distinction. I just so happens that both the acoustical and seismic detectors are being auctioned on ebay now. there are two listings for stereo acoustic geophones: 1. 1420495289 ends 4/5 2. 1226438427 ends 4/9 There are 5 seismic geophones: 1. 1225885987 ends 4/2 2. 1225725023 ends 4/3 3. 1225881658 ends 4/4 4. 1225885249 ends 4/4 5. a lot of 6 is 1225887090 ends 4/4 Bob Doug Crice wrote: > > Clive, > > You have to be careful about words. Geophone in the geophysical sense is > normally a vibration sensor, which would pick up digging vibrations but not > sounds. You would probably be better served by an actual microphone designed for > acoustic signals. Interestingly enough, in the utility locating culture, there > is a device also called a "geophone" which is designed to pick up the sound of > leaking water pipes. That might be a better tool. Look in the telephone > directory under "Utility Locating" and on the web for Metrotech and > Radiodetection companies. > > You may want to also look into ground penetrating radar if you would like to map > the burrows from the surface. See animal burrows on my web site > http://www.georadar.com. I can get you names of some local GPR folks if you > would like to try it. > > Doug Crice > > Larry Cochrane wrote: > > > Clive, > > > > A geophone would definitely pick up the movement of animals near the sensor. > > I'm not sure how you would interrupt the data. I'm CC'ing the PSN-L mailing > > list. Maybe someone on the list can help you out. > > > > PSN'ers please send email directly to Clive and CC the list. > > > > -Larry Cochrane > > Redwood City, PSN _________________________________________________________