Subject: What's this? From: Jack Ivey ivey@.......... Date: Wed, 31 Mar 2004 18:01:03 -0500 Hi all, Does anyone know what a model SD-217 from Teledyne Earth Science is? 5" dia X 8" high. Thanks, Jack __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: harmonics From: "tdick" dickthomas01@............. Date: Thu, 1 Apr 2004 08:51:51 -0600 What is the best way to remove harmonics in Lehman without changing the period? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: harmonics From: "Connie and Jim Lehman" lehmancj@........... Date: Thu, 1 Apr 2004 10:21:32 -0500 Dick--I'm at a loss to know exactly what "harmonics" you speak of??? I know this is April 1----Are you speaking of the natural period of the pendulum??? More info please-- Have a great day! Jim Lehman ----- Original Message ----- From: "tdick" To: Sent: Thursday, April 01, 2004 9:51 AM Subject: harmonics > What is the best way to remove harmonics in Lehman without changing the > period? > > > __________________________________________________________ > > 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: harmonics From: "tdick" dickthomas01@............. Date: Thu, 1 Apr 2004 09:21:16 -0600 No -- not April Fool's thing -- have setup Lehmans with longer period but have harmonics > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: harmonics From: Jack Ivey ivey@.......... Date: Thu, 1 Apr 2004 11:54:29 -0500 Nope, still don't know what you mean. Do you mean unwanted vibrational modes and/or cross-axis sensitivity, i.e. your horizontal boom has a 15 s period, but it also bounces vertically at 0.5 s period? What's the symptom? Jack -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of tdick Sent: Thursday, April 01, 2004 10:21 AM To: psn-l@.............. Subject: Re: harmonics No -- not April Fool's thing -- have setup Lehmans with longer period but have harmonics > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Analog Design Tools From: Karl Cunningham karlc@.......... Date: Fri, 02 Apr 2004 15:57:45 -0800 If you're doing analog design (amplifiers, filters, etc.) you might want to check out Texas Instruments' analog design tools on their web site... http://www.ti.com/amplifier_utilities Especially the program to build 1% resistor values from paralleling 5% components, and FilterPro is VERY good. Regards, Karl Cunningham __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Simple mini horizontal From: "Ted Rogers" tedr@.................. Date: Thu, 8 Apr 2004 08:52:05 +1000 Hi John has kindly posted my attempt at a 'mini horizontal' seismograph, if you are interested please go to: http://jclahr.com/science/psn/rogers/ I would be grateful for an comments or improvements you may think I might incorporate in the unit, especially in the area of feed back to the light source. Regards Ted Rogers __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Simple mini horizontal From: "Steve Hammond" shammon1@............. Date: Wed, 7 Apr 2004 16:48:30 -0700 Ted, I took a quick look, that does not look simple to me... Looks neat-- Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Ted Rogers Sent: Wednesday, April 07, 2004 3:52 PM To: psn-l@.............. Cc: John Lahr Subject: Re: Simple mini horizontal Hi John has kindly posted my attempt at a 'mini horizontal' seismograph, if you are interested please go to: http://jclahr.com/science/psn/rogers/ I would be grateful for an comments or improvements you may think I might incorporate in the unit, especially in the area of feed back to the light source. Regards Ted Rogers __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Simple mini horizontal From: "David H. Youden" dyouden@............. Date: Thu, 08 Apr 2004 11:06:24 -0400 Ted, I took a look at John's website and I think that you did a nice job. I like it. I am fooling with using a 500 second integrator for leveling bias. The output of the integrator is applied to the motor at the summing junction of the PID feedback loop. It seems to work OK but I may just bite the bullet and add a second motor dedicated to simply providing the position bias. I hate to add the extra wire, so I will test the existing system for a bit before I give up on it. Dave Youden > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Simple mini horizontal From: "Ted Rogers" tedr@.................. Date: Fri, 9 Apr 2004 19:05:26 +1000 David Tanks for the complement, I know it's not really a 'simple mini horizontal' but it was inspired by John Lahr's model as seen on his web site. The reason I though about using the light source in the sensor assembly to overcome tilting was to over come the use of motors etc. to remotely level the unit. As I am using a tapered 'flag' and tilt either due to temperature or ground movement would alter the amount of light reaching the phototransistor. Having set a stable sensor output level and a reference voltage equal to it, the idea was that any (very) slow change in output level would be compared to the reference voltage and the light source adjusted to compensate, I did suggest 1 minute integration but about 10 minutes would seem to be a better figure. Regards Ted Rogers > Ted, > > I took a look at John's website and I think that you did a nice job. I > like it. > > I am fooling with using a 500 second integrator for leveling bias. The > output of the integrator is applied to the motor at the summing junction > of the PID feedback loop. It seems to work OK but I may just bite the > bullet and add a second motor dedicated to simply providing the position > bias. I hate to add the extra wire, so I will test the existing system > for a bit before I give up on it. > > Dave Youden > > > > > > > __________________________________________________________ > > 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: Software for Radio Shack DI-150RS From: "Dewayne Hill" n0ssy@........... Date: Sat, 10 Apr 2004 10:59:24 -0600 I had to format my hard drive. I lost my software for my DR-150RS. If anyone has a copy can you send it to me? Dewayne Hill - n0ssy N39 50.139 W105 3.748
I had to format my hard drive. I lost my software for my = DR-150RS.
 
If anyone has a copy can you send it to me?

Dewayne Hill - n0ssy
N39 50.139
W105 = 3.748
Subject: Fwd: SPRENGNETHER 5000 HORIZONAL LONG PERIOD SEISMOMETER From: "Larry Cochrane" lcochrane@.............. Date: Sat, 10 Apr 2004 22:43:38 -0700 Hi everyone, I was asked by Jim Allen to forward the following message to the list. He uses AOL so he's not on the PSN-L list any more. -Larry I just received a Spregnether 5000 long period horizontal seismometer similar to the ones on Meredith Lamb's website. However, it is missing the lower far rear piece that clamps the pivot wire. Its the piece that floats just ahead of the frame (approximately 2+ inches long). If anyone has parts or know a source for parts for this unit I would appreciate hearing from them so I can get the unit working. If anyone can help, please respond directly to my email: radiotel@....... __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Software for Radio Shack DI-150RS From: Stephen & Kathy skmort@.......... Date: Sat, 10 Apr 2004 22:47:12 -0700 Hi Dewayne,, I run a DI-150RS which I bought from Radio Shack some years ago! The program they sent with the unit did not work,,,, I had to download a program from the Dataq web site,,, (you now have to register to get to their support site,,, I haven't bothered to register yet,, so I don't know what their latest versions might be!) I am now running version 2.66 the downloaded program is named new100nt.exe it has both the record and playback programs as well as some samples and is about 2,106 kb! I also have a version 2.72 which I haven't tried yet,,, it is supposed to have event triggers,,, it is also called new100nt.exe and is about 2,877 kb During setup, it asks which dataq unit you have, so it will run several (but not all) dataq units??? Off hand I don't remember which ones they were???? If you think you would like to try them, I will be glad to burn either, or both on a CD and send them to you!! My email is skmort@.......... Stephen psn Station #55 38.828N 120.979W > Dewayne Hill wrote: > > I had to format my hard drive. I lost my software for my DR-150RS. > > If anyone has a copy can you send it to me? > > Dewayne Hill - n0ssy > N39 50.139 > W105 3.748 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: OT for Stephen From: "Bob Shannon" earth@........... Date: Sun, 11 Apr 2004 02:17:45 -0700 -----Original Message----- Stephen; Have lost your email. Please send me a note to reply to. Bob Shannon Pinpoint From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Stephen & Kathy Sent: Saturday, April 10, 2004 10:47 PM To: psn-l@.............. Subject: Re: Software for Radio Shack DI-150RS __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Gorda Locked From: "Bob Shannon" earth@........... Date: Sun, 11 Apr 2004 07:10:21 -0700 I have been thinking about Gorda and its locked position for a long time now...but this AM I awoke with a question I don't believe I have ever asked....Is there any other scenario in the world, similar to Gorda where a small plate is locked and could break loose???? Bob Shannon __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Fwd: SPRENGNETHER 5000 HORIZONAL LONG PERIOD SEISMOMETER From: "Meredith Lamb" meredithlamb@............. Date: Sun, 11 Apr 2004 13:57:10 -0600 Hi Jim, Highly doubt a spare will be found due to the age of the instrument.....it was discontinued many years ago....even though it a very reliable and highly effective seismometer. I think its a piece one can either carefully homebrew or have a machine shop ($) make. I think the part can be made from 1/2" X 1/2" X ~1.75" length keystock iron found in hardware stores. Its sold as square rods about 1 foot long. "IF", you try this, I'd take along a file to make sure the keystock is metal workable (the iron can be filed); some keystock is heat treated and is so hardened it might not be workable. It doesn't have to be a exact match of the original to function. After drilling the wire hole; I'd install two setscrews on another opposite side, to hold the wire from moving. The boom "prong" holes are probably deep enough to where its about 2/3rds through the thickness for stability. With your boom prongs, you can measure their relative distance from the centered wire hole center. Making this part is probably the only alternative. Take care, Meredith > [Original Message] > From: Larry Cochrane > To: > Date: 4/10/2004 11:43:38 PM > Subject: Fwd: SPRENGNETHER 5000 HORIZONAL LONG PERIOD SEISMOMETER > > Hi everyone, > > I was asked by Jim Allen to forward the following message to the list. He > uses AOL so he's not on the PSN-L list any more. -Larry > > I just received a Spregnether 5000 long period horizontal seismometer > similar to the ones on Meredith Lamb's website. However, it is missing the > lower far rear piece that clamps the pivot wire. Its the piece that floats > just ahead of the frame (approximately 2+ inches long). If anyone has parts > or know a source for parts for this unit I would appreciate hearing from > them so I can get the unit working. > If anyone can help, please respond directly to my email: radiotel@....... __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Gorda Locked From: John Hernlund hernlund@............ Date: Sun, 11 Apr 2004 13:01:28 -0700 Yes, this is a common scenario in several subduction zones, where the largest earthquakes are generated. The Juan de Fuca and Gorda plates are a bit of an oddity though, since the ridge is so close to the trench, making the plate size and age smaller. The young age means the ocean lithosphere is thin and the whole thing is more buoyant than old oceanic lithosphere (it resists being pushed under). A similar plate scenario exists in southwestern Mexico (Oaxaca region) and parts of the west coast of South America (parts of the Japan subduction zone also get locked up and can generate giant EQs, although the age of subducting plate is different in the north and south). JdF and Gorda are dangerous, since the recurrence interval is so long compared to those in other places and if you are around for one, things might not be so good. Perhaps a more important measure is the recurrence interval times the plate convergence speed, which gives you the average length of convergence (offset) per earthquake, which in turn figures into the magnitude of the EQ that can be generated (offset times fault area times shear modulus). Another good practical measure is a person's average lifespan divided by the recurrence interval in the area they live in...which in the case of the Pac NW turns out to be nice and small compared to Oaxaca (which is probably the most dangerous of all when coupled with population, economic and engineering factors). A similar recurrence interval to the Pac NW exists for the giant thrust fault system that cuts across LA. Cheers! John On Sunday, April 11, 2004, at 07:10 AM, Bob Shannon wrote: > > > I have been thinking about Gorda and its locked position for a long > time > now...but this AM I awoke with a question I don't believe I have ever > asked....Is there any other scenario in the world, similar to Gorda > where a small plate is locked and could break loose???? > Bob Shannon > > __________________________________________________________ > > 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: Fwd: SPRENGNETHER 5000 HORIZONAL LONG PERIOD SEISMOMETER From: apsn apsn@........... Date: Sun, 11 Apr 2004 14:19:55 -0800 I might have what you need, Jim. I think I have parts for a Sprengnether 5000 vertical or horizontal, I cannot remember which. Give me some time to find them and see if they match what you're after. Bob http://apsn.awcable.com At 11:57 AM 4/11/2004, Meredith Lamb wrote: >Hi Jim, > >Highly doubt a spare will be found due to the age of the instrument.....it >was >discontinued many years ago....even though it a very reliable and highly >effective >seismometer. > >I think its a piece one can either carefully homebrew or have a machine >shop ($) >make. I think the part can be made from 1/2" X 1/2" X ~1.75" length >keystock iron >found in hardware stores. Its sold as square rods about 1 foot long. >"IF", you try this, >I'd take along a file to make sure the keystock is metal workable (the iron >can be filed); >some keystock is heat treated and is so hardened it might not be workable. >It doesn't >have to be a exact match of the original to function. After drilling the >wire hole; I'd >install two setscrews on another opposite side, to hold the wire from >moving. The >boom "prong" holes are probably deep enough to where its about 2/3rds >through the >thickness for stability. With your boom prongs, you can measure their >relative distance >from the centered wire hole center. Making this part is probably the only >alternative. > >Take care, Meredith > > > > [Original Message] > > From: Larry Cochrane > > To: > > Date: 4/10/2004 11:43:38 PM > > Subject: Fwd: SPRENGNETHER 5000 HORIZONAL LONG PERIOD SEISMOMETER > > > > Hi everyone, > > > > I was asked by Jim Allen to forward the following message to the list. He > > uses AOL so he's not on the PSN-L list any more. -Larry > > > > I just received a Spregnether 5000 long period horizontal seismometer > > similar to the ones on Meredith Lamb's website. However, it is missing >the > > lower far rear piece that clamps the pivot wire. Its the piece that >floats > > just ahead of the frame (approximately 2+ inches long). If anyone has >parts > > or know a source for parts for this unit I would appreciate hearing from > > them so I can get the unit working. > > If anyone can help, please respond directly to my email: radiotel@....... > > > >__________________________________________________________ > >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: Quake scientist's conference From: "Erich Kern" efkern@............. Date: Wed, 14 Apr 2004 13:06:41 -0700 From: www.thedesertsun.com The Desert Sun / Palm Springs, California Forecast the buzz as quake scientists gather By Benjamin Spillman The Desert Sun April 14th, 2004 -------------------------------------------------------------- It's tough to fault seismologists for earthquakes that rocked the Los Angeles basin in 1994 and the Bay Area in 1989. But the group of researchers who in both years held conferences near those memorable temblors are now in Palm Springs -- and some are predicting a major quake along the desert's slice of the San Andreas. The expectation that the southern portion of the famous fault is likely to rupture is based on more than a scheduling quirk or the fact that this is Earthquake Preparedness Month. But the annual conference of the Seismological Society of America comes at a time when earthquake prediction is a hot topic in the field. The conference, described by an organizer as an event "for the real purists" of seismology, includes a highly anticipated forum with one forecaster who is predicting a 6.4 magnitude or greater quake in the desert by Sept. 5. Another researcher will present data he says indicates the San Andreas fault is set to enter a period of especially frequent and more intense shaking. "It seems perfect," said University of Oregon professor Ray Weldon of the conference location. "That is going to be about the center of the rupture if we are all right." Weldon will speak today at the event about data he and student researchers have spent 18 years gathering from the San Andreas fault near Wrightwood. They say data from the site shows the fault has had varying levels of stress in the past 1,500 years. Today, the fault shows high levels of stress, suggesting a period of strain release, via earthquakes, is near, he said. The research generally applies along the fault from about Palmdale to the Salton Sea. Although Weldon doesn't offer a quake prediction per se, he said the work complements a prediction by Russian scientist Vladimir Keilis-Borok, the UCLA researcher forecasting the 6.4 magnitude or greater quake in the desert. "You could consider that support," Weldon said. "But I don't lend any insight or support to a window of time." The Keilis-Borok earthquake prediction window has been a major topic of conversation among seismologists this year. Keilis-Borok and his team used a mathematical formula based on past seismic activity to predict a temblor somewhere in an approximately 12,000 square-mile swath of desert that includes the Coachella Valley. "Even two years back it was practically a dirty word to say earthquake prediction," said Nancy Sauer, a conference organizer. The buzz around predictions this year is reminiscent of earlier enthusiasm for earthquake forecasting in the late 1970s and early 1980s, said John McRaney, associate director of the Southern California Earthquake Center. But for the most part those efforts fizzled, McRaney said. "It was so unsuccessful . people sort of shied away for about 20 years," he said. Rich Eisner, manager of earthquake programs for the California Office of Emergency Services, recalls trekking to the tiny California town of Parkfield around 1988 in response to a high-profile earthquake prediction. Parkfield, population 37, was then known for its proximity to the site of the car accident that killed actor James Dean, Eisner said. However, when researchers predicted a major temblor would occur in the area within a three-day window, scientists and media flocked to the area, he said. "It became an opportunity to catch the earthquake," Eisner said. "Most of the time earthquakes occur and the instruments are in the wrong location." The quake never materialized, but Parkfield emerged with the self-proclaimed title "earthquake capital of the world" and the Office of Emergency Services still has an earthquake response plan it formed around the time of the old prediction. "From our standpoint, it was a productive and successful exercise," Eisner said. Now, with Keilis-Borok scheduled to speak Thursday afternoon, the one-time dirty word could be the highlight of the society's conference, an event they've held almost every year since 1907. "There is something going on," Sauer said. "People are at least willing to entertain the idea. It is not seen so much as junk science." Keilis-Borok isn't talking about his work right now because he wants it to appear in a journal that discourages researchers from speaking to the press before publication of a scientific article. The conference, which was scheduled more than a year before the desert quake prediction, represents a confluence of an opportunity to listen directly to Keilis-Borok at a location well within his prediction zone. "Everyone is talking about it," said Lisa Grant, a University of California, Irvine geologist who will attend the conference. "Earthquake prediction is the holy grail of earthquake science." -------------------------------------------------------------- Benjamin Spillman can be reached at 778-4643 © Gannett Co., Inc., 7950 Jones Branch Drive, McLean, VA 22107 . (703) 854-6000 Copyright © 2004 The Desert Sun. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: computer time sync From: "tdick" dickthomas01@............. Date: Wed, 14 Apr 2004 20:52:28 -0500 I am using Dimension 4 to sync the time on the computer that runs only WinSDR. My time seems to vary. In an event yesterday, St. Louis network and my computer were 20 seconds off for the same event. Any suggestions? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: computer time sync From: sismos@.............. Date: Thu, 15 Apr 2004 02:41:10 +0000 Hello, I also have notice over the last year that that it is harder to get good time from timeservers. Every little Dlink dsl router (and most other brands) have time clients and the timeservers in many cases can't respond in a timely way because of the huge number of request. I now have my main computer with a GPS and I send the time with Tardis to all the computers on my network who listen with K9 it is a bit better. I am slowly moving to GPS on all systems. Consider GPS or WWV You also might consider using Righttime software, I would hold your time much better than 20 seconds. I think all station should have good time. Angel Thursday, April 15, 2004, 1:52:28 AM, you wrote: t> I am using Dimension 4 to sync the time on the computer that runs only t> WinSDR. My time seems to vary. In an event yesterday, St. Louis network and t> my computer were 20 seconds off for the same event. Any suggestions? t> __________________________________________________________ t> Public Seismic Network Mailing List (PSN-L) t> To leave this list email PSN-L-REQUEST@.............. with t> the body of the message (first line only): unsubscribe t> See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: 1906 epicenter data From: "Kareem Lanier" kareem@............. Date: Wed, 14 Apr 2004 19:46:42 -0700 Does anyone know where I can get the latest information on the 1906 epicenter? Kareem ---------------------------------------------------------------------------- ------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
Does anyone know where I can get the latest = information=20 on the 1906 epicenter?
 
 
Kareem
 
----------------------------------------------------------------= -------------------------------
Kareem's = HeyJooJoo.Com - Discover, Explore, = Learn &=20 Play
 
All of my = outgoing and=20 incoming emails are scanned for viruses and worms by my antivirus=20 software.
 
Subject: RE: 1906 epicenter data From: "Steve Hammond" shammon1@............. Date: Wed, 14 Apr 2004 21:15:33 -0700 Kereem, hereis a Berkeley Informational site with the info you requested. http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_1906.html Regards, Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Wednesday, April 14, 2004 7:47 PM To: PSN Subject: 1906 epicenter data Does anyone know where I can get the latest information on the 1906 epicenter? Kareem -------------------------------------------------------------------------- --------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
Kereem, hereis a Berkeley Informational site with the info you = requested.=20
http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_190= 6.html
 
Regards, Steve Hammond
PSN=20 San Jose  Aptos, CA
-----Original Message-----
From: = psn-l-request@................. [mailto:psn-l-request@...............On Behalf Of Kareem=20 Lanier
Sent: Wednesday, April 14, 2004 7:47 PM
To: = PSN
Subject: 1906 epicenter data

Does anyone know where I can get the latest = information on the 1906 epicenter?
 
 
Kareem
 
----------------------------------------------------------------= -------------------------------
Kareem's = HeyJooJoo.Com - Discover, Explore, = Learn &=20 Play
 
All of my = outgoing and=20 incoming emails are scanned for viruses and worms by my antivirus = software.
 
Subject: RE: 1906 epicenter data From: "Kareem Lanier" kareem@............. Date: Wed, 14 Apr 2004 21:21:45 -0700 Thanks Steve. Do you know if there's been any recent studies done on the precise epicenter of the 1906 event? Olema versus offshore of Daly City. Kareem _____ From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Steve Hammond Sent: Wednesday, April 14, 2004 9:16 PM To: psn-l@.............. Subject: RE: 1906 epicenter data Kereem, hereis a Berkeley Informational site with the info you requested. http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_1906.html Regards, Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Wednesday, April 14, 2004 7:47 PM To: PSN Subject: 1906 epicenter data Does anyone know where I can get the latest information on the 1906 epicenter? Kareem ---------------------------------------------------------------------------- ------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
Thanks Steve. =
 
Do you know if = there's been any=20 recent studies done on the precise epicenter of the 1906 event?=20
Olema versus = offshore of Daly=20 City.
 
Kareem


From: psn-l-request@................. [mailto:psn-l-request@............... On Behalf Of Steve=20 Hammond
Sent: Wednesday, April 14, 2004 9:16 PM
To:=20 psn-l@..............
Subject: RE: 1906 epicenter=20 data

Kereem, hereis a Berkeley Informational site with the info you = requested.=20
http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_190= 6.html
 
Regards, Steve Hammond
PSN=20 San Jose  Aptos, CA
-----Original Message-----
From: = psn-l-request@................. [mailto:psn-l-request@...............On Behalf Of Kareem=20 Lanier
Sent: Wednesday, April 14, 2004 7:47 PM
To: = PSN
Subject: 1906 epicenter data

Does anyone know where I can get the latest = information on the 1906 epicenter?
 
 
Kareem
 
----------------------------------------------------------------= -------------------------------
Kareem's = HeyJooJoo.Com - Discover, Explore, = Learn &=20 Play
 
All of my = outgoing and=20 incoming emails are scanned for viruses and worms by my antivirus = software.
 
Subject: RE: 1906 epicenter data From: "Steve Hammond" shammon1@............. Date: Wed, 14 Apr 2004 22:13:39 -0700 Hi Kareem. I'm not aware of any new studies. The USGS Professional Paper 1515, The San Andreas Fault System, Calif., provides the following: 1906/04/18 13:12 UTC 37*24' Lat N. 121*54' Long W. This location is right off the cost near UCSF. Olema is credited with having the peak displacement of 6m measured. Regards, Steve PSN San Jose Aptos, CA [Steve Hammond] Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Wednesday, April 14, 2004 9:22 PM To: psn-l@.............. Subject: RE: 1906 epicenter data Thanks Steve. Do you know if there's been any recent studies done on the precise epicenter of the 1906 event? Olema versus offshore of Daly City. Kareem ---------------------------------------------------------------------------- -- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Steve Hammond Sent: Wednesday, April 14, 2004 9:16 PM To: psn-l@.............. Subject: RE: 1906 epicenter data Kereem, hereis a Berkeley Informational site with the info you requested. http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_1906.html Regards, Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Wednesday, April 14, 2004 7:47 PM To: PSN Subject: 1906 epicenter data Does anyone know where I can get the latest information on the 1906 epicenter? Kareem ------------------------------------------------------------------------ ----------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
Hi=20 Kareem. I'm not aware of any new studies. The USGS Professional Paper = 1515, The=20 San Andreas Fault System, Calif., provides the = following:
1906/04/18 13:12 UTC  37*24' Lat N. 121*54' Long W.  = This=20 location is right off the cost near UCSF. Olema is credited with having = the peak=20 displacement of 6m measured.
Regards, Steve
PSN San = Jose Aptos,=20 CA
[Steve=20 Hammond] 
 Message-----
From:=20 psn-l-request@.............. [mailto:psn-l-request@...............On = Behalf=20 Of Kareem Lanier
Sent: Wednesday, April 14, 2004 9:22=20 PM
To: psn-l@..............
Subject: RE: 1906 = epicenter=20 data

Thanks Steve.=20
 
Do you know if = there's been any=20 recent studies done on the precise epicenter of the 1906 event?=20
Olema versus = offshore of Daly=20 City.
 
Kareem


From: psn-l-request@.............. = [mailto:psn-l-request@............... On Behalf Of Steve=20 Hammond
Sent: Wednesday, April 14, 2004 9:16 = PM
To:=20 psn-l@..............
Subject: RE: 1906 epicenter=20 data

Kereem, hereis a Berkeley Informational site with the info = you=20 requested.
http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_190= 6.html
 
Regards, Steve Hammond
PSN=20 San Jose  Aptos, CA
-----Original Message-----
From:=20 psn-l-request@.............. = [mailto:psn-l-request@...............On=20 Behalf Of Kareem Lanier
Sent: Wednesday, April 14, = 2004 7:47=20 PM
To: PSN
Subject: 1906 epicenter=20 data

Does anyone know where I can get the = latest=20 information on the 1906 epicenter?
 
 
Kareem
 
----------------------------------------------------------------= -------------------------------
Kareem's = HeyJooJoo.Com - Discover, Explore, = Learn=20 & Play
 
All of = my outgoing and=20 incoming emails are scanned for viruses and worms by my = antivirus=20 software.
 
Subject: Re: computer time sync From: "Larry Cochrane" lcochrane@.............. Date: Thu, 15 Apr 2004 01:20:25 -0700 The time stamping of the data is preformed on the A/D board not on the computer running WinSDR. If you want very accurate timing, down to a few milliseconds, you will need to use GPS. The GPS receiver connects up to the A/D board so it can uses the highly accuracy 1 pulse per second signal generated by the GPS receiver to time stamp the data. See http://www.seismicnet.com/gps/index.html for a GPS timing system that will work with my A/D board. You can use the computer running WinSDR to supply timing information to the A/D board. In the WinSDR system settings dialog box select "Local" timing reference type. When this timing mode is selected the A/D board interrogates the computer for the current time of day. I found that the NT port of NTP works very well under Win2K. If you have a DSL line, and can find a good time server that is near by, you can achieve a timing accuracy of around 10 to 20 milliseconds. While searching around I found this Windows port of NTP: http://home.att.net/~Tom.Horsley/ntptime.html Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "tdick" To: Cc: "Kevin Bach" Sent: Wednesday, April 14, 2004 6:52 PM Subject: computer time sync > I am using Dimension 4 to sync the time on the computer that runs only > WinSDR. My time seems to vary. In an event yesterday, St. Louis network and > my computer were 20 seconds off for the same event. Any suggestions? > > > __________________________________________________________ > > 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: computer time sync From: Ian Smith ian@........... Date: Thu, 15 Apr 2004 09:40:19 +0100 for the purposes of our psn uses (plotting quake location etc) what is the error budget for timing?  I've never seen this discussed. 

There must be a fundamental limit caused by the variation in travel times through the earth.  Ie, if the same quake happened twice some thousands of miles away, what would the typical variation in travel time through the earth be?

Another limit will be the algorthms used to calculate the distance from the S and P waves.  Also, the accuracy on our traces with which we place the S and P pointers.  I suspect that this is the largest source of error and may be the equivalent of many many seconds.

Ian Smith

Larry Cochrane wrote:
The time stamping of the data is preformed on the A/D board not on the
computer running WinSDR. If you want very accurate timing, down to a few
milliseconds, you will need to use GPS. The GPS receiver connects up to the
A/D board so it can uses the highly accuracy 1 pulse per second signal
generated by the GPS receiver to time stamp the data. See
http://www.seismicnet.com/gps/index.html for a GPS timing system that will
work with my A/D board.

You can use the computer running WinSDR to supply timing information to the
A/D board. In the WinSDR system settings dialog box select "Local" timing
reference type. When this timing mode is selected the A/D board interrogates
the computer for the current time of day.

I found that the NT port of NTP works very well under Win2K. If you have a
DSL line, and can find a good time server that is near by, you can achieve a
timing accuracy of around 10 to 20 milliseconds. While searching around I
found this Windows port of NTP:
http://home.att.net/~Tom.Horsley/ntptime.html

Larry Cochrane
Redwood City, PSN


----- Original Message ----- 
From: "tdick" <dickthomas01@.............>
To: <psn-l@..............>
Cc: "Kevin Bach" <bachcottage@...........>
Sent: Wednesday, April 14, 2004 6:52 PM
Subject: computer time sync


  
I am using Dimension 4 to sync the time on the computer that runs only
WinSDR. My time seems to vary. In an event yesterday, St. Louis network
    
and
  
my computer were 20 seconds off for the same event. Any suggestions?


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To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
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To leave this list email PSN-L-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
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Subject: RE: 1906 epicenter data From: "Kareem Lanier" kareem@............. Date: Thu, 15 Apr 2004 06:14:36 -0700 gosh. I've searched the USGS website for that professional paper and cannot seem to find it. It's 1515, for sure? Kareem _____ From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Steve Hammond Sent: Wednesday, April 14, 2004 10:14 PM To: psn-l@.............. Subject: RE: 1906 epicenter data Hi Kareem. I'm not aware of any new studies. The USGS Professional Paper 1515, The San Andreas Fault System, Calif., provides the following: 1906/04/18 13:12 UTC 37*24' Lat N. 121*54' Long W. This location is right off the cost near UCSF. Olema is credited with having the peak displacement of 6m measured. Regards, Steve PSN San Jose Aptos, CA [Steve Hammond] Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Wednesday, April 14, 2004 9:22 PM To: psn-l@.............. Subject: RE: 1906 epicenter data Thanks Steve. Do you know if there's been any recent studies done on the precise epicenter of the 1906 event? Olema versus offshore of Daly City. Kareem _____ From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Steve Hammond Sent: Wednesday, April 14, 2004 9:16 PM To: psn-l@.............. Subject: RE: 1906 epicenter data Kereem, hereis a Berkeley Informational site with the info you requested. http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_1906.html Regards, Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Wednesday, April 14, 2004 7:47 PM To: PSN Subject: 1906 epicenter data Does anyone know where I can get the latest information on the 1906 epicenter? Kareem ---------------------------------------------------------------------------- ------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
gosh. I've searched = the USGS=20 website for that professional paper and cannot seem to find it. It's = 1515, for=20 sure?
 
Kareem


From: psn-l-request@................. [mailto:psn-l-request@............... On Behalf Of Steve=20 Hammond
Sent: Wednesday, April 14, 2004 10:14 PM
To: = psn-l@..............
Subject: RE: 1906 epicenter=20 data

Hi=20 Kareem. I'm not aware of any new studies. The USGS Professional Paper = 1515, The=20 San Andreas Fault System, Calif., provides the = following:
1906/04/18 13:12 UTC  37*24' Lat N. 121*54' Long W.  = This=20 location is right off the cost near UCSF. Olema is credited with having = the peak=20 displacement of 6m measured.
Regards, Steve
PSN San = Jose Aptos,=20 CA
[Steve=20 Hammond] 
 Message-----
From:=20 psn-l-request@.............. [mailto:psn-l-request@...............On = Behalf=20 Of Kareem Lanier
Sent: Wednesday, April 14, 2004 9:22=20 PM
To: psn-l@..............
Subject: RE: 1906 = epicenter=20 data

Thanks Steve.=20
 
Do you know if = there's been any=20 recent studies done on the precise epicenter of the 1906 event?=20
Olema versus = offshore of Daly=20 City.
 
Kareem


From: psn-l-request@.............. = [mailto:psn-l-request@............... On Behalf Of Steve=20 Hammond
Sent: Wednesday, April 14, 2004 9:16 = PM
To:=20 psn-l@..............
Subject: RE: 1906 epicenter=20 data

Kereem, hereis a Berkeley Informational site with the info = you=20 requested.
http://www.seismo.berkeley.edu/seismo/hayward/seismicity.hist_190= 6.html
 
Regards, Steve Hammond
PSN=20 San Jose  Aptos, CA
-----Original Message-----
From:=20 psn-l-request@.............. = [mailto:psn-l-request@...............On=20 Behalf Of Kareem Lanier
Sent: Wednesday, April 14, = 2004 7:47=20 PM
To: PSN
Subject: 1906 epicenter=20 data

Does anyone know where I can get the = latest=20 information on the 1906 epicenter?
 
 
Kareem
 
----------------------------------------------------------------= -------------------------------
Kareem's = HeyJooJoo.Com - Discover, Explore, = Learn=20 & Play
 
All of = my outgoing and=20 incoming emails are scanned for viruses and worms by my = antivirus=20 software.
 
Subject: Re: computer time sync From: "tdick" dickthomas01@............. Date: Thu, 15 Apr 2004 08:22:43 -0500 Ian.. I sensed a frustration when trying to talk to Dr. Hermann at the St. = Louis U. network about the location of regional mine blasts. On longer = distant earthquakes -- and most are a long way from the Midwest --like = last night's Jan Mayen Island earthquake --- the arrival of P according = to the tables what happen was off by about 10 seconds--- the computer is = running at 200 Hz -- it may be loading down.
Ian..
I sensed a frustration when trying to = talk to Dr.=20 Hermann at the St. Louis U. network about the location of regional = mine=20 blasts. On longer distant earthquakes -- and most are a long way from = the=20 Midwest --like last night's Jan Mayen Island earthquake --- the arrival of P according to the = tables what=20 happen was off by about 10 seconds--- the computer is = running at=20 200 Hz -- it may be loading down.
Subject: Re: computer time sync From: "Larry Cochrane" lcochrane@.............. Date: Thu, 15 Apr 2004 21:02:22 -0700 Good question. I would say it depends on the type of earthquakes you will be recording. If you only record teleseismic events, then anything under 1/4 of a second is probably overkill. If you record local events, then the timing should be more accurate. The travel-time tables that WinQuake uses can be very accurate. If an agency accurately reports the location and time of a teleseismic event, WinQuake can place the P and S markers to within a few seconds of the actual arrival time of the wave. Now picking the location of the P and especially the S is another story.... Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Ian Smith" To: Sent: Thursday, April 15, 2004 1:40 AM Subject: Re: computer time sync > for the purposes of our psn uses (plotting quake location etc) what is the error budget for timing? I've never seen this discussed. > > There must be a fundamental limit caused by the variation in travel times through the earth. Ie, if the same quake happened twice some thousands of miles away, what would the typical variation in travel time through the earth be? > > Another limit will be the algorthms used to calculate the distance from the S and P waves. Also, the accuracy on our traces with which we place the S and P pointers. I suspect that this is the largest source of error and may be the equivalent of many many seconds. > > Ian Smith __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 1906 epicenter data From: "Connie and Jim Lehman" lehmancj@........... Date: Fri, 16 Apr 2004 07:56:44 -0400 Quake enthusiasts-- The interest in 1906 event never goes away, especially with the = centennial approaching. Olema is mentioned. This is a "must see" site = for anyone --expecially us easterners--seeking the effects of faulting = at the surface. The National Park Service visitor center is just off = Rt. 1 about 20 miles north of Golden Gate Bridge. The excursion getting = there is a scenic adventure in itself.... Jim Lehman
Quake = enthusiasts--
  The interest in 1906 event never = goes away,=20 especially with the centennial  approaching.  Olema is=20 mentioned.  This is a "must see" site for anyone --expecially us=20 easterners--seeking the effects of faulting at the surface.  The = National=20 Park Service visitor center is just off Rt. 1 about 20 miles north of = Golden=20 Gate Bridge.  The excursion getting there is a scenic = adventure in=20 itself....
          =             &= nbsp;           &n= bsp;           =20 Jim Lehman
 
Subject: RE: 1906 epicenter data From: "Kareem Lanier" kareem@............. Date: Fri, 16 Apr 2004 06:14:36 -0700 Yeah, I agree. I've visited the park in the Point Reyes area where you can take the "Earthquake Trail". There, you'll see the offset fence posts and a tree which was split by the strike-slip rupturing. I believe they still hold the concept that the epicenter is around Olema. It seems that the USGS mostly agrees with this but UC Berkeley tends to push for a 1906 epicenter just offshore of Daly City. I cant seem to find any documentation that discusses this to any detail. Kareem _____ From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Connie and Jim Lehman Sent: Friday, April 16, 2004 4:57 AM To: psn-l@.............. Subject: Re: 1906 epicenter data Quake enthusiasts-- The interest in 1906 event never goes away, especially with the centennial approaching. Olema is mentioned. This is a "must see" site for anyone --expecially us easterners--seeking the effects of faulting at the surface. The National Park Service visitor center is just off Rt. 1 about 20 miles north of Golden Gate Bridge. The excursion getting there is a scenic adventure in itself.... Jim Lehman
Yeah, I agree. I've = visited the=20 park in the Point Reyes area where you can take the "Earthquake Trail". = There,=20 you'll see the offset fence posts and a tree which was split by the = strike-slip=20 rupturing. I believe they still hold the concept that the epicenter is = around=20 Olema. It seems that the USGS mostly agrees with this but UC Berkeley = tends to=20 push for a 1906 epicenter just offshore of Daly City. I cant seem to = find any=20 documentation that discusses this to any detail.
 
Kareem


From: psn-l-request@................. [mailto:psn-l-request@............... On Behalf Of Connie and Jim = Lehman
Sent: Friday, April 16, 2004 4:57 AM
To:=20 psn-l@..............
Subject: Re: 1906 epicenter=20 data

Quake = enthusiasts--
  The interest in 1906 event never = goes away,=20 especially with the centennial  approaching.  Olema is=20 mentioned.  This is a "must see" site for anyone --expecially us=20 easterners--seeking the effects of faulting at the surface.  The = National=20 Park Service visitor center is just off Rt. 1 about 20 miles north of = Golden=20 Gate Bridge.  The excursion getting there is a scenic = adventure in=20 itself....
          =             &= nbsp;           &n= bsp;           =20 Jim Lehman
 
Subject: RE: 1906 epicenter data From: "Steve Hammond" shammon1@............. Date: Fri, 16 Apr 2004 10:44:00 -0700 Hi Jim- Hi Kareem, I agree Jim-- The Olema area is worth going to visit. Just don't try to do it on a summer day when the rest of San Francisco is trying to go to the beach like I did. Kereem, you asked about US Geological Survey Professional Paper 1515, The San Andreas Fault System, California (1990) Library of Congress QE606.5.U6S26. This text is actually a 283 page book I purchased from the USGS bookstore in 1991. It details all the fault system and each of the principal earthquakes. Below, please find the text on the 1906 event (page 159-161). There is a discussion in the second part about the work completed to determine the magnitude. There is also a discussion before that on the epicenter location. You will see the USGS references two citations, Bolt, 1968 and Boore, 1977. Keep in mind, Bolt was a Professor at UC Berkeley where he did the research on the location of the 1906 event. I would expect Berkeley to back Bolt's findings. I found it odd that Bolt never publishes his findings in his own books. For example, in Earthquake, Bolt 1978 and in Earthquakes and Geological Discovery (1993) he simply states, "April 18, 1906, early morning in California.... At 5:12 A.M., a few kilometers from the Golden Gate..." Another interesting point, Charles Richter in Elementary Seismology (1958) lists the epicenter location to be 38N 123W 8.3 13:12.0 UTC which is the location of Point Reyes west of the fault system. Regards, Steve Hammond PSN San Jose Aptos, CA APRIL 18, 1906 (M=8V4) The California earthquake of April 18, 1906, ranks as one of the most significant earthquakes of all time. Today, its importance comes more from the wealth of scientific knowledge derived from it than from its sheer size. Rupturing the northernmost 430 km of the San Andreas fault from northwest of San Juan Bautista to the triple junction at Cape Mendocino (fig. 6.6), the earth-quake confounded contemporary geologists with its large, horizontal displacements and great rupture length. Indeed, the significance of the fault and recognition of its large cumulative offset would not be fully appreciated until the advent of plate tectonics more than half a century later. Analysis of the 1906 displacements and strain in the surrounding crust led Reid (1910) to formulate his elastic-rebound theory of the earthquake source, which remains today the principal model of the earthquake cycle. As a basic reference about the earthquake and the damage it caused, geologic observations of the fault rupture and shaking effects, and other consequences of the earthquake, Lawson's (1908) report remains the authoritative work, as well as arguably the most impor-tant study of a single earthquake. In the public's mind, this earthquake is perhaps remembered most for the fire it spawned in San Francisco, giving it the somewhat misleading appellation of the "San Francisco earthquake" (fig. 6.7). Shaking damage, however, was equally severe in many other places along the fault rupture. The frequently quoted value of 700 deaths caused by the earthquake and fire is now believed to underestimate the total loss of life by a factor of 3 or 4. Most of the fatalities occurred in San Francisco, and 189 were reported else-where. At almost precisely 5:12 a.m. local time, a foreshock occurred with sufficient force to be felt widely through-out the San Francisco Bay area. The great earthquake broke loose some 20 to 25 s later, with an epicenter near San Francisco (Bolt, 1968; Boore, 1977). Violent shocks punctuated the strong shaking, which lasted some 45 to 60 s. The earthquake was felt from southern Oregon to south of Los Angeles and inland as far as central Nevada (fig. 6.6). The highest MMI's of VII to IX paralleled the length of the rupture, extending as far as 80 km inland from the fault trace. One important characteristic of the shaking intensity noted in Lawson's (1908) report was the clear correlation of intensity with underlying geologic conditions. Areas situated in sediment-filled valleys sus-tained stronger shaking than nearby bedrock sites, and the strongest shaking occurred in areas where groundreclaimed from San Francisco Bay failed in the earth-quake. Modern seismic-zonation practice accounts for the differences in seismic hazard posed by varying geologic conditions (see Borcherdt, 1975, and Ziony, 1985, for analyses of the San Francisco Bay and Los Angeles regions, respectively). The characteristics and amount of surface fault slip in this earthquake varied to a remarkable degree along the length of the rupture. Peak displacements of 6 m were measured near Olema on the Point Reyes peninsula, where the surface trace of the rupture formed a sharp, well-defined break (fig. 6.8). In contrast, the fault break was extremely difficult to recognize along its southern-most 90 km, where the surface offset averaged only about P/2 m or less (see chap. 7). The magnitude of 8.3 commonly quoted for the 1906 earthquake comes from Richter (1958) and, within the precision of reporting, is identical to the 8V4 listed by Gutenberg and Richter (1954). Table 6.1 also lists other magnitudes for this earthquake, derived from recent analyses of both the same data used by Gutenberg and Richter and new data. Strictly speaking, a "Richter magnitude" (ML) for the earthquake cannot be deter-mined because no appropriate seismographs were in operation at the time. Jennings and Kanamori (1979) used related measurements extracted from simple pendulums at Yountville, Calif., and Carson City, Nev., to derive ML=6.9, substantially smaller than the traditionally quoted value. ML, which is based on the single largest peak on a seismogram at approximately 1-s period and takes into account neither the duration of the event nor longer period motions, is saturated for this event. Geller and Kanamori (1977) used the unpublished worksheets of Gutenberg and Richter to compute a body-wave magnitude of mb=7A, using the procedure of Gutenberg and Richter (1956). Because long-period (14 s) P-waves were used in this calculation, it cannot be directly compared to the short-period mb values routinely reported today. Other workers since Gutenberg and Richter have studied the long-period surface waves of the 1906 earth-quake and computed Ms values. Bolt (1968) confirmed an Ms of about 8V4, whereas Lienkaemper (1984) found Ms= 8.3 from an analysis of all the records collected by Reid (1910). Lienkaemper's magnitude combined data from both damped and undamped instruments, correcting each for magnification at the appropriate period of motion. Abe (1988), who analyzed only the undamped Milne seismograms, obtained Ms= 7.8, using slightly different procedures and a systematic set of station-magnitude corrections. Also, the four damped seismometers (all in Europe) give Ms=8.1. Longer period (50-100 s) surface waves analyzed by Thatcher (1975) indicate a seismic moment of 4xl027 dyne-cm, equivalent to M=7.7, in agreement with the seismic moment of 5xl027 dyne-cm obtained from geodetic data, thus giving M=7.8 (Thatch-er and Lisowski, 1987). Finally, Toppozada and Parke (1982) assigned an intensity magnitude (M/) of 7.8 on the basis of the total area (48,000 km2) undergoing shaking of MMI VII or higher. The "traditional" magnitude of 8V4 is retained here, except where seismic moment is used for quantitative purposes. -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Friday, April 16, 2004 6:15 AM To: psn-l@.............. Subject: RE: 1906 epicenter data Yeah, I agree. I've visited the park in the Point Reyes area where you can take the "Earthquake Trail". There, you'll see the offset fence posts and a tree which was split by the strike-slip rupturing. I believe they still hold the concept that the epicenter is around Olema. It seems that the USGS mostly agrees with this but UC Berkeley tends to push for a 1906 epicenter just offshore of Daly City. I cant seem to find any documentation that discusses this to any detail. Kareem ---------------------------------------------------------------------------- -- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Connie and Jim Lehman Sent: Friday, April 16, 2004 4:57 AM To: psn-l@.............. Subject: Re: 1906 epicenter data Quake enthusiasts-- The interest in 1906 event never goes away, especially with the centennial approaching. Olema is mentioned. This is a "must see" site for anyone --expecially us easterners--seeking the effects of faulting at the surface. The National Park Service visitor center is just off Rt. 1 about 20 miles north of Golden Gate Bridge. The excursion getting there is a scenic adventure in itself.... Jim Lehman
Hi=20 Jim- Hi Kareem,
 I agree Jim-- The Olema area is worth going to = visit. =20 Just don't try to do it on a summer day when the rest of San Francisco = is trying=20 to go to the beach like I did. Kereem, you asked about US Geological = Survey=20 Professional Paper 1515, The San Andreas Fault System, California (1990) = Library=20 of Congress QE606.5.U6S26. This text is actually a 283 page book I = purchased=20 from the USGS bookstore in 1991. It details all the fault = system=20 and each of the principal earthquakes. Below, please find=20 the text on the 1906 event (page 159-161). There is a=20 discussion in the second part about the work completed to = determine the magnitude. There is also a discussion before that on the = epicenter=20 location. You will see the USGS references two citations, Bolt, = 1968 and=20 Boore, 1977.  Keep in mind, Bolt was a Professor at UC Berkeley = where he=20 did the research on the location of the 1906 event. I would = expect=20 Berkeley to back Bolt's findings. I found it odd that Bolt never = publishes=20 his findings in his own books. For example, in Earthquake, Bolt = 1978 and in=20 Earthquakes and Geological Discovery (1993) he simply states, = "April=20 18, 1906, early morning in California.... At 5:12 A.M., a few kilometers = from=20 the Golden Gate..." Another interesting point, Charles Richter in=20 Elementary Seismology (1958) lists the epicenter location to=20 be 38N 123W 8.3 13:12.0 UTC which is the location of Point = Reyes west=20 of the fault system.
Regards, Steve Hammond
PSN=20 San Jose  Aptos, CA    
 

APRIL=20 18, 1906=20 (M=3D8V4)

The California earthquake of = April 18,=20 1906, ranks as one of the most = significant=20 earthquakes of all time. Today, its=20 importance comes more from the wealth of scientific knowledge = derived=20 from it than from its sheer size. = Rupturing=20 the northernmost 430 km of the San Andreas fault from northwest of San = Juan=20 Bautista to the triple junction at Cape Mendocino (fig. 6.6), the = earth­quake confounded = contemporary=20 geologists with its large,=20 horizontal displacements and great rupture length. Indeed, the significance of the fault = and=20 recognition of its large cumulative offset would not be fully = appreciated=20 until the advent of plate = tectonics more=20 than half a century later. Analysis of the 1906 displacements and = strain in the surrounding crust led = Reid (1910)=20 to formulate his = elastic-rebound=20 theory of the earthquake source,=20 which remains today the principal model of the earthquake cycle.

As a = basic=20 reference about the earthquake and the damage it caused, geologic = observations=20 of the fault rupture = and=20 shaking effects, and other consequences of the earthquake, Lawson's = (1908)=20 report remains the authoritative work, as well as = arguably=20 the most impor­tant study of = a single=20 earthquake. In the public's mind, this earthquake is perhaps remembered = most for=20 the fire it spawned in San Francisco, giving it the somewhat = misleading appellation of the "San = Francisco=20 earthquake" (fig. 6.7). = Shaking=20 damage, however, was equally severe in many other places along the fault = rupture. The=20 frequently quoted value of 700 deaths caused by the earthquake and fire is now believed to = underestimate the total = loss of=20 life by a factor of 3 or 4. Most of the fatalities occurred in San Francisco, and 189 were = reported=20 else­where.

At = almost=20 precisely 5:12 a.m. local time, a foreshock occurred with=20 sufficient force to be felt widely through­out the = San=20 Francisco Bay area. The great earthquake broke loose some 20 to 25 s = later, with an=20 epicenter near San Francisco = (Bolt, 1968;=20 Boore, 1977). Violent shocks punctuated the strong shaking, which = lasted some=20 45 to 60 s. The earthquake was felt from southern Oregon to south of Los Angeles and inland as far = as=20 central Nevada (fig. 6.6). The highest MMI's of VII to IX paralleled the = length of the rupture, = extending as=20 far as 80 km inland from the fault trace. One important = characteristic of=20 the shaking intensity noted in = Lawson's=20 (1908) report was the clear correlation of intensity with = underlying=20 geologic conditions. Areas = situated in=20 sediment-filled valleys sus­tained stronger shaking than nearby = bedrock sites,=20 and the strongest shaking = occurred=20 in areas where groundreclaimed from=20 San Francisco Bay failed in the earth­quake. Modern seismic-zonation = practice accounts=20 for the differences in = seismic=20 hazard posed by varying geologic conditions (see Borcherdt, 1975, and = Ziony,=20 1985, for analyses of the = San=20 Francisco Bay and Los Angeles regions, respectively).

The=20 characteristics and amount of surface fault slip in this = earthquake=20 varied to a remarkable degree along the length of the rupture. Peak = displacements=20 of 6 m were measured near Olema on = the Point=20 Reyes peninsula, where the surface trace of the rupture formed a sharp,=20 well-defined break (fig. = 6.8). In=20 contrast, the fault break was extremely difficult to recognize = along its=20 southern­most 90 km, where = the surface=20 offset averaged only about P/2 m or=20 less (see chap. 7).

The = magnitude of=20 8.3 commonly quoted for the 1906 earthquake comes=20 from Richter (1958) and, within the precision of=20 reporting, is identical to the 8V4 listed by Gutenberg and=20 Richter (1954). Table 6.1 also lists other magnitudes for=20 this earthquake, derived from recent analyses of both the same data = used by=20 Gutenberg and Richter and new = data. Strictly=20 speaking, a "Richter magnitude"=20 (ML) for the earthquake cannot be = deter­mined because no appropriate = seismographs were=20 in

operation at the=20 time. Jennings and Kanamori (1979) used related measurements extracted = from simple=20 pendulums at Yountville, Calif., and Carson City, Nev., to derive ML=3D6.9, substantially = smaller than the=20 traditionally quoted value. ML, which is based = on the=20 single largest peak on a seismogram at approximately 1-s period and = takes into account neither the duration = of the=20 event nor longer period = motions, is=20 saturated for this event.

Geller = and=20 Kanamori (1977) used the unpublished worksheets of=20 Gutenberg and Richter to compute a body-wave=20 magnitude of mb=3D7A, using the procedure of = Gutenberg and=20 Richter (1956). Because long-period (14 s) P-waves = were used=20 in this calculation, it cannot be directly = compared=20 to the short-period mb values routinely reported = today.

Other = workers since=20 Gutenberg and Richter have studied = the=20 long-period surface waves of the 1906 earth­quake = and=20 computed Ms values. Bolt (1968) confirmed an = Ms=20 of = about 8V4,=20 whereas Lienkaemper (1984) found Ms=3D 8.3 = from an=20 analysis of all the records collected by Reid (1910). Lienkaemper's magnitude = combined=20 data from both damped and = undamped=20 instruments, correcting each for=20 magnification at the appropriate period of motion. Abe (1988), who analyzed only the = undamped Milne=20 seismograms, obtained Ms=3D 7.8, using slightly = different=20 procedures and a systematic set = of=20 station-magnitude corrections. Also, the four damped seismometers = (all in=20 Europe) give Ms=3D8.1. Longer period (50-100 s) surface waves analyzed by Thatcher (1975) = indicate a=20 seismic moment of 4xl027 dyne-cm, equivalent to = M=3D7.7, in=20 agreement with the seismic = moment of=20 5xl027 dyne-cm obtained from geodetic data, thus giving = M=3D7.8=20 (Thatch­er and Lisowski, 1987). Finally, Toppozada and Parke = (1982) assigned an intensity magnitude = (M/) of=20 7.8 on the basis of the total area (48,000 km2) undergoing = shaking of=20 MMI VII or = higher.

The = "traditional"=20 magnitude of 8V4 is retained here, except where seismic moment is = used for=20 quantitative purposes.

-----Original Message-----
From: = psn-l-request@................. [mailto:psn-l-request@...............On Behalf Of Kareem=20 Lanier
Sent: Friday, April 16, 2004 6:15 AM
To:=20 psn-l@..............
Subject: RE: 1906 epicenter=20 data

Yeah, I agree. = I've visited the=20 park in the Point Reyes area where you can take the "Earthquake = Trail". There,=20 you'll see the offset fence posts and a tree which was split by the=20 strike-slip rupturing. I believe they still hold the concept that the=20 epicenter is around Olema. It seems that the USGS mostly agrees with = this but=20 UC Berkeley tends to push for a 1906 epicenter just offshore of Daly = City. I=20 cant seem to find any documentation that discusses this to any=20 detail.
 
Kareem


From: psn-l-request@.............. = [mailto:psn-l-request@............... On Behalf Of Connie and = Jim=20 Lehman
Sent: Friday, April 16, 2004 4:57 AM
To:=20 psn-l@..............
Subject: Re: 1906 epicenter=20 data

Quake = enthusiasts--
  The interest in 1906 event = never goes=20 away, especially with the centennial  approaching.  Olema is = mentioned.  This is a "must see" site for anyone --expecially us=20 easterners--seeking the effects of faulting at the surface.  The = National=20 Park Service visitor center is just off Rt. 1 about 20 miles north of = Golden=20 Gate Bridge.  The excursion getting there is a scenic = adventure in=20 itself....
          =             &= nbsp;           &n= bsp;           =20 Jim Lehman
 
Subject: RE: 1906 epicenter data From: "Kareem Lanier" kareem@............. Date: Fri, 16 Apr 2004 18:59:36 -0700 Wow, you raised many interesting and intriguing points Steve. Thank you and everyone else very much. I'll see if I can obtain that book from the USGS bookstore. Kind of ominous to think that the epicenter was just southeast of the San Francisco State University. I imagine that things might have been worse if it had been located even further south. Kareem _____ From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Steve Hammond Sent: Friday, April 16, 2004 10:44 AM To: psn-l@.............. Subject: RE: 1906 epicenter data Hi Jim- Hi Kareem, I agree Jim-- The Olema area is worth going to visit. Just don't try to do it on a summer day when the rest of San Francisco is trying to go to the beach like I did. Kereem, you asked about US Geological Survey Professional Paper 1515, The San Andreas Fault System, California (1990) Library of Congress QE606.5.U6S26. This text is actually a 283 page book I purchased from the USGS bookstore in 1991. It details all the fault system and each of the principal earthquakes. Below, please find the text on the 1906 event (page 159-161). There is a discussion in the second part about the work completed to determine the magnitude. There is also a discussion before that on the epicenter location. You will see the USGS references two citations, Bolt, 1968 and Boore, 1977. Keep in mind, Bolt was a Professor at UC Berkeley where he did the research on the location of the 1906 event. I would expect Berkeley to back Bolt's findings. I found it odd that Bolt never publishes his findings in his own books. For example, in Earthquake, Bolt 1978 and in Earthquakes and Geological Discovery (1993) he simply states, "April 18, 1906, early morning in California.... At 5:12 A.M., a few kilometers from the Golden Gate..." Another interesting point, Charles Richter in Elementary Seismology (1958) lists the epicenter location to be 38N 123W 8.3 13:12.0 UTC which is the location of Point Reyes west of the fault system. Regards, Steve Hammond PSN San Jose Aptos, CA APRIL 18, 1906 (M=8V4) The California earthquake of April 18, 1906, ranks as one of the most significant earthquakes of all time. Today, its importance comes more from the wealth of scientific knowledge derived from it than from its sheer size. Rupturing the northernmost 430 km of the San Andreas fault from northwest of San Juan Bautista to the triple junction at Cape Mendocino (fig. 6.6), the earth-quake confounded contemporary geologists with its large, horizontal displacements and great rupture length. Indeed, the significance of the fault and recognition of its large cumulative offset would not be fully appreciated until the advent of plate tectonics more than half a century later. Analysis of the 1906 displacements and strain in the surrounding crust led Reid (1910) to formulate his elastic-rebound theory of the earthquake source, which remains today the principal model of the earthquake cycle. As a basic reference about the earthquake and the damage it caused, geologic observations of the fault rupture and shaking effects, and other consequences of the earthquake, Lawson's (1908) report remains the authoritative work, as well as arguably the most impor-tant study of a single earthquake. In the public's mind, this earthquake is perhaps remembered most for the fire it spawned in San Francisco, giving it the somewhat misleading appellation of the "San Francisco earthquake" (fig. 6.7). Shaking damage, however, was equally severe in many other places along the fault rupture. The frequently quoted value of 700 deaths caused by the earthquake and fire is now believed to underestimate the total loss of life by a factor of 3 or 4. Most of the fatalities occurred in San Francisco, and 189 were reported else-where. At almost precisely 5:12 a.m. local time, a foreshock occurred with sufficient force to be felt widely through-out the San Francisco Bay area. The great earthquake broke loose some 20 to 25 s later, with an epicenter near San Francisco (Bolt, 1968; Boore, 1977). Violent shocks punctuated the strong shaking, which lasted some 45 to 60 s. The earthquake was felt from southern Oregon to south of Los Angeles and inland as far as central Nevada (fig. 6.6). The highest MMI's of VII to IX paralleled the length of the rupture, extending as far as 80 km inland from the fault trace. One important characteristic of the shaking intensity noted in Lawson's (1908) report was the clear correlation of intensity with underlying geologic conditions. Areas situated in sediment-filled valleys sus-tained stronger shaking than nearby bedrock sites, and the strongest shaking occurred in areas where groundreclaimed from San Francisco Bay failed in the earth-quake. Modern seismic-zonation practice accounts for the differences in seismic hazard posed by varying geologic conditions (see Borcherdt, 1975, and Ziony, 1985, for analyses of the San Francisco Bay and Los Angeles regions, respectively). The characteristics and amount of surface fault slip in this earthquake varied to a remarkable degree along the length of the rupture. Peak displacements of 6 m were measured near Olema on the Point Reyes peninsula, where the surface trace of the rupture formed a sharp, well-defined break (fig. 6.8). In contrast, the fault break was extremely difficult to recognize along its southern-most 90 km, where the surface offset averaged only about P/2 m or less (see chap. 7). The magnitude of 8.3 commonly quoted for the 1906 earthquake comes from Richter (1958) and, within the precision of reporting, is identical to the 8V4 listed by Gutenberg and Richter (1954). Table 6.1 also lists other magnitudes for this earthquake, derived from recent analyses of both the same data used by Gutenberg and Richter and new data. Strictly speaking, a "Richter magnitude" (ML) for the earthquake cannot be deter-mined because no appropriate seismographs were in operation at the time. Jennings and Kanamori (1979) used related measurements extracted from simple pendulums at Yountville, Calif., and Carson City, Nev., to derive ML=6.9, substantially smaller than the traditionally quoted value. ML, which is based on the single largest peak on a seismogram at approximately 1-s period and takes into account neither the duration of the event nor longer period motions, is saturated for this event. Geller and Kanamori (1977) used the unpublished worksheets of Gutenberg and Richter to compute a body-wave magnitude of mb=7A, using the procedure of Gutenberg and Richter (1956). Because long-period (14 s) P-waves were used in this calculation, it cannot be directly compared to the short-period mb values routinely reported today. Other workers since Gutenberg and Richter have studied the long-period surface waves of the 1906 earth-quake and computed Ms values. Bolt (1968) confirmed an Ms of about 8V4, whereas Lienkaemper (1984) found Ms= 8.3 from an analysis of all the records collected by Reid (1910). Lienkaemper's magnitude combined data from both damped and undamped instruments, correcting each for magnification at the appropriate period of motion. Abe (1988), who analyzed only the undamped Milne seismograms, obtained Ms= 7.8, using slightly different procedures and a systematic set of station-magnitude corrections. Also, the four damped seismometers (all in Europe) give Ms=8.1. Longer period (50-100 s) surface waves analyzed by Thatcher (1975) indicate a seismic moment of 4xl027 dyne-cm, equivalent to M=7.7, in agreement with the seismic moment of 5xl027 dyne-cm obtained from geodetic data, thus giving M=7.8 (Thatch-er and Lisowski, 1987). Finally, Toppozada and Parke (1982) assigned an intensity magnitude (M/) of 7.8 on the basis of the total area (48,000 km2) undergoing shaking of MMI VII or higher. The "traditional" magnitude of 8V4 is retained here, except where seismic moment is used for quantitative purposes. -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Kareem Lanier Sent: Friday, April 16, 2004 6:15 AM To: psn-l@.............. Subject: RE: 1906 epicenter data Yeah, I agree. I've visited the park in the Point Reyes area where you can take the "Earthquake Trail". There, you'll see the offset fence posts and a tree which was split by the strike-slip rupturing. I believe they still hold the concept that the epicenter is around Olema. It seems that the USGS mostly agrees with this but UC Berkeley tends to push for a 1906 epicenter just offshore of Daly City. I cant seem to find any documentation that discusses this to any detail. Kareem _____ From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Connie and Jim Lehman Sent: Friday, April 16, 2004 4:57 AM To: psn-l@.............. Subject: Re: 1906 epicenter data Quake enthusiasts-- The interest in 1906 event never goes away, especially with the centennial approaching. Olema is mentioned. This is a "must see" site for anyone --expecially us easterners--seeking the effects of faulting at the surface. The National Park Service visitor center is just off Rt. 1 about 20 miles north of Golden Gate Bridge. The excursion getting there is a scenic adventure in itself.... Jim Lehman
Wow, you raised many = interesting=20 and intriguing points Steve. Thank you and everyone else very much. = I'll=20 see if I can obtain that book from the USGS bookstore. =
Kind of ominous to = think that the=20 epicenter was just southeast of the San Francisco State University. I = imagine=20 that things might have been worse if it had been located even further=20 south.
 
Kareem
 


From: psn-l-request@................. [mailto:psn-l-request@............... On Behalf Of Steve=20 Hammond
Sent: Friday, April 16, 2004 10:44 AM
To:=20 psn-l@..............
Subject: RE: 1906 epicenter=20 data

Hi=20 Jim- Hi Kareem,
 I agree Jim-- The Olema area is worth going to = visit. =20 Just don't try to do it on a summer day when the rest of San Francisco = is trying=20 to go to the beach like I did. Kereem, you asked about US Geological = Survey=20 Professional Paper 1515, The San Andreas Fault System, California (1990) = Library=20 of Congress QE606.5.U6S26. This text is actually a 283 page book I = purchased=20 from the USGS bookstore in 1991. It details all the fault = system=20 and each of the principal earthquakes. Below, please find=20 the text on the 1906 event (page 159-161). There is a=20 discussion in the second part about the work completed to = determine the magnitude. There is also a discussion before that on the = epicenter=20 location. You will see the USGS references two citations, Bolt, = 1968 and=20 Boore, 1977.  Keep in mind, Bolt was a Professor at UC Berkeley = where he=20 did the research on the location of the 1906 event. I would = expect=20 Berkeley to back Bolt's findings. I found it odd that Bolt never = publishes=20 his findings in his own books. For example, in Earthquake, Bolt = 1978 and in=20 Earthquakes and Geological Discovery (1993) he simply states, = "April=20 18, 1906, early morning in California.... At 5:12 A.M., a few kilometers = from=20 the Golden Gate..." Another interesting point, Charles Richter in=20 Elementary Seismology (1958) lists the epicenter location to=20 be 38N 123W 8.3 13:12.0 UTC which is the location of Point = Reyes west=20 of the fault system.
Regards, Steve Hammond
PSN=20 San Jose  Aptos, CA    
 

APRIL=20 18, 1906=20 (M=3D8V4)

The California earthquake of = April 18,=20 1906, ranks as one of the most = significant=20 earthquakes of all time. Today, its=20 importance comes more from the wealth of scientific knowledge = derived=20 from it than from its sheer size. = Rupturing=20 the northernmost 430 km of the San Andreas fault from northwest of San = Juan=20 Bautista to the triple junction at Cape Mendocino (fig. 6.6), the = earth­quake confounded = contemporary=20 geologists with its large,=20 horizontal displacements and great rupture length. Indeed, the significance of the fault = and=20 recognition of its large cumulative offset would not be fully = appreciated=20 until the advent of plate = tectonics more=20 than half a century later. Analysis of the 1906 displacements and = strain in the surrounding crust led = Reid (1910)=20 to formulate his = elastic-rebound=20 theory of the earthquake source,=20 which remains today the principal model of the earthquake cycle.

As a = basic=20 reference about the earthquake and the damage it caused, geologic = observations=20 of the fault rupture = and=20 shaking effects, and other consequences of the earthquake, Lawson's = (1908)=20 report remains the authoritative work, as well as = arguably=20 the most impor­tant study of = a single=20 earthquake. In the public's mind, this earthquake is perhaps remembered = most for=20 the fire it spawned in San Francisco, giving it the somewhat = misleading appellation of the "San = Francisco=20 earthquake" (fig. 6.7). = Shaking=20 damage, however, was equally severe in many other places along the fault = rupture. The=20 frequently quoted value of 700 deaths caused by the earthquake and fire is now believed to = underestimate the total = loss of=20 life by a factor of 3 or 4. Most of the fatalities occurred in San Francisco, and 189 were = reported=20 else­where.

At = almost=20 precisely 5:12 a.m. local time, a foreshock occurred with=20 sufficient force to be felt widely through­out the = San=20 Francisco Bay area. The great earthquake broke loose some 20 to 25 s = later, with an=20 epicenter near San Francisco = (Bolt, 1968;=20 Boore, 1977). Violent shocks punctuated the strong shaking, which = lasted some=20 45 to 60 s. The earthquake was felt from southern Oregon to south of Los Angeles and inland as far = as=20 central Nevada (fig. 6.6). The highest MMI's of VII to IX paralleled the = length of the rupture, = extending as=20 far as 80 km inland from the fault trace. One important = characteristic of=20 the shaking intensity noted in = Lawson's=20 (1908) report was the clear correlation of intensity with = underlying=20 geologic conditions. Areas = situated in=20 sediment-filled valleys sus­tained stronger shaking than nearby = bedrock sites,=20 and the strongest shaking = occurred=20 in areas where groundreclaimed from=20 San Francisco Bay failed in the earth­quake. Modern seismic-zonation = practice accounts=20 for the differences in = seismic=20 hazard posed by varying geologic conditions (see Borcherdt, 1975, and = Ziony,=20 1985, for analyses of the = San=20 Francisco Bay and Los Angeles regions, respectively).

The=20 characteristics and amount of surface fault slip in this = earthquake=20 varied to a remarkable degree along the length of the rupture. Peak = displacements=20 of 6 m were measured near Olema on = the Point=20 Reyes peninsula, where the surface trace of the rupture formed a sharp,=20 well-defined break (fig. = 6.8). In=20 contrast, the fault break was extremely difficult to recognize = along its=20 southern­most 90 km, where = the surface=20 offset averaged only about P/2 m or=20 less (see chap. 7).

The = magnitude of=20 8.3 commonly quoted for the 1906 earthquake comes=20 from Richter (1958) and, within the precision of=20 reporting, is identical to the 8V4 listed by Gutenberg and=20 Richter (1954). Table 6.1 also lists other magnitudes for=20 this earthquake, derived from recent analyses of both the same data = used by=20 Gutenberg and Richter and new = data. Strictly=20 speaking, a "Richter magnitude"=20 (ML) for the earthquake cannot be = deter­mined because no appropriate = seismographs were=20 in

operation at the=20 time. Jennings and Kanamori (1979) used related measurements extracted = from simple=20 pendulums at Yountville, Calif., and Carson City, Nev., to derive ML=3D6.9, substantially = smaller than the=20 traditionally quoted value. ML, which is based = on the=20 single largest peak on a seismogram at approximately 1-s period and = takes into account neither the duration = of the=20 event nor longer period = motions, is=20 saturated for this event.

Geller = and=20 Kanamori (1977) used the unpublished worksheets of=20 Gutenberg and Richter to compute a body-wave=20 magnitude of mb=3D7A, using the procedure of = Gutenberg and=20 Richter (1956). Because long-period (14 s) P-waves = were used=20 in this calculation, it cannot be directly = compared=20 to the short-period mb values routinely reported = today.

Other = workers since=20 Gutenberg and Richter have studied = the=20 long-period surface waves of the 1906 earth­quake = and=20 computed Ms values. Bolt (1968) confirmed an = Ms=20 of = about 8V4,=20 whereas Lienkaemper (1984) found Ms=3D 8.3 = from an=20 analysis of all the records collected by Reid (1910). Lienkaemper's magnitude = combined=20 data from both damped and = undamped=20 instruments, correcting each for=20 magnification at the appropriate period of motion. Abe (1988), who analyzed only the = undamped Milne=20 seismograms, obtained Ms=3D 7.8, using slightly = different=20 procedures and a systematic set = of=20 station-magnitude corrections. Also, the four damped seismometers = (all in=20 Europe) give Ms=3D8.1. Longer period (50-100 s) surface waves analyzed by Thatcher (1975) = indicate a=20 seismic moment of 4xl027 dyne-cm, equivalent to = M=3D7.7, in=20 agreement with the seismic = moment of=20 5xl027 dyne-cm obtained from geodetic data, thus giving = M=3D7.8=20 (Thatch­er and Lisowski, 1987). Finally, Toppozada and Parke = (1982) assigned an intensity magnitude = (M/) of=20 7.8 on the basis of the total area (48,000 km2) undergoing = shaking of=20 MMI VII or = higher.

The = "traditional"=20 magnitude of 8V4 is retained here, except where seismic moment is = used for=20 quantitative purposes.

-----Original Message-----
From: = psn-l-request@................. [mailto:psn-l-request@...............On Behalf Of Kareem=20 Lanier
Sent: Friday, April 16, 2004 6:15 AM
To:=20 psn-l@..............
Subject: RE: 1906 epicenter=20 data

Yeah, I agree. = I've visited the=20 park in the Point Reyes area where you can take the "Earthquake = Trail". There,=20 you'll see the offset fence posts and a tree which was split by the=20 strike-slip rupturing. I believe they still hold the concept that the=20 epicenter is around Olema. It seems that the USGS mostly agrees with = this but=20 UC Berkeley tends to push for a 1906 epicenter just offshore of Daly = City. I=20 cant seem to find any documentation that discusses this to any=20 detail.
 
Kareem


From: psn-l-request@.............. = [mailto:psn-l-request@............... On Behalf Of Connie and = Jim=20 Lehman
Sent: Friday, April 16, 2004 4:57 AM
To:=20 psn-l@..............
Subject: Re: 1906 epicenter=20 data

Quake = enthusiasts--
  The interest in 1906 event = never goes=20 away, especially with the centennial  approaching.  Olema is = mentioned.  This is a "must see" site for anyone --expecially us=20 easterners--seeking the effects of faulting at the surface.  The = National=20 Park Service visitor center is just off Rt. 1 about 20 miles north of = Golden=20 Gate Bridge.  The excursion getting there is a scenic = adventure in=20 itself....
          =             &= nbsp;           &n= bsp;           =20 Jim Lehman
 
Subject: ebay auction From: BOB BARNS royb1@........... Date: Sat, 17 Apr 2004 09:52:06 -0400 Hi, gang, Two Seismometer Soltec Quake Graph Recorder Item number: 3810480361 ends 4/23 Looks rather interesting. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: computer time sync From: "Meredith Lamb" meredithlamb@............. Date: Sun, 18 Apr 2004 20:35:10 -0600 Forwarded reply from chrisatupw@........ > [Original Message] > From: > To: tdick > Date: 4/14/2004 8:43:47 PM > Subject: Re: computer time sync > > Hello, > > I also have notice over the last year that that it is harder to get > good time from timeservers. Every little Dlink dsl router (and most other > brands) have time clients and the timeservers in many cases can't > respond in a timely way because of the huge number of request. > > I now have my main computer with a GPS and I send the time with Tardis > to all the computers on my network who listen with K9 it is a bit > better. I am slowly moving to GPS on all systems. > > Consider GPS or WWV > > You also might consider using Righttime software, I would hold your > time much better than 20 seconds. > > I think all station should have good time. > > Angel > > > Thursday, April 15, 2004, 1:52:28 AM, you wrote: > > t> I am using Dimension 4 to sync the time on the computer that runs only > t> WinSDR. My time seems to vary. In an event yesterday, St. Louis network and > t> my computer were 20 seconds off for the same event. Any suggestions? Look up the coverage of WWVB on 60 KHz. You should be able to receive it over much / all of the US. See http://www.boulder.nist.gov/timefreq/stations/wwvb.htm It is certainly available in St. Louis! Oregon Scientific sells 60 KHz radio clocks, which are Quartz crystal but which update hourly. The plain radio alarm clocks are not expensive (US$18?) and are really quite sophisticated devices. They have a little 'aerial' display to indicate when they have updated and display the time to 1 sec. You should get better than 20 milli sec accuracy, probably less than 5 ms error. You can extract a 1 sec signal from an OS clock. 60 KHz is more reliable, if you can use it, than WWV on 2.5, 5, 10 and 15 MHz. WWV can be used with a pll decoder and a digital receiver as described on www.psn.quake.net. You get selective fading on WWV over the various frequencies, which depends on day/ night boundaries and on ionospheric reflection. If you want Radio modules, try contacting the manufacturer on http://www.hkw-elektronik.de/ They also supply the WWVB time decoder modules to read into a computer interface and complete timer subsystems. They don't list a US stockist, but I suspect that there is one or more. The UK receivers are also designed to operate on 60 KHz. My experiments with DCF77 and MSF over europe indicate that the receivers have AMPLE sensitivitiy with their ferrite aerials to over 2000km. Fringe reception can be improved with a long wire Beveridge aerial and a coupling coil. The factors which comonly limit reception are local RF interference, steel mesh fencing and thunderstorms. At ~2000 km range in Seville in southern Spain, the local RF interference prevented good daytime reception, but 20 miles outside town there was no problem. There was no problem in Seville town centre using the stronger night-time signal. There is more info and discussion on http://mariottim.interfree.it/doc07_e.htm. However, I agree that GPS will be more accurate and reliable, always assuming that you can / want to / afford it. Regards, Chris Chapman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: computer time sync From: "Steve Hammond" shammon1@............. Date: Sun, 18 Apr 2004 22:29:05 -0700 I'll add my 2C worth. If you don't have a working GPS receiver Righttime does a good job. Once it has learned the correct error correction value it will hold the time to within a few hundredths of a second / per week. Some time ago, we agreed on the PSN-L list that our clocks margin of error should be under five hundredths of a second. Because I use old AT's and old IBM A/D cards for data collection, I still use a 1993 version of Righttime and Timeset and an IBM 1200 BAUD modem to set the time. I know this sounds out of date however, I find it to be much more accurate than the Internet. Regards, Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Meredith Lamb Sent: Sunday, April 18, 2004 7:35 PM To: psn-l@.............. Cc: chris chapman Subject: Re: computer time sync Forwarded reply from chrisatupw@........ > [Original Message] > From: > To: tdick > Date: 4/14/2004 8:43:47 PM > Subject: Re: computer time sync > > Hello, > > I also have notice over the last year that that it is harder to get > good time from timeservers. Every little Dlink dsl router (and most other > brands) have time clients and the timeservers in many cases can't > respond in a timely way because of the huge number of request. > > I now have my main computer with a GPS and I send the time with Tardis > to all the computers on my network who listen with K9 it is a bit > better. I am slowly moving to GPS on all systems. > > Consider GPS or WWV > > You also might consider using Righttime software, I would hold your > time much better than 20 seconds. > > I think all station should have good time. > > Angel > > > Thursday, April 15, 2004, 1:52:28 AM, you wrote: > > t> I am using Dimension 4 to sync the time on the computer that runs only > t> WinSDR. My time seems to vary. In an event yesterday, St. Louis network and > t> my computer were 20 seconds off for the same event. Any suggestions? Look up the coverage of WWVB on 60 KHz. You should be able to receive it over much / all of the US. See http://www.boulder.nist.gov/timefreq/stations/wwvb.htm It is certainly available in St. Louis! Oregon Scientific sells 60 KHz radio clocks, which are Quartz crystal but which update hourly. The plain radio alarm clocks are not expensive (US$18?) and are really quite sophisticated devices. They have a little 'aerial' display to indicate when they have updated and display the time to 1 sec. You should get better than 20 milli sec accuracy, probably less than 5 ms error. You can extract a 1 sec signal from an OS clock. 60 KHz is more reliable, if you can use it, than WWV on 2.5, 5, 10 and 15 MHz. WWV can be used with a pll decoder and a digital receiver as described on www.psn.quake.net. You get selective fading on WWV over the various frequencies, which depends on day/ night boundaries and on ionospheric reflection. If you want Radio modules, try contacting the manufacturer on http://www.hkw-elektronik.de/ They also supply the WWVB time decoder modules to read into a computer interface and complete timer subsystems. They don't list a US stockist, but I suspect that there is one or more. The UK receivers are also designed to operate on 60 KHz. My experiments with DCF77 and MSF over europe indicate that the receivers have AMPLE sensitivitiy with their ferrite aerials to over 2000km. Fringe reception can be improved with a long wire Beveridge aerial and a coupling coil. The factors which comonly limit reception are local RF interference, steel mesh fencing and thunderstorms. At ~2000 km range in Seville in southern Spain, the local RF interference prevented good daytime reception, but 20 miles outside town there was no problem. There was no problem in Seville town centre using the stronger night-time signal. There is more info and discussion on http://mariottim.interfree.it/doc07_e.htm. However, I agree that GPS will be more accurate and reliable, always assuming that you can / want to / afford it. Regards, Chris Chapman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Site on Infrasound + Seismic detection From: Arie Verveer greensky@............ Date: Mon, 19 Apr 2004 20:43:50 +0800 Hi all, this site has some interesting information on Infrasound detectors and seismic signal detection. http://geology.heroy.smu.edu/~hayward/ The text format of this page is a little confused, but the documents can still be downloaded. Its Worth the download and read. Arie At the moment i'm slowly rebuilding my Infrasound equipment and found this info very informative. I hope to have my site displaying seismic and Infrasound drum recordings around august. I have an interest in infrasound detection of meteors (fireballs). On one occasion I recorded a sonic boom for a very bright fireball with the seismograph (1 Hz). __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Mon, 19 Apr 2004 10:05:41 -0700 (PDT) Since there is power in my attic, I want to install my GPS receiver near the roof vent at the end of the house and run the cable down to Larry's A/D. The distance is about 100 feet and I think that is too far for RS232. I have read where RS485 is useful for this issue. Any suggestions would be appreciated. Thank you. Richard Gagnon __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: apsn apsn@........... Date: Mon, 19 Apr 2004 09:14:22 -0800 Richard, I have successfully run RS-232C cables of 100 feet in length. I might also= =20 suggest you consider a RS-232C extender (which uses CAT5 cable between two converter= boxes) such as that offered by Minicom: http://www.minicom.com/kvm_232.htm There are others available as well: http://www.ramelectronics.net/html/EXT-RS232.htm What others have done is to extend the GPS antenna coax rather than the=20 RS-232 cable and put the receiver next to the A/D. Hope this helps, Bob http://apsn.awcable.com At 09:05 AM 4/19/2004, you wrote: >Since there is power in my attic, I want to install my GPS receiver near= the >roof vent at the end of the house and run the cable down to Larry's A/D.= The >distance is about 100 feet and I think that is too far for RS232. I have= read >where RS485 is useful for this issue. Any suggestions would be appreciated. >Thank you. > >Richard Gagnon > > > > >__________________________________ >Do you Yahoo!? >Yahoo! Photos: High-quality 4x6 digital prints for 25=A2 >http://photos.yahoo.com/ph/print_splash >__________________________________________________________ > >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: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Mon, 19 Apr 2004 10:26:13 -0700 (PDT) Thank you Bob. I will probably try your first suggestion. I had thought of extending the antenna lead in but the RG174 going up to the antenna is kind of fragile for extended roof lead in. A lot of branches, leaves and pine needles land on my roof since the oak and some pine trees are about 20 feet from the house and some trees lean in the direction of the house. The house is south of the trees so the trees, the past 30 years have leaned in that direction. About once a year I get up on the roof and clean "house". Cheers Richard --- apsn wrote: > Richard, > > I have successfully run RS-232C cables of 100 feet in length. I might also > suggest you > consider a RS-232C extender (which uses CAT5 cable between two converter > boxes) > such as that offered by Minicom: http://www.minicom.com/kvm_232.htm > There are others available as well: > http://www.ramelectronics.net/html/EXT-RS232.htm > > What others have done is to extend the GPS antenna coax rather than the > RS-232 cable and put the receiver next to the A/D. > > Hope this helps, > > Bob > http://apsn.awcable.com > > > At 09:05 AM 4/19/2004, you wrote: > >Since there is power in my attic, I want to install my GPS receiver near the > >roof vent at the end of the house and run the cable down to Larry's A/D. The > >distance is about 100 feet and I think that is too far for RS232. I have > read > >where RS485 is useful for this issue. Any suggestions would be appreciated. > >Thank you. > > > >Richard Gagnon > > > > > > > > > >__________________________________ > >Do you Yahoo!? > >Yahoo! Photos: High-quality 4x6 digital prints for 25¢ > >http://photos.yahoo.com/ph/print_splash > >__________________________________________________________ > > > >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. __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: Ian Smith ian@........... Date: Mon, 19 Apr 2004 18:31:54 +0100 How far you can run an rs232 cable is dependant on the speed that you need to run the link (amongst others too). GPS receivers tend to be run at 4800 or 9600 baud. This is fairly modest so I would be optimistic that it would work over 100 feet, even without an extender. Worth a try. Ian Smith apsn wrote: > Richard, > > I have successfully run RS-232C cables of 100 feet in length. I might > also suggest you > consider a RS-232C extender (which uses CAT5 cable between two > converter boxes) > such as that offered by Minicom: http://www.minicom.com/kvm_232.htm > There are others available as well: > http://www.ramelectronics.net/html/EXT-RS232.htm > > What others have done is to extend the GPS antenna coax rather than > the RS-232 cable and put the receiver next to the A/D. > > Hope this helps, > > Bob > http://apsn.awcable.com > > > At 09:05 AM 4/19/2004, you wrote: > >> Since there is power in my attic, I want to install my GPS receiver >> near the >> roof vent at the end of the house and run the cable down to Larry's >> A/D. The >> distance is about 100 feet and I think that is too far for RS232. I >> have read >> where RS485 is useful for this issue. Any suggestions would be >> appreciated. >> Thank you. >> >> Richard Gagnon >> >> >> >> >> __________________________________ >> Do you Yahoo!? >> Yahoo! Photos: High-quality 4x6 digital prints for 25¢ >> http://photos.yahoo.com/ph/print_splash >> __________________________________________________________ >> >> 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: Re: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Mon, 19 Apr 2004 10:34:14 -0700 (PDT) Hello Ian Thank you for the reinforcement. I have been thinking along that line. Richard --- Ian Smith wrote: > How far you can run an rs232 cable is dependant on the speed that you > need to run the link (amongst others too). GPS receivers tend to be run > at 4800 or 9600 baud. This is fairly modest so I would be optimistic > that it would work over 100 feet, even without an extender. Worth a try. > > Ian Smith > > apsn wrote: > > > Richard, > > > > I have successfully run RS-232C cables of 100 feet in length. I might > > also suggest you > > consider a RS-232C extender (which uses CAT5 cable between two > > converter boxes) > > such as that offered by Minicom: http://www.minicom.com/kvm_232.htm > > There are others available as well: > > http://www.ramelectronics.net/html/EXT-RS232.htm > > > > What others have done is to extend the GPS antenna coax rather than > > the RS-232 cable and put the receiver next to the A/D. > > > > Hope this helps, > > > > Bob > > http://apsn.awcable.com > > > > > > At 09:05 AM 4/19/2004, you wrote: > > > >> Since there is power in my attic, I want to install my GPS receiver > >> near the > >> roof vent at the end of the house and run the cable down to Larry's > >> A/D. The > >> distance is about 100 feet and I think that is too far for RS232. I > >> have read > >> where RS485 is useful for this issue. Any suggestions would be > >> appreciated. > >> Thank you. > >> > >> Richard Gagnon > >> > >> > >> > >> > >> __________________________________ > >> Do you Yahoo!? > >> Yahoo! Photos: High-quality 4x6 digital prints for 25¢ > >> http://photos.yahoo.com/ph/print_splash > >> __________________________________________________________ > >> > >> 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) > > 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. __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: apsn apsn@........... Date: Mon, 19 Apr 2004 09:48:53 -0800 Richard, Here's a very good reference for RS-232C: http://www.arcelect.com/rs232.htm Bob http://apsn.awcable.com At 09:05 AM 4/19/2004, you wrote: >Since there is power in my attic, I want to install my GPS receiver near= the >roof vent at the end of the house and run the cable down to Larry's A/D.= The >distance is about 100 feet and I think that is too far for RS232. I have= read >where RS485 is useful for this issue. Any suggestions would be appreciated. >Thank you. > >Richard Gagnon > > > > >__________________________________ >Do you Yahoo!? >Yahoo! Photos: High-quality 4x6 digital prints for 25=A2 >http://photos.yahoo.com/ph/print_splash >__________________________________________________________ > >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: ebay auction From: Jack Ivey ivey@.......... Date: Mon, 19 Apr 2004 14:27:50 -0400 Does anyone know what the Teledyne SD-17 is? Jack -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of BOB BARNS Sent: Saturday, April 17, 2004 9:52 AM To: psn mail Subject: ebay auction Hi, gang, Two Seismometer Soltec Quake Graph Recorder Item number: 3810480361 ends 4/23 Looks rather interesting. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: "Larry Cochrane" lcochrane@.............. Date: Tue, 20 Apr 2004 00:33:26 -0700 Richard, My A/D board requires three signal lines to/from the GPS receiver. If you make up a RS232 cable, make sure connect up the 1 pps signal (pin 1) as well as the transmitter, receiver and ground lines. Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Richard Gagnon" To: Sent: Monday, April 19, 2004 10:05 AM Subject: GPS serial connection > Since there is power in my attic, I want to install my GPS receiver near the > roof vent at the end of the house and run the cable down to Larry's A/D. The > distance is about 100 feet and I think that is too far for RS232. I have read > where RS485 is useful for this issue. Any suggestions would be appreciated. > Thank you. > > Richard Gagnon __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Tue, 20 Apr 2004 08:51:38 -0700 (PDT) Hi Larry Thank you for the reminder about the 1pps signal. I had forgotten about it. What do you think of driving rs232 and the 1pps a distance of about 70 feet? There are some tall slender oaks trees which partially lean over the house roof and can partially block satellites at times which is why I want my gps receiver mounted near the roof peak, just inside the roof vent. It is easily accessed through a stairway in my garage. Also I am in the northern latitude, actually, N 42 degrees 14 minutes 11.628 seconds W 72 degrees 41 minutes 00.628 seconds I have a used receiver and used antenna I bought from you a couple of years ago. I think the antenna lead is about 10 to 12 feet long. Could I do this with cat 5 or would you recommend twisted pair? I am looking for suggestions. I know you must be busy so take your time as I work a lot of overtime so I am not in a rush. Thank you. Richard --- Larry Cochrane wrote: > Richard, > > My A/D board requires three signal lines to/from the GPS receiver. If you > make up a RS232 cable, make sure connect up the 1 pps signal (pin 1) as well > as the transmitter, receiver and ground lines. > > Larry Cochrane > Redwood City, PSN > > ----- Original Message ----- > From: "Richard Gagnon" > To: > Sent: Monday, April 19, 2004 10:05 AM > Subject: GPS serial connection > > > > Since there is power in my attic, I want to install my GPS receiver near > the > > roof vent at the end of the house and run the cable down to Larry's A/D. > The > > distance is about 100 feet and I think that is too far for RS232. I have > read > > where RS485 is useful for this issue. Any suggestions would be > appreciated. > > Thank you. > > > > Richard Gagnon > > __________________________________________________________ > > 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. __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: Mark Robinson mark.robinson@............... Date: Wed, 21 Apr 2004 08:15:59 +1200 > What do you think of driving rs232 and the 1pps a distance of about 70 feet? Hi Richard, I've seen RS-232 successfully sent hundreads of metres between large office buildings. There were occaisonal problems with voltage differentials between the buildings, but I can't see this causing you any problem. regards Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: apsn@........... Date: Tue, 20 Apr 2004 13:08:19 -0800 (AKDT) Richard, My GPS antenna, similar to what Larry sells and hooked to a Motorola Oncore GT+ receiver, can only see the western 1/4 of the sky through 60-foot tall trees. I routinely get 4+ satellites even during the green season, rain, snow, etc. Plus, I have a 7200v power line about 100 feet from the antenna. Timing accuracy has never been a problem for me in this environment. Just an FYI, Bob Hammond Public Seismic Network - Alaska http://apsn.awcable.com > Hi Larry > > Thank you for the reminder about the 1pps signal. I had forgotten about > it. What do you think of driving rs232 and the 1pps a distance of about > 70 feet? There are some tall slender oaks trees which partially lean > over the house roof and can partially block satellites at times which is > why I want my gps receiver mounted near the roof peak, just inside the > roof vent. It is easily accessed through a stairway in my garage. Also I > am in the northern latitude, actually, N 42 degrees 14 minutes 11.628 > seconds > W 72 degrees 41 minutes 00.628 seconds > I have a used receiver and used antenna I bought from you a couple of > years ago. I think the antenna lead is about 10 to 12 feet long. Could I > do this with cat 5 or would you recommend twisted pair? I am looking for > suggestions. I know you must be busy so take your time as I work a lot > of overtime so I am not in a rush. Thank you. > > Richard > > > > > > > > > --- Larry Cochrane wrote: >> Richard, >> >> My A/D board requires three signal lines to/from the GPS receiver. If >> you make up a RS232 cable, make sure connect up the 1 pps signal (pin >> 1) as well as the transmitter, receiver and ground lines. >> >> Larry Cochrane >> Redwood City, PSN >> >> ----- Original Message ----- >> From: "Richard Gagnon" >> To: >> Sent: Monday, April 19, 2004 10:05 AM >> Subject: GPS serial connection >> >> >> > Since there is power in my attic, I want to install my GPS receiver >> near >> the >> > roof vent at the end of the house and run the cable down to Larry's >> A/D. >> The >> > distance is about 100 feet and I think that is too far for RS232. I >> have >> read >> > where RS485 is useful for this issue. Any suggestions would be >> appreciated. >> > Thank you. >> > >> > Richard Gagnon >> >> __________________________________________________________ >> >> 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. > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Photos: High-quality 4x6 digital prints for 25¢ > http://photos.yahoo.com/ph/print_splash > __________________________________________________________ > > 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: GPS serial connection From: "Mike Lozano" mikel@............... Date: Tue, 20 Apr 2004 19:27:59 -0500 Hey y'all, In reference to wanting to drive an RS-232 signal for a long way. A few years ago, I purchased a protocol converter for just such a purpose. I was sending an RS-232 signal for a thousand feet, or so. The project ended, and I found out I had one more converter than I needed. I don't need it now, and it's just gathering dust in my shop. I think I paid about one hundred and fifty bucks for it. If anyone needs such a critter, I'd be open to any reasonable offer - spell that cheap! Cheers, Mike Lozano, Applied Sciences, Ltd. -0- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: GPS serial connection - Part 2 (Oops!) From: "Mike Lozano" mikel@............... Date: Tue, 20 Apr 2004 19:33:15 -0500 Folks, I forgot to mention that the protocol converter I have converts RS-232 to RS-422 and RS-485. If there's any interest, please contact me. Regards, Mike Lozano -0- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: "Larry Cochrane" lcochrane@.............. Date: Tue, 20 Apr 2004 22:33:06 -0700 Hi Richard, > Hi Larry > > Thank you for the reminder about the 1pps signal. I had forgotten about it. > What do you think of driving rs232 and the 1pps a distance of about 70 feet? It should work fine. I've tried 50 feet without any problems. > There are some tall slender oaks trees which partially lean over the house roof > and can partially block satellites at times which is why I want my gps receiver > mounted near the roof peak, just inside the roof vent. It is easily accessed > through a stairway in my garage. Also I am in the northern latitude, actually, > N 42 degrees 14 minutes 11.628 seconds > W 72 degrees 41 minutes 00.628 seconds After the receiver is locked, it only takes 2 or more satellites to keep accurate time. I find that I can place the antenna just about any place inside my house and still have enough signal for good time keeping. I have a single story house with a wood roof. > I have a used receiver and used antenna I bought from you a couple of years > ago. I think the antenna lead is about 10 to 12 feet long. Could I do this with > cat 5 or would you recommend twisted pair? I am looking for suggestions. I know > you must be busy so take your time as I work a lot of overtime so I am not in a > rush. Thank you. You can't extend the antenna with cat 5, you need to use a good quality low loss 50 ohm coax wire between the antenna and the receive. Cat 5 may work without some sort of converter for the RS-232 input/outputs. Give it a try and let us know how it works out. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: "James Hannon" jmhannon@......... Date: Wed, 21 Apr 2004 08:08:27 -0500 Cat 5 would make excellent wire for the RS-232 signals. Especially if one wire of each twisted pair is grounded and the other used for a signal. Jim Hannon ---------- Original Message ---------------------------------- From: "Larry Cochrane" Reply-To: psn-l@.............. Date: Tue, 20 Apr 2004 22:33:06 -0700 > >You can't extend the antenna with cat 5, you need to use a good quality low >loss 50 ohm coax wire between the antenna and the receive. Cat 5 may work >without some sort of converter for the RS-232 input/outputs. Give it a try >and let us know how it works out. > >-Larry Cochrane >Redwood City, PSN > > > -- Jim Hannon http://www.fmtcs.com/web/jmhannon/ 42,11.90N,91,39.26W WB0TXL -- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Wed, 21 Apr 2004 07:17:33 -0700 (PDT) Hi Larry & group I did not mean cat5 for the antenna, only for rs232 and 1pps.. I guess I was not clear on that. The system works fine and thank you for the follow up on the satellite reqirements. I thought I would need at least four sattelites. Richard --- Larry Cochrane wrote: > Richard, > > My A/D board requires three signal lines to/from the GPS receiver. If you > make up a RS232 cable, make sure connect up the 1 pps signal (pin 1) as well > as the transmitter, receiver and ground lines. > > Larry Cochrane > Redwood City, PSN > > ----- Original Message ----- > From: "Richard Gagnon" > To: > Sent: Monday, April 19, 2004 10:05 AM > Subject: GPS serial connection > > > > Since there is power in my attic, I want to install my GPS receiver near > the > > roof vent at the end of the house and run the cable down to Larry's A/D. > The > > distance is about 100 feet and I think that is too far for RS232. I have > read > > where RS485 is useful for this issue. Any suggestions would be > appreciated. > > Thank you. > > > > Richard Gagnon > > __________________________________________________________ > > 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. __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: apsn apsn@........... Date: Wed, 21 Apr 2004 07:26:58 -0800 Richard, You only need 4 satellites for 3-D positioning. Accurate time can be had=20 by 1-2 satellites if I remember right. Bob http://apsn.awcable.com At 06:17 AM 4/21/2004, you wrote: >Hi Larry & group > >I did not mean cat5 for the antenna, only for rs232 and 1pps.. I guess I= was >not clear on that. The system works fine and thank you for the follow up=20 >on the >satellite reqirements. I thought I would need at least four sattelites. > >Richard > > > >--- Larry Cochrane wrote: > > Richard, > > > > My A/D board requires three signal lines to/from the GPS receiver. If= you > > make up a RS232 cable, make sure connect up the 1 pps signal (pin 1) as= =20 > well > > as the transmitter, receiver and ground lines. > > > > Larry Cochrane > > Redwood City, PSN > > > > ----- Original Message ----- > > From: "Richard Gagnon" > > To: > > Sent: Monday, April 19, 2004 10:05 AM > > Subject: GPS serial connection > > > > > > > Since there is power in my attic, I want to install my GPS receiver= near > > the > > > roof vent at the end of the house and run the cable down to Larry's= A/D. > > The > > > distance is about 100 feet and I think that is too far for RS232. I= have > > read > > > where RS485 is useful for this issue. Any suggestions would be > > appreciated. > > > Thank you. > > > > > > Richard Gagnon > > > > __________________________________________________________ > > > > 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. > > > > > >__________________________________ >Do you Yahoo!? >Yahoo! Photos: High-quality 4x6 digital prints for 25=A2 >http://photos.yahoo.com/ph/print_splash >__________________________________________________________ > >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: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Wed, 21 Apr 2004 09:02:30 -0700 (PDT) Thank you all for the help. Richard --- apsn wrote: > Richard, > > You only need 4 satellites for 3-D positioning. Accurate time can be had > by 1-2 satellites if I remember right. > > Bob > http://apsn.awcable.com > > > At 06:17 AM 4/21/2004, you wrote: > >Hi Larry & group > > > >I did not mean cat5 for the antenna, only for rs232 and 1pps.. I guess I was > >not clear on that. The system works fine and thank you for the follow up > >on the > >satellite reqirements. I thought I would need at least four sattelites. > > > >Richard > > > > > > > >--- Larry Cochrane wrote: > > > Richard, > > > > > > My A/D board requires three signal lines to/from the GPS receiver. If you > > > make up a RS232 cable, make sure connect up the 1 pps signal (pin 1) as > > well > > > as the transmitter, receiver and ground lines. > > > > > > Larry Cochrane > > > Redwood City, PSN > > > > > > ----- Original Message ----- > > > From: "Richard Gagnon" > > > To: > > > Sent: Monday, April 19, 2004 10:05 AM > > > Subject: GPS serial connection > > > > > > > > > > Since there is power in my attic, I want to install my GPS receiver > near > > > the > > > > roof vent at the end of the house and run the cable down to Larry's > A/D. > > > The > > > > distance is about 100 feet and I think that is too far for RS232. I > have > > > read > > > > where RS485 is useful for this issue. Any suggestions would be > > > appreciated. > > > > Thank you. > > > > > > > > Richard Gagnon > > > > > > __________________________________________________________ > > > > > > 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. > > > > > > > > > > > >__________________________________ > >Do you Yahoo!? > >Yahoo! Photos: High-quality 4x6 digital prints for 25¢ > >http://photos.yahoo.com/ph/print_splash > >__________________________________________________________ > > > >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. __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: "Meredith Lamb" meredithlamb@............. Date: Wed, 21 Apr 2004 15:55:59 -0600 The below is a forwarded AOL email from Chris Chapman Hi Richard and everyone, Following Bob's good advice, if you go to http://www.arcelect.com/technica.htm you will find specs for RS232, RS422, RS423, RS485, several other standards, cable pin connections, trouble shooting software, other reference website links and even lightning protection advice. I suggest they you 'Bookmark' this extensive technical information source for future reference. Getting back to cable runs, RS232 is nominally recommeded for up to 50 ft., although in favorable circumstances this can be extended. RS422/RS423 nominally operate up to 4,000 feet. For RS232, there are a number of substandards with differing voltage lines, switch levels and deadband around zero volts. Long exposed cable runs often do need lighning protection / surge protection / opto isolation. Regards, Chris Chapman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Any suggestions? From: "tdick" dickthomas01@............. Date: Mon, 26 Apr 2004 12:18:36 -0500 Does anyone know of a way/program that takes the WinSDR screen display and puts into to a web page? I am not talking about the stored GIF and HTML file which I am uploading to a web page -- I want the current screen view. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Any suggestions? From: "P. Beenders" piet.beenders@......... Date: Mon, 26 Apr 2004 19:23:35 +0200 I make a simple screen dump of it, clip it to the correct size and convert it to jpg as you can see on www.peut.net under registered quake's. Not all are screen-dumps, but most are. ----- Original Message ----- From: "tdick" To: Sent: Monday, April 26, 2004 7:18 PM Subject: Any suggestions? > Does anyone know of a way/program that takes the WinSDR screen display and > puts into to a web page? I am not talking about the stored GIF and HTML file > which I am uploading to a web page -- I want the current screen view. > > > __________________________________________________________ > > 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: Any suggestions? From: "Steve Hammond" shammon1@............. Date: Mon, 26 Apr 2004 12:04:42 -0700 For a simple screen capture program I really like Grabit Pro found on the Web. It's about $35 to register it and the guy that developed it will send you the key via email and mail you a copy. I use it all the time for all kinds of applications. Excellent Rating. For event file take a look at the reports HTML files generated by "Recent" by ajbv@............ sorry, I don't have a name, but I think he is a member of this list. See the reports I generated and put up on my web site at http://pw2.netcom.com/~shammon1/recent.htm I have a copy of the original zip file and will email it to you if you send me a note off-line. Make sure you put PSN RECENT: in the subject line to catch my attention. Recent has a number of options so you should take a look at the documentation to see if it will do what you need. Regards, Steve Hammond PSN San Jose -- Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of P. Beenders Sent: Monday, April 26, 2004 10:24 AM To: psn-l@.............. Subject: Re: Any suggestions? I make a simple screen dump of it, clip it to the correct size and convert it to jpg as you can see on www.peut.net under registered quake's. Not all are screen-dumps, but most are. ----- Original Message ----- From: "tdick" To: Sent: Monday, April 26, 2004 7:18 PM Subject: Any suggestions? > Does anyone know of a way/program that takes the WinSDR screen display and > puts into to a web page? I am not talking about the stored GIF and HTML file > which I am uploading to a web page -- I want the current screen view. > > > __________________________________________________________ > > 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: Re: Any suggestions? From: Tobin Fricke tobin@.......... Date: Mon, 26 Apr 2004 12:08:02 -0700 Steve Hammond wrote: >For a simple screen capture program I really like Grabit Pro found on the >Web. It's about $35 to register it and the guy that developed it will send >you the key via email and mail you a copy. I use it all the time for all >kinds of applications. Excellent Rating. > > If you're just taking screen shots, there are plenty of free programs that will do it. (The basic screen shot functionality is already in Windows, IIRC -- Alt-PrintScreen or somesuch key combination will copy the current display image to the clipboard). One such program is The Gimp (http://www.gimp.org/), a completely free application that tries to do everything that Photoshop can do. Notably it allows you to take screen shots of the entire screen or only of a single window, and it is scriptable. Tobin __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Any suggestions? From: Thomas W Leiper twleiper@........ Date: Mon, 26 Apr 2004 18:59:40 -0400 On Mon, 26 Apr 2004 12:18:36 -0500 "tdick" writes: > Does anyone know of a way/program that takes the WinSDR screen > display and > puts into to a web page? I am not talking about the stored GIF and > HTML file > which I am uploading to a web page -- I want the current screen > view. Hit "PrtSc", then fire up Paint Shop Pro or Word and "edit>paste" the screen-shot image from the clipboard into the document or image. Tom __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Clarification -- I want this to occur automatically so I can access it while I am away from home. From: "tdick" dickthomas01@............. Date: Mon, 26 Apr 2004 20:10:30 -0500 > > Does anyone know of a way/program that takes the WinSDR screen > > display and > > puts into to a web page? I am NOT talking about the stored GIF and > > HTML file > > which I am uploading to a web page -- I want the current screen > > view. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Clarification -- I want this to occur automatically so I can From: "Daniel" dhindry@............... Date: Tue, 27 Apr 2004 14:25:08 +1200 Hi, I think this is what you are after. I have implemented this on my site and find it really useful. http://k1ten3.no-ip.com/capture.htm The image is set to update every 10 seconds, and the webpage html code also tells the page to reload every 10 seconds. This can be changed to how ever you like it. The program I use that captures the screen is called Snagit from Http://techsmith.com It allows you to set up captures and put the file anywhere you like, including sending it via ftp etc. If your computer is also your html server then any capture program will do. As long as it does automatic timed captures. Then you just have to call up the image file using html in a page like I have. Daniel Hindry __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Clarification -- I want this to occur automatically so I From: apsn apsn@........... Date: Mon, 26 Apr 2004 18:35:09 -0800 Have you considered using remote control software such as VNC, SecureVNC, or Dameware's product or access your WinSDR via the web? I've used a secure version of VNC very successfully to remote control PC's across the web. VNC: http://www.realvnc.com/ and https://3sp.com/catalog/products/sshtools/sshterm_pro/help/svnc-complete.htm. Dameware Remote Control: http://www.dameware.com/products/ Bob At 05:10 PM 4/26/2004, you wrote: > > > Does anyone know of a way/program that takes the WinSDR screen > > > display and > > > puts into to a web page? I am NOT talking about the stored GIF and > > > HTML file > > > which I am uploading to a web page -- I want the current screen > > > view. > > >__________________________________________________________ > >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: Clarification -- I want this to occur automatically so I can access it while I am away from home. From: sismos@.............. Date: Tue, 27 Apr 2004 02:46:44 +0000 Hello tdick, Why not install VNC or PC Anywhere and just look at the computer's screen directly from where you happen to be. You can take a look at one of my loggers a Tuesday, April 27, 2004, 1:10:30 AM, you wrote: >> > Does anyone know of a way/program that takes the WinSDR screen >> > display and >> > puts into to a web page? I am NOT talking about the stored GIF and >> > HTML file >> > which I am uploading to a web page -- I want the current screen >> > view. t> __________________________________________________________ t> Public Seismic Network Mailing List (PSN-L) t> To leave this list email PSN-L-REQUEST@.............. with t> the body of the message (first line only): unsubscribe t> See http://www.seismicnet.com/maillist.html for more information. -- Best regards, sismos mailto:sismos@.............. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Clarification -- I want this to occur automatically so I can access it while I am away from home. From: sismos@.............. Date: Tue, 27 Apr 2004 02:47:58 +0000 Hello tdick, Why not install VNC or PC Anywhere and just look at the computer's screen directly from where you happen to be. You can take a look at one of my loggers aT http://64.116.183.137:5800 The password is "sismos" Is this what you want to do? angel Tuesday, April 27, 2004, 1:10:30 AM, you wrote: >> > Does anyone know of a way/program that takes the WinSDR screen >> > display and >> > puts into to a web page? I am NOT talking about the stored GIF and >> > HTML file >> > which I am uploading to a web page -- I want the current screen >> > view. t> __________________________________________________________ t> Public Seismic Network Mailing List (PSN-L) t> To leave this list email PSN-L-REQUEST@.............. with t> the body of the message (first line only): unsubscribe t> See http://www.seismicnet.com/maillist.html for more information. -- Best regards, sismos mailto:sismos@.............. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: GPS serial connection From: Richard Gagnon richg_1998@......... Date: Wed, 28 Apr 2004 06:31:34 -0700 (PDT) Hello all I have installed the gps oncore 8 channel receiver in my attic next to a roof vent and used 70 feet (21 m) 4 wire shielded cable to connect to the computer. The antenna is on the roof and attached with rtv. Everything works very well. I used winoncore12 to check out the setup and then switched to winplotgps which I will use with Larry's A/D. I can receive 10 satellites but the receiver only uses 8 which is more than enough. At the original location the antenna was some what shielded because the antenna was at the eaves of the house but on the north side of the house and only two to three satellites could be effectively seen. I found a cast off UPS-200, APC I believe, and installed a new battery so I have a good power source. The ups checked out ok. Now to get the Lehman constructed. __________________________________ Do you Yahoo!? Win a $20,000 Career Makeover at Yahoo! HotJobs http://hotjobs.sweepstakes.yahoo.com/careermakeover __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay auction From: BOB BARNS royb1@........... Date: Sun, 02 May 2004 10:08:20 -0400 Hi gang, Geology Telemetrics Ranger Seismometer Test Probe Item number: 3813435325 ends May 8. Bob Barns Reunite Gondwanaland! __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: are these real? From: "tdick" dickthomas01@............. Date: Fri, 7 May 2004 12:17:29 -0500 I have put some seismograms(?) out on Internet. Site is Dad.bachcottage.com. It will look just like a disk on your computer. Would anyone have time to give me some constructive criticism? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: are these real? From: sismos@.............. Date: Fri, 7 May 2004 21:49:29 -0400 Hello Dick, I took a peek at most of the seismograms on your page and with the exception of the one in Costa Rica I really could not see anything. I don't see how you could get SDR to trigger on those signals. I would say things are not right, I can't say what off hand. In the CR set I don't see much difference between the lehman and the geophones, maybe use a bit of filtering. With your lehman are you able to see something around six seconds, you should. I think that that would be an indicator that your long period device is more or less working. As I recall you had some pictures posted of you lehman, are they still up? What is the setup of you different stations? angel Friday, May 7, 2004, 1:17:29 PM, you wrote: t> I have put some seismograms(?) out on Internet. Site is Dad.bachcottage.com. t> It will look just like a disk on your computer. Would anyone have time to t> give me some constructive criticism? t> __________________________________________________________ t> Public Seismic Network Mailing List (PSN-L) t> To leave this list email PSN-L-REQUEST@.............. with t> the body of the message (first line only): unsubscribe t> See http://www.seismicnet.com/maillist.html for more information. -- Best regards, sismos mailto:sismos@.............. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: are these real? From: "tdick" dickthomas01@............. Date: Fri, 7 May 2004 22:41:12 -0500 > angel > I suppose I am trying to filter too much. Look at just the Guatemala quake of the 3d of May -- a big one. It was triggered by WinSDR. (The seismograms that I first saw 50 years ago didn't have all this filtering.) I think you expect to see seismograms that look like test 1 and test 1a -- not in a folder -- right?? -- same data used to do those in the May folder. I can't get away from seeing the wave shape at "P" and "S" etc. so the horizontal units appeal to be -- as well as too much filtering; the east-west geophone seems to lack sensitivity - even the north-south picks up this quake better. I am in a high noise area. The geophones are buried four foot down about ten feet from a 4 1/2 acre lake. The Lehmans and HM vertical are about the same depth but in the basement of the house. There are two strip mines (coal) within forty miles and two rock quarries within 120 miles. The house is fifty years old and was built on swamp land. Period on the Lehmans is around 5 secs -- I have no idea what the vertical is. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: OT: Online radiotion monitors ? From: Mark Robinson mark.robinson@............... Date: Sat, 08 May 2004 16:33:52 +1200 Hi everyone, Does anyone know of any online radiation detectors, especially in eastern europe ? regards Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Batteries needed From: "Kareem Lanier" kareem@............. Date: Sat, 8 May 2004 07:36:21 -0700 Does anyone know where I can two batteries for my PS2 Kinemetrics system? It's a much older seismic recording system but the current batteries are dead. The battery specs are: Interstate Batteries PC1270 12 Volt, 7.0 AH. Kareem ---------------------------------------------------------------------------- ------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
Does anyone know where I can = two batteries for my=20 PS2 Kinemetrics system? It's a much older seismic recording system but = the=20 current batteries are dead.
 
The=20 battery specs are:
Interstate Batteries PC1270 12 Volt, 7.0=20 AH.
 
Kareem
 
----------------------------------------------------------------= -------------------------------
Kareem's = HeyJooJoo.Com - Discover, Explore, = Learn &=20 Play
 
All of my = outgoing and=20 incoming emails are scanned for viruses and worms by my antivirus=20 software.
 
Subject: RE: Batteries needed From: Darrell Collins dcollins338@....... Date: Sat, 08 May 2004 08:29:55 -0700 Look at http://www.zbattery.com/zbattery/pc1270.html At 07:36 AM 5/8/2004 -0700, you wrote: >Does anyone know where I can two batteries for my PS2 Kinemetrics system? >It's a much older seismic recording system but the current batteries are dead. > >The battery specs are: >Interstate Batteries PC1270 12 Volt, 7.0 AH. > >Kareem > >--------------------------------------------------------------------------- >-------------------- >Kareem's >HeyJooJoo.Com - >Discover, Explore, Learn & Play > >All of my outgoing and incoming emails are scanned for viruses and worms >by my antivirus software. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Batteries needed From: "Doug Crice" dcrice@............ Date: Sat, 8 May 2004 08:37:42 -0700 These are sealed lead acid batteries available from a number of manufacturers in standard sizes. You might even find them at Radio Shack under a different manufacturer. Interstate seems to have disappeared, = but you should find an equivalent at Energy Sales, http://www.energy-sales.com/sealedleadacid.html. Pick a brand e.g. Power Sonic and I think you will find a battery with = the same dimensions and capacity. =20 Doug Crice Geostuff http://www.georadar.com/geostuff.htm 12996 Somerset Drive phone 1-530-274-4445 Grass Valley, CA 95945 USA fax 1-530-274-4446 =20 -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... = On Behalf Of Kareem Lanier Sent: Saturday, May 08, 2004 7:36 AM To: PSN Subject: RE: Batteries needed =20 Does anyone know where I can two batteries for my PS2 Kinemetrics = system? It's a much older seismic recording system but the current batteries are dead.=20 =20 The battery specs are:=20 Interstate Batteries PC1270 12 Volt, 7.0 AH. =20 Kareem =20 -------------------------------------------------------------------------= --- ------------------- Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play =20 All of my outgoing and incoming emails are scanned for viruses and worms = by my antivirus software. =20

These are sealed lead acid = batteries available from a number of manufacturers in standard sizes. You might = even find them at Radio Shack under a different manufacturer.  Interstate = seems to have disappeared, but you should find an equivalent at Energy Sales, http://www.energ= y-sales.com/sealedleadacid.html.

Pick a brand e.g. Power Sonic and I = think you will find a battery with the same dimensions and = capacity.

 

Doug Crice

Geostuff    &nb= sp;        http://www.georadar.com/geostuff.htm

12996 Somerset Drive           &n= bsp;    phone 1-530-274-4445

Grass Valley,  CA  = 95945  USA    fax 1-530-274-4446

 

-----Original = Message-----
From: = psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Kareem Lanier
Sent: Saturday, May 08, = 2004 7:36 AM
To: PSN
Subject: RE: Batteries = needed

 

Does anyone know where I can two batteries for my PS2 Kinemetrics = system? It's a much older seismic recording system but the current batteries are = dead.

 

The battery specs are:

Interstate Batteries PC1270 12 Volt, 7.0 AH.

 

Kareem

 

--------------------------------------------------------------------= ---------------------------

Kareem's HeyJooJoo.Com = - Discover, Explore, Learn & Play

 

All of my outgoing and incoming emails are scanned for viruses and = worms by my antivirus software.

 

Subject: RE: Batteries needed From: "Steve Hammond" shammon1@............. Date: Sat, 8 May 2004 08:52:37 -0700 You can also call HSC in Santa Clara, CA to see if they have it. Here is their website http://www.halted.com/store/index.html They sell all types of after market electronics items. Great place-- Good people, good prices. One of my stops on the "I've gone tech shopping days..." Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Darrell Collins Sent: Saturday, May 08, 2004 8:30 AM To: psn-l@.............. Subject: RE: Batteries needed Look at http://www.zbattery.com/zbattery/pc1270.html At 07:36 AM 5/8/2004 -0700, you wrote: >Does anyone know where I can two batteries for my PS2 Kinemetrics system? >It's a much older seismic recording system but the current batteries are dead. > >The battery specs are: >Interstate Batteries PC1270 12 Volt, 7.0 AH. > >Kareem > >--------------------------------------------------------------------------- >-------------------- >Kareem's >HeyJooJoo.Com - >Discover, Explore, Learn & Play > >All of my outgoing and incoming emails are scanned for viruses and worms >by my antivirus software. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Batteries needed From: "Kareem Lanier" kareem@............. Date: Sat, 8 May 2004 09:20:35 -0700 Hey, thank you all. It looks like Radio Shack did carry these batteries at least at some point. But I'm gonna check the other online sources you suggested - they tend to be more affordable. Thanks again, Kareem -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Steve Hammond Sent: Saturday, May 08, 2004 8:53 AM To: psn-l@.............. Subject: RE: Batteries needed You can also call HSC in Santa Clara, CA to see if they have it. Here is their website http://www.halted.com/store/index.html They sell all types of after market electronics items. Great place-- Good people, good prices. One of my stops on the "I've gone tech shopping days..." Steve Hammond PSN San Jose Aptos, CA -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@................. Behalf Of Darrell Collins Sent: Saturday, May 08, 2004 8:30 AM To: psn-l@.............. Subject: RE: Batteries needed Look at http://www.zbattery.com/zbattery/pc1270.html At 07:36 AM 5/8/2004 -0700, you wrote: >Does anyone know where I can two batteries for my PS2 Kinemetrics system? >It's a much older seismic recording system but the current batteries >are dead. > >The battery specs are: >Interstate Batteries PC1270 12 Volt, 7.0 AH. > >Kareem > >----------------------------------------------------------------------- >---- >-------------------- >Kareem's >HeyJooJoo.Com - >Discover, Explore, Learn & Play > >All of my outgoing and incoming emails are scanned for viruses and >worms by my antivirus software. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Batteries needed From: Raul Alvarez ralvarez@........ Date: Sat, 08 May 2004 15:42:25 -0600 Here is another source. http://batteriesplus.com/ They claim to stock many unusual types. Raul Kareem Lanier wrote: > Does anyone know where I can two batteries for my PS2 Kinemetrics > system? It's a much older seismic recording system but the current > batteries are dead. > > The battery specs are: > Interstate Batteries PC1270 12 Volt, 7.0 AH. > > Kareem > > ----------------------------------------------------------------------------------------------- > Kareem's HeyJooJoo.Com > - Discover, Explore, Learn & Play > > All of my outgoing and incoming emails are scanned for viruses and > worms by my antivirus software. > Here is another source.
http://batteriesplus.com/
They claim to stock many unusual types.

Raul

Kareem Lanier wrote:
Does anyone know where I can two batteries for my PS2 Kinemetrics system? It's a much older seismic recording system but the current batteries are dead.
 
The battery specs are:
Interstate Batteries PC1270 12 Volt, 7.0 AH.
 
Kareem
 
-----------------------------------------------------------------------------------------------
Kareem's HeyJooJoo.Com - Discover, Explore, Learn & Play
 
All of my outgoing and incoming emails are scanned for viruses and worms by my antivirus software.
 
Subject: Re: Batteries needed From: Mark Robinson mark.robinson@............... Date: Sun, 09 May 2004 13:36:39 +1200 Kareem Lanier wrote: > Does anyone know where I can two batteries for my PS2 Kinemetrics > system? It's a much older seismic recording system but the current > batteries are dead. > > The battery specs are: > Interstate Batteries PC1270 12 Volt, 7.0 AH. Kareem, You should be able to get these batteries easily locally. They are often used in UPSes for computers, and in alarm systems, so try shop around companies that deal in those areas and you should find something at a good price. Most retail electronics companies carry them as well. regards Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: are these real? From: "Connie and Jim Lehman" lehmancj@........... Date: Sun, 9 May 2004 16:47:35 -0400 Dick--I had a look at the records, and am unable to decipher exactly what you are seeing. You may wish to concentrate on only one sensor and get to within the parameters expected. It looks as you have unusual noise, or microseisms that you amplify at the expense of a valid p, s, & l wave arrival. Microseisms are our friends, as they tell us the system is working normally, but an incoming event should ride well above microseismic level. You speak of filtering, and I know this is an area of expertise much of which I am not familiar with. In long period sensors, the only filtering I was concerned with was 60 hz power noise, and an occasional mechanical noise depending on the location of the sensor to a mechanical room in the area. Usually a simple passive filter took out the chatter........ I rather doubt the rock quaries or strip mines have any influence on your site at the distances given. If you work with the "Lehman" design, bring that period up to at least 15 seconds---adjust the damping to within the limits and set the gain to see microseisms at a low level all the time--and events should show---------- Best wishes, Jim Lehman ----- Original Message ----- From: "tdick" To: Sent: Friday, May 07, 2004 11:41 PM Subject: Re: are these real? > > > > angel > > > I suppose I am trying to filter too much. Look at just the Guatemala quake > of the 3d of May -- a big one. It was triggered by WinSDR. (The seismograms > that I first saw 50 years ago didn't have all this filtering.) I think you > expect to see seismograms that look like test 1 and test 1a -- not in a > folder -- right?? -- same data used to do those in the May folder. I can't > get away from seeing the wave shape at "P" and "S" etc. so the horizontal > units appeal to be -- as well as too much filtering; the east-west geophone > seems to lack sensitivity - even the north-south picks up this quake better. > I am in a high noise area. The geophones are buried four foot down about ten > feet from a 4 1/2 acre lake. The Lehmans and HM vertical are about the same > depth but in the basement of the house. There are two strip mines (coal) > within forty miles and two rock quarries within 120 miles. The house is > fifty years old and was built on swamp land. Period on the Lehmans is around > 5 secs -- I have no idea what the vertical is. > > > __________________________________________________________ > > 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 listing in database From: Dave Nelson davenn@............... Date: Mon, 10 May 2004 19:56:57 +1000 greetings all from the "land down under" I would like to wish Geoffrey Voeth of Apache Junction, Arizona to the PSN group you will find his dot on the USA map and his info in the database happy recording cheers Dave Subject: RE: Online radiotion monitors ? From: "John D Nelson" jnelson@................. Date: Mon, 10 May 2004 14:27:10 -0500 Moscow has a neutron monitor station http://helios.izmiran.rssi.ru/cosray/main.htm Some other interesting stuff there as well. John Nelson -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Mark Robinson Sent: Friday, May 07, 2004 11:34 PM To: psn-l@.............. Subject: OT: Online radiotion monitors ? Hi everyone, Does anyone know of any online radiation detectors, especially in=20 eastern europe ? regards Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay auction From: BOB BARNS royb1@........... Date: Thu, 13 May 2004 10:24:02 -0400 Hi gang, WHITE INDUSTRIAL SEISMOLOGY MINI-SEIS ll Item number: 3815390573 ends 5/19 Bob Barns Reunite Gondawanaland! (or would this put all seismologists out of business?) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay auction From: BOB BARNS royb1@........... Date: Fri, 21 May 2004 13:44:08 -0400 Hi gang, SBEL Seismic Analyzer Model 1007H - seismology Item number: 3293684759 ends 5/27 A mystery to me;maybe someone can explain it. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay auction From: Richard Gagnon richg_1998@......... Date: Fri, 21 May 2004 10:59:31 -0700 (PDT) Here is a link to SBEL site. This might be part of a complete system. Guessing. http://www.sbel.com/index.html Richard --- BOB BARNS wrote: > Hi gang, > SBEL Seismic Analyzer Model 1007H - seismology > Item number: 3293684759 ends 5/27 > A mystery to me;maybe someone can explain it. > 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. __________________________________ Do you Yahoo!? Yahoo! Domains – Claim yours for only $14.70/year http://smallbusiness.promotions.yahoo.com/offer __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay auction From: Raul Alvarez ralvarez@........ Date: Fri, 21 May 2004 13:27:39 -0600 Hello All, I'm the one offering this item. This unit came from a local university surplus auction. I am not sure of it's actual application, but since it's AC powered, it most likely not for field use. After viewing their website I suspect it's for stress testing application?? I'm not in the business of seismology, just as a hobby for an old retired guy. Raul Richard Gagnon wrote: >Here is a link to SBEL site. This might be part of a complete system. Guessing. > >http://www.sbel.com/index.html > >Richard > > > >--- BOB BARNS wrote: > > >>Hi gang, >> SBEL Seismic Analyzer Model 1007H - seismology >> Item number: 3293684759 ends 5/27 >>A mystery to me;maybe someone can explain it. >>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. >> >> > > > > > >__________________________________ >Do you Yahoo!? >Yahoo! Domains - Claim yours for only $14.70/year >http://smallbusiness.promotions.yahoo.com/offer >__________________________________________________________ > >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. > > > Hello All,

I'm the one offering this item. This unit came from a local university surplus auction.  I am not sure of it's actual application, but since it's AC powered, it most likely not for field use.  After viewing their website I suspect it's for stress testing application??  I'm not in the business of seismology, just as a hobby for an old retired guy.

Raul

Richard Gagnon wrote:
Here is a link to SBEL site. This might be part of a complete system. Guessing.

http://www.sbel.com/index.html

Richard



--- BOB BARNS <royb1@...........> wrote:
  
Hi gang,
      SBEL Seismic Analyzer Model 1007H - seismology
	 Item number: 3293684759 ends 5/27
A mystery to me;maybe someone can explain it.
Bob Barns


		

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Subject: Coso Hot Springs - Quake Swarm From: "Bob Hancock" robert.hancock@........... Date: Thu, 27 May 2004 17:23:23 -0400 There appears to be a micro-quake swarm in the vicinity of Coso Hot Springs, CA, just north of China Lake. Has anyone seen any information from the USGS or anywhere else on this event. Bob Hancock __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: "Slow" Earthquakes May Help Predict Major Quakes From: Ben Bradley benbradley@.............. Date: Thu, 27 May 2004 19:26:26 -0400 I saw a mention of "slow" earthquakes in the archives in March 2003, while the last one was apparently occurring. This page has a few pointers to current articles on the topic: http://science.slashdot.org/article.pl?sid=04/05/24/1433251 --- http://mindspring.com/~benbradley __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay item-book by Bullen From: BOB BARNS royb1@........... Date: Wed, 02 Jun 2004 09:59:37 -0400 Hi gang, INTRODUCTION TO THE THEORY OF SEISMOLOGY-Bullen, K.E. Item number: 6902756937 ends 6/8 Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Dataq DI-194RS Question From: "Mike Lozano" mikel@............... Date: Fri, 4 Jun 2004 11:47:51 -0500 Folks, I have a Dell Latitude 610 running Windows XP Professional. I installed a Dataq DI-194RS with which to hook up my Geo-Space Geophone to monitor local blasting at a nearby quarry. Installation went fine, but the program runs without displaying on the screen. I have a similar problem with a printed circuit board design program named WinBoard. I'm at my wits end and am considering junking XP Pro and installing Windows 2000 Pro, with which I never have had any problems. Anybody out there run into the same problem? Any suggestions? Is this solely an XP quirk? Any help would be appreciated. Thanks, Mike Lozano Chief Meteorologist News 9 San Antonio 210-581-9918 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay auction From: BOB BARNS royb1@........... Date: Fri, 04 Jun 2004 14:06:21 -0400 Geology Telemetrics Ranger Seismometer Test Probe Item number: 3819545005 ends June 9 Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Dataq DI-194RS Question From: John or Jan Lahr johnjan@........ Date: Sat, 05 Jun 2004 07:47:54 -0700 Dear Mike, I don't think your problem is with the operating system. Which software are you using? I would suggest using the free program AmaSeis. You can get it from Alan Jones' web site: http://www.geol.binghamton.edu/faculty/jones/jones.html Give it a try and let me know if you have any problems. John Lahr At 09:47 AM 6/4/2004, you wrote: >Folks, > >I have a Dell Latitude 610 running Windows XP Professional. I installed >a Dataq DI-194RS with which to hook up my Geo-Space Geophone to monitor >local blasting at a nearby quarry. Installation went fine, but the >program runs without displaying on the screen. I have a similar problem >with a printed circuit board design program named WinBoard. > >I'm at my wits end and am considering junking XP Pro and installing >Windows 2000 Pro, with which I never have had any problems. Anybody out >there run into the same problem? Any suggestions? Is this solely an >XP quirk? > >Any help would be appreciated. > >Thanks, > >Mike Lozano >Chief Meteorologist >News 9 San Antonio >210-581-9918 > >--- >Outgoing mail is certified Virus Free. >Checked by AVG anti-virus system (http://www.grisoft.com). >Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 > > >__________________________________________________________ > >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: Dataq DI-194RS Question From: Mauro Mariotti mariotti@......... Date: Sat, 05 Jun 2004 19:04:42 +0200 Hello Mike, you can also try Seismowin. You can download it from www.infoeq.it follow english, software, seismowin.. it support some a/d boards and also the DI-194 the output is compatible with WinQuake... regards mauro >At 09:47 AM 6/4/2004, you wrote: >>Folks, >> >>I have a Dell Latitude 610 running Windows XP Professional. I installed >>a Dataq DI-194RS with which to hook up my Geo-Space Geophone to monitor >>local blasting at a nearby quarry. Installation went fine, but the >>program runs without displaying on the screen. I have a similar problem >>with a printed circuit board design program named WinBoard. >> >>I'm at my wits end and am considering junking XP Pro and installing >>Windows 2000 Pro, with which I never have had any problems. Anybody out >>there run into the same problem? Any suggestions? Is this solely an >>XP quirk? >> >>Any help would be appreciated. >> >>Thanks, >> >>Mike Lozano >>Chief Meteorologist >>News 9 San Antonio >>210-581-9918 >> >>--- >>Outgoing mail is certified Virus Free. >>Checked by AVG anti-virus system (http://www.grisoft.com). >>Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 >> >> >>__________________________________________________________ >> >>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: RE: Dataq DI-194RS Question From: "Mike Lozano" mikel@............... Date: Sat, 5 Jun 2004 16:46:49 -0500 Thanks Mauro, John and Roger, I've downloaded both of the suggested programs and will try them out this evening. The program I'm using currently is the software which came with the DI-194RS starter kit. Then, I also downloaded the upgraded version from the DATAQ web site. Both versions of those program will not display. At this point, all I have is the Geo-Space sensor, but I've built up a Lehman made of one-inch thick aircraft aluminum. Dimensions are 30" LENGTH; 10" WIDTH; 20" HEIGHT. It's totally non-magnetic and is bolted together with stainless steel bolts. All I've got to work on is the pickup coil and magnet mount. I'll try to post a picture of it on my web site soon. Thanks for the feedback. I'll post my results on the message board by tomorrow. Mike Lozano San Antonio, Texas 29:38:34.055N 98:29:08.045W --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Dataq DI-194RS Question From: "Mike Lozano" mikel@............... Date: Mon, 7 Jun 2004 23:28:58 -0500 Bob, Thanks for the information. Like you, I couldn't get Mauro's program to work, but I did get AmaSeis to work - at least it did for a while. As to the screen resolution, I'm not sure why the program I loaded from the starter package CD opens up in 640 resolution instead of 1024. I'm going to play with it some more. That's not the only problem I'm having with this laptop though. I tried to install ActiveSync (which came with my HP Pocket PC), but it won't read to any of the COM ports!!! Our IT guy was telling me this afternoon, that it's likely a bug with the Dell version of Windows XP Professional. He's going to mess around with it tomorrow. By the way: I've developed a circuit to measure 1 to 50 Pf of capacitance and feed it as a current loop to a remote point. I'm thinking of building a horizontal pendulum seismograph similar to the Shackleford-Gunderson, except without the RF oscillator. Has anyone had any experiences along these lines? I'm going to build it in a leftover enclosure built of a welded 5/8 inch thick aircraft aluminum. Picture a frame that's 20 inches long; 10 inches wide and 4 inches thick. One open side is made of 1 inch thick Plexiglas. bolted at 2 inch intervals. I had originally designed this to be a vacuum chamber for a project involving leaking welds. The company sponsoring the project was sold, and the project was canned. At any rate, what I'm thinking of doing is to make the hanging arm out of 1" x 1/2" x 15" aluminum, suspended with stainless-steel thin gauge safety wire. Halfway along the rod I'll mount a 10 pound machined plumber's weight, in which I'll machine a rectangular hole. The bottom of the rod will pass between two electrically 'floating' gates. The capicitance will be that measured between the gates and the rod. Hopefully, it'll work. If not, it'll at least keep me out of the wife's hair for a few weekends. In case anyone's curious about my supply of aircraft aluminum, I bought about one hundred plus pounds of it at the Rockwell-Collins surplus outlet in Marion, Iowa several years ago. Since I live in the Texas Hill Country north of San Antonio, the limestone bedrock is less than 6 inches below the grass in the yard. Thanks everyone, for your comments and suggestions. Cheers, Mike Lozano San Antonio, Texas -----Original Message----- From: Bobhelenmcclure@....... [mailto:Bobhelenmcclure@........ Sent: Sunday, June 06, 2004 9:11 PM To: mikel@............... Subject: Re: Dataq DI-194RS Question In a message dated 6/6/2004 5:35:23 PM Eastern Daylight Time, mikel@............... writes: I'm now going to install the AMSEIS software, as well as the version Mauro wrote. Hi Mike, I'm pleased to hear you solved your problem, even if I cannot fathom how you could get different screen resolutions on recording and playback. I assume you know that you can make the screens any size you want by dragging on the border. The monitor screen should always display whatever resolution you set up in Windows. I operate three broadband sensors, using a DI-154 at 5 samples per second per channel. Keeping accurate time is important to me, so I make minute marks on my recordings using a signal derived from a WWVB controlled wall clock. I cannot use AmaSeis because it does not record my marks which are applied to the DI-154/194 digital input. It also records only one channel, and has at most 12 bit resolution. The Dataq Lite recorder can record up to 4 channels, accepts the minute marks, and uses a sample rate of 240 samples per second, which is averaged down to the recorded rate. I get 14 bits resolution because of this. Mauro sent me the Dataq version of SeismoWin, but it would never work for me. If you use it, I would like to know about it. It accepts more than one channel, but at less resolution than the Dataq recorder. Like Amaseis, its timing accuracy is only as good as the PC clock. I have written a lot of seismic applications for the Dataq serial devices using Visual Basic 6.0. You can look at my stuff at http://www.jclahr.com/science/psn/mcclure/ Regards, Bob McClure --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 Message
 Bob,<= /DIV>
 
Thanks for the information.  Like you, I couldn't get = Mauro's=20 program to work, but I did get AmaSeis to work - at least it did for a = while.  As to the screen resolution, I'm not sure why the program = I=20 loaded from the starter package CD opens up in 640 resolution instead = of=20 1024.   I'm going to play with it some more.  That's = not the=20 only problem I'm having with this laptop though.  I tried to = install=20 ActiveSync (which came with my HP Pocket PC), but it won't read to any = of the=20 COM ports!!!  Our IT guy was telling me this afternoon, that it's = likely=20 a bug with the Dell version of Windows XP Professional.  He's = going to=20 mess around with it tomorrow.
 
By=20 the way:  I've developed a circuit to measure 1 to 50 Pf of=20 capacitance and feed it as a current loop to a remote point.  I'm = thinking of building a horizontal pendulum seismograph similar to = the=20 Shackleford-Gunderson, except without the RF oscillator.  Has = anyone had=20 any experiences along these lines?  I'm going to build it in a = leftover=20 enclosure built of  a welded 5/8 inch thick aircraft = aluminum.  Picture a frame that's = 20 inches long;=20 10 inches wide and 4 inches thick.  One open side is made of 1 = inch thick=20 Plexiglas. bolted at 2 inch intervals.  I had originally designed = this to=20 be a vacuum chamber for a project involving leaking welds.  The = company=20 sponsoring the project was sold, and the project was=20 canned.
 
At=20 any rate, what I'm thinking of doing is to make the hanging arm out of = 1" x=20 1/2" x 15" aluminum, suspended with stainless-steel thin gauge safety=20 wire.  Halfway along the rod I'll mount a 10 pound machined = plumber's=20 weight, in which I'll machine a rectangular hole.  The = bottom of the=20 rod will pass between two electrically 'floating' gates. The = capicitance will=20 be that measured between the gates and the rod.  Hopefully, it'll = work.  If not, it'll at least keep me out of the wife's hair for = a few=20 weekends.  In case anyone's curious about my supply of aircraft = aluminum,=20 I bought about one hundred plus pounds of it at the = Rockwell-Collins=20 surplus outlet in Marion, Iowa several years ago.
 
Since I live in the Texas Hill Country north of San Antonio, = the=20 limestone bedrock is less than 6 inches below the grass in the=20 yard.
 
Thanks everyone, for your comments and = suggestions.
 
Cheers,
 
Mike=20 Lozano
San=20 Antonio, Texas
-----Original Message----- 
From: = Bobhelenmcclure@.......... [mailto:Bobhelenmcclure@........
Sent: Sunday, June 06, = 2004 9:11=20 PM
To: mikel@...............
Subject: Re: Dataq = DI-194RS=20 Question

In a = message dated 6/6/2004=20 5:35:23 PM Eastern Daylight Time, mikel@............... = writes:


I'm now going to install the AMSEIS software, as well = as the=20 version Mauro wrote.



Hi = Mike,

  I'm=20 pleased to hear you solved your problem, even if I cannot fathom how = you=20 could get different screen resolutions on recording and playback. I = assume=20 you know that you can make the screens any size you want by dragging = on the=20 border. The monitor screen should always display whatever resolution = you set=20 up in Windows.

  I operate three broadband sensors, = using a=20 DI-154 at 5 samples per second per channel. Keeping accurate time is = important to me, so I make minute marks on my recordings using a = signal=20 derived from a WWVB controlled wall clock. I cannot use AmaSeis = because it=20 does not record my marks which are applied to the DI-154/194 digital = input.=20 It also records only one channel, and has at most 12 bit resolution. =

  The Dataq Lite recorder can record up to 4 channels, = accepts=20 the minute marks, and uses a sample rate of 240 samples per second, = which is=20 averaged down to the recorded rate. I get 14 bits resolution because = of=20 this.

  Mauro sent me the Dataq version of SeismoWin, = but it=20 would never work for me. If you use it, I would like to know about = it. It=20 accepts more than one channel, but at less resolution than the Dataq = recorder. Like Amaseis, its timing accuracy is only as good as the = PC=20 clock.

  I have written a lot of  seismic = applications for=20 the Dataq serial devices using Visual Basic 6.0. You can look at my = stuff=20 at

 =20 = http://www.jclahr.com/science/psn/mcclure/

Regards,

Bob=20 McClure

---
Incoming mail is certified Virus = Free.
Checked by=20 AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.688 = / Virus=20 Database: 449 - Release Date: = 5/18/2004


---
Outgoing mail is certified Virus = Free.
Checked by=20 AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.688 / = Virus=20 Database: 449 - Release Date:=20 5/18/2004


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004

Subject: Screen resolution From: "Mike Lozano" mikel@............... Date: Mon, 7 Jun 2004 23:42:40 -0500 Hey everyone, Got the DATAQ software to operate in the high resolution mode. Clicked on properties and saw that the 640 'compatability' button had been selected. I de-selected it, and presto - it works. Thanks, Mike Lozano San Antonio, Texas --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 5/18/2004 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: distortion on geophones From: "tdick" dickthomas01@............. Date: Sun, 27 Jun 2004 09:22:21 -0500 Before I dig up my geophone which are about four feet down in my rose = bed -- I am trying to figure out if this distortion of wave form is due = to water in the bottom of the hole or due to a changes in the amplifier. = On local mine blasts I am getting distortion while on earthquakes I am = not. I have posted some examples at this site http://Dad.bachcottage.com it will look like a drive on your computer, open folder called = Distortion on geophones
Before I dig up my geophone which are = about four=20 feet down in my rose bed -- I am trying to figure out if this distortion = of wave=20 form is due to water in the bottom of the hole or due to a changes in = the=20 amplifier. On local mine blasts I am getting distortion while on = earthquakes I=20 am not. I have posted some examples at this site
 
http://Dad.bachcottage.com=
 
it will look like a drive on your = computer, open=20 folder called Distortion on geophones
Subject: Re: distortion on geophones From: Karl Cunningham karlc@.......... Date: Sun, 27 Jun 2004 08:20:52 -0700 Don't go for the shovel just yet... It looks to me like an asymmetry somewhere in the electronics. The mine blasts seem to be much higher signal level than the earthquakes, and the signal could be exceeding the voltage range of one of the stages. Likely in a filter stage or before it. What makes me think so is that in "local event vertical geophone3.GIF", after the distortion the signal takes a relatively long time to return to the original zero level (10 seconds or more). I don't think the geophone itself would take that long to return, which makes me think it's an electronic artifact. This distortion could be explained by the following: There is an asymetrical limit to the signal level in a stage in or prior to a low-pass filter. By asymetrical, I mean that the signal limit is greater negative than positive. Geophones, by their nature, put out fairly symmetrical signals -- the amount of electical energy on the plus side of zero is close to the amount on the minus side. But if there is an asymmetrical limit somewhere in the electronics and the signal is large enough to hit that limit, the resulting signal is no longer symmetrical about zero. Then the signal goes through a stage which filters out most of the high-frequency parts of the signal, so what you have left is the average which is no longer near zero. Obviously, I'm guessing at what it might be. Asymmetries in signal limits are often caused by assymetrical power supplies (if you have + and - supplies). They can also be caused by a large offset somewhere in the electronics such that the average is no longer centered bewteen the limits. You might not see such an offset because it is filtered out by Winquake or in the electronics. Good luck with it. Karl Cunningham --On Sunday, June 27, 2004 09:22 -0500 tdick wrote: > http://Dad.bachcottage.com __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Webupdate and Security question From: "Steve Hammond" shammon1@............. Date: Sun, 27 Jun 2004 09:55:43 -0700 I am in the process of updating the San Jose PSN Website. http://pw2.netcom.com/~shammon1/psnsj.htm I would like to list all the PSN websites on a links page. Please take a look at the list below and let me know if I'm missing any PSN sites. Thanks, Steve Hammond Italian Experimental Seismic Network (English version) Kailua-Kona, Hawaii Golden, Colorado Public Seismic Network Chirinet, Panama's Public Seismic Network Dominica Public Seismic Network Dunedin, New Zealand Fairbanks, Alaska F.E.S.N. - Italy Friuli Experimental Seismic Network Friendswood, Texas Public Seismic Network Kalamunda, Western Australia Memphis, Tennessee Mitchell, South Dakota Teleseismic Data Redwood City, California San Jose, California Public Seismic Network PSN forum discussion group Public Seismic Network Mailing List. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Webupdate and Security question From: Mauro Mariotti mariotti@......... Date: Sun, 27 Jun 2004 19:00:52 +0200 You may want to add www.infoeq.it regards mauro At 18:55 27/06/2004, you wrote: >I am in the process of updating the San Jose PSN Website. >http://pw2.netcom.com/~shammon1/psnsj.htm > >I would like to list all the PSN websites on a links page. Please take a >look at the list below and let me know if I'm missing any PSN sites. > >Thanks, Steve Hammond > >Italian Experimental Seismic Network (English version) >Kailua-Kona, Hawaii >Golden, Colorado Public Seismic Network >Chirinet, Panama's Public Seismic Network >Dominica Public Seismic Network >Dunedin, New Zealand >Fairbanks, Alaska >F.E.S.N. - Italy Friuli Experimental Seismic Network >Friendswood, Texas Public Seismic Network >Kalamunda, Western Australia >Memphis, Tennessee >Mitchell, South Dakota Teleseismic Data >Redwood City, California >San Jose, California Public Seismic Network >PSN forum discussion group Public Seismic Network Mailing List. > >__________________________________________________________ > >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: distortion on geophones From: "Larry Cochrane" lcochrane@.............. Date: Mon, 28 Jun 2004 00:02:50 -0700 Tom, This looks like an electrical problem rather then a problem with the sensor. Is the signal from the sensor going through one of my Amp/Filter boards? If it is you may want to send it back to me so I can check it out. Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "tdick" To: Sent: Sunday, June 27, 2004 7:22 AM Subject: distortion on geophones Before I dig up my geophone which are about four feet down in my rose bed -- I am trying to figure out if this distortion of wave form is due to water in the bottom of the hole or due to a changes in the amplifier. On local mine blasts I am getting distortion while on earthquakes I am not. I have posted some examples at this site http://Dad.bachcottage.com it will look like a drive on your computer, open folder called Distortion on geophones __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: distortion on geophones From: Mauro Mariotti mariotti@......... Date: Mon, 28 Jun 2004 09:12:24 +0200 I agree they seems to be electic problem but related to connections check carefully your connectors. That effect is due to the big spikes (often originated by the connector that don't press so well) then the High Pass filter modify the DC level in the way I see on the chart. Hope this helps. Regards mauro At 09:02 28/06/2004, you wrote: >Tom, > >This looks like an electrical problem rather then a problem with the sensor. >Is the signal from the sensor going through one of my Amp/Filter boards? If >it is you may want to send it back to me so I can check it out. > >Larry Cochrane >Redwood City, PSN > >----- Original Message ----- >From: "tdick" >To: >Sent: Sunday, June 27, 2004 7:22 AM >Subject: distortion on geophones > > >Before I dig up my geophone which are about four feet down in my rose bed -- >I am trying to figure out if this distortion of wave form is due to water in >the bottom of the hole or due to a changes in the amplifier. On local mine >blasts I am getting distortion while on earthquakes I am not. I have posted >some examples at this site > >http://Dad.bachcottage.com > >it will look like a drive on your computer, open folder called Distortion on >geophones > >__________________________________________________________ > >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: distortion on geophones From: "tdick" dickthomas01@............. Date: Mon, 28 Jun 2004 12:37:11 -0500 > Tom, >=20 > This looks like an electrical problem rather then a problem with the = sensor. > Is the signal from the sensor going through one of my Amp/Filter = boards? If > it is you may want to send it back to me so I can check it out. Larry I got several comments that changed my thinking and you may be = right. I originally thought it was water in the bottom of the hole that = the geophones were buried in. The geophones are in a 3x3 block of wood, = in a 4 inch PVC pipe sealed on both ends and about four feet down -- = very near the surface level of a lake 15 ft away. I noticed the problem = about the time the rains started here in early April . But I was = concentrating on local stuff. About that time I also changed my = filtering -- trying to get a better display for a Internet site. Last = night the two earthquakes- Illinois & Alaska showed an interesting = contrast.=20 See all six Alaska and Illinois unfiltered = http://Dad.bachcottage.com/June 28/raw pics&data . The more intense = Illinois quake seems more distorted, even on the homemade vertical and = Lehman's while not so on the Alaskan quake. If I am doing the filtering = right, it seems to filter out on the homemade vertical and Lehman's -- = see files unfiltered-filtered in same folder. If you have time, look = over this folder -- and any other stuff on this disk you have time -- I = even enclosed raw data and individual event files. All electronics are = yours. I did remove the jumpers on the amp board.
 

> Tom,
>
> This looks = like an=20 electrical problem rather then a problem with the sensor.
> Is the = signal=20 from the sensor going through one of my Amp/Filter boards? If
> it = is you=20 may want to send it back to me so I can check it out.
Larry I got = several=20 comments that changed my thinking and you may be right. I originally = thought it=20 was water in the bottom of the hole that the geophones were buried in. = The=20 geophones are in a 3x3 block of wood, in a 4 inch PVC pipe sealed on = both ends=20 and about four feet down -- very near the surface level of a lake 15 ft = away. I=20 noticed the problem about the time the rains started here in early April = ..=20 But I was concentrating on local stuff. About that time I also = changed my=20 filtering -- trying to get a better display for a Internet site. Last = night the=20 two earthquakes- Illinois & Alaska showed an interesting = contrast.=20
 
See all six Alaska and  = Illinois=20 unfiltered  http://Dad.bachcottage.com/June=20 28/raw pics&data . The more intense Illinois quake seems more = distorted,=20 even on the homemade vertical and Lehman's while not so on the Alaskan = quake. If=20 I am doing the filtering right, it seems to filter out on the homemade = vertical=20 and Lehman's -- see files unfiltered-filtered in same folder. If you = have time,=20  look over this folder -- and any other stuff on this disk you have = time=20 -- I even enclosed raw data and individual event files. All = electronics are=20 yours. I did remove the jumpers on the amp board.
 
 
Subject: Re: distortion on geophones From: "tdick" dickthomas01@............. Date: Mon, 28 Jun 2004 12:50:53 -0500 Look at today's quakes -- See all six Alaska and Illinois unfiltered http://Dad.bachcottage.com/June 28/raw pics&data . The more intense Illinois quake seems more distorted, even on the homemade vertical and Lehman's while not so on the Alaskan quake. If I am doing the filtering right, it seems to filter out on the homemade vertical and Lehman's -- see files unfiltered-filtered in same folder. If you have time, look over this folder -- and any other stuff on this disk you have time -- I even enclosed raw data and individual event files. All electronics are yours. I did remove the jumpers on the amp board. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Webupdate and Security question From: FRANK COOPER fxc@........... Date: Mon, 28 Jun 2004 15:48:58 -0700 (PDT) Hi Steve, Please include Pearland Texas, Public Seismic Network. That is John Cole's seismic web site. His url is http://pages.prodigy.net/fxc/JC.html Thanks, Frank Cooper Friendswood, Texas PSN http://pages.prodigy.net/fxc/ --- Steve Hammond wrote: > I am in the process of updating the San Jose PSN > Website. > http://pw2.netcom.com/~shammon1/psnsj.htm > > I would like to list all the PSN websites on a links > page. Please take a > look at the list below and let me know if I'm > missing any PSN sites. > > Thanks, Steve Hammond > > Italian Experimental Seismic Network (English > version) > Kailua-Kona, Hawaii > Golden, Colorado Public Seismic Network > Chirinet, Panama's Public Seismic Network > Dominica Public Seismic Network > Dunedin, New Zealand > Fairbanks, Alaska > F.E.S.N. - Italy Friuli Experimental Seismic Network > Friendswood, Texas Public Seismic Network > Kalamunda, Western Australia > Memphis, Tennessee > Mitchell, South Dakota Teleseismic Data > Redwood City, California > San Jose, California Public Seismic Network > PSN forum discussion group Public Seismic Network > Mailing List. > > __________________________________________________________ > > 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: distortion on geophones From: "tdick" dickthomas01@............. Date: Mon, 28 Jun 2004 20:52:29 -0500 ----- Original Message ----- From: "Mauro Mariotti"> That effect is due to the big spikes then the High Pass filter modify the DC level > in the way I see on the chart. > Hope this helps. > Regards > mauro > > My setup is all Larry's electronics -- after reading several good replies --- I opened my settings under Alarm and noticed that for some reason the geophone settings had zero in the highpass filter instead of a positive integer. Would this cause the distortion? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: distortion on geophones From: "Larry Cochrane" lcochrane@.............. Date: Tue, 29 Jun 2004 00:18:07 -0700 Tom, Have you tried swapping channels on the Amp/Filter board by connecting the Geophone to the Lehman input and the Lehman to the Geophone input? If the problem moves then the problem is more likely with the sensor. -Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "tdick" To: Sent: Monday, June 28, 2004 10:50 AM Subject: Re: distortion on geophones > Look at today's quakes -- > See all six Alaska and Illinois unfiltered http://Dad.bachcottage.com/June > 28/raw pics&data . The more intense Illinois quake seems more distorted, > even on the homemade vertical and Lehman's while not so on the Alaskan > quake. If I am doing the filtering right, it seems to filter out on the > homemade vertical and Lehman's -- see files unfiltered-filtered in same > folder. If you have time, look over this folder -- and any other stuff on > this disk you have time -- I even enclosed raw data and individual event > files. All electronics are yours. I did remove the jumpers on the amp board. > > > __________________________________________________________ > > 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: distortion on geophones - conclusion From: "tdick" dickthomas01@............. Date: Tue, 29 Jun 2004 08:21:07 -0500 > That effect is due to the big spikes (often originated by the = connector > that don't press so well) then the High Pass filter modify the DC = level > in the way I see on the chart. Mauro had a good idea -- the distortion disappeared! See Costa Rico = quake today at Dad.bachcottage.com in June 29 folder.
 

> That effect is due to the big = spikes=20 (often originated by the connector
> that don't press so well) = then the=20 High Pass filter modify the DC = level
> in the=20 way I see on the chart.
Mauro had a good idea -- the distortion = disappeared! See Costa Rico quake today at Dad.bachcottage.com in June = 29=20 folder.
Subject: From: Jason Brady jr_brady@........... Date: Tue, 29 Jun 2004 16:59:54 -0700 Hi All, Finished building my first seismometer last weekend. It's the familiar Lehman design based on instructions, ideas and information from PSN and other resources on the 'Net. Several rather grainy pictures can be seen at http://home.comcast.net/~jr_brady/index.html (temp URL). Sorry about that; I really must purchase a better digital camera... The seismometer is built on a 12" x 36" solid aluminum base anchored to the concrete floor. 1" square hollow aluminum tubing forms the upright apparatus and supports. The boom is 1/2" square aluminum rod, 30" long, with a 5 pound lead mass. The pivot is a ball bearing/polished bolt head combination. Guitar wire and turnbuckle forms the suspension. I custom- wound the coil using almost 1 pound of #34 magnet wire. Coil impedance is 1.9K ohms. The magnet is standard Alnico bridge with 35-pound pull. Boom stops, component mounting brackets, etc. are formed from 1/2" flat aluminum stock 1/8" thick. Used brass hardware throughout. No damping yet in place. I'm fine-tuning the period and centering and want to give it some time to settle before damping. About a 15 second period seems to be the maximum obtainable thus far. Note the DIP socket mounted on a small piece of perfboard to the left of the BNC connector to allow easy insertion of a resistor across the coil output. I also attached a copper vane for oil damping if the resistive approach doesn't work. Even made provision for mounting eddy current damping hardware (the beauty of working with soft metals like aluminum--easily cut, drilled, tapped). I attached the device to Larry Cochrane's Amplifier/Filter and ADC. The undamped sensitivity is amazing! Gently stepping across the floor a good distance away sets the boom in motion. Will be interesting to see how it responds to true seismic events once properly damped. I missed the recent Alaska quake, but being near the Juan de Fuca fault/subduction zone I hope to record a decent amount of activity. Any comments or suggestions on the design, construction, etc.? Thanks, Jason Brady Lynnwood, WA USA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: From: "David H. Youden" dyouden@............. Date: Wed, 30 Jun 2004 05:50:31 -0400 Hi Jason, It looks good. THanks a lot for sharing the specs and the pictures with us. Dave... Jason Brady wrote: > Hi All, > > Finished building my first seismometer last weekend. It's the familiar > Lehman design based on instructions, ideas and information from PSN and > other resources on the 'Net. Several rather grainy pictures can be seen > at http://home.comcast.net/~jr_brady/index.html (temp URL). Sorry about > that; I really must purchase a better digital camera... > > The seismometer is built on a 12" x 36" solid aluminum base anchored to > the concrete floor. 1" square hollow aluminum tubing forms the upright > apparatus and supports. The boom is 1/2" square aluminum rod, 30" long, > > with a 5 pound lead mass. The pivot is a ball bearing/polished bolt > head > combination. Guitar wire and turnbuckle forms the suspension. I > custom- > wound the coil using almost 1 pound of #34 magnet wire. Coil impedance > is 1.9K ohms. The magnet is standard Alnico bridge with 35-pound pull. > Boom stops, component mounting brackets, etc. are formed from 1/2" flat > aluminum stock 1/8" thick. Used brass hardware throughout. > > No damping yet in place. I'm fine-tuning the period and centering and > want to give it some time to settle before damping. About a 15 second > period seems to be the maximum obtainable thus far. Note the DIP socket > mounted on a small piece of perfboard to the left of the BNC connector > to > allow easy insertion of a resistor across the coil output. I also > attached > a copper vane for oil damping if the resistive approach doesn't work. > Even > made provision for mounting eddy current damping hardware (the beauty of > working with soft metals like aluminum--easily cut, drilled, tapped). > > I attached the device to Larry Cochrane's Amplifier/Filter and ADC. The > undamped sensitivity is amazing! Gently stepping across the floor a > good > distance away sets the boom in motion. Will be interesting to see how > it > responds to true seismic events once properly damped. I missed the > recent > Alaska quake, but being near the Juan de Fuca fault/subduction zone I > hope > to record a decent amount of activity. > > Any comments or suggestions on the design, construction, etc.? > > Thanks, > Jason Brady Lynnwood, WA USA > > __________________________________________________________ > > 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)