Subject: VLF Quakes? From: "David Saum" DSaum@............ Date: Mon, 1 Apr 2002 14:03:00 -0500 From 3/28 Seattle Times: http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html) Thursday, March 28, 2002 - 11:15 a.m. Pacific Feel that? If not, it may be a silent quake By Eric Sorensen Seattle Times science reporter ELLENSBURG - Western Washington is in the midst of an earthquake and a rather sizeable one, but have no fear: it's silent. Researchers at Central Washington University, reporting in tomorrow's issue of the journal Science, say the region has in fact gone through eight "silent earthquakes" since 1992. One in August 1999 released the energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8 Nisqually quake. But because the quakes stretch out over six to eight weeks, their energy is dissipated and barely noticeable. " 'Slow earthquake' is the other term that's been widely used for these," said Meghan Miller, a CWU geologist and lead author of the paper. "The earthquake thing is probably a little bit of a misnomer because there's no real shaking associated with the event. But that's what they're called and I kind of like the 'silent earthquake.' It's poetic." Miller and her colleagues were inspired by work published in Science last year by Herb Dragert, a research scientist with the Geological Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on measurements taken at global-positioning sensors arrayed from Seattle to Neah Bay and on the southern half of Vancouver Island. Ordinarily, the sensors show Western Washington creeping eastward about one-half of an inch a year. This is because the oceanic Juan de Fuca plate is moving east and under the North American Continental plate, forcing the continental plate to compress and move east. But every 14 months or so, the compression in the continental plate eases and rebounds westward. This would be a problem if it rebounded all at once, letting loose a fast, powerful tremor in the upper plate and beneath the major population centers of Vancouver, B.C., Seattle and Portland. But researchers theorize that the movement of silent quakes takes place in a deep, warm and well-lubricated section of the Cascadia fault - where the two plates meet - avoiding the jerky motion that happens when more shallow, cold and stickier portions of the fault give way. The most recent silent quake began on Feb. 7 near Friday Harbor and has been spreading across the region for weeks. The quake is at least magnitude 6, Miller said. Researchers say understanding these quakes gives them a new tool for monitoring the Cascadia fault and how it can cause large earthquakes. While it probably won't help them predict when earthquakes will happen, it should help them prepare for the next large earthquake with better building codes and other safety measures in areas most likely to be affected. Eric Sorensen can be reached at 206-464-8253 or esorensen@................. ------ ....David Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: VLF Quakes? From: "Larry Conklin" lconklin@............ Date: Mon, 1 Apr 2002 14:14:05 -0500 Hi Dave, I found your post particuarly interesting. My sister-in-law lives in Olympia, WA, only a few miles from the Nisqualy quake epicenter. Fortunately, she didn't have any significant damage, despite the fact that her house is on the side of a hill. When the not so silent quake occurred, I was worried the the whole house might have ended up at the bottom of the hill. Larry ----- Original Message ----- From: "David Saum" To: Sent: Monday, April 01, 2002 2:03 PM Subject: VLF Quakes? > From 3/28 Seattle Times: > http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html) > > Thursday, March 28, 2002 - 11:15 a.m. Pacific > > Feel that? If not, it may be a silent quake > > By Eric Sorensen > Seattle Times science reporter > > ELLENSBURG - Western Washington is in the midst of an earthquake and a > rather sizeable one, but have no fear: it's silent. > Researchers at Central Washington University, reporting in tomorrow's > issue of the journal Science, say the region has in fact gone through > eight "silent earthquakes" since 1992. One in August 1999 released the > energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8 > Nisqually quake. But because the quakes stretch out over six to eight > weeks, their energy is dissipated and barely noticeable. > > " 'Slow earthquake' is the other term that's been widely used for > these," said Meghan Miller, a CWU geologist and lead author of the > paper. "The earthquake thing is probably a little bit of a misnomer > because there's no real shaking associated with the event. But that's > what they're called and I kind of like the 'silent earthquake.' It's > poetic." > > Miller and her colleagues were inspired by work published in Science > last year by Herb Dragert, a research scientist with the Geological > Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on > measurements taken at global-positioning sensors arrayed from Seattle to > Neah Bay and on the southern half of Vancouver Island. > > Ordinarily, the sensors show Western Washington creeping eastward about > one-half of an inch a year. This is because the oceanic Juan de Fuca > plate is moving east and under the North American Continental plate, > forcing the continental plate to compress and move east. But every 14 > months or so, the compression in the continental plate eases and > rebounds westward. > > This would be a problem if it rebounded all at once, letting loose a > fast, powerful tremor in the upper plate and beneath the major > population centers of Vancouver, B.C., Seattle and Portland. > > But researchers theorize that the movement of silent quakes takes place > in a deep, warm and well-lubricated section of the Cascadia fault - > where the two plates meet - avoiding the jerky motion that happens when > more shallow, cold and stickier portions of the fault give way. > > The most recent silent quake began on Feb. 7 near Friday Harbor and has > been spreading across the region for weeks. > > The quake is at least magnitude 6, Miller said. > > Researchers say understanding these quakes gives them a new tool for > monitoring the Cascadia fault and how it can cause large earthquakes. > While it probably won't help them predict when earthquakes will happen, > it should help them prepare for the next large earthquake with better > building codes and other safety measures in areas most likely to be > affected. > > Eric Sorensen can be reached at 206-464-8253 or > esorensen@................. > ------ > > ...David Saum > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Silent quakes From: meredithlamb meredithlamb@............. Date: Mon, 01 Apr 2002 13:41:16 -0700 Hi all, Thanks David for the silent quake mention. Checked the web on the "Google" search engine, and come up a number of items on the topic. Some are "PDF" or Adobe form. The SF Gate also has an article: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2002/03/29/MN129869.DTL Meredith Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: VLF Quakes? From: "Scott Schwartz" schwartz_scott@........... Date: Tue, 02 Apr 2002 00:12:54 -0500

hello David.  i think you have me confused with another Scott Schwartz.  fell free to take me off of this list sin ce i have no clue what any of you are talking about.  and you may want to contact your friend Scott Schwartz and get his c orrect email address.

thanks,

scott schwartz (but you knew that already)

From: "David Saum"
Reply-To: psn-l@..............
To:
Subject: VLF Quakes?
Date: Mon, 1 Apr 2002 14:03:00 -0500
From 3/28 Seattle Times:
http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html)
Thursday, March 28, 2002 - 11:15 a.m. Pacific
Feel that? If not, it may be a silent quake
By Eric Sorensen
Seattle Times science reporter
ELLENSBURG - Western Washington is in the midst of an earthquake and a
rather sizeable one, but have no fear: it's silent.
Researchers at Central Washington University, reporting in tomorrow's
issue of the journal Science, say the region has in fact gone through
eight "silent earthquakes" since 1992. One in August 1999 released the
energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8
Nisqually quake. But because the quakes stretch out over six to eight
weeks, their energy is dissipated and barely noticeable.
" 'Slow earthquake' is the other term that's been widely used for
these," said Meghan Miller, a CWU geologist and lead author of the
paper. "The earthquake thing is probably a little bit of a misnomer
because there's no real shaking associated with the event. But that's
what they're called and I kind of like the 'silent earthquake.' It's
poetic."
Miller and her colleagues were inspired by work published in Science
last year by Herb Dragert, a research scientist with the Geological
Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on
measurements taken at global-positioning sensors arrayed from Seattle to
Neah Bay and on the southern half of Vancouver Island.
Ordinarily, the sensors show Western Washington creeping eastward about
one-half of an inch a year. This is because the oceanic Juan de Fuca
plate is moving east and under the North American Continental plate,
forcing the continental plate to compress and move east. But every 14
months or so, the compression in the continental plate eases and
rebounds westward.
This would be a problem if it rebounded all at once, letting loose a
fast, powerful tremor in the upper plate and beneath the major
population centers of Vancouver, B.C., Seattle and Portland.
But researchers theorize that the movement of silent quakes takes place
in a deep, warm and well-lubricated section of the Cascadia fault -
where the two plates meet - avoiding the jerky motion that happens when
more shallow, cold and stickier portions of the fault give way.
The most recent silent quake began on Feb. 7 near Friday Harbor and has
been spreading across the region for weeks.
The quake is at least magnitude 6, Miller said.
Researchers say understanding these quakes gives them a new tool for
monitoring the Cascadia fault and how it can cause large earthquakes.
While it probably won't help them predict when earthquakes will happen,
it should help them prepare for the next large earthquake with better
building codes and other safety measures in areas most likely to be
affected.
Eric Sorensen can be reached at 206-464-8253 or
esorensen@.................
------
...David Saum
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.

Get your FREE download of MSN Explorer at http://exp lorer.msn.com.
Subject: Fw: Memorial Research Fund for Sean Thomas Morrissey From: "Larry Cochrane" cochrane@.............. Date: Tue, 2 Apr 2002 14:41:46 -0800 All, I received this from Chris who got it from Laurie Hausmann at the University. If you are interested in helping out please send the donation directly to the address below. -Larry Cochrane Redwood City, PSN > Sean's family has arranged for a memorial research fund to be started in > Sean's name at the University. It will be an endowed fund, so it should > be in existence forever, with the purpose of providing research funding > for earth science faculty who are unable to obtain external funding. If > anyone in the PSI group would like to make a donation to this, it would > be very much appreciated by the family. Donations can be sent to the > Saint Louis University Tribute Fund, P.O. Box 8005, St. Louis, MO > 63156-9950. Indicate it is for the Sean-Thomas Morrissey Research Fund > in the Earth Sciences --- or just that it is in memory of Sean. Checks > can be made out to Saint Louis University. > > Knowing how hard Sean had to work to get funding, I know that he would > be very pleased that his family is setting up this fund in his name. > Laurie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Fw: Memorial Research Fund for Sean Thomas Morrissey From: ian ian@........... Date: Tue, 02 Apr 2002 16:58:15 -1000 http://www.slu.edu/readstory/newslink/982 Larry Cochrane wrote: >All, > >I received this from Chris who got it from Laurie Hausmann at the >University. If you are interested in helping out please send the donation >directly to the address below. > >-Larry Cochrane >Redwood City, PSN > >>Sean's family has arranged for a memorial research fund to be started in >>Sean's name at the University. It will be an endowed fund, so it should >>be in existence forever, with the purpose of providing research funding >>for earth science faculty who are unable to obtain external funding. If >>anyone in the PSI group would like to make a donation to this, it would >>be very much appreciated by the family. Donations can be sent to the >>Saint Louis University Tribute Fund, P.O. Box 8005, St. Louis, MO >>63156-9950. Indicate it is for the Sean-Thomas Morrissey Research Fund >>in the Earth Sciences --- or just that it is in memory of Sean. Checks >>can be made out to Saint Louis University. >> >>Knowing how hard Sean had to work to get funding, I know that he would >>be very pleased that his family is setting up this fund in his name. >>Laurie >> > > >__________________________________________________________ > >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. > > 
http://www.slu.edu/readstory/new
slink/982
Larry Cochrane wrote:
All,

I received this from Chris who got it from Laurie Hausmann at the
University. If you are interest
ed in helping out please send the donation
directly to the address below.

-Larry Cochrane
Redwood City, PSN

Sean's family has arranged for a memorial research fund to be started in
Sean's name at the University.  It
 will be an endowed fund, so it should
be in existence forever, with the purpose of providing research funding
for earth 
science faculty who are unable to obtain external funding.  If
anyone in the PSI group would like to make a donation to this
, it would
be very much appreciated by the family.  Donations can be sent to the
Saint Louis University Tribute Fund, P.O
. Box 8005, St. Louis, MO
63156-9950.  Indicate it is for the Sean-Thomas Morrissey Research Fund
in the Earth Sciences -
-- or just that it is in memory of Sean.  Checks
can be made out to Saint Louis University.

Knowing how hard Sean had
 to work to get funding, I know that he would
be very pleased that his family is setting up this fund in his name.
Laurie



__________________________________________________________

Public Seismic Network Mailin
g List (PSN-L)

To leave this list email P
SN-L-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.


Subject: Fw: Photo enquiry From: "Larry Cochrane" cochrane@.............. Date: Tue, 2 Apr 2002 21:55:44 -0800 Greeting, Can someone help out Maryann? She needs a photo of someone looking at a seismogram. I already told her about the GIF images she can create on my web site. Please send any information to her directly since she is not on the list. Thanks. -Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Maryann Ballantyne" To: Sent: Monday, April 01, 2002 8:51 PM Subject: Photo enquiry > hello > I have looked at you terrific web page and I am hoping that you can help > me. I work for an independent Australian publishing company called Black > Dog Books and at the moment we are preparing a book for 7 to 9 year olds > about earthquakes. The book is a part of a series of 40 non-fiction > titles called Zebras and will be published in Australia and > internationally late this year. > I was hoping that you may be able to help me with a photograph of a > seismograph/ people looking at a seismograph readout/ an actual > seismograph readout or whatever you think may be useful to illustrate > how a seismograph works. > > We need these pics at 300 DPI. > Thank you in anticipation > Maryann Ballantyner > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Sprengnether digital recorder on ebay From: BOB BARNS royb1@........... Date: Wed, 03 Apr 2002 09:53:34 -0500 Hi, Ebay has a Sprengnether DR-100 digital recorder for sale. http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1089855149 The auction ends 4/9 Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Finding your station coordinates From: John & Jan johnjan@........ Date: Thu, 04 Apr 2002 22:17:33 -0700 This page may be helpful in finding the coordinates of you seismograph station. An even better site is http://terraserver.com/ Cheers, John From Earth Science Site of Week sent Apr. 2: Here's missing URL for LATITUDE/LONGITUDE POSITION FINDER: "Use this resource to identify the latitude and longitude position of any point within the [coterminous] United States. Simply touch the map below to zoom in on the area you select, until you find the precise location. There are 9 zoom levels in all." Audience: All. http://www.juggling.org/bin/un.cgi/map-find I've also included some other useful mapping resources. Mark Francek Professor of Geography and Earth Science Mt. Pleasant, MI 48859 E-Mail: Mark.Francek@......... Phone: (989) 774 7617 Fax: (989) 774-290 Resource Page: http://personal.cmich.edu/~franc1m/homepage.htm John C. Lahr 1925 Foothills Road Golden, CO 80402 Phone: (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Finding your station coordinates From: meredithlamb meredithlamb@............. Date: Fri, 05 Apr 2002 01:07:16 -0700 Hi John, Another excellent web site (if you live in certain U.S. states) is at: http//www.epa.gov/enviro/wme/ One can move the map directional, and the cursor movement reveals the longitude and latitude to help pinpoint along streets roads, highways etc. Meredith Lamb John & Jan wrote: > This page may be helpful in finding the coordinates of you seismograph > station. An even better site is http://terraserver.com/ > > Cheers, > John > > From Earth Science Site of Week sent Apr. 2: > Here's missing URL for > LATITUDE/LONGITUDE POSITION FINDER: "Use this resource to identify the > latitude and longitude position of any point within the [coterminous] > United States. Simply touch the map below to zoom in on the area you > select, until you find the precise location. There are 9 zoom levels in > all." Audience: All. > > http://www.juggling.org/bin/un.cgi/map-find > I've also included some other useful mapping resources. > > Mark Francek > Professor of Geography > and Earth Science > Mt. Pleasant, MI 48859 > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Finding your station coordinates From: Hammonds hammond@........... Date: Fri, 05 Apr 2002 05:10:04 -0900 My favorite is http://www.topozone.com which displays topographic maps in various scales as well as cursor readout of lat/long in UTM ,decimal and degree formats. Topo maps are available for all 50 states. Bob Hammond APSN, Fairbanks http://apsn.awcable.com At 11:07 PM 4/4/02, you wrote: >Hi John, > >Another excellent web site (if you live in certain U.S. states) >is at: >http//www.epa.gov/enviro/wme/ >One can move the map directional, and the cursor movement >reveals the longitude and latitude to help pinpoint along streets >roads, highways etc. > >Meredith Lamb > > >John & Jan wrote: > > > This page may be helpful in finding the coordinates of you seismograph > > station. An even better site is http://terraserver.com/ > > > > Cheers, > > John > > > > From Earth Science Site of Week sent Apr. 2: > > Here's missing URL for > > LATITUDE/LONGITUDE POSITION FINDER: "Use this resource to identify the > > latitude and longitude position of any point within the [coterminous] > > United States. Simply touch the map below to zoom in on the area you > > select, until you find the precise location. There are 9 zoom levels in > > all." Audience: All. > > > > http://www.juggling.org/bin/un.cgi/map-find > > I've also included some other useful mapping resources. > > > > Mark Francek > > Professor of Geography > > and Earth Science > > Mt. Pleasant, MI 48859 > > > > >__________________________________________________________ > >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: LIVE ATV COMPARISONS OF INCOMING QUAKES From: "Frank Cooper" fxc@....... Date: Sun, 7 Apr 2002 19:06:38 -0500 Hello all, John Cole and I (Frank Cooper) have for several years been making live television (amateur fast scan television --- ATV) comparisions of the incoming seismic waves of earthquakes in progress. John lives in Pearland, Texas, USA and I live in Friendswood, Texas, USA. --- 11 miles distant from each other. We use fast scan TV (amateur television) to make comparisons of the seismic waves as they are shown on our chart recorders or computer monitors. We keep a running commentary about the possible epicenter, comments about the wave forms, etc. That makes amateur seismology and amateur television a lot more interesting. For the first time we have pictures on our respective web sites related to this activity and I thought perhaps the group might be interested. The pictures on the web sites of the TV monitors show the incoming seismic waves from this afternoon's 4.6M REVILLA GIGEDO ISLANDS REGION quake. My amateur radio web radio W5VID site (where pictures are posted) is at: http://pages.prodigy.net/fxc/W5VID.html My amateur seismology web site (the ATV pictures are not posted on this site) is at: http://pages.prodigy.net/fxc/ John's amateur seismology web page (where pictures are posted) is at: http://pages.prodigy.net/fxc/JC.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Filter/Amplifier From: "Randall Pratt" randallpratts@.......... Date: Sat, 13 Apr 2002 22:10:00 -0500 Hi, Does anyone have troubleshooting experience with the filter final amp = section of the PSN circuit? After 2 1/2 years of operation I began to = notice strange signals in my records. Now I can only get a full scale = reading either + or - with a very small change of the centering 50K pot. = I removed the pot thinking it was bad but I can't detect any shorts or = bad spots over the range of adjustment. If I remove the OP27 from its = socket the AD reads a steady 2 and responds properly to various voltages = applied directly to the output pin of the OP27 socket. I have the input = shorted to ground and I have tried removeing the LF 353 with no change. = I have also swapped the OP27 with another with the same result.=20 Randy
Hi,
 
Does anyone have troubleshooting = experience with=20 the filter final amp section of the PSN circuit?  After 2 1/2 years = of=20 operation I began to notice strange signals in my records.  Now I = can only=20 get a full scale reading either + or - with a very small change of the = centering=20 50K pot.  I removed the pot thinking it was bad but I can't detect = any=20 shorts or bad spots over the range of adjustment.  If I remove the = OP27=20 from its socket the AD reads a steady 2 and responds properly to=20 various voltages applied directly to the output pin of the OP27=20 socket.  I have the input shorted to ground and I have tried = removeing the=20 LF 353 with no change.  I have also swapped the OP27 with another = with the=20 same result. 
 
Randy  
Subject: RE: Filter/Amplifier From: steve hammond shammon1@............. Date: Sun, 14 Apr 2002 10:31:33 -0700 http://pw2.netcom.com/~shammon1/equip.htm are you talking about the amp at the bottom of this page or like this one this is the steps I follow? Check the seismograph for spider webs. Check the connections for dampness and water damage. If you can, try to split amp into stages without disconnecting the system. Pre amps , filter and leveling. I use jumper wires and connect the stages into the A/D. These are the steps I follow trying to get an amp back to life. (1) Check the power supply by running the amps on battery for awhile. Check all the resisters with a meter looking for damage. The 100 ohm power resisters feeding the +/- 12V to the op amps will crack once in a blue moon. Look and probe for loss or bad solder connections on the board. Time and moisture damage will cause all sorts of errors. Did the error go away? NO-- (2) Op 27 have a tendency to respond as you described below when they are going out. Use a jumper wire to skip around each op amp stage and see if the error goes away. See if you can isolate the error by splitting the pre amps from the filter/AC/level gain stage. Did you get it down to one of two stages? Replace the OP amps in that stage. Did the error go away? replace op amps/ repare {} NO-- (3) Replace the two op27's in the pre amp section. If there is any question, replace them a second time. This is the most common source of noise. Try using a different pair of op-amps. Make certain this is not the source of your error. Did the error go away? replace op amps/ repare {} NO-- (4) Jumper around the 3-poll filter and the AC coupling cap op amp(s) connecting the input wire of the 3-poll filter to the input of the leveling and gain section. Did the error go away? replace op amps/ repare {} NO-- (5) Replace the op-amp for the level/gain. Did the error go away? replace op amps/ repare {} NO-- In the next step you will use fixed value resisters to parallel (or jumper around) the two pots. Don't just use a jumper wire. (6) spot solder the 50K pot with two 25K resister across the wipers of pot. (Common in most pots is the center connection) You won't be able to level the output but if the error goes away the pot is bad. (7) In the gain stage I use a 100k pot. Spot solder a 100k resister across the wiper to common of the pot setting the pot to max gain. If the error goes way the pot is bad. (8) Replace the AC coupling cap. (9) Go back to the pre-amp and start replacing the caps. Steve Hammond PSN Aptos, CA -----Original Message----- From: Randall Pratt [SMTP:randallpratts@........... Sent: Saturday, April 13, 2002 8:10 PM To: psn-l@.............. Subject: Filter/Amplifier Hi, Does anyone have troubleshooting experience with the filter final amp section of the PSN circuit? After 2 1/2 years of operation I began to notice strange signals in my records. Now I can only get a full scale reading either + or - with a very small change of the centering 50K pot. I removed the pot thinking it was bad but I can't detect any shorts or bad spots over the range of adjustment. If I remove the OP27 from its socket the AD reads a steady 2 and responds properly to various voltages applied directly to the output pin of the OP27 socket. I have the input shorted to ground and I have tried removeing the LF 353 with no change. I have also swapped the OP27 with another with the same result. Randy << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New release of WinQuake From: "Larry Cochrane" cochrane@.............. Date: Sun, 14 Apr 2002 16:04:04 -0700 Hi All, I have a new release of WinQuake available on my web site. You can download it from here http://www.seismicnet.com/software.html. The version number is 2.8.8. The main reason for this release is to sync up the documentation with the program. Over the last year I have made several changes to the software without updating the documentation. I now have the documentation up to date. You can view it online here http://www.seismicnet.com/wqdocs/winquake.html or on your computer after installing the new release. Besides updating the documentation I fixed a few bugs and made a few improvements. You can now have the program associate the file type of .psn to WinQuake. By associating the file extension of .psn to WinQuake, whenever you click on a file or web link ending in .psn, WinQuake will be opened and the event file displayed in the event window. The first time you start this version you will be asked if you want to associate the .psn file type. If you answer no you can do it at a later time by using the File / Associate PSN File menu items. This menu item will be disable if the association information in the system registry is up to date. One other change I made is in the Time Domain filtering dialog box. You can now select both the highpass and lowpass filter check boxes. By checking both you will essentially be doing a bandpass filter. The one bug I remember fixing is in the event window code. The program would hang if this window was made very small. Thanks it... -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Filter/Amplifier From: "Randall Pratt" randallpratts@.......... Date: Sun, 14 Apr 2002 16:45:22 -0500 Steve, Thanks for help. I was quite certain it was in the final OP27 stage of the circuit you referenced. I started resoldering and found the connection to pin 6 to be the culprit. I don't have all back together but the last 2 stages and the AD are running fairly quietly now for a couple of hours. While on the noise subject, I have readings up to about 15 counts from just the LF353 and the last OP27 with a jumper across the input in front of the 3 pole filter. With the OP27 removed the AD sits at a steady 2. Is this about what I should experience? I have a 5K pot for gain set about half or a little more. The noise doesn't seem to have a particular frequency on the fft. Randy ----- Original Message ----- From: "steve hammond" To: Sent: Sunday, April 14, 2002 12:31 PM Subject: RE: Filter/Amplifier > http://pw2.netcom.com/~shammon1/equip.htm are you talking about the amp at > the bottom of this page or like this one this is the steps I follow? Check > the seismograph for spider webs. Check the connections for dampness and > clip __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Questions on VAN From: SW6079@....... Date: Mon, 15 Apr 2002 22:07:46 EDT I've been reading a very interesting book on e-quake prediction based on the VAN method of detecting precursor signals, they apparently use a fairly simple system connected to voltage amplifiers much like the type we employ for lehman's etc. Does anyone know of success in the states w/ this? Tnx, Mike. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN From: Bob Fryer bfryer@............ Date: Tue, 16 Apr 2002 10:10:07 -0700 Hello Mike, What book is that? I'm not aware of anyone using the VAN method in the USA, however they are working with it in Japan and China. The ELFrad Group here is getting some interesting signals. www.elfrad.com Some private researchers here are using a simple volttage tester hooked to two electrodes buried in the ground to measure earth currents. One, in the San Andreas Rift Zone of NE L.A. county is getting some interesting readings that appear to be precursors. The voltage drops to zero briefly, several times over a period of five or so minutes. I can send you a description of at least one such incident. Also, I was there and witnessed it once myself, about two years ago. [Note: Since there is no recording system, it is out in the yard in a weatherproof box, and it has been witnessed perhaps half a dozen or more times over about six years, it must happen fairly frequently.] The set-up is described on page 125 of "When The Snakes Awake" by Prof Helmut Tributsch, MIT Press, 1982. If you don't have the book, I can send you the relevent text by private E-mail. There may still be a website available showing materials used, etc. Somewhere I have a reference to a similar voltage drop recorded by scientists in Southern Calif. Bob Fryer, Beaverton, Oregon >I've been reading a very interesting book on e-quake prediction based on the >VAN method of detecting precursor signals, they apparently use a fairly >simple system connected to voltage amplifiers much like the type we employ >for lehman's etc. Does anyone know of success in the states w/ this? Tnx, >Mike. >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > -- earthquake WARNING research Animals, People, Scientific Evidence www.earthquakewarning.org __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN (reply to Bob ) From: SW6079@....... Date: Tue, 16 Apr 2002 21:05:55 EDT Hi Bob, The book is "Earthquake Prediction" by Haroun Tazieff. Very well written. However it is sparse on the actual layout of sensors and amplification required. It contains a fascinating theory of why it works so well also. They claim 90% success for regions that have been "calibrated", that is, one or more seismic signals have been received that indicate how a region "responds" These fellows have been around and have been having success in several European countries since about the mid '80s. Sure would like to give it a try. In WA there are several regions that are regularly active. Mike. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN From: "Erich Kern" efkern@............. Date: Tue, 16 Apr 2002 19:27:08 -0700 Hi All, For a long list of VAN references, links and books, I just went to www.google.com In the advanced search box type in van+earthquake no spaces, and use the + sign as shown, select the box "30 results". In the box below, select English, otherwise you'll get references in Greek (the VAN guys were Greek scientists) hit Google Search, and you'll have more references to VAN than you can use. Regards, Erich Kern ----- Original Message ----- From: "Bob Fryer" To: Sent: Tuesday, April 16, 2002 10:10 AM Subject: Re: Questions on VAN Hello Mike, What book is that? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN (reply to Bob ) From: Bob Fryer bfryer@............ Date: Wed, 17 Apr 2002 00:46:47 -0700 Hello Mike, Erich, Yes, that is a good book for what it covers. That and many more are covered in the various "Resources" on my website (see below). Erich, I have many of the items -- except the most recent ones. Lots of time copying articles at university libraries. If we want to continue this, it should probably be by private E-mail. Take care, Bob Fryer >Hi Bob, The book is "Earthquake Prediction" by Haroun Tazieff. Very well >written. However it is sparse on the actual layout of sensors and >amplification required. It contains a fascinating theory of why it works so >well also. They claim 90% success for regions that have been "calibrated", >that is, one or more seismic signals have been received that indicate how a >region "responds" These fellows have been around and have been having >success in several European countries since about the mid '80s. Sure would >like to give it a try. In WA there are several regions that are regularly >active. Mike. -- earthquake WARNING research Animals, People, Scientific Evidence www.earthquakewarning.org __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: accelerometer on ebay From: BOB BARNS royb1@........... Date: Wed, 17 Apr 2002 11:52:37 -0400 Hi gang, Ebay is showing a Kinemetrics Force Balance Accelerometer #FBA3 Item # 1721771709 First bid US $110.00 Ends Apr-18-02 13:10:20 PDT I have no idea what this might be good for. Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: accelerometer on ebay From: Doug Crice dcrice@............ Date: Wed, 17 Apr 2002 07:38:43 -0700 The FBA-3 is a 3-component accelerometer with a range of perhaps 1/2 to 1 g acceleration. It was used in combination with a digital data acquisition system to record vibrations from strong earthquakes. Typcially, systems would be installed in the basement, roof, and middle of a building to record the structural response to earthquakes. Variations were used in boreholes to study ground spectral amplification ratios and as parts of systems in other sturctures. The FBA-3 has no practical purpose in recording small or distant earthquake. BOB BARNS wrote: > > Hi gang, > Ebay is showing a Kinemetrics Force Balance Accelerometer #FBA3 > Item # 1721771709 > First bid US $110.00 > Ends Apr-18-02 13:10:20 PDT > I have no idea what this might be good for. > Bob > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Drum plotter for Dataq users From: Bobhelenmcclure@....... Date: Fri, 19 Apr 2002 23:15:31 EDT Hi everyone, Since I would enjoy having others appreciate and enjoy the fruits of my recent hard labor, I am offering to share free my drum plot program with others having the same hobby. I warrant that the program is not malicious, but will take no responsibility if fails to live up to your expectations. It does fully live up to mine, and has proved to be very useful. With its built-in filters, I can record teleseisms of magnitude 6.5 or more, and accurately reproduce L waves of 24 seconds period, even though my antique Strengnether seismometer has a natural period of only 3.5 seconds. This VisualBasic6.0 program presents seismic data in a 24hr format, starting at the first hour recorded, using WDQ files recorded by Dataq hardware and software (DI-194 Acquisition). The format is very similar to that seen on the LDEO-LDSN Data Repository website: http://www.ldeo.columbia.edu/~wykim/LCSN/lcsn.html An expanded plot capaibility is provided, the starting time determined by a mouse click on the desired time on the drum plot. Filtered copies of the original file can be saved by a mouse click. Filter options include high pass, smooth, long period, and broadband, with user controlled filter parameters. For most accurate long period and broadband response, the user must input the period and damping of the sensor. A most useful feature of this program is its ability to display filtered seismic data as the raw data is being recorded. When a file currently open for recording is selected, the drum plot is updated as often as new data is recorded to the file (every 256 data samples). The user has almost instant knowledge of a seismic event when it occurs. The ability to examine the detailed waveform plot is retained as well. This program is not available in installable form. Simply run the file as is. It usually will run without requiring more system files on Windows98 or later. Using my sample files, you won't even need the Dataq hardware and software to try it out. You can order the A/D board and WindaQ Lite software from DataQ.com for about $15. You will need a very stable low-pass DC amplifier delivering at least +-4.5v to drive the DataQ board. Matching this program up to the characteristics of your particular sensor and sampling rate may require some program changes, which I am willing to do for you. I could also adapt this program to read any other data file format. If you have an interest, please e-mail me for a more detailed description of the program. Also, describe what equipment you are using. If you have any experience in VisualBasic programming, say so. I might want to give you the source code, so I won't have to help you every time you need it. Bob McClure bobhelenmcclure@....... Hi everyone,

  Since I would enjoy having others appreciate and enjoy the fruits of my recent hard labor, I am offering to sh are free my drum plot program with others having the same hobby.  I warrant that the program is not malicious, but will ta ke no responsibility if fails to live up to your expectations.  It does fully live up to mine, and has proved to be very u seful. With its built-in filters, I can record teleseisms of magnitude 6.5 or more, and accurately reproduce L waves of 24 seco nds period, even though my antique Strengnether seismometer has a natural period of only 3.5 seconds.

 This VisualBasic6.0 program presents seismic data in a 24hr format, starting at the first hour recorded, using WDQ f iles recorded by Dataq hardware and software (DI-194 Acquisition).  The format is very similar to that seen on the LDEO-LD SN Data Repository website:

     http://www.ldeo.columbia.edu/~wykim/LCSN/lcsn.html

 An expanded plot capaibility is provided, the starting time determined by a mouse click on the desired time on the d rum plot.  Filtered copies of the original file can be saved by a mouse click.  Filter options include high pass, smo oth, long period, and broadband, with user controlled filter parameters.  For most accurate long period and broadband resp onse, the user must input the period and damping of the sensor.

 A most useful feature of this program is its ability to display filtered seismic data as the raw data is being recor ded.  When a file currently open for recording is selected,  the drum plot is updated as often as new data is recorde d to the file (every 256 data samples).  The user has almost instant knowledge of a seismic event when it occurs.  Th e ability to examine the detailed waveform plot is retained as well.

 This program is not available in installable form.  Simply run the file as is.  It usually will run withou t requiring more system files on Windows98 or later.  Using my sample files, you won't even need the Dataq hardware and so ftware to try it out.  You can order the A/D board and WindaQ Lite software from DataQ.com for about $15.  You will n eed a very stable low-pass DC amplifier delivering at least +-4.5v to drive the DataQ board.

 Matching this program up to the characteristics of your particular sensor and sampling rate may require some program changes, which I am willing to do for you.  I could also adapt this program to read any other data file format.

 If you have an interest, please e-mail me for a more detailed description of the program.  Also, describe what equipment you are using.  If you have any experience in VisualBasic programming, say so.  I might want to give you th e source code, so I won't have to help you every time you need it.

Bob McClure
bobhelenmcclure@....... Subject: Re: Drum plotter for Dataq users From: John Lahr johnjan@........ Date: Fri, 19 Apr 2002 22:37:02 -0600 Hi Bob,

This sounds like a great program.  I would like to try it out with your test data.

I don't have a DI-194, but do have the DI-154 unit.  Do you think it will work with this
format as well?  I think the 12 bit AD will be helpful, although the price is $150
(100 with an educational discount).

Cheers,
John

At 11:15 PM 4/19/2002 -0400, you wrote:
Hi everyone,

  Since I would enjoy having others appreciate and enjoy the fruits of my recent hard labor, I am offering to share free my drum plot program with others having the same hobby.  I warrant that the program is not malicious, but will take no responsibility if fails to live up to your expectations.  It does fully live up to mine, and has proved to be very useful. With its built-in filters, I can record teleseisms of magnitude 6.5 or more, and accurately reproduce L waves of 24 seconds period, even though my antique Strengnether seismometer has a natural period of only 3.5 seconds.

 This VisualBasic6.0 program presents seismic data in a 24hr format, starting at the first hour recorded, using WDQ files recorded by Dataq hardware and software (DI-194 Acquisition).  The format is very similar to that seen on the LDEO-LDSN Data Repository website:

     http://www.ldeo.columbia.edu/~wykim/LCSN/lcsn.htm l

 An expanded plot capaibility is provided, the starting time determined by a mouse click on the desired time on the drum p lot.  Filtered copies of the original file can be saved by a mouse click.  Filter options include high pass, smooth, long period, and broadband, with user controlled filter parameters.  For most accurate long period and broadband response, the user must input the period and damping of the sensor.

 A most useful feature of this program is its ability to display filtered seismic data as the raw data is being recorded.& nbsp; When a file currently open for recording is selected,  the drum plot is updated as often as new data is recorded to the file (every 256 data samples).  The user has almost instant knowledge of a seismic event when it occurs.  The abi lity to examine the detailed waveform plot is retained as well.

 This program is not available in installable form.  Simply run the file as is.  It usually will run without req uiring more system files on Windows98 or later.  Using my sample files, you won't even need the Dataq hardware and softwar e to try it out.  You can order the A/D board and WindaQ Lite software from DataQ.com for about $15.  You will need a very stable low-pass DC amplifier delivering at least +-4.5v to drive the DataQ board.

 Matching this program up to the characteristics of your particular sensor and sampling rate may require some program chan ges, which I am willing to do for you.  I could also adapt this program to read any other data file format.

 If you have an interest, please e-mail me for a more detailed description of the program.  Also, describe what equip ment you are using.  If you have any experience in VisualBasic programming, say so.  I might want to give you the sou rce code, so I won't have to help you every time you need it.

Bob McClure
bobhelenmcclure@.......

John C. Lahr
1925 Foothills Road
Golden, CO 80402
Phone: (303) 215-9913 
john@........
http://lahr.org/john-jan/science.html Subject: Morning Shake? From: Stephanie Gilgut steph@................. Date: Sat, 20 Apr 2002 06:29:53 -0400 (EDT) Hi all, I was wondering if anyone picked up a short n/s shake somewhere this AM (Saturday) near 7 AM EST. I'm located near Albany, NY. The bed, and things in the room were doing a short back and forth 2 step. Not enough to topple things but definitely quite noticeable. Duration was about 30 secs. Thanks, Steph -- Ms. Stephanie Gilgut - President SGE, inc. 225 River St. Troy, NY. 12180 voice: (518) 271-8079 fax: (518) 271-6289 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Morning Shake? From: "Marchal van Lare" vanlare@............. Date: Sat, 20 Apr 2002 13:45:50 +0200 According to Redpuma : 20Apr2002 10:50:42.0 43.0N 75.0W 10 mb=5.5 A*LED NEW YORK 1107 20Apr2002 10:51:50.2 50.7N 64.7W 10 mb=5.5 A*SED EASTERN QUEBEC, CANADA 1107 Marchal -----Oorspronkelijk bericht----- Van: psn-l-request@.............. [mailto:psn-l-request@..................... Stephanie Gilgut Verzonden: zaterdag 20 april 2002 12:30 Aan: psn-l@.............. Onderwerp: Morning Shake? Hi all, I was wondering if anyone picked up a short n/s shake somewhere this AM (Saturday) near 7 AM EST. I'm located near Albany, NY. The bed, and things in the room were doing a short back and forth 2 step. Not enough to topple things but definitely quite noticeable. Duration was about 30 secs. Thanks, Steph -- Ms. Stephanie Gilgut - President SGE, inc. 225 River St. Troy, NY. 12180 voice: (518) 271-8079 fax: (518) 271-6289 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Fwd: M 5.1 EQ in NEW YORK Z= 5km Sat Apr 20 10:50:44 2002 UTC From: John Lahr johnjan@........ Date: Sat, 20 Apr 2002 05:53:09 -0600 Here's the USGS location, in case you are not subscribed to the Bigquake list. For more details see: http://neic.usgs.gov/neis/bulletin/neic_deam.html and if you felt it, use the link on that page to provide some information that will be automatically posted. Cheers, John >Mailing-List: contact bigquake-help@.................. run by ezmlm >X-No-Archive: yes >List-Help: >List-Unsubscribe: >List-Subscribe: >Delivered-To: mailing list bigquake@................. >Date: Sat, 20 Apr 2002 05:35:39 -0600 (MDT) >Subject: M 5.1 EQ in NEW YORK Z= 5km Sat Apr 20 10:50:44 2002 UTC >44.51N 73.66W >From: Do_Not_Reply@................... > > This information is provided by the USGS > National Earthquake Information Center. > (Address problems to: sedas@.................... > >These parameters are preliminary and subject to revision. > >A magnitude 5.1 earthquake in NEW YORK has occurred at: >44.51N 73.66W Depth 5km Sat Apr 20 10:50:44 2002 UTC > >Time: Universal Time (UTC) Sat Apr 20 10:50:44 2002 > Eastern Daylight Time (EDT) Sat Apr 20 06:50:44 2002 > Central Daylight Time (CDT) Sat Apr 20 05:50:44 2002 > Mountain Daylight Time (MDT) Sat Apr 20 04:50:44 2002 > Pacific Daylight Time (PDT) Sat Apr 20 03:50:44 2002 > Alaska Daylight Time (ADT) Sat Apr 20 02:50:44 2002 > Hawaii Standard Time (HST) Sat Apr 20 00:50:44 2002 > >Location with respect to nearby cities: > 15 miles (25 km) SW of Plattsburgh, New York (pop 21,000) > 20 miles (35 km) W of Burlington, Vermont (pop 39,000) > 55 miles (90 km) WNW of MONTPELIER, Vermont (pop 8,000) > 130 miles (205 km) N of ALBANY, New York > >For additional information and subsequent updates, including >associated information and maps please consult the following >web page, which will be available shortly: >http://neic.usgs.gov/neis/bulletin/neic_deam.html . > >For the most significant earthquakes, information may also be >available from the USGS Earthquake Hazards Program home page at >http://earthquake.usgs.gov/ and the USGS home page at >http://www.usgs.gov/ . > >You will continue to receive messages like this when >earthquakes occur that have magnitude 5.5 or greater >anywhere in the world OR 4.5 or greater in the contiguous >US, Hawaii, and Alaska (excluding the Aleutian Islands). > >The subscription form for this service is located at: >http://neic.usgs.gov/neis/data_services/data_services.html >If you do not wish to receive these messages, please visit >that site, select "bigquake," enter your Email address, and select, >"unsubscribe." >-- >U.S. Geological Survey -- Science for a Changing World * John C. and Jan H. Lahr * JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * Phone: (303) 215-9913 * http://lahr.org/john--jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Plattsburgh Earthquake From: John Lahr johnjan@........ Date: Sat, 20 Apr 2002 06:13:31 -0600 This map shows the distribution of historic northeastern seismicity: http://greenwood.cr.usgs.gov/pub/i-maps/i-2737/ The intensity map is has 1,077 responses so far: http://pasadena.wr.usgs.gov/shake/ne/STORE/Xdeam/ciim_display.html John John C. Lahr lahr@........ (work) john@........ (home) Central Region Geologic Hazards Team U.S. Geological Survey PO Box 25046 Denver, CO 80225 Work: Phone (303) 273-8596 FAX (303) 273-8600 Home: Phone (303) 215-9913 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Plattsburgh Earthquake From: Stephanie Gilgut steph@................. Date: Sat, 20 Apr 2002 07:36:00 -0400 (EDT) Thanks, folks. There have been some "was that a shake?" events in my past years, but nothing I was positive about. This one I was 90% sure. Thanks for the pointers and info. Steph -- Ms. Stephanie Gilgut - President SGE, inc. 225 River St. Troy, NY. 12180 voice: (518) 271-8079 fax: (518) 271-6289 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re; Plattsburgh Earthquake From: "Larry Conklin" lconklin@............ Date: Sat, 20 Apr 2002 09:24:51 -0400 This morning's quake woke my wife and me out of a sound sleep. A very definite gentle shaking of the bed. I am running a Shackleford-Gunderson sensor, based on Larry Cochrane's board. The sensor is oriented east-west. The high frequency channel saturated for a good part of the record, and the L channel went sort of crazy during the same interval. Too much of a good thing, I guess. Larry Conklin lconklin@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Drum plotter for Dataq users From: Bobhelenmcclure@....... Date: Sat, 20 Apr 2002 19:35:09 EDT To those inquiring about my program: DrumPlot is not a data acquisition program. It can only read, filter, and display data files that are acquired using Dataq hardware and software. I use the DI-194 starter kit and the software supplied with the board. The files generated have the extension WDQ. The DI-194 samples data at at a fixed rate of 240 s/s with 8-bit conversion. It appears to have more precision at slower sampling rates because the Dataq acquisition program averages all the data points sampled at the 240/s rate that fall within the slower recorded sampling interval. This works pretty well for me, since I sample at 5 s/s, get the benefit of the average of 48 actual samples per recorded sample, which, if the signal is dynamic enough, washes out the quantitization error. For sensors with very short natural periods, such as geophones, you must sample at higher rates than 5 s/s, and will end up closer to the basic 8-bit resolution than the DI-194 will provide. For more resolution, you need the DI-154 with 12-bit resolution at 240 s/s, so you still have at least 12 bits at any rate, and an effective maximum of 14 bits at lower recorded rates. This is still less than one might wish for. You also get a little less for your money now. Dataq raised the price of the DI-194 from less than $15 to $24. The DI-154 went from about $100 to $150 (+$8.55 shipping). The filters in my program can still be used at high sampling rates on a short period instrument, but the default time constants I use will have to be reduced. If you can get the program to work in the way you desire with user input time constants, I can furnish a revised program with different defaults, or change the program to remember your defaults in a setup operation. Also note that the inverse filter used to extend the effective period is based on the passive type of sensor, whose output voltage is proportional to the velocity of a damped pendulum. Bob McClure bobhelenmcclure@....... To those inquiring about my program:

DrumPlot is not a data acquisition program.  It can only read, filter, and display data files that are acquired using Dataq hardware and software.  I use the DI-194 starter kit and the software supplied with the board.  The files gener ated have the extension WDQ.

 The DI-194 samples data at at a fixed rate of 240 s/s with 8-bit conversion.  It appears to have more precision at slower sampling rates because the Dataq acquisition program averages all the data points sampled at the 240/s rate that fal l within the slower recorded sampling interval.  This works pretty well for me, since I sample at 5 s/s, get the benefit o f the average of 48 actual samples per recorded sample, which, if the signal is dynamic enough, washes out the quantitization e rror.  For sensors with very short natural periods, such as geophones, you must sample at higher rates than 5 s/s, and wil l end up closer to the basic  8-bit resolution than the DI-194 will provide.  For more resolution, you need the DI-15 4 with 12-bit resolution at 240 s/s, so you still have at least 12 bits at any rate, and an effective maximum of  14 bits at lower recorded rates.  This is still less than one might wish for.  You also get a little less for your money now.  Dataq raised the price of the DI-194 from less than $15 to $24.  The DI-154 went from about $100 to $150 (+$8.55 sh ipping).

 The filters in my program can still be used at high sampling rates on a short period instrument, but the default tim e constants I use will have to be reduced.  If you can get the program to work in the way you desire with user input time constants, I can furnish a revised program with different defaults, or change the program to remember your defaults in a setup operation.

 Also note that the inverse filter used to extend the effective period is based on the passive type of sensor, whose output voltage is proportional to the velocity of a damped pendulum.

Bob McClure
bobhelenmcclure@....... Subject: Digital Filter for Seismography From: Bobhelenmcclure@....... Date: Mon, 22 Apr 2002 14:06:23 EDT Hi everyone, Here is something for you to ponder over. Since I am new to the field, what is disclosed here may be old hat to you. Your comments, please. HOW TO DIGITALLY EXTEND THE LONG PERIOD RESPONSE OF A SEISMOMETER R. E. McClure Pseudoscientist Emeritus From the electrical equivalent circuit diagram of an input series capacitor feeding an inductance and a resistance in parallel, the velocity response of a seismometer to ground velocity input is given by: G = 1/(1 - (f0/f)^2 - j*(f0/f)/Q), where f0 is the natural frequency and Q is inversely proportional to the damping of the seismometer pendulum. A Q of 0.5 is the critically damped condition. To achieve a flat filtered response, the compensating filter must have a gain of 1/G, i.e.: Gain = 1 - (f0/f)^2 - j*(f0/f)/Q . The digital implementation of such a filter is accomplished by double summation (integration) of the signal, DataIn: sum1 = sum1 + DataIn sum2 = sum2 + sum1 DataOut = DataIn + (sum1 * sigma0 * deltaT) + (sum2 * (Omega0 * deltaT)^2) ...next data sample, etc. ... where fs = samples per second , deltaT = 1 / fs , Omega0 = 2* PI * f sigma0 = (Omega0 * deltaT) / Q . For practical purposes, this filter is useless. The output very quickly becomes large without limit if there is any dc bias at all in the input data. The next necessary step is to precede the filter with a long time constant dc bias blocking filter. This helps, but is still not sufficient to make a stable filter. The final step is to close the loop on the double integration with feedback to the signal input from both the first and second integration outputs. The coefficients for the feedback make the loop behave like a very long period, damped, pendulum. The resulting output of the filter is equivalant to that obtained from a very long period sensor. This filter is built into DrumPlot.exe. The user inputs the period and damping of the sensor, and the desired filtered period. It works very well. One cannot expect to get more than a ten times improvement in long period response. You will find that the output does not truly reproduce just ground motion. There will the artifacts also appearing, such as that resulting from amplifier bias fluctuation, ambient temperature changes, atmospheric pressure changes, etc. You may also discover that wind has a large effect. I live about 1000 feet from a commuter railroad line. I pick up the vibration of passing trains, filter or no, but with the filter operating at long period, I also detect the slow earth deformation induced by the weight of the passing locomotive! The verbatim listing for the filter in the DrumPlot program is: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 'DRUMPLOT DC-BLOCKING FILTER: samplebare = sample BiasRegister = BiasRegister + samplebare / Tc0 Deltabiasregister = BiasRegister / Tc0 sampleblock = samplebare - BiasRegister BiasRegister = BiasRegister - Deltabiasregister 'DRUMPLOT EXTENDED-PERIOD FILTER: sum1 = sampleblock + sum1 - sum1 * SigmaF - sum2 * Omega2F sum2 = sum2 + sum1 sample = sampleblock + sum1 * SigmaP + sum2 * Omega2P ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The terms Omega2P, SigmaF, Omega2P, and SigmaP are: Omega2P = (OmegaPendulum * sampleperiod)^2 SigmaP = OmegaPendulum / QPendulum Omega2F = (OmegaFilter * sampleperiod)^2 SigmaF = OmegaFilter / QFilter (Set QFilter equal to 0.5) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Another nice benefit of this filter, regardless of whether a long period response is desired or not, is that the output of the seismometer, if its natural period and damping are accurately known, can be converted into one based on a standard model. There will then be a common ground on which to compare waveforms obtained from sensors of different period and damping. Robert E McClure 90 Maple Avenue Locust Valley, NY 11560 bobhelenmcclure@....... Hi everyone,

Here is something for you to ponder over.  Since I am new to the field, what is disclosed here may be old hat to you.  Your comments, please.


   HOW TO DIGITALLY EXTEND THE LONG PERIOD RESPONSE
              OF A SEISMOMETER
               R. E. McClure
          Pseudoscientist Emeritus

 From the electrical equivalent circuit diagram of an input series capacitor feeding an inductance and a resistance i n parallel, the velocity response of a seismometer to ground velocity input is given by:

    G = 1/(1 - (f0/f)^2 - j*(f0/f)/Q),

where f0 is the natural frequency and Q is inversely proportional to the damping of the seismometer pendulum.  A Q of 0.5 is  the critically damped condition.

 To achieve a flat filtered response, the compensating filter must have a gain of 1/G, i.e.:

    Gain = 1 - (f0/f)^2 - j*(f0/f)/Q .

 The digital implementation of such a filter is accomplished by double summation (integration) of the signal, DataIn:

   sum1 = sum1 + DataIn
   sum2 = sum2 + sum1
   DataOut = DataIn + (sum1 * sigma0 * deltaT) + (sum2 * (Omega0 * deltaT)^2)
   ...next data sample, etc. ...

where

   fs = samples per second ,
   deltaT = 1 / fs ,
   Omega0 = 2* PI * f
   sigma0 = (Omega0 * deltaT) / Q .

 For practical purposes, this filter is useless.  The output very quickly becomes large without limit if there i s any dc bias at all in the input data.

 The next necessary step is to precede the filter with a long time constant dc bias blocking filter.  This helps , but is still not sufficient to make a stable filter.

 The final step is to close the loop on the double integration with feedback to the signal input from both the first and second integration outputs.  The coefficients for the feedback make the loop behave like a very long period, damped, p endulum.  The resulting output of the filter is equivalant to that obtained from a very long period sensor.

 This filter is built into DrumPlot.exe.  The user inputs the period and damping of the sensor, and the desired filtered period.  It works very well.  One cannot expect to get more than a ten times improvement in long period resp onse.  You will find that the output does not truly reproduce just ground motion.  There will the artifacts also appe aring, such as that resulting from amplifier bias fluctuation, ambient temperature changes, atmospheric pressure changes, etc.  You may also discover that wind has a large effect.  I live about 1000 feet from a commuter railroad line.  I p ick up the vibration of passing trains, filter or no, but with the filter operating at long period, I also detect the slow eart h deformation induced by the weight of the passing locomotive!

 The verbatim listing for the filter in the DrumPlot program is:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    'DRUMPLOT DC-BLOCKING FILTER:
    samplebare = sample
    BiasRegister = BiasRegister + samplebare / Tc0
    Deltabiasregister = BiasRegister / Tc0
    sampleblock = samplebare - BiasRegister
    BiasRegister = BiasRegister - Deltabiasregister

    'DRUMPLOT EXTENDED-PERIOD FILTER:
    sum1 = sampleblock + sum1 - sum1 * SigmaF - sum2 * Omega2F
    sum2 = sum2 + sum1
    sample = sampleblock + sum1 * SigmaP + sum2 * Omega2P
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 The terms Omega2P, SigmaF,  Omega2P, and SigmaP are:

   Omega2P = (OmegaPendulum * sampleperiod)^2
   SigmaP  = OmegaPendulum / QPendulum

   Omega2F = (OmegaFilter * sampleperiod)^2
   SigmaF  = OmegaFilter / QFilter
   (Set QFilter equal to 0.5)  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 Another nice benefit of this filter, regardless of whether a long period response is desired or not, is that the out put of the seismometer, if its natural period and damping are accurately known, can be converted into one based on a standard m odel.  There will then be a common ground on which to compare waveforms obtained from sensors of different period and damp ing.

Robert E McClure
90 Maple Avenue
Locust Valley, NY 11560
bobhelenmcclure@....... Subject: S. T. Morrissey Obituary From: "ERIC GUINN" GUINNE@........... Date: Wed, 24 Apr 2002 23:10:05 -0400 Saint Louis University published an Obituary of Sean-Thomas Morrissey in the May "Grand Connections" Newsletter. What a loss... http://www.slu.edu/publications/gc/may_02_gc.pdf (page 11) Eric Guinn Sevierville, Tennessee __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: carbon copy From: "Barry" gbl@....... Date: Sun, 28 Apr 2002 16:42:40 -0700 Hi All Pretty quiet lately. I was looking into a Dos based server for the = sensor room. I looked at VNC but it appears to be a guest program. I did = find out about another program called "Carbon Copy". Anyone used this? = It seems to have a windows and dos version. I haven't got the evaluation = version to work on my system. Regards Barry

Hi All
 Pretty quiet lately. I was = looking into a Dos=20 based server for the sensor room. I looked at VNC but it appears to be a = guest=20 program. I did find out about another program called "Carbon Copy". = Anyone used=20 this? It seems to have a windows and dos version. I haven't got the = evaluation=20 version to work on my system. Regards
Barry
Subject: 1906 Quake Books.... From: "Kareem" temp@............. Date: Sun, 28 Apr 2002 21:00:55 -0700 Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem Message
Does anyone know = where I can=20 get any other books on the April 18, '06 Quake & fire of San = Francisco?=20 I'm interested on getting as much information as I can on the buildings = damaged=20 in SF as well as other parts of the bay area.
I already own the = book The=20 Earth Shook and the Sky Burned.
 
Thanks,
Kareem
Subject: Re: carbon copy From: "Francesco" franuc@......... Date: Mon, 29 Apr 2002 08:58:14 +0200 Hello Barry. I use CarbonCopy32 from many years to connect my system onto four remote = stations, sparse in Italy and it's works very fine. It runs under = windows only, but it's able to control a dos application. The new CC32 = edition (5.5) has a very expensive cost....=20 Look at the producer web site (now is Altiris.ltd). Try PCAnywhere. There was an older version of this program, just = created for Dos platform. Regards Francesco - Italy
Hello Barry.
I use CarbonCopy32 from many years to = connect my=20 system onto four remote stations, sparse in Italy and it's works very=20 fine.  It runs under windows only, but it's able to control a dos=20 application.  The new CC32  edition (5.5) has a very expensive = cost.... 
Look at the producer web site (now is=20 Altiris.ltd).
 
Try PCAnywhere.  There was an = older version of=20 this program, just created for Dos platform.
 
Regards
 
Francesco   - =20 Italy
Subject: recording drum on ebay From: BOB BARNS royb1@........... Date: Mon, 29 Apr 2002 09:43:46 -0400 Hi gang, Ebay has a "seismograph recording drum" item # 864881377 The auction ends 5/5. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: recording drum on ebay From: RADIOTEL@....... Date: Mon, 29 Apr 2002 10:51:36 EDT List Members I just purchased a Rockland 1042 Dual Hi/Lo Filter from a gentleman back east (Cleveland) that filters down to .001 HZ. He has three more like it which he will sell for $75.00 each (Including shipping anywhere in the U.S.) or all three for $200.00 (including shipping). As attested to by Bob Barns, these professional filters really work well. Jim Allen __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 1906 Quake Books.... From: steve hammond shammon1@............. Date: Mon, 29 Apr 2002 10:07:21 -0700 For a scientific report I would suggest The California Earthquake of April 18, 1906 Report of the State Earthquake Commission authored by Anderw C. Lawson Chairman and published by the Carnegie Institution of Washington in 1908. It was reprinted in 1969. There is no ISBN. It is two volume set with accompanying map book. Each book is 9x11x2-inch and the map book is 9x11x1. Bound in a red cover hardback format. I found the set at the Stanford University Technical bookstore in downtown Palo Alto (I'm not certain they are still there...) about ten years ago. The text is the complete written record of the event and details the physical events by town. It also contains a massive amount of photos with detailed descriptions. Another scientific report, but is very difficult to obtain, is the USGS bulletin No. 324 published in 1907, The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and Strural Materials by Gilbert, Humphrey, Sewell and Soule. This has a great foldout panoramic photo of the city take from the top of market street after the fire was extinguished. The publication details general lesson and a few harsh words about the use of dynamite to put out a fire... Some attempts were made to stop its (the fire) progress with dynamite, but from what evidence I was able to obtain I doubt very much whether a great deal was accomplished by this means (1907, Gilbert, Humphery, Sewell and Soule). The text focuse on the structures and the effects the earthquake had on the city of San Fancisco. From the standpoint of the experience of living through the 1906 event the a book written by Gordon Thomas and MaxMorgan Weitts entitled The San Francisco Earthquake published in 1971 by Stein and Day the SBN is 8128-1360 is great reading. This 292 page hard cover book details the event by interviewing 28 survivors and taking information from many other published sources of the era. The Bibliography alone is great reading because it lists many of the lost publications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) ublications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: FW: 1906 Quake Books.... From: steve hammond shammon1@............. Date: Mon, 29 Apr 2002 10:10:04 -0700 -----Original Message----- From: steve hammond [SMTP:shammon1@.............. Sent: Monday, April 29, 2002 10:07 AM To: 'psn-l@................ PSN Subject: RE: 1906 Quake Books.... For a scientific report I would suggest The California Earthquake of April 18, 1906 Report of the State Earthquake Commission authored by Anderw C. Lawson Chairman and published by the Carnegie Institution of Washington in 1908. It was reprinted in 1969. There is no ISBN. It is two volume set with accompanying map book. Each book is 9x11x2-inch and the map book is 9x11x1. Bound in a red cover hardback format. I found the set at the Stanford University Technical bookstore in downtown Palo Alto (I'm not certain they are still there...) about ten years ago. The text is the complete written record of the event and details the physical events by town. It also contains a massive amount of photos with detailed descriptions. Another scientific report, but is very difficult to obtain, is the USGS bulletin No. 324 published in 1907, The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and Strural Materials by Gilbert, Humphrey, Sewell and Soule. This has a great foldout panoramic photo of the city take from the top of market street after the fire was extinguished. The publication details general lesson and a few harsh words about the use of dynamite to put out a fire... Some attempts were made to stop its (the fire) progress with dynamite, but from what evidence I was able to obtain I doubt very much whether a great deal was accomplished by this means (1907, Gilbert, Humphery, Sewell and Soule). The text focuse on the structures and the effects the earthquake had on the city of San Fancisco. From the standpoint of the experience of living through the 1906 event the a book written by Gordon Thomas and MaxMorgan Weitts entitled The San Francisco Earthquake published in 1971 by Stein and Day the SBN is 8128-1360 is great reading. This 292 page hard cover book details the event by interviewing 28 survivors and taking information from many other published sources of the era. The Bibliography alone is great reading because it lists many of the lost publications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: recording drum on ebay From: ChrisAtUpw@....... Date: Mon, 29 Apr 2002 13:22:42 EDT In a message dated 29/04/02, royb1@........... writes: > Hi gang, > Ebay has a "seismograph recording drum" item # 864881377 > The auction ends 5/5. > Bob Barns The motor under the red tab looks as if it is synchronous (see the phase control straps), so you may not be able to alter the drive speed. There is no sign of a pen mechanism for writing a trace. I had no difficulty in deciding not to bid for this item. Regards, Chris Chapman In a message dated 29/04/02, royb1@........... writes:

Hi gan g,
 Ebay has a "seismograph recording drum" item # 864881377
The auction ends 5/5.
Bob Barns
      The motor under the red tab looks as if it is synchronous (see the phase control strap s), so you may not be able to alter the drive speed. There is no sign of a pen mechanism for writing a trace. I had no difficul ty in deciding not to bid for this item.

      Regards,

      Chris Chapman Subject: Re: recording drum on ebay From: Doug Crice dcrice@............ Date: Mon, 29 Apr 2002 11:08:08 -0700 This is a drum recorder from a classic seismograph vault. Back in the olden days, seismometers were connected to an optical galvanometer, which is kind of an analog voltmeter with a tiny mirror instead of a needle. They are quite sensitive, and a small signal causes the mirror to twist. In the vault, there is a lamp which shines a light beam on the mirror then back to the drum. With perhaps a 4 meter optical path, you get optical leverage (or amplification), so it's possible to make a pretty sensitive seismograph with no electronics at all. The drum is loaded with photographic paper, and the light writes a classic drum recording on the paper (which of course has to be developed). To translate the traces each revolution, the drum has to move sideways, which is why the photo shows the device as being much wider than the actual drum. When the technician comes by daily, he changes the paper, develops the record, and re-positions the drum at the start point (besides checking the equipment). If somebody has a pen motor laying around, you could make it into a modern pen-and-ink system, and it might be useful for that. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: drumplot program From: "Norman Davis" wb6shi@........ Date: Mon, 29 Apr 2002 13:51:52 -0700 Bob McClure I must have missed it, but I don't see a link to where I can download your software Norm WB6SHI email: wb6shi@........ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: recording drum on ebay From: CapAAVSO@....... Date: Mon, 29 Apr 2002 18:07:30 EDT In a message dated 4/29/02 7:08:54 PM GMT Daylight Time, dcrice@............ writes: (See Below) Hi Gang, I have one of these you can have for $50, which is the first bid on the eBay instrument. Mine, however, is the complete instrument with the very sensitive galvanometer Doug mentions that needs no electronics. It also comes with the lamp and optics to focus the light beam on the galvanometer's mirror and reflect it from there to the light sensitive paper on the drum. The length of the light beam is 1 meter. It is a complete instrument made by Sprengnether Instrument Company in St. Louis, Missouri, USA. It is packed in its original wooden shipping box and has never been unpacked. I did open the box to make sure everything is there. It is, including the owners manual. The galvanometer and light beam optics are wrapped in pages from the 23 July 1973, St. Louis Dispatch newspaper. I am old (84) and would like to find a good home for this beautiful precision instrument because I will not live long enough to do anything with it. There are too many other things I must do before my time comes and I must go. If you are interested I can send pictures copied from the owner's manual. Cap Hossfield 935 Franklin Turnpike Hewitt, New Jersey 07421 USA ------------------------------------------------------------------------------ ------------------------------------- << Subj: Re: recording drum on ebay Date: 4/29/02 7:08:54 PM GMT Daylight Time From: dcrice@............ (Doug Crice) Sender: psn-l-request@.............. Reply-to: psn-l@.............. To: psn-l@.............. This is a drum recorder from a classic seismograph vault. Back in the olden days, seismometers were connected to an optical galvanometer, which is kind of an analog voltmeter with a tiny mirror instead of a needle. They are quite sensitive, and a small signal causes the mirror to twist. In the vault, there is a lamp which shines a light beam on the mirror then back to the drum. With perhaps a 4 meter optical path, you get optical leverage (or amplification), so it's possible to make a pretty sensitive seismograph with no electronics at all. The drum is loaded with photographic paper, and the light writes a classic drum recording on the paper (which of course has to be developed). To translate the traces each revolution, the drum has to move sideways, which is why the photo shows the device as being much wider than the actual drum. When the technician comes by daily, he changes the paper, develops the record, and re-positions the drum at the start point (besides checking the equipment). If somebody has a pen motor laying around, you could make it into a modern pen-and-ink system, and it might be useful for that. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: carbon copy From: "Larry Cochrane" cochrane@.............. Date: Mon, 29 Apr 2002 18:17:58 -0700 Barry, If you are running SDR (it's hard to keep track of who's running = what....) on your DOS system you probably will not be able to run any = other programs other then SDR on the system. There is a DOS version of = PC Anywhere, a program like VNC and carbon copy, but someone on this = list tried it a few years ago and it interfered with the 1 millisecond = interrupt generated by the A/D board. This 1 ms interrupt is used for = time keeping. If you want to do more then simple datalogging I suggest you upgrade to = my new WinSDR program. This program has many features that are not = supported in SDR. These features include creating GIF images of your = sensor data, see this page for an example = http://www.seismicnet.com/currentseismicity.html, FTP uploading of new = even files created by WinSDR and digital filtering of the data supplied = to the event triggering process. See this page for more information on WinSDR = http://www.seismicnet.com/winsdr/. -Larry Cochrane Redwood City, PSN ----- Original Message -----=20 From: Barry=20 To: psn-l@................. Sent: Sunday, April 28, 2002 4:42 PM Subject: carbon copy Hi All Pretty quiet lately. I was looking into a Dos based server for the = sensor room. I looked at VNC but it appears to be a guest program. I did = find out about another program called "Carbon Copy". Anyone used this? = It seems to have a windows and dos version. I haven't got the evaluation = version to work on my system. Regards Barry
Barry,
 
If you are running SDR (it's = hard to keep=20 track of who's running what....) on your DOS system you probably = will not=20 be able to run any other programs other then SDR on the system. There is = a DOS=20 version of PC Anywhere, a program like VNC and carbon copy, but someone=20 on this list tried it a few years ago and it interfered with the 1=20 millisecond interrupt generated by the A/D board. This 1 ms = interrupt is=20 used for time keeping.
 
If you want to do more then simple = datalogging I=20 suggest you upgrade to my new WinSDR program. This program has = many=20 features that are not supported in SDR. These features=20 include creating GIF images of your sensor data, see this page = for an=20 example http://www.seis= micnet.com/currentseismicity.html, FTP=20 uploading of new even files created by WinSDR and digital filtering of = the data=20 supplied to the event triggering process.
 
See this page for more information on = WinSDR http://www.seismicnet.com/wins= dr/.
 
-Larry Cochrane
Redwood City, PSN
 
 
----- Original Message -----
From:=20 Barry
Sent: Sunday, April 28, 2002 = 4:42=20 PM
Subject: carbon copy

Hi All
 Pretty quiet lately. I was = looking into a=20 Dos based server for the sensor room. I looked at VNC but it appears = to be a=20 guest program. I did find out about another program called "Carbon = Copy".=20 Anyone used this? It seems to have a windows and dos version. I = haven't got=20 the evaluation version to work on my system. Regards
Barry
Subject: Re: ROCKLAND DUAL HI/LO 1042 FILTERS From: RADIOTEL@....... Date: Mon, 29 Apr 2002 21:40:47 EDT __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ROCKLAND DUAL HI/LO 1042 FILTERS From: RADIOTEL@....... Date: Mon, 29 Apr 2002 21:48:56 EDT I apologize for not including the email address of the company that is selling the Rockland dual Hi/Lo 1042 filters this morning when I posted the information to the list. These filters filter down below .1 Hz and therefore can be used for long period instruments. As I stated in my previous posting, the price is certainly right at $75.00 per each including UPS delivery or $200.00 for three including UPS delivery. The owner of the company is a guy named JT who can be reached at the following email address: jtacoustic@.......... I also apologize for hitting the wrong button earlier and sending an empty message posting. Jim Allen Cerritos, California __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 1906 Quake Books.... From: "Kareem" temp@............. Date: Mon, 29 Apr 2002 20:39:49 -0700 Thanks Steve. I've heard of those books and the fact that they might be difficult to obtain. I look hard. Thanks again. Kareem -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of steve hammond Sent: Monday, April 29, 2002 10:07 AM To: 'psn-l@................ PSN Subject: RE: 1906 Quake Books.... For a scientific report I would suggest The California Earthquake of April 18, 1906 Report of the State Earthquake Commission authored by Anderw C. Lawson Chairman and published by the Carnegie Institution of Washington in 1908. It was reprinted in 1969. There is no ISBN. It is two volume set with accompanying map book. Each book is 9x11x2-inch and the map book is 9x11x1. Bound in a red cover hardback format. I found the set at the Stanford University Technical bookstore in downtown Palo Alto (I'm not certain they are still there...) about ten years ago. The text is the complete written record of the event and details the physical events by town. It also contains a massive amount of photos with detailed descriptions. Another scientific report, but is very difficult to obtain, is the USGS bulletin No. 324 published in 1907, The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and Strural Materials by Gilbert, Humphrey, Sewell and Soule. This has a great foldout panoramic photo of the city take from the top of market street after the fire was extinguished. The publication details general lesson and a few harsh words about the use of dynamite to put out a fire... Some attempts were made to stop its (the fire) progress with dynamite, but from what evidence I was able to obtain I doubt very much whether a great deal was accomplished by this means (1907, Gilbert, Humphery, Sewell and Soule). The text focuse on the structures and the effects the earthquake had on the city of San Fancisco. From the standpoint of the experience of living through the 1906 event the a book written by Gordon Thomas and MaxMorgan Weitts entitled The San Francisco Earthquake published in 1971 by Stein and Day the SBN is 8128-1360 is great reading. This 292 page hard cover book details the event by interviewing 28 survivors and taking information from many other published sources of the era. The Bibliography alone is great reading because it lists many of the lost publications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Interesting article on using GPS receivers as a strong motion sensor From: "Larry Cochrane" cochrane@.............. Date: Tue, 30 Apr 2002 14:47:59 -0700 http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=15044 -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 1906 Quake Books.... From: Karl Cunningham karlc@.......... Date: Tue, 30 Apr 2002 17:47:34 -0700 Kareem -- I second Steve Hammond's recommendation about the Gordon Thomas and Max Morgan Witts book titled "The San Francisco Earthquake". Once I started it, I just couldn't put it down. My wife got my copy on ebay -- you might try there. Regards. Karl Cunningham --On Sunday, April 28, 2002 9:00 PM -0700 Kareem wrote: > > Does anyone know where I can get any other books on the April 18, '06 > Quake & fire of San Francisco? I'm interested on getting as much > information as I can on the buildings damaged in SF as well as other > parts of the bay area. I already own the book The Earth Shook and the > Sky Burned. > > Thanks, > Kareem __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 1906 Quake Books.... From: "Kareem" temp@............. Date: Tue, 30 Apr 2002 19:49:47 -0700 Thanks so much Karl, I've never sought Ebay for anything before. I wouldn't know where to start. -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Karl Cunningham Sent: Tuesday, April 30, 2002 5:48 PM To: psn-l@.............. Subject: Re: 1906 Quake Books.... Kareem -- I second Steve Hammond's recommendation about the Gordon Thomas and Max Morgan Witts book titled "The San Francisco Earthquake". Once I started it, I just couldn't put it down. My wife got my copy on ebay -- you might try there. Regards. Karl Cunningham --On Sunday, April 28, 2002 9:00 PM -0700 Kareem wrote: > > Does anyone know where I can get any other books on the April 18, '06 > Quake & fire of San Francisco? I'm interested on getting as much > information as I can on the buildings damaged in SF as well as other > parts of the bay area. I already own the book The Earth Shook and the > Sky Burned. > > Thanks, > Kareem __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 1906 Quake Books.... From: ian ian@........... Date: Tue, 30 Apr 2002 17:37:07 -1000 ebay is pretty amazing: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1533403767 waiting to be bought... Kareem wrote: >Thanks so much Karl, I've never sought Ebay for anything before. I >wouldn't know where to start. > >-----Original Message----- >From: psn-l-request@.............. [mailto:psn-l-request@............... >On Behalf Of Karl Cunningham >Sent: Tuesday, April 30, 2002 5:48 PM >To: psn-l@.............. >Subject: Re: 1906 Quake Books.... > > >Kareem -- > >I second Steve Hammond's recommendation about the Gordon Thomas and Max >Morgan Witts book titled "The San >Francisco Earthquake". Once I started it, I just couldn't put it down. >My wife got my copy on ebay -- you might try there. > >Regards. >Karl Cunningham > > >--On Sunday, April 28, 2002 9:00 PM -0700 Kareem >wrote: > >>Does anyone know where I can get any other books on the April 18, '06 >>Quake & fire of San Francisco? I'm interested on getting as much >>information as I can on the buildings damaged in SF as well as other >>parts of the bay area. I already own the book The Earth Shook and the >> > >>Sky Burned. >> >>Thanks, >>Kareem >> > > >__________________________________________________________ > >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. > > ebay is pretty amazing:

http://cgi.ebay.com/ws/eB ayISAPI.dll?ViewItem&item=1533403767

waiting to be bought...

Kareem wrote:
Thanks so much Karl, I've never sought Ebay for anything before. I
wouldn't know where to start.

-----
Original Message-----
From: psn-l-request@web
tronics.com [mailto:psn-l-request@.............
m]
On Behalf Of Karl Cunningham
Sent: Tuesday, April 30, 2002 5:48 PM
To: psn-l@..............
Subject: Re: 1906 Quake Books....


Kareem --

I seco
nd Steve Hammond's recommendation about the Gordon Thomas and Max
Morgan Witts book titled "The San 
Francisco Earthquake
".  Once I started it, I just couldn't put it down.
My wife got my copy on ebay -- you might try there.

Regards.
K
arl Cunningham


--On Sunday, April 28, 2002 9:00 PM -0700 Kareem <temp@.............>
wrote:

Does anyone know where I can get any other books on the April 18, '06 
Quake & fire of San Francisco? I
'm interested on getting as much 
information as I can on the buildings damaged in SF as well as other 
parts of the bay 
area.  I already own the book The Earth Shook and the

Sky Burned.
  
Thanks,
Kareem


__________________________________________________________

Public Seismic Network Mail
ing 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.



__________________________________________________________

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To
 leave this list email PSN-L-REQUEST@...........
COM with 
the body of the message (first line only): unsubscribe
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Subject: Re: 1906 Quake Books.... From: John Lahr johnjan@........ Date: Wed, 01 May 2002 06:26:21 -0600 Did you check with the USGS library in Menlo Park?  In addition to books they
could have copies of photographs.

Cheers,
John

At 09:00 PM 4/28/2002 -0700, you wrote:
Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area.
I already own the book The Earth Shook and the Sky Burned.
 
Thanks,
Kareem

John C. Lahr
1925 Foothills Road
Golden, CO 80402
Phone: (303) 215-9913 
john@........
http://lahr.org/john-jan/ Subject: RE: 1906 Quake Books.... From: steve hammond shammon1@............. Date: Wed, 1 May 2002 13:10:06 -0700 Hi John, I had heard the USGS book store closed... Do you know if they are still on Middlefield Road in Palo Alto? Regards Steve Hammond PSN Aptos, CA -----Original Message----- From: John Lahr [SMTP:johnjan@......... Sent: Wednesday, May 01, 2002 5:26 AM To: psn-l@.............. Subject: Re: 1906 Quake Books.... << File: ATT00000.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Digest from 05/01/2002 00:01:15 From: Bill Steele bill@...................... Date: Thu, 2 May 2002 09:11:20 -0700 (PDT) You can also find many great images at the National Earthquake Engineering Information Center (NEIC) at UC Berkeley. Online access at: http://nisee.berkeley.edu/ Seems to be broken but they suggest you call the librarian there for help. Bill ******************************************************************** William P. Steele Phone: 206-685-5880 Director of Information Services Pacific Northwest Seismograph Network (PNSN) UW Earth and Space Sciences Box 351310 Seattle, WA 98195-1310 http://www.ess.washington.edu/SEIS/ bill@.................. ******************************************************************** On Thu, 2 May 2002 psn-l-digest-request@.............. wrote: > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > | Message 1 | > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > Subject: Re: 1906 Quake Books.... > From: John Lahr > Date: Wed, 01 May 2002 06:26:21 -0600 > > > Did you check with the USGS library in Menlo Park?  In addition to > books they
> could have copies of photographs.

> Cheers,
> John

> At 09:00 PM 4/28/2002 -0700, you wrote:
>

Does anyone know where > I can get any other books on the April 18, '06 Quake & fire of San > Francisco? I'm interested on getting as much information as I can on the > buildings damaged in SF as well as other parts of the bay > area.
> I already own the book The Earth Shook and the Sky > Burned.
>  
> Thanks,
> Kareem
>

> John C. Lahr
> 1925 Foothills Road
> Golden, CO 80402
> Phone: (303) 215-9913 
> john@........
> http://lahr.org/john-jan/ > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > | Message 2 | > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > Subject: RE: 1906 Quake Books.... > From: steve hammond > Date: Wed, 1 May 2002 13:10:06 -0700 > > Hi John, I had heard the USGS book store closed... Do you know if they are still on Middlefield Road in Palo Alto? > > Regards Steve Hammond PSN Aptos, CA > > -----Original Message----- > From: John Lahr [SMTP:johnjan@......... > Sent: Wednesday, May 01, 2002 5:26 AM > To: psn-l@.............. > Subject: Re: 1906 Quake Books.... > > << File: ATT00000.html >> > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-DIGEST-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: ebay seismom.? From: BOB BARNS royb1@........... Date: Sat, 04 May 2002 10:08:51 -0400 Hi gang, Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether seismometer. I don't think that is a seismometer but may be a magnetometer or a gravimeter. What is it? Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: Hammonds hammond@........... Date: Sat, 04 May 2002 07:43:04 -0800 Bob, it is indeed a Sprengnether magnetometer. Bob Hammond http://apsn.awcable.com At 06:08 AM 5/4/2002, you wrote: >Hi gang, > Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether >seismometer. >I don't think that is a seismometer but may be a magnetometer or a >gravimeter. > What is 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. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: meredithlamb meredithlamb@............. Date: Sat, 04 May 2002 11:25:23 -0600 Bob & Bob and/or all, It looks to have a optical lens atop the unit, that perhaps has "grid marks" somewhere for a value reading? Aren't magnetometers/gravimeters essentially (for the age of the instrument), "simply" (likely a understatement?), a vertical mass on a special spring? Meredith Lamb Hammonds wrote: > Bob, it is indeed a Sprengnether magnetometer. > > Bob Hammond > http://apsn.awcable.com > > At 06:08 AM 5/4/2002, you wrote: > >Hi gang, > > Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether > >seismometer. > >I don't think that is a seismometer but may be a magnetometer or a > >gravimeter. > > What is 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. > > __________________________________________________________ > > 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 seismom.? From: Hammonds hammond@........... Date: Sat, 04 May 2002 09:44:01 -0800 Meridith, I think this particular magnetometer has one or more small magnets attached to a hair-like quartz fiber held vertically and under tension. Ambient light (coming in from that long frosted slit on the top and side of the instrument) shines on a tiny mirror which is also attached to the quartz fiber. Any perturbation of the magnetic field causes the magnet(s) and the mirror to move and thus moving the reflected light beam on a scale. The scale is read through the lens at the top of the instrument. If the quartz fiber is broken, the instrument is useless. I haven't found a source for them. Bob Hammond apsn At 09:25 AM 5/4/2002, you wrote: >Bob & Bob and/or all, > >It looks to have a optical lens atop the unit, that perhaps >has "grid marks" somewhere for a value reading? Aren't >magnetometers/gravimeters essentially (for the age of the >instrument), "simply" (likely a understatement?), a vertical >mass on a special spring? > >Meredith Lamb > >Hammonds wrote: > > > Bob, it is indeed a Sprengnether magnetometer. > > > > Bob Hammond > > http://apsn.awcable.com > > > > At 06:08 AM 5/4/2002, you wrote: > > >Hi gang, > > > Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether > > >seismometer. > > >I don't think that is a seismometer but may be a magnetometer or a > > >gravimeter. > > > What is 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. > > > > __________________________________________________________ > > > > 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: ebay seismom.? From: meredithlamb meredithlamb@............. Date: Sat, 04 May 2002 14:24:05 -0600 Bob, Thanks....that all makes sense. Suspect anyone buying such would run the risk of the fiber breaking via shipment; even with/without any fiber tension loosening/tightening mechanical device. Interesting gizmo though. Meredith Hammonds wrote: > Meridith, I think this particular magnetometer has one or more small > magnets attached to a hair-like quartz fiber held > vertically and under tension. > Ambient light (coming in from that long frosted slit on the top and side of > the instrument) shines on a tiny mirror which > is also attached to the quartz fiber. Any perturbation of the magnetic > field causes the magnet(s) and the mirror to move > and thus moving the reflected light beam on a scale. The scale is read > through the lens at the top of the instrument. > > If the quartz fiber is broken, the instrument is useless. I haven't found > a source for them. > > Bob Hammond > apsn > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: ChrisAtUpw@....... Date: Sat, 4 May 2002 21:19:08 EDT In a message dated 04/05/02, hammond@........... writes: > Meredith, I think this particular magnetometer has one or more small magnets > attached to a hair-like quartz fibre held vertically and under tension. Hi Bob, Horizontal field magnetometers normally have horizontal viewing systems, not a vertical one like this instrument. It could be an instrument for measuring vertical magnetic field changes. They have two horizontal magnets and a mirror on a horizontal quartz spring + suspension filament + mirror. The quartz components were made as an integral system, fused together and are not repairable. > Ambient light (coming in from that long frosted slit on the top and side of > the instrument) shines on a tiny mirror which is also attached to the > quartz fibre. Any perturbation of the magnetic field causes the magnet(s) > and the mirror to move > and thus moving the reflected light beam on a scale. The scale is read > through the lens at the top of the instrument. A calibrated ground glass scale may be illuminated by light from the window and viewed by a lens + graduated eyepiece from it's reflection in the mirror. > If the quartz fibre is broken, the instrument is useless. I haven't found > One thing that puzzles me is that while the base swivels, there does not seem to be a graduation ring on it. There is no obvious clamping mechanism. There is no offset adjustment knob on the side that you can see. I would have expected the lady to have shown it if there were one. Perhaps someone might send the photo to Sprengnether? I am rather doubtful about the box being cherry wood. Mahogany was usually used for instrument cases. Regards, Chris Chapman In a message dated 04/05/02, hammond@........... writes:

Meredi th, I think this particular magnetometer has one or more small magnets attached to a hair-like quartz fibre held vertically and under tension.


Hi Bob,

     Horizontal field magnetometers normally have horizontal viewing systems, not a vertical one like this instrument. It could be an instrument for measuring vertical magnetic field changes. They have two horizontal magnets and a mirror on a horizontal quartz spring + suspension filament + mirror. The quartz components were made as an integral syst em, fused together and are not repairable.

Ambient light (coming in from that long frosted slit on the top and side of the instrument) shines on a tiny mirror which is also attached to the quartz fibre.  Any perturbation of the magnetic field causes the magnet(s) and the mirror to move
and thus moving the reflected light beam on a scale.  The scale is read
through the lens at the top of the instrument.


       A calibr ated ground glass scale may be illuminated by light from the window and viewed by a lens + graduated eyepiece from it's reflect ion in the mirror.

If the quartz fibre is broken, the instrument is useles s.  I haven't found
a source for them.


      One thing that puzzles me is that while the base swivels, there does not seem to be a graduation ring on it. There is no obvious clamping mechanism. There is no offset adjustment knob on the side that you can see. I would have expected the lady to have shown it if there were one. Perhaps someone might send the photo to Sprengnether? I am rather doubtful about the box being cherry wood. Mahogany was usually used for instrument cases.

      Regards,

      Chris Chapman Subject: Re: Focal Mechanism Program From: John Lahr johnjan@........ Date: Tue, 07 May 2002 07:44:24 -0600 Hi George, Thanks for fixing the program. It's a great use of the Internet. If I knew how to program in Java it would be fun to have a similar program with sliders to control the three parameters. On a trivial note, there is a typo on this line: Enter strike, sip and slip: Cheers, John At 11:28 AM 5/7/2002 +0100, you wrote: >Hi John - > > Thanks for your warning about the inoperability of the program. I'll >used your info to troubleshoot the problem, and it seems some shared libraries >weren't locatable. It should work now (at least it does on my Netscape 3.01). > > George > > Date: Sat, 20 Apr 2002 19:10:43 -0600 > To: George.Helffrich@............. > From: John Lahr > Subject: Focal Mechanism Program > > George Helffrich > Bristol University > > Dear George, > > I have been trying out your focal mechanism plotting program: > http://www1.gly.bris.ac.uk/~george/focmec.html > and get the following error message: > System failed to produce a focal mechanism! Error messages read: > > Cheers, > John Lahr * John C. and Jan H. Lahr * JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * Phone: (303) 215-9913 * http://lahr.org/john--jan/ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Focal Mechanism Program From: "George Harris" gjharris@............. Date: Tue, 7 May 2002 16:23:59 -0700 John, Somehow this message came to me (George Harris) from PSN. You may want to resent it to the proper place. George Harris ----- Original Message ----- From: "John Lahr" To: "George Helffrich +44 117 954 5437" Cc: Sent: Tuesday, May 07, 2002 6:44 AM Subject: Re: Focal Mechanism Program > Hi George, > > Thanks for fixing the program. It's a great use of the Internet. > If I knew how to program in Java it would be fun to have a similar > program with sliders to control the three parameters. > > On a trivial note, there is a typo on this line: > Enter strike, sip and slip: > > Cheers, > John > > At 11:28 AM 5/7/2002 +0100, you wrote: > >Hi John - > > > > Thanks for your warning about the inoperability of the program. I'll > >used your info to troubleshoot the problem, and it seems some shared libraries > >weren't locatable. It should work now (at least it does on my Netscape 3.01). > > > > George > > > > Date: Sat, 20 Apr 2002 19:10:43 -0600 > > To: George.Helffrich@............. > > From: John Lahr > > Subject: Focal Mechanism Program > > > > George Helffrich > > Bristol University > > > > Dear George, > > > > I have been trying out your focal mechanism plotting program: > > http://www1.gly.bris.ac.uk/~george/focmec.html > > and get the following error message: > > System failed to produce a focal mechanism! Error messages read: > > > > Cheers, > > John Lahr > > * John C. and Jan H. Lahr > * JohnJan@........ > * 1925 Foothills Road > * Golden, Colorado 80401-1718 > * Phone: (303) 215-9913 > * http://lahr.org/john--jan/ > > __________________________________________________________ > > 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: Focal Mechanism Program From: Dave Nelson davenn@.............. Date: Wed, 08 May 2002 17:37:32 +1000 Hi George, also have jst been trying out the foc mech page u have made the problem i discovered was that when i added a new set of stk dip slp info it jst plotted the foc mec of the previous calculation including the stk dp slp parameters am using netscape 4.08 cheers dave __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Event File Mailer Program and new WinQuake and WinSDR releases From: "Larry Cochrane" cochrane@.............. Date: Sun, 12 May 2002 19:12:55 -0700 All, This is the first of two emails I am sending to both the PSN-L list and the WinSDR mailing lists. Sorry if you receive them two times.... I have a new program available for PSN stations to use. The program is called Event File Mailer (EFM), and as the name suggests, it emails event files to users. Here's now it works. At the PSN station the operator must run the new version of WinSDR and the EFM program and end users will need to install the new version of WinQuake. The new version of WinQuake as a new Event File Request dialog. In this dialog box the user can select one or more stations and for each station one or more sensor channels. After filling out the request form and pressing the Send Request button, WinQuake will send an email request to the selected PSN stations. At the PSN station the EFM program monitors a email POP account for incoming request messages. When one is found EFM creates a event file request file that WinSDR uses to create event files. Once WinSDR creates the event files, EFM sends back an email message to the user with the event file(s) attached with the message. End users uses their regular email program like Outlook Express or Eudora to receive the files. WinQuake does not directly receive the files from EFM. If you associate the .psn file with WinQuake all you should need to do is click on the attachment and WinQuake will be opened to display the new file. Here are the download links to the new programs: The new version of WinSDR can be downloaded here http://www.seismicnet.com/winsdr/. I don't have a web page ready for EFM and all of the information for this program is documented below. You can download the EFM setup program here http://www.seismicnet.com/software/efm10.exe. The new version of WinQuake can be downloaded here http://www.seismicnet.com/software. While you are on that page you should also download the "Current PSN Station Remote Event File Request Database file". Below is additional information on WinQuake. Changes to WinSDR and information on how to use EFM will be documented in my next email message. In WinQuake the only other thing new with the program, other then the Remote Event File request feature, is the main Open File dialog box now moves with the WinQuake window. I have documentation on how to use the Remote Event File dialog box. You can open the documentation by pressing the Help button in the Remote Event File Request dialog box. The Remote Event File Request dialog box is opened from the main Open File dialog box. There you will see the new "Remote" button. There are several things you need to do in WinQuake before you can use this feature. First you need to create a file called remote.dat in the root WinQuake directory. WinQuake will do this for you. This file contains all of the stations and channels that can be accessed using this feature. First download the file PSNDatabase.zip here http://www.seismicnet.com/software/psndatabase.zip. Unzip the file and note the where the RemoteStations.txt file is located. Now open WinQuake and press the Remote button in the Open File dialog box. Now press the "Load Station File" button and use the Windows File Open dialog box to locate and open the RemoteStations.txt file. You should now see one or more stations in the Remote Station list box. Before you can send an email request using WinQuake, you need to fill in the User Information Group box and SMTP authentication information if the SMTP server you are using requires authentication. See the help documentation for more information on all of these fields. Next you need to get the channel list for each PSN station. Besides event files, EFM will send back an email message with a list of sensor channels. In the Remote Station list box, select one or more stations and then check the "Get Station Information" check box and press the Send Request button. Within a few minutes you should receive an email message from the PSN station. In the email message is the station's channel(s) information. The message should be saved as a text file. Use the Save As menu items in your email program to do this. Now in WinQuake select the station in the Remote Station list box and then press the Add button. In the Station Information dialog box you will see a "Load File" button. Press this button and use the File Open dialog box to locate and open the station channel file you saved from the email message you received from the station. Now close the Station Information dialog box. You are now ready to request event files for the PSN station. One or more email messages will be sent out to all selected Remote Station. Only the channels selected in the Channel list box will be requested. Again, for more info see the help documentation. That's it for WinQuake. I will be sending out another email message documenting the changes to WinSDR and how to use the new EFM program. Regards, Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: WinSDR and Event File Mailer part two From: "Larry Cochrane" cochrane@.............. Date: Sun, 12 May 2002 22:41:50 -0700 Hi Again, Here's part two of my two part message documenting my new Event File Mailer (EFM) program. Documented in this email message is what's new in WinSDR and how to use EFM. Besides support for the EFM program the only other thing new with WinSDR is the ability to download the firmware to the Serial Output A/D board directly from within WinSDR. This eliminates the need for the RFU program supplied by the manufacturer of the CPU module on the A/D board. See the WinSDR documentation for more information. The firmware on the A/D board is still version 1.8 and SDR Server remains at version 1.6. To use the EFM program with WinSDR you need to specify a directory on either the WinSDR system or a system on your LAN. In the System Settings dialog box you will see the "Request Control File" display field. Use the browse button next to this field to locate or create a directory that can be accessed by both WinSDR and EFM. This directory should be used for just ELM and WinSDR request feature. If you use the Replay feature in WinQuake, WinQuake will also use this directory. The directory should not contain any files and the directory name MUST NOT have a space in it. Example, don't use a directory like C:\Program Files\Request\. You can download WinSDR version 2.0.5 here http://www.seismicnet.com/winsdr/. You must use the new WinSDR version with EFM. That's it for WinSDR. Now for the Event File Mailer. You can download the install program using this link http://www.seismicnet.com/software/efm10.exe. EFM can be installed on the same system running WinSDR or another system located on your LAN. If you install the program on another system, you will need to setup file sharing between the two systems. EFM and WinSDR will use two directories. One is used for the request file, see WinSDR docs for more info, and the other will be used to hold the event files produced by WinSDR and converted to an email message by EFM. Once the email message gets sent out, the event file(s) will be deleted from the directory. So that people can create event files using WinQuake, you will need a dedicated email account for ELM. This email address will be used by WinQuake to send the request too, and ELM will check this email POP account for new request files sent out by WinQuake users. When setting up ELM - DO NOT! use your normal email address. ELM will read all messages sent to the email address. The messages sent to ELM are not saved and they will be DELETED from the mail server after ELM checks for event or station request keywords. There are several ways you can get an email account for ELM. Your ISP may allow you to have more then one email address or you can use one of the free email account services available on the Internet. The email address must be accessible using POP. I believe that both Hotmail and Yahoo no longer give out free POP account email address. For my testing I used www.MyRealBox.com. It's very easy to setup an account and it's free. Once you have an email account you can startup EFM. In the POP Account group box enter the POP server domain name, example pop.myrealbox.com, the user name and password. Next enter a number in the Check Every edit box. This is the time interval EFM will check the mail box. The default is every 2 minutes. The Enable check box will become enabled once you enter all of the information needed by EFM and save the data to the eventreq.ini file. EFM can currently handle two WinSDR systems allowing it to request event files for up to 16 channels. In the WinSDR Directories use the browse button next to the First System Directory to locate the root directory of the first WinSDR system. ELM uses this to read the WinSDR.ini file when it first starts up or if you press the Update button. Next locate the directory that will be used for the Request File directory. If EFM is running on the same system, select the same directory that is in the "Request Control File" display field in the System Settings dialog box of WinSDR. Remember, do not use a directory that has a space in it! If you are running two WinSDR systems enter the directories for the other system in the next two edit boxes. The Update button should be used if you make any major changes to WinSDR. Changes like changing the sample rate or number of channels to record, require that you update the EFM program with the new information. You should also press the Update button if you make any changes to the location or sensor information fields in the WinSDR Channels Settings dialog box. Next enter your station name in the Station Name edit box. In the From User Name and Email Address edit box enter a name and then the users SMTP account email address in brackets like this <>. The email address must be known by the SMTP server and it must be within brackets <>. Example: Event Request . This information is used to send out the email message and it will show up as the From: field of the message. In the WinSDR Temporary File Directory enter a directory accessible by WinSDR that will be used to hold the event files produced by WinSDR. If EFM is running on the same system as WinSDR you should leave the Temporary WinSDR Map Drive blank. If EFM is running on another system, you will need to place the mapped drive letter in this field. If WinSDR will be using a directory like c:\temp\ to hold the files and if drive E on the EFM system is mapped to the C drive on the WinSDR system, enter E in the Temporary WinSDR Map Drive edit box. Next open the SMTP Information dialog box by pressing the SMTP Info button. In this dialog box enter the SMTP server name, and if the server requires authentication, set the select box to Authentication and enter the Account Name and Password. If you use MyRealBox.com's SMTP server you will need to use authentication. Once you have all of the information entered the Save button should be enabled. Pressing this button will save the data in the INI file and enable the Enable Check box in the POP Account Group. When you enable the pop account EFM will start checking the email address for new email messages. The Check Now button can be used to force EFM to check the POP account for new messages. The Statistics button opens a dialog box that displays some statistical numbers like the number of files sent, number of bytes sent etc. When you startup the program it will place a small icon on the system tray. You can hide the program by double clicking on the icon in the system tray. Double clicking again will reshow the window. The program will continue to run when it is hidden. The next thing to do is to use WinQuake to test your setup. See my last email message and the WinQuake documentation on how to use the Remote Event File Request feature in WinQuake. Once you get everything working please let me know what the email address and the station name is so I can add it to the station list file. Regards, Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: sdr-help From: "JORD" jord@............ Date: Mon, 13 May 2002 21:03:23 -0400 Hi this is Randy I need help in setting up sdr 4.1 I had too reformat my hard drive,it had sdr 2.71 on it be for the drive = was reformated. I do not know how too make a directory for sdr so that it can be copyed = too it,or how to copy sdr to that directory. plus I need too know how too unzip it to get it running. I had a friend do this for me befor, I have moved scine then. Thank You=20 Randy........from Whitby Ontario
Hi this is Randy
 
I need help in setting up sdr = 4.1
I had too reformat my hard drive,it=20 had sdr 2.71 on it be for the drive was = reformated.
I do not know how too make a directory = for sdr so=20 that it can be copyed too it,or how to copy sdr to that = directory.
plus I need too know how too unzip = it to get=20 it running.
I had a friend do this for me befor, I = have moved=20 scine then.
 
 
Thank You
Randy........from Whitby = Ontario
 
 
Subject: Big event From: "Larry Cochrane" cochrane@.............. Date: Mon, 13 May 2002 22:02:53 -0700 Just felt a large event here in northern California. More info to follow.... -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Big event From: Hammonds hammond@........... Date: Mon, 13 May 2002 21:29:02 -0800 5km SW of Gilroy, CA, M 5.2 http://pasadena.wr.usgs.gov/recenteqs/Quakes/nc40133364.htm Bob Hammond http://apsn.awcable.com At 09:02 PM 5/13/2002, you wrote: >Just felt a large event here in northern California. More info to follow.... > >-Larry Cochrane >Redwood City, PSN > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Big event From: steve hammond shammon1@............. Date: Tue, 14 May 2002 00:38:13 -0700 Hi Bob, Yes it was-- An e-ticket ride for sure. Jan Froom called me from Gilroy (where he lives, I live 17.5 miles NW along the cost) and we were trying to figure out where it was. We were thinking it was a 4.0 - 4.5 as it didn't feel like a 5.2. The good news is that neither of us had any damage and while the main shock data is way off scale, for the last few hours there have been several after shocks that we've recorded. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Hammonds [SMTP:hammond@............ Sent: Monday, May 13, 2002 10:29 PM To: psn-l@.............. Subject: Re: Big event 5km SW of Gilroy, CA, M 5.2 http://pasadena.wr.usgs.gov/recenteqs/Quakes/nc40133364.htm Bob Hammond http://apsn.awcable.com At 09:02 PM 5/13/2002, you wrote: >Just felt a large event here in northern California. More info to follow.... > >-Larry Cochrane >Redwood City, PSN > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Big event From: Hammonds hammond@........... Date: Tue, 14 May 2002 05:25:31 -0800 Steve, I'm glad you folks are ok. After Larry's email, I went to his web site to look at the current seismicity plots and the South Valley Middle School wouldn't load. Based on that, I figured the quake might have been near Gilroy. So, another method of quake location: if the PSN station isn't available on the Internet, the quake was nearby! Bob At 11:38 PM 5/13/2002, you wrote: >Hi Bob, Yes it was-- An e-ticket ride for sure. Jan Froom called me from >Gilroy (where he lives, I live 17.5 miles NW along the cost) and we were >trying to figure out where it was. We were thinking it was a 4.0 - 4.5 as >it didn't feel like a 5.2. The good news is that neither of us had any >damage and while the main shock data is way off scale, for the last few >hours there have been several after shocks that we've recorded. > >Regards, Steve Hammond PSN Aptos, CA > >-----Original Message----- >From: Hammonds [SMTP:hammond@............ >Sent: Monday, May 13, 2002 10:29 PM >To: psn-l@.............. >Subject: Re: Big event > >5km SW of Gilroy, CA, M 5.2 > >http://pasadena.wr.usgs.gov/recenteqs/Quakes/nc40133364.htm > >Bob Hammond >http://apsn.awcable.com > > >At 09:02 PM 5/13/2002, you wrote: > >Just felt a large event here in northern California. More info to >follow.... > > > >-Larry Cochrane > >Redwood City, PSN > > > >__________________________________________________________ > > > >Public Seismic Network Mailing List (PSN-L) > > > >To leave this list email PSN-L-REQUEST@.............. with > >the body of the message (first line only): unsubscribe > >See http://www.seismicnet.com/maillist.html for more information. > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >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: seismograph (?) on ebay From: BOB BARNS royb1@........... Date: Tue, 14 May 2002 09:49:12 -0400 Hi gang, I don't know what it is but it might be a seismograph-take a look. "Antique Earth Quake Seismograph ?? (1924)" Item # 1731468394 ends 5/20 Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: seismograph (?) on ebay From: ChrisAtUpw@....... Date: Tue, 14 May 2002 11:55:54 EDT In a message dated 14/05/02, royb1@........... writes: > I don't know what it is but it might be a seismograph-take a look. > "Antique Earth Quake Seismograph ?? (1924)" > Item # 1731468394 Hi Bob, This is a fluid filled recording thermometer. Fluid in the large tube expands, flows through the small bore tube and drives a metal bellows system which drives the recording arm. There should be a clock somewhere to turn the dial. The other 'Antique Seismograph Jules Richard' No:870527673 is either a recording thermometer or more probably a recording Hygrometer. I can't see from the photo. Old meteorological equipment anyway. Regards, Chris Chapman In a message dated 14/05/02, royb1@........... writes:

  ;I don't know what it is but it might be a seismograph-take a look.
"Antique Earth Quake Seismograph ?? (1924)"
 Item # 1731468394


Hi Bob,

      This is a fluid filled recording thermometer. Fluid in the large tube expands, flows t hrough the small bore tube and drives a metal bellows system which drives the recording arm. There should be a clock somewhere to turn the dial.

      The other 'Antique Seismograph Jules Richard' No:870527673 is either a recording therm ometer or more probably a recording Hygrometer. I can't see from the photo. Old meteorological equipment anyway.

      Regards,

      Chris Chapman Subject: sdr-help From: "JORD" jord@............ Date: Tue, 14 May 2002 15:24:13 -0400 Hi this is Randy I need help in setting up sdr 4.1 I had too reformat my hard drive,it had sdr 2.71 on it be for the drive = was reformated. I do not know how too make a directory for sdr so that it can be copyed = too it,or how to copy sdr to that directory. plus I need too know how too unzip it to get it running. I had a friend do this for me befor, I have moved scine then. Thank You=20 Randy........from Whitby Ontario
Hi this is Randy
 
I need help in setting up sdr = 4.1
I had too reformat my hard drive,it=20 had sdr 2.71 on it be for the drive was = reformated.
I do not know how too make a directory = for sdr so=20 that it can be copyed too it,or how to copy sdr to that = directory.
plus I need too know how too unzip = it to get=20 it running.
I had a friend do this for me befor, I = have moved=20 scine then.
 
 
Thank You
Randy........from Whitby = Ontario
 
 
Subject: Re: sdr-help From: ChrisAtUpw@....... Date: Tue, 14 May 2002 19:30:24 EDT Hi Randy, Visit http://www.seismicnet.com/ and follow the instructions for downloading. The files should extract themselves automatically and create directories. If you need another copy of Winquake, you can download the evaluation version but you will probably need an authorisation number from Larry to keep it working. For other .zip files, go to http://www.winzip.com/ and click on Download Evaluation Version. To get the shortcut logos onto desktop, click start, programmes, windows explorer; scroll down to the folder, left click once to highlight, right click for menu, scroll down to 'send to' and then left click on 'desktop'. Hope that this helps, Chris Hi Randy,

      Visit http://www.seismicnet.com/ and follow the instructions for downloading. The file s should extract themselves automatically and create directories. If you need another copy of Winquake, you can download the ev aluation version but you will probably need an authorisation number from Larry to keep it working.

      For other .zip files, go to http://www.winzip.com/ and click on Download Evaluation Ve rsion.

      To get the shortcut logos onto desktop, click start, programmes, windows explorer; scr oll down to the folder, left click once to highlight, right click for menu, scroll down to 'send to' and then left click on 'de sktop'.

      Hope that this helps,

      Chris Subject: Re: Interesting article on using GPS receivers as a strong motion sensor From: ChrisAtUpw@....... Date: Tue, 14 May 2002 22:00:32 EDT In a message dated 30/04/02, cochrane@.............. writes: > http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=15044 > I wonder if this GPS technique could be adapted to measure cumulative stress when the Earth compresses or stretches elastically prior to an Earthquake? Put pairs of receivers well separated on either side of a fault line with a base line of several km? Regards, Chris Chapman In a message dated 30/04/02, cochrane@.............. writes:

http:/ /www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=15044

      I wonder if this GPS technique could be adapted to measure cumulative stress when the Earth compresses or stretches elastically prior t o an Earthquake? Put pairs of receivers well separated on either side of a fault line with a base line of several km?

      Regards,

      Chris Chapman
Subject: PcAnywhere versions From: "Barry" gbl@....... Date: Tue, 14 May 2002 19:55:22 -0700 Hi All I don't mean to belabor the question but Has anyone purchased the = latest version (10.5)? My question is this- In connecting a XP operating = to a DOS system I think I need version 10.5 for the guest and 5.0 (for = DOS) for the host. The web site alludes to the fact that more than one = version is on the CD. I couldn't get a response from them asking this = and I hate to buy two programs. Is there more than one version on their = CD? Regards Barry
Hi All
    I don't mean to = belabor the=20 question but  Has anyone purchased the latest version (10.5)? My = question=20 is this- In connecting a XP operating to a DOS system I think I need = version=20 10.5 for the guest and 5.0 (for DOS)  for the host. The web site = alludes to=20 the fact that more than one version is on the CD. I couldn't get a = response from=20 them asking this and I hate to buy two programs. Is there more than one = version=20 on their CD?
Regards
Barry
 
Subject: Re: Interesting article on using GPS receivers as a strong motion sensor From: "Mauro Mariotti" mariotti@......... Date: Wed, 15 May 2002 08:39:56 +0200 Hi All, in Italy University of Camerino placed a couple of these kind of gps = strain meters in two faults 80 km from me. If I will know more I will post more info... Regards Mauro ----- Original Message -----=20 From: ChrisAtUpw@.......... To: psn-l@................. Sent: Wednesday, May 15, 2002 4:00 AM Subject: Re: Interesting article on using GPS receivers as a strong = motion sensor In a message dated 30/04/02, cochrane@.............. writes:=20 = http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=3D15044=20 I wonder if this GPS technique could be adapted to measure = cumulative stress when the Earth compresses or stretches elastically = prior to an Earthquake? Put pairs of receivers well separated on either = side of a fault line with a base line of several km?=20 Regards,=20 Chris Chapman=20
Hi All,
in Italy University of Camerino placed=20 a couple of these kind of gps strain meters
in two faults 80 km from = me.
If I will know more I will post more=20 info...
 
Regards
Mauro
 
----- Original Message -----
From:=20 ChrisAtUpw@.......
Sent: Wednesday, May 15, 2002 = 4:00=20 AM
Subject: Re: Interesting = article on using=20 GPS receivers as a strong motion sensor

In a = message dated=20 30/04/02, cochrane@..............=20 writes:

http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=3D150= 44=20

      I=20 wonder if this GPS technique could be adapted to measure cumulative = stress=20 when the Earth compresses or stretches elastically prior to an = Earthquake? Put=20 pairs of receivers well separated on either side of a fault line with = a base=20 line of several km? =

      Regards,=20

      Chris Chapman=20
Subject: Placer 400 questions... From: Andrew Williss bigwill@................ Date: Wed, 15 May 2002 21:26:54 +0930 Hello to all on this list... I have aquired a Placer 400 gps unit as a surplus item, and I'm trying to get the thing talking to the computer... if I plug it into a serial port and run a terminal program, I can see the unit putting out data, but it is garbage. changing the baud rate, number of stop bits, parity and flow control paramaters changes the length of the garbled info, but doesn't fix the problem. I'm assuming I should get a sentence of data with a time and date, plus the position... Does anyone know what sort of data comes out the serial port of this unit? Is it plain 'ol serial data (i.e. 9600 baud 8N1)? Or am I dealing with a proprietry data format and I need a special program? I see back in '99 a few posts were made on this list in regard to this unit and a couple mention a GPSSK.EXE program. Do I need this file to make the unit work? I have tried the trimble website but the model is no longer listed on the site and I can't find a reference to the GPSSK.EXE file... Can anyone help? I would like to hear from you! Thanks, Andrew Williss - VK5LA Winkie, South Australia __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Placer 400 questions... From: ChrisAtUpw@....... Date: Wed, 15 May 2002 09:09:33 EDT In a message dated 15/05/02, bigwill@................ writes: > I have aquired a Placer 400 gps unit as a surplus item, and I'm trying to > get the thing talking to the computer... if I plug it into a serial port > and run a terminal program, I can see the unit putting out data, but it is > garbage. www.google.com produces 1020 hits for Placer 400 GPS. It might be worth a search.... Regards, Chris Chapman In a message dated 15/05/02, bigwill@................ writes:

I have aquired a Placer 400 gps unit as a surplus item, and I'm trying to get the thing talking to the computer... if I plug it into a serial port and run a terminal program, I can see the unit putting out data, but it is garbage.
      www.google.com produces 1020 hits for Placer 400 GPS. It might be worth a search....

      Regards,

      Chris Chapman
Subject: working From: "JORD" jord@............ Date: Wed, 15 May 2002 10:31:14 -0400 Thank You for your help Larry all is now working well Thanks=20 Randy......
Thank You  for your help = Larry
all is now working well
 
Thanks
Randy......
 
Subject: Re: Placer 400 questions... From: Andrew Williss bigwill@................ Date: Thu, 16 May 2002 07:52:35 +0930 5/15/02 10:39:33 PM, ChrisAtUpw@....... wrote: > > > From: ChrisAtUpw@....... > Date: Wed, 15 May 2002 09:09:33 EDT > > Subject:Re: Placer 400 questions... > To: psn-l@.............. > > > > In a message dated 15/05/02, bigwill@................ writes: > > > > I have aquired a Placer 400 gps unit as a surplus item, and I'm trying to > get the thing talking to the computer... if I plug it into a serial port and > run a terminal program, I can see the unit putting out data, but it is > garbage. > > > > www.google.com produces 1020 hits for Placer 400 GPS. It might be > > worth a search.... > > > Regards, > > Chris Chapman Yes that's right , but sorting thru them doesn't get you very far...(believe me. I've tried!) That's how I found this list... does anyone have a copy of the GPSSK.EXE program they could email me? Thanks, Andrew Williss - VK5LA Winkie, South Australia __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Placer 400 From: Andrew Williss bigwill@................ Date: Thu, 16 May 2002 19:34:50 +0930 5/16/02 10:41:07 AM, ChrisAtUpw@....... wrote: > > > From: ChrisAtUpw@....... > Date: Wed, 15 May 2002 21:11:07 EDT > > Subject:Re: Placer 400 questions... > To: bigwill@................ > > > > In a message dated 15/05/02, bigwill@................ writes: > > > > > www.google.com produces 1020 hits for Placer 400 GPS. It might be > > worth a search.... > > Regards, > > Chris Chapman > > Yes that's right , but sorting thru them doesn't get you very far...(believe > me. I've tried!) That's how I found this list... > does anyone have a copy of the GPSSK.EXE program they could email me? > > Thanks, > Andrew Williss - VK5LA > Winkie, South Australia > > > > I do not have a copy. Try entering GPSSK.EXE into www.google.com and > > clicking on the links to find some users? > > > Regards, > > Chris Chapman That's the first thing I did...all the hits refer to this mailing list!!!!! Does anyone on the list have a copy of the program that they could perhaps email to me? I would gladly send them something in return... maybe something uniquely australian? Cheers! Andrew Williss - VK5LA Winkie, South Australia __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Placer 400 From: Tobin Fricke tobin@....... Date: Thu, 16 May 2002 12:34:47 +0200 (CEST) On Thu, 16 May 2002, Andrew Williss wrote: > > I do not have a copy. Try entering GPSSK.EXE into www.google.com= and > That's the first thing I did...all the hits refer to this mailing list!!!= !! > Does anyone on the list have a copy of the program that they could perhap= s email to me? > I would gladly send them something in return... maybe something uniquely = australian? It appears that the Placer-400 is manufactured by Trimble Navigation, a well-known GPS manufacturer. http://www.gpsgis.com/gpshard.html | Trimble Placer-400 Trimble Navigation, Sunnyvale, CA | | The Trimble Placer-400 is essentially an Sveesix core module in a | standard enclosure with a serial and power connector. The Placer-400 is c= onfigured | with the Trimble ASCII Interface Protocol (TAIP) , which is designed for | AVL applications. The Placer is available in both differential and | non-differential models. Does your GPS say "Trimble" on it anywhere? Or, for that matter, "Sveesix"? Trimble has a web page for what I presume to be a newer model, the Placer 450: http://www.trimble.com/placer450455.html . The "Trimble ASCII Interface Protocol" sounds like it's what you need to research in order to be able to talk to the GPS. A search turns up lots of links, including a protocal specification at www.agp.ru/oem/download/genf/taip.pdf and the directory http://www.agp.ru/oem/download/genf/ seems to have some other goodies as well. This should have all the information you need to write a simple program to talk to the GPS. Hope this helps. H=E4lsningar fr=E5n Sverige, Tobin __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Placer 400 questions... From: John Lahr johnjan@........ Date: Thu, 16 May 2002 18:41:55 -0600 Hi Andrew, I have a Placer 400 and actually found the file gpssk.exe that you are looking for. I'll send it to you in a separate message, as attachments can't be included on the psn list. Cheers, John At 07:52 AM 5/16/2002 +0930, you wrote: >Yes that's right , but sorting thru them doesn't get you very >far...(believe me. I've tried!) >That's how I found this list... >does anyone have a copy of the GPSSK.EXE program they could email me? > >Thanks, > >Andrew Williss - VK5LA >Winkie, South Australia > > > > > > > > > > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. John C. Lahr 1925 Foothills Road Golden, CO 80402 Phone: (303) 215-9913 john@........ http://lahr.org/john-jan/ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: sps settings From: "Steve Hammond" shammon1@............. Date: Sun, 19 May 2002 22:50:16 -0700 Hi-- I was looking at the MID-ATLANTIC RIDGE data from NC2 in NJ and DW1/2 in LA and noticed that they were both at set at 5 SPS. I was wondering if you sample at this rate all the time or if the data has been edited to this sample rate? I'm using a 12-bit A/D and the best resolution I've been able to get has been above 25 SPS. Are you using Larry's A/D board? Steve Hammond PSN Aptos, CA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: PSN LIST AUCTION From: "Bryan&Regina Goss" bgoss@....... Date: Tue, 21 May 2002 02:07:06 -0500 I will be selling my entire seismograph system Ok here is what I got and my cost not yours read the bottom thanks Computer = Pentium 133mhz 5Gig drive $100 16 bit A/D board rev3 $245.00 Seismic Amplifier/Filter Board Seismograph two channels $145.00, and $15.00 power supply Seismic Amplifier/Filter Board Seismograph one channel $100.00, and $15.00 power supply Pickup Coil $15.00 I have two of these Magnet The magnet is rated at 22 lbs of pull $20.00 I have 4 of these GPS Timing System and Antenna $240.00 The plexi glass cost $200.00 that covers the Seismograph but I am not counting this it would be hard to ship but if you want it let me know .. Also you will get the Lehman seismograph itself cost about $75.00 This is over $1,000 My cost, It is an awsom setup but I just dont have time for it so I will take the best offer sent to me and yes I want to sell it all at once if I can if not then Ill part it out. I guess this can be a privite auction on the list so send me your offers I would like to get at least $500.00 I will wait a few days please email me questont to: bgoss@....... for pictures go to .............. http://www.1goss.com/seis.htm this is just seismo for pics of boards go to Larry's Sight http://www.seismicnet.com/ If you wish to see seismo working on computer pic took 5-21-02 http://www.1goss.com/seismograph.jpg Bryan S Goss Corinth Ms, 38834 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: PSN LIST AUCTION From: "Bryan&Regina Goss" bgoss@....... Date: Tue, 21 May 2002 05:01:38 -0500 Sorry, should have been clearer and need to add this I will take the largest bid submitted to me by Friday at 5:00 CST so far = it is $500.00 Yes I will take PayPal but they charge me 7% so I need to add this if = you pay via PayPal The person who buys the complete Seismograph station setup will need to = pay for the shipping I am not sure how much this will be I am in Corinth = MS 38834 and will ship UPS ground just a guess could be as much as $75 Larry, I will try not to use the list for this anymore except Friday to = let everyone know the winning amount Pleas use my email bgoss@....... and not the list Thanks Bryan S Goss
 Sorry, should have been = clearer and need=20 to add this
 
I will take the largest bid = submitted to me by=20 Friday at 5:00 CST so far it is $500.00
 
Yes I will take PayPal but they charge = me 7% so I=20 need to add this if you pay via PayPal
 
The person who buys the complete = Seismograph=20 station setup will need to pay for the shipping I am not sure how much = this will=20 be I am in Corinth MS 38834 and will ship UPS ground just a guess could = be as=20 much as $75
 
Larry, I will try not to use the list = for this=20 anymore except Friday to let everyone know the winning = amount
 
Pleas use my email bgoss@....... and not the list Thanks = Bryan S=20 Goss
 
 
Subject: Quarkquakes From: "Larry Cochrane" cochrane@.............. Date: Tue, 21 May 2002 21:34:06 -0700 All, Interesting article... http://www.telegraph.co.uk/news/main.jhtml?xml=%2Fnews%2F2002%2F05%2F12%2Fwn ugg12.xml You many need to cut and paste two lines. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Quarkquakes From: steve hammond shammon1@............. Date: Wed, 22 May 2002 08:43:07 -0700 Very interesting. An odd thought... This could also be the explanation for human spontaneous combustion. If you got hit by one of these you would probably burst into flames. -----Original Message----- From: Larry Cochrane [SMTP:cochrane@............... Sent: Tuesday, May 21, 2002 9:34 PM To: psn-l@.............. Subject: Quarkquakes All, Interesting article... http://www.telegraph.co.uk/news/main.jhtml?xml=%2Fnews%2F2002%2F05%2F12% 2Fwn ugg12.xml You many need to cut and paste two lines. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Fw: Information on effect of infrasound on psychology etc From: "David Collier" dc888@.......... Date: Fri, 24 May 2002 11:05:56 +1000 On or around 21 Dec 1999 there was a message from 'Frank' asking for the = above. Recommend you look at 'Vibroacoustic disease: the need for a new = attitude towards noise.' by Mariana Alves-Pereira & Nuno Castelo Branco, = CITIDEP 2000. on the net. They found suicidal tendencies and a lot more serious stuff besides. This is a major issue for all industrialised countries; my own research = suggests that the estimated 100,000 per annum deaths from DVT syndrome = in airline passegers is linked to prolonged exposure to infrasound = generated by jet engines (25-30 Hz exhaust resonance transformed into a = passenger compartment resonant air pressure oscillation at around 6 Hz). Regards, David Collier
 
On or around = 21 Dec 1999=20 there was a message from 'Frank' asking for the above.
Recommend you look at 'Vibroacoustic = disease: the=20 need for a new attitude towards noise.' by Mariana Alves-Pereira & = Nuno=20 Castelo Branco, CITIDEP 2000. on the net.
They found suicidal tendencies and a = lot more=20 serious stuff besides.
This is a major issue for all = industrialised=20 countries; my own research suggests that the estimated 100,000 per = annum=20 deaths from DVT syndrome in airline passegers is linked to prolonged = exposure to=20 infrasound generated by jet engines (25-30 Hz exhaust resonance = transformed into=20 a passenger compartment resonant air pressure oscillation at around = 6=20 Hz).
Regards,
David = Collier
Subject: Re: Information on effect of infrasound on psychology etc From: "Erich Kern" efkern@............. Date: Thu, 23 May 2002 20:41:51 -0700 Hello David and all of those of feeble mind who may be pre-disposed to take this nonsense seriously: David; while I admire your courage in proposing an obviously loosing, outrageous and scientifically unsupportable position; your words qualify for our most prestigious award. That would be the internationally coveted "Ambulance chasing pseudo-science nutcase and part-time fabricator of innovative psychological disorders" award. David, please acquire honest employment and stop flogging your "new attitudes towards noise" nonsense. We've made five round trips between the U.K. and the U.S. during the past 11 years and aside from cramped quarters and deficient sleep for a few days, have suffered no ill effects. Yours is a fabricated claim bar none. Please just get an honest job and end your quest for the holy grail of victimhood protected by the good offices of whatever loosing politicians need a cause of the day /// cause celebre. Reading again your email, forwarded to many friends and parties interested in persuing relentlessly those who would game the system for personal gain, and with considerable glee at your obvious marketing of victimhood and ancillary dysfunctionalities I remain eternally grateful to you for having provided us with so focussed an example of intellectual flatulence. Erich Kern ----- Original Message ----- From: "David Collier" To: Sent: Thursday, May 23, 2002 6:05 PM Subject: Fw: Information on effect of infrasound on psychology etc On or around 21 Dec 1999 there was a message from 'Frank' asking for the above. Recommend you look at 'Vibroacoustic disease: the need for a new attitude towards noise.' by Mariana Alves-Pereira & Nuno Castelo Branco, CITIDEP 2000. on the net. They found suicidal tendencies and a lot more serious stuff besides. This is a major issue for all industrialised countries; my own research suggests that the estimated 100,000 per annum deaths from DVT syndrome in airline passegers is linked to prolonged exposure to infrasound generated by jet engines (25-30 Hz exhaust resonance transformed into a passenger compartment resonant air pressure oscillation at around 6 Hz). Regards, David Collier __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Information on effect of infrasound on psychology etc From: "Mark Robinson" mark.robinson@............... Date: Fri, 24 May 2002 16:35:10 +1200 > Hello David .... Erich, There is absolutely no call or excuse for this abuse. I suggest an apology is in order. Mark Robinson __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Quark quakes From: Victor.Taylor@......... Date: Fri, 24 May 2002 12:33:30 -0400 http://www.telegraph.co.uk/news/main.jhtml?xml=%2Fnews%2F2002%2F05%2F12%2Fwn ugg12.xml -----Original Message----- From: shammon1@............. [mailto:shammon1@.............. Sent: Wednesday, May 22, 2002 11:43 AM To: psn-l@.............. Subject: RE: Quarkquakes Very interesting. An odd thought... This could also be the explanation for human spontaneous combustion. If you got hit by one of these you would probably burst into flames. -----Original Message----- From: Larry Cochrane [SMTP:cochrane@............... Sent: Tuesday, May 21, 2002 9:34 PM To: psn-l@.............. Subject: Quarkquakes All, Interesting article... http://www.telegraph.co.uk/news/main.jhtml?xml=%2Fnews%2F2002%2F05%2F12% 2Fwn ugg12.xml You many need to cut and paste two lines. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: large event 5/24 11:13PM PST From: steve hammond shammon1@............. Date: Fri, 24 May 2002 23:18:51 -0700 A large long period event is coming in. Is anybody else recording it? Steve Hammond PSN Aptos, CA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: "Mauro Mariotti" mariotti@......... Date: Sat, 25 May 2002 08:19:04 +0200 I have it, very clear, I would like to post on PSN but i don't remember the mail address to post the events. Mauro - Italy ----- Original Message ----- From: "steve hammond" To: "'psn mail list'" Sent: Saturday, May 25, 2002 8:18 AM Subject: large event 5/24 11:13PM PST > A large long period event is coming in. Is anybody else recording it? > Steve Hammond > PSN Aptos, CA > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: Canie canie@........... Date: Fri, 24 May 2002 23:21:42 -0700 It looks like there was something in Alaska about 10:36pm PDT Canie At 11:18 PM 5/24/02 -0700, you wrote: >A large long period event is coming in. Is anybody else recording it? >Steve Hammond >PSN Aptos, CA >__________________________________________________________ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: Karl Cunningham karlc@.......... Date: Fri, 24 May 2002 23:24:10 -0700 Loud and clear. Looks like it might be the Aleutians to me. 4600km distance M6.9. Karl Cunningham --On Friday, May 24, 2002 23:18 -0700 steve hammond wrote: > A large long period event is coming in. Is anybody else recording it? > Steve Hammond > PSN Aptos, CA > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: large event 5/24 11:13PM PST From: steve hammond shammon1@............. Date: Fri, 24 May 2002 23:31:39 -0700 events@.............. It has been rolling my two Lehmans now for several minutes. Here is the event post email address. Steve Hammond PSN Aptos, CA -----Original Message----- From: Mauro Mariotti [SMTP:mariotti@.......... Sent: Friday, May 24, 2002 11:19 PM To: psn-l@.............. Subject: Re: large event 5/24 11:13PM PST I have it, very clear, I would like to post on PSN but i don't remember the mail address to post the events. Mauro - Italy ----- Original Message ----- From: "steve hammond" To: "'psn mail list'" Sent: Saturday, May 25, 2002 8:18 AM Subject: large event 5/24 11:13PM PST > A large long period event is coming in. Is anybody else recording it? > Steve Hammond > PSN Aptos, CA > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: "Larry Cochrane" cochrane@.............. Date: Fri, 24 May 2002 23:31:04 -0700 Mauro and other PSN Station Operators, Event files should be sent to the following email address event@.............. Regards, Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Mauro Mariotti" To: Sent: Friday, May 24, 2002 11:19 PM Subject: Re: large event 5/24 11:13PM PST > I have it, very clear, I would like to post on PSN but i don't remember the > mail address to post the events. > Mauro - Italy > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: large event 5/24 11:13PM PST From: steve hammond shammon1@............. Date: Fri, 24 May 2002 23:44:59 -0700 The first event file triggered here at 04:56 UTC 5/25/02. I'm still capturing the second event file which must be the L waves and they look significant on both of my Lehmans. Steve Hammond PSN Aptos, CA -----Original Message----- From: Canie [SMTP:canie@............ Sent: Friday, May 24, 2002 11:22 PM To: psn-l@.............. Subject: Re: large event 5/24 11:13PM PST It looks like there was something in Alaska about 10:36pm PDT Canie At 11:18 PM 5/24/02 -0700, you wrote: >A large long period event is coming in. Is anybody else recording it? >Steve Hammond >PSN Aptos, CA >__________________________________________________________ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: "Mauro Mariotti" mariotti@......... Date: Sat, 25 May 2002 08:53:17 +0200 Hi, I posted my event files. It result at about 9160km from me. (Italy) It is compatible with Alaska region. Mauro __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: "Mark Robinson" mark.robinson@............... Date: Sat, 25 May 2002 18:54:28 +1200 > A large long period event is coming in. Is anybody else recording it? > Steve Hammond > PSN Aptos, CA http://www.emsc-csem.org/cgi-bin/ALERT_all_messages.sh?1 2002/05/25 05:57 A SED 2002/05/25 05:49 Mm = 6.1 A EVRO 2002/05/25 05:48 A SED 2002/05/25 05:36:59.0 58.3N 162.9W M 6.1 A INGV BRISTOL BAY, ALASKA. 2002/05/25 05:36:37.7 54.0N 161.5W 30 Mb5.8 A ODC ALASKA PENINSULA. 2002/05/25 05:36:33.0 54.8N 176.1W Mm5.9 A TBGS BERING SEA 2002/05/25 05:36:32.0 53.6N 176.7E 33 Mb5.5 A LDG RAT ISLANDS, ALEUTIAN IS. Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: Hammonds hammond@........... Date: Sat, 25 May 2002 01:20:42 -0800 25 MAY 2002 (145) EPAD ot = 05:36:31.89 +/- 0.35 SOUTH OF ALASKA lat = 53.931 +/- 4.5 lon = -161.274 +/- 4.5 MAGNITUDE 6.0 (GS) dep = 33.0 (normal depth) 90 miles (145 km) SW of Chernabura Island, Alaska (pop < 100) 100 miles (165 km) SSW of Sand Point, Alaska 660 miles (1065 km) SW of Anchorage, Alaska 1070 miles (1725 km) W of JUNEAU, Alaska __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: large event 5/24 11:13PM PST From: Hammonds hammond@........... Date: Sat, 25 May 2002 01:45:05 -0800 U.S. GEOLOGICAL SURVEY NATIONAL EARTHQUAKE INFORMATION CENTER World Data Center for Seismology, Denver The following is from the United States Geological Survey, National Earthquake Information Center: Preliminary hypocenter for earthquake of 2002 May 25, SOUTH OF ALASKA, about 90 miles (145 km) SW of Chernabura Island, Alaska: latitude 53.9 degrees north, longitude 161.3 degrees west, origin time 05 36 31.9 utc, depth normal, magnitude 6.0. The magnitude and location may be revised when additional data and further analysis results are available. There have been no reports of damage. Bob Hammond APSN, Fairbanks, Alaska http://apsn.awcable.com __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: large event 5/24 11:13PM PST From: "kArEEm" temp@............. Date: Sat, 25 May 2002 08:34:00 -0700 I really wish I could increase the gain on my PS2 to record it. I didn't record it. Kareem El Sobrante, California 3 blocks from Hayward Fault zone -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of steve hammond Sent: Friday, May 24, 2002 11:19 PM To: 'psn mail list' Subject: large event 5/24 11:13PM PST A large long period event is coming in. Is anybody else recording it? Steve Hammond PSN Aptos, CA __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: xearth From: "Jan D. Marshall" jandmarshall@............ Date: Sat, 25 May 2002 10:42:11 -0600 This is a very interesting -- I have not seen it talked about here = before http://www.hewgill.com/xearth/ It displays the earth and shows the location of current seismic activity Jan D. Marshall WB7COX Nampa, Idaho jandmarshall@............ www.cableone.net/jandmarshall
This is a very interesting  -- I = have not seen=20 it talked about here before
 
http://www.hewgill.com/xearth/
 
It displays the earth and shows the = location of=20 current seismic activity
 
 
 
Jan D. Marshall
WB7COX
Nampa, = Idaho
jandmarshall@............www.cableone.net/jandmarsha= ll
Subject: Fw: xearth From: "Jan D. Marshall" jandmarshall@............ Date: Sat, 25 May 2002 15:09:13 -0600 This is a very interesting -- I have not seen it talked about here = before http://www.hewgill.com/xearth/ It displays the earth and shows the location of current seismic activity Jan D. Marshall WB7COX Nampa, Idaho jandmarshall@............ www.cableone.net/jandmarshall
This is a very interesting  -- I = have not seen=20 it talked about here before
 
http://www.hewgill.com/xearth/
 
It displays the earth and shows the = location of=20 current seismic activity
 
 
 
Jan D. Marshall
WB7COX
Nampa, = Idaho
jandmarshall@............www.cableone.net/jandmarsha= ll
Subject: GPS-DCF77 converter From: "Mauro Mariotti" mariotti@......... Date: Mon, 27 May 2002 08:37:05 +0200 Hi All, in Europe is very popular the use of radio controlled clocks based on the DCF77 standard using a Time-Code format. Explanation on how and where the signal is received are available at the following link: http://www.infoeq.it/doc07_e.htm There are many equipments, that uses this standard for time syncronization. Considering the limitation of the reception of this radio signal (3000km from Germany) and the major importance (and precision) of the GPS systems the following interface has been developed. http://www.infoeq.it/doc16_e.htm It is a GPS-DCF77 converter. This mean that the TIME information coming from GPS satellites is converted in a stable DCF77 pulsing signal and can be used to syncronize DCF77 syncronized digitizers. It is probably that the people far more than 3000 km from Germany and using equipment with dcf77 input andnot GPS input are already organized themselves to use the GPS with their machines, but maybe also others that have DCF77 machines would want to save money purchasing an amateur style GPS-DCF77 interface. Furthermore, DCF77 is not well received all the time, (it is very sensitive to VLF noise due its carrier is modulated at 77,5 Khz) and someone would like to have a more stable receiver. Who is interested on this interface can keep check its web page because soon a schematic will be provided and a pre-programmed microcontroller will be available. Regards Mauro Mariotti www.infoeq.it __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Trying to find a substitute SMTP host name From: ACole65464@....... Date: Mon, 27 May 2002 09:46:12 EDT Hello All, I have a question to AOL users who are able to submit data files to the PSN list. Since AOL can not provide a SMTP host name like another ISP, what do you type in the field under the title of "SMTP Host Name" to allow your data files to be uploaded to the list? I would like to submit data files also, but I am hung up on this piece of info. Thanks for your help. Allan Coleman __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Trying to find a substitute SMTP host name From: RLLaney@....... Date: Mon, 27 May 2002 12:46:57 EDT In a message dated 5/27/02 9:46:34 AM Eastern Daylight Time, ACole65464@....... writes: > I have a question to AOL users who are able to submit data files to the PSN > list. Since AOL can not provide a SMTP host name like another ISP, what do > you type in the field under the title of "SMTP Host Name" to allow your > data > files to be uploaded to the list? I would like to submit data files also, > but > I am hung up on this piece of info. Thanks for your help. > > Allan Coleman > Hi Allan: I had the same problem. I contacted Larry and he suggested using mail1.webtronics.com for the SMTP Host Name. It works OK for me. Bob Laney Herndon, VA In a message dated 5/27/02 9:46:34 AM Eastern Daylight Time, ACole65464@....... writes:


I have a q uestion to AOL users who are able to submit data files to the PSN
list. Since AOL can not provide a SMTP host name like another ISP, what do
you type in the field under the title of "SMTP Host Name" to allow your data
files to be uploaded to the list? I would like to submit data files also, but
I am hung up on this piece of info. Thanks for your help.

Allan Coleman


Hi Allan:

I had the same problem.  I contacted Larry and he suggested using

       mail1.webtronics.com

for the SMTP Host Name.  It works OK for me.

Bob Laney
Herndon, VA Subject: 8 second Microseisms From: Stephen & Kathy skmort@.......... Date: Thu, 30 May 2002 09:08:40 -0700 FYI,, I noticed a strangeness in the background noise today as I was checking my traces, so I did an FFT and discovered that they had a period of about 8 seconds,, as compared to the normal 4.5 to 5.5 that I've noticed over the years for Northern California! Anyone have any idea why???? Could this be caused by the hurricane,, or is something else going on??? I verified that it was not my machine by checking with the Berkeley "make your own seismogram" link!! http://quake.geo.berkeley.edu/bdsn/make_seismogram.html I haven't noticed such long period microseisms before,,, perhaps I just wasn't looking?? Stephen PSN Station #55 near Pilot Hill Ca 38.828N 120.979W __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 8 second Microseisms From: "Mauro Mariotti" mariotti@......... Date: Thu, 30 May 2002 18:50:19 +0200 Hi, the best way to identify a strange signal is to transform some hours of recording in audio wav files. Arie Verveer should have a tool to be used with SDR. Interesting result are came out listening background noise. See the topic of phonoseismology on my web siter www.infoeq.it Regards Mauro ----- Original Message ----- From: "Stephen & Kathy" To: "PSN-list" Sent: Thursday, May 30, 2002 6:08 PM Subject: 8 second Microseisms > FYI,, I noticed a strangeness in the background noise today as I was checking my > traces, so I did an FFT and discovered that they had a period of about 8 > seconds,, as compared to the normal 4.5 to 5.5 that I've noticed over the years > for Northern California! Anyone have any idea why???? Could this be caused > by the hurricane,, or is something else going on??? I verified that it was not > my machine by checking with the Berkeley "make your own seismogram" link!! > > http://quake.geo.berkeley.edu/bdsn/make_seismogram.html > > I haven't noticed such long period microseisms before,,, perhaps I just wasn't > looking?? > > Stephen > PSN Station #55 > near Pilot Hill Ca > 38.828N 120.979W > __________________________________________________________ > > 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: 8 second Microseisms From: RLLaney@....... Date: Thu, 30 May 2002 14:22:02 EDT In a message dated 5/30/02 12:09:36 PM Eastern Daylight Time, skmort@.......... writes: > I haven't noticed such long period microseisms before,,, perhaps I just > wasn't > looking?? > Hi: They are appearing here on the east coast as well. Bob Laney Herndon, VA In a message dated 5/30/02 12:09:36 PM Eastern Daylight Time, skmort@.......... writes:


I haven't noticed such long period microseisms before,,,   perhaps I just wasn't
looking??


Hi:

They are appearing here on the east coast as well.

Bob Laney
Herndon, VA Subject: Re: 8 second Microseisms From: Jim ODonnell jimo17@........ Date: Thu, 30 May 2002 13:12:44 -0700 Hi - Your astute observations on microseisms can be continued further by reading what the late Sean Morrisey of SLU had to say. See http://psn.quake.net/psnlist/index99.html Subject: 6-second microseisms From: S-T Morrissey sean@........... Date: Mon, 30 Aug 1999 23:57:18 -0500 (CDT) Also enjoyed seeing Mauro's Web page! See the topic of phonoseismology on his web site www.infoeq.it Regards....Jim O/UNLV On Thu, 30 May 2002 09:08:40 -0700 Stephen & Kathy writes: > FYI,, I noticed a strangeness in the background noise today as I > was checking my > traces, so I did an FFT and discovered that they had a period of > about 8 > seconds,, as compared to the normal 4.5 to 5.5 that I've noticed > over the years > for Northern California! Anyone have any idea why???? Could > this be caused > by the hurricane,, or is something else going on??? I verified > that it was not > my machine by checking with the Berkeley "make your own seismogram" > link!! > > http://quake.geo.berkeley.edu/bdsn/make_seismogram.html > > I haven't noticed such long period microseisms before,,, perhaps I > just wasn't > looking?? > > Stephen > PSN Station #55 > near Pilot Hill Ca > 38.828N 120.979W > __________________________________________________________ > > 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. >
Hi - Your astute observations on microseisms can be continued further = by=20 reading what the late Sean Morrisey of SLU had to say.  See http://psn.quake.net/= psnlist/index99.html
Subject: 6-second microseisms
From: S-T Morrissey=20 sean@...........
Date: Mon, 30 Aug 1999 23:57:18 -0500 (CDT)
 
Also enjoyed seeing Mauro's Web page! See the topic of=20 phonoseismology on his web site www.infoeq.it
 
Regards....Jim= =20 O/UNLV
 
On Thu, 30 May 2002 09:08:40 -0700 Stephen & Kathy <skmort@..........> writes:
>= =20 FYI,,   I noticed a strangeness in the background noise today as = I=20
> was checking my
> traces, so I did an FFT and discovered = that=20 they had a period of
> about 8
> seconds,,   as = compared=20 to the normal 4.5 to 5.5 that I've noticed
> over the years
> = for=20 Northern California!    Anyone have any idea=20 why????    Could
> this be caused
> by the=20 hurricane,, or is something else going on???   I verified
>= ;=20 that it was not
> my machine by checking with the Berkeley "make your= own=20 seismogram"
> link!!
>
> http://= quake.geo.berkeley.edu/bdsn/make_seismogram.html
>=20
> I haven't noticed such long period microseisms before,,, &= nbsp;=20 perhaps I
> just wasn't
> looking??
>
> &= nbsp;=20 Stephen
>   PSN Station #55
>   near Pilot = Hill=20 Ca
>   38.828N  120.979W
>=20 __________________________________________________________
>
>= =20 Public Seismic Network Mailing List (PSN-L)
>
> To leave this = list=20 email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See= http://www.seismicnet.com/= maillist.html=20 for more information.
>
 
Subject: Re: 8 second Microseisms From: "Mark Robinson" mark.robinson@............... Date: Fri, 31 May 2002 10:29:49 +1200 > FYI,, I noticed a strangeness in the background noise today as I was checking my > traces, so I did an FFT and discovered that they had a period of about 8 > seconds,, as compared to the normal 4.5 to 5.5 that I've noticed over the years > for Northern California! Anyone have any idea why???? Could this be caused > by the hurricane,, or is something else going on??? I verified that it was not > my machine by checking with the Berkeley "make your own seismogram" link!! > > http://quake.geo.berkeley.edu/bdsn/make_seismogram.html > > I haven't noticed such long period microseisms before,,, perhaps I just wasn't > looking?? > > Stephen > PSN Station #55 > near Pilot Hill Ca > 38.828N 120.979W Hurricane huh, must be hitting Hawaii pretty hard, have a quick look at LISS http://aslwww.cr.usgs.gov/Seismic_Data/telemetry_data/KIP_24hr.html before it expires or at a cached version at http://203.79.120.108/hawaii.200205302156.gif Mark __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 8 second Microseisms From: ian ian@........... Date: Thu, 30 May 2002 12:51:17 -1000 Ehm,

no hurricane here in Hawaii, a bright sunny day in fact.

What it may be is the volcano causing what you see on the Kipapa station.  I know there has been a bit of extra activity lately, described as long period small quakes.  Another station here which is also showing activity is the Poha station, http://aslwww.cr.usgs.gov/Seismic_Data/telemetry_data/POHA_24hr.html ..  The volcano's daily status can be checked at  http://hvo.wr.usgs.gov/kilauea/update/main.html  One key phrase from today's bulletin is "Kilauea is really jumping".

My own geophone seismometer isn't showing anything untoward - http://www.iasmith.com/realtime.htm - but my experimantal tiltmeter is picking up similar traces to those seen at Kipapa and Pahoa stations.

Could be interesting...

Ian Smith

Mark Robinson wrote:
FYI,,   I noticed a strangeness in the background noise today as I was
checking my
traces, so I did an FFT and discovered that they had a period of about 8
seconds,,   as compared to the n
ormal 4.5 to 5.5 that I've noticed over
the years
for Northern California!    Anyone have any idea why????    Could this be
caused
by the hurricane,, or is something else going on???   I verified that it
was not
my machine by checking with the Berkeley "make your own seismogram" link!!

http://quake.geo.berkeley.edu/bdsn/make_seismogram.
html

I haven't noticed such long period microseisms before,,,   perhaps I just
wasn't
looking??

  Stephen
  PSN Station #55
  near Pilot Hill Ca
  38.828N  120.979W

              

Hurricane huh, must be hitting Hawaii pretty hard, have a quick look at LISS
http://aslwww.cr.usgs.gov/Se
ismic_Data/telemetry_data/KIP_24hr.html before
it expires or at a cached version at
http://203.79.120.108/hawaii.200205302156.gif

Mark

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Subject: Re: 8 second Microseisms From: ChrisAtUpw@....... Date: Thu, 30 May 2002 21:18:00 EDT In a message dated 30/05/02, skmort@.......... writes: > I noticed a strangeness in the background noise today as I was checking my > traces, so I did an FFT and discovered that they had a period of about 8 > seconds, as compared to the normal 4.5 to 5.5 that I've noticed over the > years > for Northern California! Anyone have any idea why? Could this be caused > by the hurricane, or is something else going on? Hi Stephen, The weather in the Atlantic has not been to good lately. Searching back through the PSN files turned up a letter from Sean :- "Re: 6-second microseisms and hurricanes: An interesting phenomenon in the eastern USA is that when a largewind storm due to a deep barometric low occurs off the east coast, particularly off of New England, the wave energy pounding on the continental shelf propagates through the lithosphere under the eastern USA as a 6-second surface wave, at about half the period of the oceanic wave. This is also true of any storm off the east coast, except that the period will be different, varying from 4 to 10 seconds. Storms off the southwest coast cause a longer storm wave, but the predominant energy is still from 5 to 8 seconds." Regards, Chris Chapman In a message dated 30/05/02, skmort@.......... writes:

I noti ced a strangeness in the background noise today as I was checking my
traces, so I did an FFT and discovered that they had a period of about 8
seconds, as compared to the normal 4.5 to 5.5 that I've noticed over the years
for Northern California!  Anyone have any idea why?  Could this be caused
by the hurricane, or is something else going on?   
Hi Stephen,

      The weather in the Atlantic has not been to good lately. Searching back through the PS N files turned up a letter from Sean :-

      "Re: 6-second microseisms and hurricanes: An interesting phenomenon in the eastern USA is that when a largewind storm due to a deep barometric low occurs off the east coast, particularly off of New England, the wa ve energy pounding on the continental shelf propagates through the lithosphere under the eastern USA as a 6-second surface wave , at about half the period of the oceanic wave. This is also true of any storm off the east coast, except that the period will be different, varying from 4 to 10 seconds.  Storms off the southwest coast cause a longer storm wave, but the predominant energy is still from 5 to 8 seconds."

      Regards,

      Chris Chapman Subject: Re: 8 second Microseisms From: Stephen & Kathy skmort@.......... Date: Thu, 30 May 2002 19:09:17 -0700 Thanks Chris and ALL,,, hind sight is great,,, now that I have been referred to it, I remember Sean's comments!!! Apparently, the hurricane off the west coast of Baja and the storms in the atlantic are doing what is expected and what they normally do,, sending waving notices far and wide,, ha!! Stephen __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Very Cool Program From: "Jan D. Marshall" jandmarshall@............ Date: Thu, 30 May 2002 21:27:28 -0600 I haven't seen anyone discuss this on this forum yet -- this Web site = has a very slick program that acts as wall paper -- it is a globe that = rotates and shows all of the current quake activity for the last several = days -- it is really cool. It update automatically with the lastest = information. http://www.hewgill.com/xearth/ Jan D. Marshall WB7COX Nampa, Idaho jandmarshall@............ www.cableone.net/jandmarshall
I haven't seen anyone discuss this on = this forum=20 yet -- this Web site has a very slick program that acts as wall paper -- = it is a=20 globe that rotates and shows all of the current quake activity for the = last=20 several days -- it is really cool. It update automatically with the = lastest=20 information.
 
http://www.hewgill.com/xearth/
 
 
Jan D. Marshall
WB7COX
Nampa, = Idaho
jandmarshall@............www.cableone.net/jandmarsha= ll
Subject: Re: 8 second Microseisms From: Karl Cunningham karlc@.......... Date: Thu, 30 May 2002 20:28:22 -0700 Stephen -- I'm seeing the same thing in Southern California, and it has increased substantially this afternoon. See http://www.keckec.com/images/current.kc1.gif The amplitude is quite large too. There are two storm systems off Baja California (one off northern Baja and the other southwest of the tip) that I suspect are responsible. Tropical storms and hurricanes (usually later in the season) are often responsible for large background noise, even when they are 1500 miles away. Karl Cunningham --On Thursday, May 30, 2002 09:08 -0700 Stephen & Kathy wrote: > FYI,, I noticed a strangeness in the background noise today as I was > checking my traces, so I did an FFT and discovered that they had a period > of about 8 seconds,, as compared to the normal 4.5 to 5.5 that I've > noticed over the years for Northern California! Anyone have any idea > why???? Could this be caused by the hurricane,, or is something else > going on??? I verified that it was not my machine by checking with the > Berkeley "make your own seismogram" link!! > > http://quake.geo.berkeley.edu/bdsn/make_seismogram.html > > I haven't noticed such long period microseisms before,,, perhaps I just > wasn't looking?? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 8 second Microseisms From: "Jan D. Marshall" jandmarshall@............ Date: Thu, 30 May 2002 21:35:52 -0600 Jan D. Marshall WB7COX Nampa, Idaho jandmarshall@............ www.cableone.net/jandmarshall ----- Original Message ----- From: "Karl Cunningham" To: Sent: Thursday, May 30, 2002 9:28 PM Subject: Re: 8 second Microseisms Stephen -- I'm seeing the same thing in Southern California, and it has increased substantially this afternoon. See http://www.keckec.com/images/current.kc1.gif The amplitude is quite large too. There are two storm systems off Baja California (one off northern Baja and the other southwest of the tip) that I suspect are responsible. Tropical storms and hurricanes (usually later in the season) are often responsible for large background noise, even when they are 1500 miles away. Karl Cunningham --On Thursday, May 30, 2002 09:08 -0700 Stephen & Kathy wrote: > FYI,, I noticed a strangeness in the background noise today as I was > checking my traces, so I did an FFT and discovered that they had a period > of about 8 seconds,, as compared to the normal 4.5 to 5.5 that I've > noticed over the years for Northern California! Anyone have any idea > why???? Could this be caused by the hurricane,, or is something else > going on??? I verified that it was not my machine by checking with the > Berkeley "make your own seismogram" link!! > > http://quake.geo.berkeley.edu/bdsn/make_seismogram.html > > I haven't noticed such long period microseisms before,,, perhaps I just > wasn't looking?? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Seismometry From: John & Jan johnjan@........ Date: Thu, 30 May 2002 21:56:38 -0600 A friend passed along this reference to a "good set of notes on seismometry by wielandt:" http://www.geophys.uni-stuttgart.de/seismometry/man_html/man2001.html Cheers, John John C. Lahr 1925 Foothills Road Golden, CO 80402 Phone: (303) 215-9913 john@........ http://jjlahr.com/science __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: R: Very Cool Program From: "Liberio Rossi" liberossi@......... Date: Fri, 31 May 2002 05:59:40 +0200 dear Jan, I am I5WC, one of the older italian Amateur and I very appreciated the = program "Xearth" that is used regularly. Have you got any suggest to update the version I am using ( 1.2000). My name is Liberio Rossi and the E-mail is liberossi@......... The town is Lucca in Tuscany (50 miles from Florence) My best 73's to you=20 Lib. ----- Original Message -----=20 From: Jan D. Marshall=20 To: Sesmic List Server=20 Sent: Friday, May 31, 2002 5:27 AM Subject: Very Cool Program I haven't seen anyone discuss this on this forum yet -- this Web site = has a very slick program that acts as wall paper -- it is a globe that = rotates and shows all of the current quake activity for the last several = days -- it is really cool. It update automatically with the lastest = information. =20 http://www.hewgill.com/xearth/ =20 =20 Jan D. Marshall WB7COX Nampa, Idaho jandmarshall@............ www.cableone.net/jandmarshall
dear Jan,
I am I5WC, one of the older italian = Amateur =20 and I very appreciated the program "Xearth" that is used = regularly.
Have you got any suggest to update the = version I am=20 using ( 1.2000).
My  name is Liberio Rossi and the = E-mail is liberossi@.........
 
The town is Lucca in Tuscany (50 miles = from=20 Florence)
My best 73's to you
Lib.
----- Original Message -----
From:=20 Jan=20 D. Marshall
Sent: Friday, May 31, 2002 5:27 = AM
Subject: Very Cool = Program

I haven't seen anyone discuss this on = this forum=20 yet -- this Web site has a very slick program that acts as wall paper = -- it is=20 a globe that rotates and shows all of the current quake activity for = the last=20 several days -- it is really cool. It update automatically with the = lastest=20 information.
 
http://www.hewgill.com/xearth/
 
 
Jan D. Marshall
WB7COX
Nampa, = Idaho
jandmarshall@............www.cableone.net/jandmarsha= ll
Subject: siesmograph jug on ebay From: BOB BARNS royb1@........... Date: Mon, 03 Jun 2002 09:30:13 -0400 Hi gang, "Early Oilfield Seismograph Jug", Item # 2109674943 ends 6/9 is offered on ebay. Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: MEMSIC Accelerometers From: Doug Crice dcrice@............ Date: Mon, 03 Jun 2002 09:21:08 -0700 I saw some low-cost MEMS accelerometers at the Sensors Expo that looked interesting as strong-motion sensors. http://www.memsic.com/default.asp Anybody know anything about these units? -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: MEMSIC Accelerometers From: Doug Crice dcrice@............ Date: Mon, 03 Jun 2002 12:42:51 -0700 I neglected to mention that the MEMSIC sensors are less than $10. Probably they aren't interesting to the PSN, but if you wanted to instrument a high-rise or a bridge really cheap, they might be. Doug ChrisAtUpw@....... wrote: > In a message dated 03/06/02, dcrice@............ writes: > > I saw some low-cost MEMS accelerometers at the Sensors Expo that > looked interesting as strong-motion sensors. > http://www.memsic.com/default.asp > > > > Hi Doug, > > Looking through the data sheets, the minimum noise is 0.3 milli g > / root Hz, so at 10 Hz you would see about 1 milli g noise. The output > sensitivity is quite temperature dependant. They don't sound very exciting. > > The ADXL05 is obsolete and has been replaced by the ADXL105 at 225 > micro g / root Hz. . > > Quoting Larry's findings:- > > The main difference between the ADXL05 and the Kinemetrics FBA-23A > is the amount of background noise from the sensor itself. The ADXL05 > sensor has about +/-3 mg of internal noise and FBA-23A has less than 1 mg. > > Looking at Kinemetrics literature, they quote noise levels of the > order of 1 micro g. > > I would not expect to see a great deal of improvement for the best > Memsic over the ADXL105. Maybe there is a difference in price? > > The 3022's are quoted as giving 1 micro V p-p noise for 8 to 20 mV > / g output to 50 Hz, which sounds about a factor of 10 better than the > ADXL105. > > Regards, > > Chris Chapman. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: MEMSIC Accelerometers From: ChrisAtUpw@....... Date: Tue, 4 Jun 2002 13:35:50 EDT In a message dated 03/06/02, dcrice@............ writes: > I neglected to mention that the MEMSIC sensors are less than $10. > Probably they aren't interesting to the PSN, but if you wanted to > instrument a high-rise or a bridge really cheap, they might be. Hi Doug, No offense meant and I thank you sincerely for bringing the Memsics to our attention, but you did suggest their application as strong motion sensors and ask if anyone knew anything about them? These are very clever little devices which have a wide range of applications, but with the temperature scale drift a function of T^2.67, giving about 1% / C deg, offset drift and a minimum noise of ~0.3 milli g / root Hz, they do not seem to be much better suited for seismic observations than the ADXL05, which several of us found just a bit disappointing. Regards, Chris Chapman In a message dated 03/06/02, dcrice@............ writes:

I negl ected to mention that the MEMSIC sensors are less than $10.
Probably they aren't interesting to the PSN, but if you wanted to instrument a high-rise or a bridge really cheap, they mig ht be.
Hi Doug,

      No offense meant and I thank you sincerely for bringing the Memsics to our attention, but you did suggest their application as strong motion sensors and ask if anyone knew anything about them?  
      These are very clever little devices which have a wide range of applications, but with the temperature scale drift a function of T^2.67, giving about 1% / C deg, offset drift and a minimum noise of ~0.3 milli g / root Hz, they do not seem to be much better suited for seismic observations than the ADXL05, which several of us found just a b it disappointing.
      
      Regards,

      Chris Chapman Subject: connector for a Geotec S-500 From: "angel@......... angel@chiriqui.com Date: Wed, 5 Jun 2002 12:45:36 -0500 Hi Everyone, I have a Geotec S-500 for which I need a connector and a while back there was a thread about which connector it was and where I might be able to get one. I also looking for a connector for a Kinemetics FBA-3 which is called out in the manual as a MS3106E-20-29P, I did find that at Mouser for $25.00 and was wondering if anyone had one in their junk box that they would part with for less. Best regards, angel mailto:angel@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: WQ zoom From: "Francesco" franuc@......... Date: Thu, 6 Jun 2002 00:42:05 +0200 Hi Larry. Today I've updated Winquake with new 2.8.9 release. All works fine, except the window's zoom feature that seems disabled. Wq runs on my Win2000 main pc. No problem with another pc (Win98). Can I do? Regards Francesco - Italy - __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: connector for a Geotec S-500 From: BOB BARNS royb1@........... Date: Wed, 05 Jun 2002 20:12:22 -0400 Angel, I don't know what the S-500 needs. I have a SL-220 and bought the manual and the connector from Teledyne Geotech, 3401 Shiloh Rd., Garland, Texas 75041 1-214-221-0000. I talked to them on the 'phone and they were very helpful. Each cost $35. The connector is a Bendix PTO6A-14-18P (SR) Bob "angel@chiriqui" wrote: > > Hi Everyone, > > I have a Geotec S-500 for which I need a connector and a while back > there was a thread about which connector it was and where I might be > able to get one. > > I also looking for a connector for a Kinemetics > FBA-3 which is called out in the manual as a MS3106E-20-29P, I did find > that at Mouser for $25.00 and was wondering if anyone had one in their > junk box that they would part with for less. > > Best regards, > angel mailto:angel@............ > > __________________________________________________________ > > 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: WQ zoom From: "Larry Cochrane" cochrane@.............. Date: Thu, 6 Jun 2002 03:38:20 -0700 Hi Francesco, Works fine on my Win2k system and no one else has reported a problem with the zoom feature. As far as I remember I have not changed the software code that handles this feature so I'm not sure what the problem could be? Regards, Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Francesco" To: "PSN" Sent: Wednesday, June 05, 2002 3:42 PM Subject: WQ zoom > Hi Larry. > > Today I've updated Winquake with new 2.8.9 release. > > All works fine, except the window's zoom feature that seems disabled. > Wq runs on my Win2000 main pc. > > No problem with another pc (Win98). > > Can I do? > > Regards > > Francesco - Italy - > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: WQ zoom From: steve hammond shammon1@............. Date: Thu, 6 Jun 2002 08:55:15 -0700 Hi Larry and Francesco, this also works fine on Win ME. Steve Hammond PSN Aptos, CA -----Original Message----- From: Larry Cochrane [SMTP:cochrane@............... Sent: Thursday, June 06, 2002 3:38 AM To: psn-l@.............. Subject: Re: WQ zoom Hi Francesco, Works fine on my Win2k system and no one else has reported a problem with the zoom feature. As far as I remember I have not changed the software code that handles this feature so I'm not sure what the problem could be? Regards, Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Francesco" To: "PSN" Sent: Wednesday, June 05, 2002 3:42 PM Subject: WQ zoom > Hi Larry. > > Today I've updated Winquake with new 2.8.9 release. > > All works fine, except the window's zoom feature that seems disabled. > Wq runs on my Win2000 main pc. > > No problem with another pc (Win98). > > Can I do? > > Regards > > Francesco - Italy - > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Direction of orientation of SG sensor From: David Findlay david@.............. Date: Mon, 10 Jun 2002 18:41:04 +1000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Which directions does the pendulum of an SG sensor swing, towards the either of the plates or between them? And how do you ensure that they never touch? Thanks, David -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9BGYjx58m2d272NoRArUKAKCMOycwS4UEXgOyzE6apsiukpvuJwCfXmae INnPp/JBLSeHPlM6T5smgJc= =aZWP -----END PGP SIGNATURE----- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Direction of orientation of SG sensor From: "Larry Cochrane" cochrane@.............. Date: Mon, 10 Jun 2002 21:21:49 -0700 David, The transmitter plate connects up to the pendulum. This plate is placed between the two receiver antenna plates. The transmitter plate swings toward either of the two receiver plates. There is no harm if the transmitter plate touches either of the receivers but the sensor will saturate will before this can happen. Only moving the sensor or a large local event would make the plates touch. Hope this helps. -Larry Cochrane Redwood City, PSN > Which directions does the pendulum of an SG sensor swing, towards the either > of the plates or between them? And how do you ensure that they never touch? > Thanks, > > David __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Large quake right now From: Hammonds hammond@........... Date: Mon, 10 Jun 2002 21:15:56 -0800 P arrival time 05:11:04 UTC at GSV. Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Large quake right now From: David Findlay david@.............. Date: Tue, 11 Jun 2002 15:21:12 +1000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 11 Jun 2002 15:15, you wrote: > P arrival time 05:11:04 UTC at GSV. Any idea of distance yet? Where is GSV? Thanks, David -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9BYjIx58m2d272NoRAp7yAJ9B7j6Fq4fvPMT0NVrLXOnxhp1FYACbB5tb /lvFXzKNtw0ulYGEaCgCbOA= =VA8P -----END PGP SIGNATURE----- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Large quake right now From: Hammonds hammond@........... Date: Mon, 10 Jun 2002 21:26:11 -0800 PSN station GSV is at 64.92N, 147.94W. I cannot see any other phases except the P arrival. It's a global quake, look at: http://aslwww.cr.usgs.gov/Seismic_Data/heli2.shtml It's all across those stations. Bob http://apsn.awcable.com At 09:21 PM 6/10/2002, you wrote: >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >On Tue, 11 Jun 2002 15:15, you wrote: > > P arrival time 05:11:04 UTC at GSV. > >Any idea of distance yet? Where is GSV? Thanks, > >David >-----BEGIN PGP SIGNATURE----- >Version: GnuPG v1.0.6 (GNU/Linux) >Comment: For info see http://www.gnupg.org > >iD8DBQE9BYjIx58m2d272NoRAp7yAJ9B7j6Fq4fvPMT0NVrLXOnxhp1FYACbB5tb >/lvFXzKNtw0ulYGEaCgCbOA= >=VA8P >-----END PGP SIGNATURE----- >__________________________________________________________ > >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: Large quake right now From: David Findlay david@.............. Date: Tue, 11 Jun 2002 15:36:46 +1000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 11 Jun 2002 15:26, you wrote: > PSN station GSV is at 64.92N, 147.94W. I cannot see any other phases > except the P arrival. > It's a global quake, look at: > http://aslwww.cr.usgs.gov/Seismic_Data/heli2.shtml Interesting. Am I correct in saying that the biggest readings are in North East Asia? Therefore could it be in that area, or aren't those readings in the same scale? Are there any S waves there? Looks big anyway. Haven't heard anything on the radio about it yet. Thanks, David -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9BYxvx58m2d272NoRApSuAJ4ttPk1oAzeJrK9ScEZZUoogeM5dACffU3M p3g2jkw5xeIRDJ4PwcrN7S4= =+DHR -----END PGP SIGNATURE----- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Large quake right now (NOT!) From: Hammonds hammond@........... Date: Mon, 10 Jun 2002 21:39:21 -0800 Oh, hell, never mind. It's a "big" 4.5 about 3.3 degrees away from me. I just got excited and emailed before engaging the brain. Sorry folks, Bob At 09:21 PM 6/10/2002, you wrote: >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >On Tue, 11 Jun 2002 15:15, you wrote: > > P arrival time 05:11:04 UTC at GSV. > >Any idea of distance yet? Where is GSV? Thanks, > >David >-----BEGIN PGP SIGNATURE----- >Version: GnuPG v1.0.6 (GNU/Linux) >Comment: For info see http://www.gnupg.org > >iD8DBQE9BYjIx58m2d272NoRAp7yAJ9B7j6Fq4fvPMT0NVrLXOnxhp1FYACbB5tb >/lvFXzKNtw0ulYGEaCgCbOA= >=VA8P >-----END PGP SIGNATURE----- >__________________________________________________________ > >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: Large quake right now (NOT!) From: David Findlay david@.............. Date: Tue, 11 Jun 2002 15:48:19 +1000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 11 Jun 2002 15:39, you wrote: > Oh, hell, never mind. It's a "big" 4.5 about 3.3 degrees away from me. > I just got excited and emailed before engaging the brain. Well then what's all that stuff on the other sensors that seem to be at the same time or nearby? The station in Hailar china's gone mad..... Just lots of little stuff? Thanks, David -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9BY8kx58m2d272NoRAs5fAJ9aREAVY1f6HaEp+27Ke6ZQpqV6bwCZARin KrizyjHd47JKcn3MO6CPtcQ= =2zVs -----END PGP SIGNATURE----- __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Eclipse-earthquake connection From: Bob Fryer bfryer@............ Date: Tue, 11 Jun 2002 01:14:29 -0700 Hi gang, Remember that Mr Lee (Hawaii) reported several years ago on the Eclipse-earthquake connection. Areas along the path of totality, especially, will have a major increase in the probabilty for a large quake for the next week. A magnitude 7 event would not be surprising on or near the path of totality -- read Southern Mexico and Central America, as well as areas in the Pacific. Fortunately this does not include California -- we hope. Can anyone find a good source for the paths of totality? I've done some searching, but meager results so far. Note that Mt St Helens had a total eclipse in June (?) 1979 [I got some interesting pics.]. Rauscher and Van Bise told me last month that they detected the first pre-eruption signals circa Oct.-Nov. 1979 -- a good 3 months before geophysicists reported activity. Take care, Bob F -- earthquake WARNING research Animals, People, Scientific Evidence www.earthquakewarning.org __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Moment Magnitude article From: Doug Crice dcrice@............ Date: Tue, 11 Jun 2002 03:03:39 -0700 There's a pretty well=written article on "moment magnitude" in today's San Jose Mercury News. Usually when journalists try and write about technical issues, they don't do this well. http://www.siliconvalley.com/mld/siliconvalley/3442305.htm __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Eclipse-earthquake connection From: "Art Kapoor/Judy Haxo" akr@......... Date: Tue, 11 Jun 2002 05:53:30 -0700 For a good description of paths of totality (or any other information regarding eclipses) check out Sky and Telescope magazine. They all have a website. Art ----- Original Message ----- From: "Bob Fryer" To: Sent: Tuesday, June 11, 2002 1:14 AM Subject: Eclipse-earthquake connection > Hi gang, > > Remember that Mr Lee (Hawaii) reported several years ago on the > Eclipse-earthquake connection. > > Areas along the path of totality, especially, will have a major > increase in the probabilty for a large quake for the next week. A > magnitude 7 event would not be surprising on or near the path of > totality -- read Southern Mexico and Central America, as well as > areas in the Pacific. Fortunately this does not include California > -- we hope. > > Can anyone find a good source for the paths of totality? I've done > some searching, but meager results so far. > > Note that Mt St Helens had a total eclipse in June (?) 1979 [I got > some interesting pics.]. Rauscher and Van Bise told me last month > that they detected the first pre-eruption signals circa Oct.-Nov. > 1979 -- a good 3 months before geophysicists reported activity. > > Take care, > Bob F > -- > earthquake WARNING research > Animals, People, Scientific Evidence > www.earthquakewarning.org > __________________________________________________________ > > 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: Diamagnetic Graphite From: ChrisAtUpw@....... Date: Tue, 11 Jun 2002 11:55:05 EDT Hi All, In response to James Spottiswoode's graphite seis rig at http://www.jsasoc.com/diamagnetic_suspension_seismomet.htm I took a magnet setup into my local arts materials / stationery suppliers and went through their stock of pencil leads. I can confirm that Faber Castell O.7 mm x 60 mm 2B leads are strongly diamagnetic. 12 off cost $1. None of the larger ~1/16" leads that I tried were diamagnetic. Cyanoacrylate glues seem to stick graphite more or less OK. Epoxy will stick Graphite very well, but it doesn't like water at all. Cold Graphite is covered with several layers of water and you have to drive this off first, by heating it to more than 150 C before you can glue it with Epoxy. Possible heating sources are hotplates on electric stoves and soldering irons. Epoxy is mildly diamagnetic. Regards, Chris Chapman Hi All,

      In response to James Spottiswoode's graphite seis rig at http://www.jsasoc.com/diamagn etic_suspension_seismomet.htm I took a magnet setup into my local arts materials / stationery suppliers and went through their stock of pencil leads. I can confirm that Faber Castell O.7 mm x 60 mm 2B leads are strongly diamagnetic. 12 off cost $1. None of the larger ~1/16" leads that I tried were diamagnetic.

      Cyanoacrylate glues seem to stick graphite more or less OK. Epoxy will stick Graphite very well, but it doesn't like water at all. Cold Graphite is covered with several layers of water and you have to drive this o ff first, by heating it to more than 150 C before you can glue it with Epoxy. Possible heating sources are hotplates on electri c stoves and soldering irons. Epoxy is mildly diamagnetic.

      Regards,

      Chris Chapman Subject: Re: Diamagnetic Graphite From: meredithlamb meredithlamb@............. Date: Tue, 11 Jun 2002 11:51:01 -0600 Hi Chris and all, Excellent work Chris!!! Just finding good diamagnetic material is rather very rare, and to have it commercially available and also strongly diamagnetic (a form of pure graphite) is very significant indeed! In another relation to James website; the specific magnet/s used are currently being re-ordered by Forcefield/Wondermagnet, so the availability of such "could be" in the neighborhood of a number of weeks (5-7 weeks?). One precaution; the magnets need to be handled with alot of care, they do break easily.... one needs to firmly but gently, slide, the magnets onto iron/steel. I think myself, that after viewing James seismograms, the instrumental response was rather good for nearby and/or the stronger distant quakes. For the very small size of the diamagnetic sensor itself, I think its most significant! Along with the graphite and magnets, it would seem like this approach in the sense of cost is really going cheap....and now (soon) quite available. ChrisAtUpw@....... wrote: > Hi All, > > In response to James Spottiswoode's graphite seis rig at > http://www.jsasoc.com/diamagnetic_suspension_seismomet.htm I took a > magnet setup into my local arts materials / stationery suppliers and > went through their stock of pencil leads. I can confirm that Faber > Castell O.7 mm x 60 mm 2B leads are strongly diamagnetic. 12 off cost > $1. None of the larger ~1/16" leads that I tried were diamagnetic. > > Cyanoacrylate glues seem to stick graphite more or less OK. > Epoxy will stick Graphite very well, but it doesn't like water at all. > Cold Graphite is covered with several layers of water and you have to > drive this off first, by heating it to more than 150 C before you can > glue it with Epoxy. Possible heating sources are hotplates on electric > stoves and soldering irons. Epoxy is mildly diamagnetic. Good glueing notes Chris. I've used Permabond 268 once recently on graphite, and it seems to hold very well once cured (no prior heating). Its also easy to sand/file off any excess. Permabond F246 (that you've recommended also), is also excellent but expensive and difficult to obtain in America. I think instant glues eventually separate as they are not too water/moisture resistant. Its a big unknown world with various glues around to try. Take care, Meredith Hi Chris and all,

Excellent work Chris!!!  Just finding good diamagnetic material is
rather very rare, and to have it commercially available and also
strongly diamagnetic (a form of pure graphite) is very significant
indeed!

In another relation to James website; the specific magnet/s
used are currently being re-ordered by Forcefield/Wondermagnet,
so the availability of such "could be" in the neighborhood of a
number of weeks (5-7 weeks?).  One precaution; the magnets
need to be handled with alot of care, they do break easily....
one needs to firmly but gently, slide, the magnets onto iron/steel.

I think myself, that after viewing James seismograms, the instrumental
response was rather good for nearby and/or the stronger distant quakes.
For the very small size of the diamagnetic sensor itself, I think its most
significant!  Along with the graphite and magnets, it would seem like this
approach in the sense of cost is really going cheap....and now (soon)
quite available.
 

ChrisAtUpw@....... wrote:

Hi All,

      In response to James Spottiswoode's graphite seis rig at h ttp://www.jsasoc.com/diamagnetic_suspension_seismomet.htm I took a magnet setup into my local arts materials / stationery suppliers and went through their stock of pencil leads. I can confirm that Faber Castell O.7 mm x 60 mm 2B leads are strongly diamagnetic. 12 off cost $1. None of the larger ~1/16" leads that I tried were diamagnetic.

      Cyanoacrylate glues seem to stick graphite more or less OK. Epoxy will stick Graphite very well, but it doesn't like water at all. Cold Graphite is covered with several layers of water and you have to drive this off first, by heating it to more than 150 C before you can glue it with Epoxy. Possible heating sources are hotplates on electric stoves and soldering irons. Epoxy is mildly diamagnetic.


Good glueing notes Chris.  I've used Permabond 268 once recently on
graphite, and it seems to hold very well once cured (no prior heating).
Its also easy to sand/file off any excess.  Permabond F246 (that you've
recommended also), is also excellent but expensive and difficult to
obtain in America.  I think instant glues eventually separate as they
are not too water/moisture resistant.  Its a big unknown world with
various glues around to try.

Take care, Meredith
 
 

  Subject: Another size diamagnetic pencil lead that works. From: meredithlamb meredithlamb@............. Date: Tue, 11 Jun 2002 15:12:42 -0600 Hi Chris and all, Evidently there is a number of pencil "refill" or "propelling" leads that are diamagnetic. I couldn't find the Faber Castell 2B leads you mentioned right off in Denver. However, I did luck out with a Faber Castell "super polymer", code: 1.4B, that is also diamagnetic. Its 1.4mm or ~ .053" in diameter x 60mm or ~ 2.395" long. Black plastic case with a green plastic cap atop the case which holds 6 leads. Price here, around $3.25, but from a independent art supply retailer. All the leads seemed to be levitating equally in height or distance from the magnets...but of course, theres no quarantee that the manufacturer is really consistent in the graphite purity of product. Got immediate levitation with a 8 magnet assembly here, but of course with a short period ~ 1.5 to 2 seconds. I tried a 6 magnet assembly with a lead, but the lead looks like it needs to either be cut down in length, or, perhaps a added weight "might" help with a centering/oscillating and levitating action. I also tried putting two leads side by side and levitating on a 8 magnet assembly, and that also works. Not as much lift spacing between the leads and magnets of course, but the oscillation period seemed to slightly increase to ~ 2-3 seconds. The 2 leads levitated as a platform of equal height...convenient for any light/photo cell aluminum "flag" mounting, and/or damping medium. Haven't tried it yet, but having 3 leads together could also possibly work. From the ends view they might look like a triangle (of circles). That arrangement might need clearance sanding....but it might also be too heavy? (This approach is very light fly weight) Most interesting; thanks James and Chris! Take care, Meredith Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Diamagnetic seis housings From: ChrisAtUpw@....... Date: Tue, 11 Jun 2002 23:00:50 EDT Hi All, The Graphite rod diamagnetic seis setups need to be well protected from light, drafts, etc. I have used two housings. The first was an inverted Aluminium Bread Tin from the cookery section of my local supermarket. It can provide electromagnetic screening. These are deep pressings and can be made completely airtight, unlike the folded tin ones. The second was a heavy rigid oblong plastic dish which is used to supply Pate at the Delicatessen counter. They were giving these away free. Regards, Chris Chapman Hi All,

      The Graphite rod diamagnetic seis setups need to be well protected from light, drafts, etc. I have used two housings. The first was an inverted Aluminium Bread Tin from the cookery section of my local supermarket. It can provide electromagnetic screening. These are deep pressings and can be made completely airtight, unlike the folded tin ones. The second was a heavy rigid oblong plastic dish which is used to supply Pate at the Delicatessen counter. They were givi ng these away free.

      Regards,

      Chris Chapman Subject: Integration and Winquake From: Arie Verveer ajbv@............ Date: Tue, 25 Jun 2002 11:28:43 +0000 Hi, Just a small question; When integrating data with Winquake does anyone now the integration period.? I would assume the integrated value is the sum of the y values times 1/ ( sample rate ) over the length of the integration period? . I'm probably wrong, any idea's. Cheers Arie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Save our Pledge of Allegiance From: "Bryan&Regina Goss" bgoss@....... Date: Thu, 27 Jun 2002 04:44:48 -0500 SAN FRANCISCO, California (CNN) -- A federal appeals court ruled = Wednesday that reciting the Pledge of Allegiance in public schools is an = unconstitutional=20 I think this is a teriable ruling by our courts. I would like for people = to put their name on cnn feadback page if you agree pleas foward this to = all your contacts in your address book and friends. Here is the link to = the cnn feadback page http://www.cnn.com/feedback/ I dont want america pushed around by a = minority of people who are ofended by things like this I cant belive someone is ofended by the Pledge of Allegiance how = prepostrous.........

SAN FRANCISCO, California (CNN) = -- A=20 federal appeals court ruled Wednesday that reciting the Pledge of = Allegiance in=20 public schools is an unconstitutional
 
I think this is a teriable = ruling by our=20 courts. I would like for people to put their name on cnn feadback page = if you=20 agree pleas foward this to all your contacts in your address book = and=20 friends.  Here is the link to the cnn feadback = page
http://www.cnn.com/feedback= / I=20 dont want america pushed around by a minority of people who are ofended = by=20 things like this
I cant belive someone is ofended by = the Pledge of=20 Allegiance how prepostrous.........
Subject: Re: Save our Pledge of Allegiance From: "Bryan&Regina Goss" bgoss@....... Date: Thu, 27 Jun 2002 04:50:03 -0500 SAN FRANCISCO, California (CNN) -- A federal appeals court ruled = Wednesday that reciting the Pledge of Allegiance in public schools is an = unconstitutional=20 I think this is a terrible ruling by our courts. I would like for = people to put their name on cnn feedback page if you agree pleas forward = this to all your contacts in your address book and friends. Here is the = link to the can feedback page http://www.cnn.com/feedback/ I don't want America pushed around by a = minority of people who are offended by things like this I cant believe someone is offended by the Pledge of Allegiance how = preposterous......... After spell check did not mean to send rough draft
 
 
SAN FRANCISCO, California (CNN) = -- A=20 federal appeals court ruled Wednesday that reciting the Pledge of = Allegiance=20 in public schools is an unconstitutional
 
I think this is a terrible = ruling by our=20 courts. I would like for people to put their name on cnn feedback page = if you=20 agree pleas forward this to all your contacts in your address = book and=20 friends.  Here is the link to the can feedback = page
http://www.cnn.com/feedback= / I=20 don't want America pushed around by a minority of people who are = offended by=20 things like this
I cant believe someone is offended by = the Pledge=20 of Allegiance how preposterous.........
 
After spell check did not mean to = send rough=20 draft
Subject: Re: Save our Pledge of Allegiance From: ChrisAtUpw@....... Date: Thu, 27 Jun 2002 08:38:31 EDT In a message dated 27/06/02, bgoss@....... writes: > SAN FRANCISCO, California (CNN) -- A federal appeals court ruled Wednesday > that reciting the Pledge of Allegiance in public schools is an > unconstitutional > > I think this is a terrible ruling by our courts. I would like for people to > Hi Brian, Regardless of the merits or otherwise of the above decision, your request that we feed our names and addresses to the turkeys in the CNN publicity department is NOT acceptable. Without being rude, does this issue have anything to do with the PSN? Regards, Chris Chapman In a message dated 27/06/02, bgoss@....... writes:

SAN FRANCISCO, California (CNN) -- A federal appeals court ruled Wednesday that reciting the Pledge of Allegiance in public schools is an unconstitutional

I think this is a terrible ruling by our courts. I would like for people to put their name on cnn feedback page


Hi Brian,

      Regardless of the merits or otherwise of the above decision, your request that we feed our names and addresses to the turkeys in the CNN publicity department is NOT acceptable. Without being rude, does this issue have anything to do with the PSN?

      Regards,

      Chris Chapman Subject: Re: Save our Pledge of Allegiance From: "John Tacinelli" John.Tacinelli@........ Date: Thu, 27 Jun 2002 08:52:52 -0500 As an atheist and an American I agree with the court's ruling. The phrase = "under god" is unconstitutional under the establishment clause of the = first amendment. It is so clearly unconstitutional I cannot believe = nobody objected before. The authors of the law clearly decided to = establish belief in god as a belief of the government. A teacher = espousing belief in god is a representative of the government and is = prohibited from doing so. =20 John Tacinelli __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Save our Pledge of Allegiance From: Thomas W Leiper twleiper@........ Date: Thu, 27 Jun 2002 10:12:29 -0400 On Thu, 27 Jun 2002 08:52:52 -0500 "John Tacinelli" writes: > As an atheist and an American I agree with the court's ruling. Seems there are always people who are running around trying to find ways to be offended. Many of those who refuse to recite the POA would still refuse even if there were no reference to God, citing other things about the POA that offend their highly developed sensitivities, such as there not being liberty and justice for all, etc. As you peel away the layers of the onion, you find that most of these miserable folks have little belief in anything and are envious and fearful of those who do. God bless them. This sentence refers to seismometers, P-Waves and epicenters, and is attempting to keep the posting on topic, but, barring an act of God, will probably fail. Tom __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: vacation, going nomail From: R&L Thompson rlthompson@................. Date: Thu, 27 Jun 2002 12:10:41 -0230 Tomorrow I'll be going off the list until after our vacation. We're heading to Ohio, and planning to enter the US just north of Plattsburg, NY. I'd appreciate suggestions as to places to see, or shops to visit, that would relate to seismic monitoring, in particular, components for building an amateur sensor. Thanks, Ron -- R & L Thompson, Gander, Newfoundland, Canada, rlthompson@................. , http://home.thezone.net/~rlthomps/ "Who are these that fly as a cloud, and as the doves to their window?" Is 60:8 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Save our Pledge of Allegiance From: "John Tacinelli" John.Tacinelli@........ Date: Thu, 27 Jun 2002 10:37:27 -0500 If you want this to be about seismographs, then stop responding. As for = being offended, I cannot help being offended. Would you object if the POA = included a phrase about "one nation, under no god" ? Of course you would. = The government can't say that. (even though it is true) =20 I suggest the pledge be altered to say "one nation, respecting all = beliefs, with liberty and justice for all." John Tacinelli __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Save our Pledge of Allegiance From: Robert Shannon earth@........... Date: Thu, 27 Jun 2002 09:03:35 -0700 John; Go Away...LARRY! Help! At 08:37 AM 6/27/2002, you wrote: >If you want this to be about seismographs, then stop responding. As for >being offended, I cannot help being offended. Would you object if the POA >included a phrase about "one nation, under no god" ? Of course you >would. The government can't say that. (even though it is true) > >I suggest the pledge be altered to say "one nation, respecting all >beliefs, with liberty and justice for all." > >John Tacinelli __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Piezoelectric seismic sensor From: Steve Bartz sbartz@....... Date: Thu, 27 Jun 2002 11:24:55 -0700 Has anyone ever heard of using a piezoelectric transducer in a force balance accelerometer? I am in the process of building one, and it seems quite sensitive over a broad range of frequencies. Steve Bartz __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Piezoelectric seismic sensor From: R&L Thompson rlthompson@................. Date: Thu, 27 Jun 2002 14:03:25 -0230 I know that piezo electric sensors are used in Rockwell / Collins atrapdown attitude and heading reference system gyros, but they're not force balanced. If I may ask, what are you using for the piezo sensing element, a commercially made unit, or a home made one? Ron T. Steve Bartz wrote: > Has anyone ever heard of using a piezoelectric transducer in a force > balance > accelerometer? I am in the process of building one, and it seems quite > sensitive > over a broad range of frequencies. > > Steve Bartz > > __________________________________________________________ > > 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. -- R & L Thompson, Gander, Newfoundland, Canada, rlthompson@................. , http://home.thezone.net/~rlthomps/ "Who are these that fly as a cloud, and as the doves to their window?" Is 60:8 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Piezoelectric seismic sensor From: R&L Thompson rlthompson@................. Date: Thu, 27 Jun 2002 14:37:21 -0230 Thinking this over a little, could you help me see why it would need to be a force balance sensor. It would appear to me, depending on the design and mechanical connection of the piezo sensor perhaps, that there would be a very limited movement. Ron T. Steve Bartz wrote: > Has anyone ever heard of using a piezoelectric transducer in a force > balance > accelerometer? I am in the process of building one, and it seems quite > sensitive > over a broad range of frequencies. > > Steve Bartz > > __________________________________________________________ > > 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. -- R & L Thompson, Gander, Newfoundland, Canada, rlthompson@................. , http://home.thezone.net/~rlthomps/ "Who are these that fly as a cloud, and as the doves to their window?" Is 60:8 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Piezoelectric seismic sensor From: Jack Ivey ivey@.......... Date: Thu, 27 Jun 2002 13:23:38 -0400 In the more interesting (possibly) than useful category, for a while I was using a disassembled piezo buzzer under one foot of a Lehman to keep it centered. If the boom swung one way I'd increase the DC voltage across the element and if it swung the other I'd decrease it. Worked pretty well within limits, although most people's Lehman probably weigh too much for this to be practical (My bases are made of Al tubing so the whole thing weighs about 5 lb). It seems like you could use a position sensor on the boom, close the loop and use this as a quick and dirty force feedback (tilt feedback?) setup, although I haven't tried it. When I first put the foot of the seismo on the piezo element, I heard a sharp crack and was convinced I had broken it, until I realized that the high voltage generated by the pressure had caused a spark! Jack Ivey KB8SPI > -----Original Message----- > From: Steve Bartz [mailto:sbartz@........ > Sent: Thursday, June 27, 2002 2:25 PM > To: PSN-L > Subject: Piezoelectric seismic sensor > > > Has anyone ever heard of using a piezoelectric transducer in a force > balance > accelerometer? I am in the process of building one, and it > seems quite > sensitive > over a broad range of frequencies. > > Steve Bartz > > > __________________________________________________________ > > 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: Save our Pledge of Allegiance From: xor@........ Date: Thu, 27 Jun 2002 13:56:44 -0400 What about those folks out there that are offended by the lack of God? Are we so afraid of the word God that we must stamp out every reference to a deity in our society? I must point out that the last poll I saw said that around 90% of Americans believe in some god. In a majority rules system like ours, that means they have the right to have god where every they wish. That means the other 10% must accept and adapt to it. It is one thing to have the separation of church and state. But saying "under God" does not violate that. It merely states that we are subject to things higher than we are (earthquakes comes to mind). We are not perfect. We are not infallible. We need guidance sometimes to make the right moral choice. It is so wrong to acknowledge we are... human and not a higher being? Is there a god? I don't know. But who am I to tell someone who does they must keep it in there home or church? I don't have that right and neither should the government or some angry atheist. Its time to not take ourselves so seriously and allow others to express themselves and their faith. It only enriches us to do so. Our children have so little to believe in already. Don't take away what little is left. Anyway, did anyone pick up the quake that was in the Cincinnati area a couple of weeks ago? I did not feel anything in Columbus. It was supposedly a 5.0 Don Stevens Clear Skies! xor@........ Visit an Observatory near you! Perkins Observatory, P.O. Box 449, Delaware, OH 43015 Phone: (740) 363-1257 Fax: (740) 363-1258 www.perkins-observatory.org perkins@.......... John Tacinelli writes: > If you want this to be about seismographs, then stop responding. As for being offended, I cannot help being offended. Would you object if the POA included a phrase about "one nation, under no god" ? Of course you would. The government can't say that . (even though it is true) > > I suggest the pledge be altered to say "one nation, respecting all beliefs, with liberty and justice for all." > > John Tacinelli > > __________________________________________________________ > > 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: Save our Pledge of Allegiance From: "John Tacinelli" John.Tacinelli@........ Date: Thu, 27 Jun 2002 13:34:20 -0500 Offended by the Lack of god? Does this mean we must put god into every = sentence to avoid offending them? That is ridiculous. =20 The first amendment guarantees against a tyranny of the majority. If the = majority wants god in our schools and the pledge then let them repeal the = first amendment. They have that power. They could then pass laws = requiring us to join a church or be jailed. Indeed they could convert all = of us to the majority church. Stamp out all other churches. Many = societies have done so. Many still do. =20 I say we are not subject to higher things. There is no God as a source of = moral authority, nor do we need one. We can be moral on our own. =20 The government does not take sides in such a dispute. The government = says, "take the argument outside where it belongs." JOhn T __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Pledge of Allegiance not for list From: "Bryan&Regina Goss" bgoss@....... Date: Thu, 27 Jun 2002 13:59:36 -0500 I sent Pledge of Allegiance email to all the people in my address list. = I did not intend for the psn-list to get it nor did I intend to get a = debate started. I will keep voicing my opinion but not here pleas don't = discuss this on the list as Larry will probe be less than happy with me = for sending the email.....
I sent Pledge of Allegiance email = to all the=20 people in my address list. I did not intend for the = psn-list to get=20 it nor did I intend to get a debate started. I will keep = voicing my=20 opinion but not here pleas don't discuss this on the list = as=20 Larry will probe be less than happy with me for sending the=20 email.....
Subject: Re: Piezoelectric seismic sensor From: ChrisAtUpw@....... Date: Thu, 27 Jun 2002 16:10:44 EDT In a message dated 27/06/02, sbartz@....... writes: > Has anyone ever heard of using a piezoelectric transducer in a force balance > accelerometer? I am in the process of building one, and it seems quite > sensitive > over a broad range of frequencies. > Steve Bartz Hi Steve, Piezo transducers are not well adapted to a force balance setup. They are basically AC capacitative devices and have a high coefficient of voltage versus temperature. They have a very high leakage resistance when dry, but this can be a limitation in humid conditions. They do make quite reasonable substitutes as uncalibrated geophones and you can get periods of up to about 10 seconds out of them with a TL071 opamp or similar. I can pick up a car on the main highway 1000 yds away. Since they respond up to well over 1 KHz, you do need to filter seriously for seismic applications. One company does produce piezo sensors for seismic use. Regards, Chris Chapman In a message dated 27/06/02, sbartz@....... writes:

Has an yone ever heard of using a piezoelectric transducer in a force balance
accelerometer?  I am in the process of building one, and it seems quite sensitive
over a broad range of frequencies.
Steve Bartz
Hi Steve,

      Piezo transducers are not well adapted to a force balance setup. They are basically AC capacitative devices and have a high coefficient of voltage versus temperature. They have a very high leakage resistance when dry, but this can be a limitation in humid conditions.

      They do make quite reasonable substitutes as uncalibrated geophones and you can get pe riods of up to about 10 seconds out of them with a TL071 opamp or similar. I can pick up a car on the main highway 1000 yds awa y. Since they respond up to well over 1 KHz, you do need to filter seriously for seismic applications.

      One company does produce piezo sensors for seismic use.

      Regards,

      Chris Chapman Subject: Get back on subject, please From: "William B. Combs" bcombs@........ Date: Thu, 27 Jun 2002 18:21:37 -0500 So, take it outside where it belongs, John. John said: The government does not take sides in such a dispute. The government says, "take the argument outside where it belongs." JOhn T __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Two Questions From: "Office of Emperor Norton, Bummer and Lazarus" SFQUAKE06@........... Date: Thu, 27 Jun 2002 05:38:19 -0700 Hello Everyone: I have two questions A) Can anyone tell me the URL of a "map" web site where you can type in = geographical coordinates and a map will be generated centered on those = coordinates? B) Does anyone know of a Japanese web site that is equivalent to the = PSN? Seems to me that Japan should have a large community of amateur = seismologists, given its history of earthquakes. Dave Close

Hello Everyone:

I have two questions

A) Can anyone tell me the URL of a "map" web site where you can type = in=20 geographical coordinates and a map will be generated centered on those=20 coordinates?

B) Does anyone know of a Japanese web site that is equivalent to the = PSN?=20 Seems to me that Japan should have a large community of amateur = seismologists,=20 given its history of earthquakes.

 

Dave Close

Subject: Re: Two Questions From: ChrisAtUpw@....... Date: Thu, 27 Jun 2002 22:09:43 EDT In a message dated 28/06/02, SFQUAKE06@........... writes: > A) Can anyone tell me the URL of a "map" web site where you can type in > geographical coordinates and a map will be generated centered on those > coordinates? Hi Dave, Try www.mapquest.com This oraganisation does maps for a large number of countries. The coordinate mapping command is on the second page, not on the opening page. Regards, Chris Chapman In a message dated 28/06/02, SFQUAKE06@........... writes:

A) Can anyone tell me the URL of a "map" web site where you can type in geographical coordinates and a map will be generated centered on those coordinates?
Hi Dave,

      Try www.mapquest.com This oraganisation does maps for a large number of countries. The coordinate mapping command is on the second page, not on the opening page.

      Regards,

      Chris Chapman Subject: Re: Save our Pledge of Allegiance From: Thomas W Leiper twleiper@........ Date: Thu, 27 Jun 2002 23:42:59 -0400 On Thu, 27 Jun 2002 13:34:20 -0500 "John Tacinelli" writes: [nonsense deleted] > The government says, "take the argument outside where it belongs." And I say the same thing, so get lost. Tom __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Two Questions From: "Finke, John" John.Finke@.......... Date: Fri, 28 Jun 2002 08:02:43 -0400 Try this... http://terraserver.com/ -----Original Message----- From: Office of Emperor Norton, Bummer and Lazarus [mailto:SFQUAKE06@............ Sent: Thursday, June 27, 2002 7:38 AM To: PSN-L@.............. Subject: Two Questions Hello Everyone: I have two questions A) Can anyone tell me the URL of a "map" web site where you can type in geographical coordinates and a map will be generated centered on those coordinates? B) Does anyone know of a Japanese web site that is equivalent to the PSN? Seems to me that Japan should have a large community of amateur seismologists, given its history of earthquakes. Dave Close ====================================================================================== NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipi ent. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If y ou have received this message in error, please notify us immediately by replying to the message and deleting it from your compu ter. ==============================================================================
Try this...
 
-----Original Message-----
From: Office of Emperor Norton, Bummer and Lazarus [mailto:SFQUAKE06@............
Sent: Thursday, June 27, 2002 7:38 AM
To: PSN-L@..............
Subject: Two Questions

Hello Everyone:

I have two questions

A) Can anyone tell me the URL of a "map" web site where you can type in geographical coordinates and a map will be generated centered on those coordinates?

B) Does anyone know of a Japanese web site that is equivalent to the PSN? Seems to me that Japan should have a large community of amateur seismologists, given its history of earthquakes.

 

Dave Close

======================================================================================
NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipi ent. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If y ou have received this message in error, please notify us immediately by replying to the message and deleting it from your compu ter.


==============================================================================

Subject: Re: Integration and Winquake From: "Randall Pratt" randallpratts@.......... Date: Sat, 29 Jun 2002 20:59:43 -0500 Arie, I don't have an answer but I have wondered about this also. I've considered summing as you thought and also the possibility of maybe trapazoidal areas with several points. Another question I have is how the result can begin at other than zero displacement with a velocity sensor and zero time at file start? I wonder if the algorithym starts in the middle or from some average point and works to the ends? Randy ----- Original Message ----- From: "Arie Verveer" To: Sent: Tuesday, June 25, 2002 6:28 AM Subject: Integration and Winquake > Hi, Just a small question; When integrating data with Winquake > does anyone now the integration period.? I would assume the integrated > value is the sum of the y values times 1/ ( sample rate ) over the length > of the integration period? . I'm probably wrong, any idea's. > > > Cheers > > Arie > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Mount Hood... From: "kArEEm" temp@............. Date: Sun, 30 Jun 2002 09:16:55 -0700 What's everyone's guess about Mt. Hood in Oregon or have you been following? There have been a remarkable number of quakes near the cone. Yesterday morning's swarm started with a M4.8 bang and it was followed by at least forty aftershocks. Is she telling us something? USGS Info Kareem Message
What's = everyone's=20 guess about Mt. Hood in Oregon or have you been following? There have = been a=20 remarkable number of quakes near the cone. Yesterday morning's swarm = started=20 with a M4.8 bang and it was followed by at least forty aftershocks.=20
 
Is she telling=20 us something? =
 
USGS=20 Info
 
Kareem
=