Hi Everyone,

First some background... Earthworm, no not the slimy things that crawl underground 
, is a seismic processing package that can run on various platforms. The 
current release of EW can run on Solaris, Windows and Linux. All of the code is open 
source so it can be recompiled on other systems / OSs. Here is a link for more 
information: http://folkworm.ceri.memphis.edu/ew-doc/. Earthworm is used around the 
world by many agencies to record and report earthquake information as well as other 
low frequency stuff like infrasonic data.

A few years ago, when EW was at version 6.x, I added two modules to the release. One 
would directly collect data from a PSN ADC board (PsnAdSend.exe) using a Comm port 
and the other would import data into EW from WinSDR using a TCP/IP connection 
(Ws2Ew.exe). I also created a file (psn4putaway.c) that would allow EW to create PSN 
Type 4 event files compatible with WinQuake.

To add the PSN ADC board to EW I needed to learn enough about it to get the data into 
one of the data rings, data is transported to modules (processes) in EW using rings, 
and verify that the timing and A/D data was correct. I never looked into the more 
complicated modules that do earthquake location and magnitude calculation. One thing 
about EW, its very powerful with lots of modules to process the data in various ways, 
but its a pain in the ass to configure and figure out how to use it.

Currently Earthworm is maintained by ISTI (http://www.isti.com/) and once or twice a 
year they put on a class to help user better understand how to use the more advance 
features of EW. The last class was in December and located in San Fransisco so I was 
able to attend. The class was very informative and I was able to learn how to use 
some of the modules used to locate earthquakes as well as install MySQL to arrive all 
of the waveform data from the various sensors I am monitoring to locate events.

For more information on my setup and current results please see 
http://www.seismicnet.com/ew/.

I have been recording data for about 3 weeks now and so far I have recorded two 
events that triggered 4 or 5 stations to report the P wave arrival times. To locate 
events with just the P wave one needs 4 or more arrive times. This page
http://www.seismicnet.com/ew/LocatedEvents.html has more information.

What I would like to do is add as many local PSN stations as possible to better 
locate events. Since the EW location modules only work on local events, I'm not sure 
about larger regional earthquakes, I only need data from near by stations.

Here is list of requirements if you would like to send in data:

1. You need to run the current beta release of WinSDR. This version will try and 
connect to a client and send data to the client once connected. Older versions of 
WinSDR required a static IP address so clients can connect to it to receive data. 
With this arrangement the user does not need to have a static IP internet connection 
to send data out from WinSDR. A Earthworm module at my end will be used to listen for 
the connections and import the data into EW when the connection is established.

2. You will obviously need a full time DSL or Cable Modem internet connection. WinSDR 
will be sending one 512 byte packet every second so the output bandwidth is very low.

3. Your station location needs to be well located using GPS or Google Earth

4. The current module I am running to pick the P wave does best if the sensor is 
short-period sensor like a geophone. But any sensor that shows the onset of the P 
wave well will do.

5. Your A/D board needs to have a GPS receiver connected to it so the data is 
accurately timestamped.

6. WinSDR needs to be configured to record at 50 Samples Per Second or higher.

If you meet the criteria above please contact me with your station information and I 
will email you information on how to setup your copy of WinSDR to send in data to my 
system.

Regards,
Larry Cochrane
Redwood City, PSN

__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

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