All,

For some time now I have been receiving data from several of the broadband
sensors available using the USGS Live Internet Seismic Server
(www.liss.org).  I finally resolved some random crashes in my TCP/IP
receiving program so I can now receive data without restarting the program
every day or two. Last weekend I created a web page and CGI script so that
the data I receive can be access using the Web. 

The URL to the data request page is
http://www.seismicnet.com/bbrequest.html and I've added a link to this page
on my main web page. 

This page is a form that the users fills out with the station(s), channel ,
start date and  time, and output format for the returned event files. I am
currently monitoring 8 stations, each station produces 20 samples/second
BHZ, BHN and BHE files and 1 sample/second LHZ, LHN and LHE files. The
output file(s) can be in either PSN or SAC binary format. You can also view
the event file(s) as a GIF image.

I am currently receiving data from the following stations: HKT in Texas
USA, KIP in Hawaii USA,  ADK Alaska USA, KONO Norway, CTAO Australia, GUMO
Guam, TATO Taiwan and GNI Armenia. I keep the data for 5 days, after that
my system purges the data. Receiving this data only takes about 950 bytes
per second or around 7600 bits per second. With my aDSL line I can get over
150 kbytes (~ 1.2 meg bit) download speeds, unfortunately for people
accessing my web site the out going bandwidth is limited to 128 kbits, so
the usage on my incoming data rate is less then 1%. The problem is the
reliability of the connection to the LISS servers is so so and the LISS
server gets its data from the world wide sensors using the Internet, so the
data can have a lot of holes in it. 

For large events, using the data from your own sensor and a few of the LISS
stations one should be able to locate the event using the new WinQuake
location map feature available in the beta release. I was able to locate
the 7.0Ms  NEW BRITAIN REGION, P.N.G. event to with in 50 km using several
of the LISS stations. I didn't get a clear P and S from my sensors so I
only used the LISS stations to locate the event.

Regards,
Larry Cochrane
Redwood City, PSN





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