Hello Angel,

JH>    Arrays have a lot of power, even if the instruments are not broadband.
JH> They are usually constructed to study the lithosphere and upper mantle
JH> directly below the array, but more uses have been employed as people tinker
JH> with the data.  There is a ton of literature on this stuff, because everyone
JH> from the oil industry to huge multi-million dollar scientific projects uses
JH> them.  To get a good array going for locating local events you should have at
JH> least three of them in a triangular arrangement.  Being precisely geometrical
JH> with the arrangement is not necessary, because the analysis can handle any
JH> general location.  With five sensors, making a large "X" shape with a sensor
JH> located in the middle is a good arrangment.  If, on the other hand, you want
JH> to study a specific line in the Earth then you just line them up along it.
JH>    You will need separate recording stations each timed using something
JH> accessible to each (eg. GPS).  The most widely used devices for arrays are
JH> part of the PASSCAL array (Passive Array for the Seismic Study of the
JH> Continental Lithosphere or something like that) which are owned and
JH> distributed by the IRIS consortium, of which just about every major university
JH> is a member (www.iris.edu).  They have a nice compact system of broadband
JH> sensors, programmable digital recorders, and power supplies like solar panels.
JH> They probably have tons of stuff on installing and operating these types of
JH> arrays.

Hi John,

I have found two URL's in the last hour and one of them is nice.  why
would each station need it's own GPS if I could get the signals from
the sensor to a main station either using a VCO a transmitter/receiver
and Larry's demodulator then the three or five stations into one of Larry's AtoD
and sdr for later processing??  To keep the power requirments down at
the remote stations it would be nice to have as little electronics as possible.
If the costs and complexity of the telemetry stuff is tooo much I might
be willing to lay cable to each of the remote station. It would be
nice to keep this experiment as simple as possible and still get
usefull data.

http://www-seismo.hannover.bgr.de/geress.html
http://www.geology.smu.edu/~hayward/Txar/index.html



Best regards,
 Angel                            mailto:angel@............



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