HI, I've come to the realization that this value will never be 100% for each
event. I suggest that you try building a table and collect ML values which
can be compared to the three dimensions N/S/Z in your system. Each domain
will be different. In Winquake under the Display/modify sensor information
enter a value that causes your computed ML value to equal the reported then
record this for future reference. For example, the Aptos, CA Z HS10 geophone
is set to .0004, the N is .0007 and the E is .0005. Continue gathering data
until you find a value the provides the best average yielding the best
result. Once you have developed a meaningful correction value, move to SDR
and update the MAG correction value so that it is appended to the event
file. Keep in mind, if you change the gain in your amps, you need to tweak
the value in the sensor information.
Regards, Steve Hammond PSN San Jose, Aptos CA

-----Original Message-----
From: psn-l-request@..............
[mailto:psn-l-request@................. Behalf Of Jón Frímann
Sent: Thursday, November 02, 2006 7:54 AM
To: psn-l@..............
Subject: Re: Calculating magnitude correction for winsdr / winquake ?


Hi

I do think this has worked. I used the M 4.17 event yesterday to
calculate the mag corrention. For that event it did show ML 4.2, for
other events it was either about the correct size or alot smaller.

Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/

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