## PSN-L Email List Message

**
Subject: Earthquake strength**

From: Steinar Midtskogen steinar@.............

Date: Tue, 08 Jul 2008 11:08:06 +0200

For my web page I automatically retreave current earthquake data from
USGS and NORSAR in order to make a table of earthquakes which my
instrument should be able to detect. I then calculate arrival times
for the P and S waves and add that to my plot as well.
Quakes that satisfy the equation sqrt(10)^(m+2.5) > d, where m is the
magnitude and d is the distance in km, are currently in my list, and
that limit seems roughly to correspond to what I can detect.
That is, I'm assuming that the strength of an earthquake drops by the
square of the distance. Is that a valid assumptation for earthquakes?
--
Steinar Midtskogen
http://voksenlia.net/met/seismometer/
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