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

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