PSN-L Email List Message

Subject: Re: Earthquake strength
From: Steinar Midtskogen steinar@.............
Date: Thu, 10 Jul 2008 18:46:31 +0200

I wrote earlier today:

> I think I can expect several <1.5 earthquakes a year here in the Oslo
> region and perhaps a couple of slightly stronger ones which are
> usually not felt, but there hasn't been one yet to provide a test.

According to NORSAR there was a 1.0 earthquake 25 km away from here at
12:07:46 today, and sure enough, when I look at my data, I got a big
spike at 12:07:56 roughly at 2.5 Hz.  It was just one short spike
which echoed at most 25 seconds.

Is there a formula which, given the distance from the earthquake, will
give the frequency which is most likely to be the strongest?

Steinar Midtskogen

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