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
http://voksenlia.net/met/seismometer/
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