We've had a swarm of small quakes in the neighborhood today, with
epicenters that appear to be close to the point where the Calaveras
fault joins the San Andreas fault.  There were over 20 the last time I
counted.  The biggest was 4.1.

http://quake.usgs.gov/recenteqs/Maps/121-36_eqs.htm

On 12/20/08, psn-l-digest-request@..............
 wrote:
>
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> | Message 1                                                           |
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> Subject: Question of amplitude ?
> From:    =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= 
> Date:    Fri, 19 Dec 2008 16:09:06 +0000
>
> Hi all
>
> My lehman type sensor did not pickup the Mw5,9 earthquake south of
> Iceland this morning. I am unsure why that did happen. I am wondering if
> that is a question of amplitude or of there is something wrong with the
> sensor it self.
>
> There is a spike at 2,2Hz in the data from the sensor at SPS 100, but at
> SPS 1 I get the spike at 0.22Hz.
>
> Regards.
> --=20
> J=F3n Fr=EDmann
>
>
>
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