PSN-L Email List Message
Subject: Re: Earthquake monitoring in Iceland
From: ian ian@...........
Date: Tue, 27 Dec 2005 19:15:56 +0000
I may be your nearest neighbour (East Scotland). I have a 4.5 Hz
Geophone and a Lehman long period. I don't normally pick up anything
less than about 2.5 Mag with my geophone unless it is quite close. The
recent Hemel Hempstead oil storage depot which exploded (and was
equivalent to a 2.4 Magnitude) was not picked up by my geophone. The
oil depot is about 300 miles south of where I am. I did get an
excellant trace of the recent mag 3.0 quake near Fort William, which is
about 75 miles away. See
If possible, you should get the geophone out of the house. Then you can
turn up the gain and hopefully pick up some events. Mine are on a
concrete block away from the house. Unless you have a long period
geophone you will be limited to fairly near by events. A great website
for events is http://www.earthquakes.bgs.ac.uk/helicorder/heli.html ,
though right now the graphs haven't updated since the 24th. No doubt a
fault which will be corrected when the staff return to work. The
Edinburgh station is actually in the basement of the building I work in!
You're welcome to check my system, http://www.iasmith.com/realtime.htm ,
though at the moment I'm trying to track down 2 problems: my Lehman is
oscillating and I have an intermittent electrical fault somewhere which
draws large annoying lines on the graphs occasionally.
Jón Frímann wrote:
>This is my first email message here, so i want to say hi with everybody.
>I did setup my first geophone one week ago. For those how have intrest
>in checking it here is a url
>http://www.jonfr.com/earthquake/earthquake.htm I am still at testing it,
>for possible errors and bugs and so on.
>The sensor is located in my apartment, but in a quiet spot. This week
>has been rater quiet in the terms of number of earthquakes. But you can
>check the Icelandic Meteorological office, earthquake part here >
>http://hraun.vedur.is/ja/englishweb/index.html But there is a alot of
>earthquakes in Iceland that i don't pickup on my one geophone. Mostly
>from 0,0 to 3 on the ricther scale.
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