PSN-L Email List Message

Subject: Detecting small earthquakes, update
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Sat, 18 Mar 2006 00:54:00 +0000

Hi all

I have now been able to detect earthquakes down to 1.2ML at ~94 Km. I
did also record a 1.6ML earthquake at 82Km the other day. Yesterday i
did record a 2.47ML (clear) earthquake at 150Km, i did also record two
other earthquakes yesterday that where 1.5ML and 1.6ML at ~150Km range
but the signal that i got was poor. 
I did submitt those recordings to the psn list, becose the automatic
system that Icelandic Met Office has did register both of those
earthquakes as 2.1ML in size. I don't submit earthquakes smaller then
2.0ML in size to the psn event file list, becose it is really hard to
see if there actually is a earthquake in the signal when earthquakes are
that small, also the fact that i am about ~80Km away from the closest
active seismitic zone here in Iceland, both South of my location, West
of my location and North-East of my location.

I am unsure of this, but i don't think WinSDR is desinged to detect this
small earthquakes. I have to manual register those earthquakes. But it
might also be that i have the noise setting so high that it doesn't
detect that small earthquakes automatic.

Jón Frímann Jónsson


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