PSN-L Email List Message

Subject: Fault zones in Iceland
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Thu, 26 Jan 2006 05:54:24 +0000

Hi all

Here is a map that shows the fault zones and the hotspot of Iceland, if
my loaction is marked on that map it is clear that i hopefully will be
able to detect earthquakes that are <2.5 on the ricther scale. I am
close to most of the fault zones here in Iceland, but not too close.

I am also near (less then 20 km) a old rupture zone that was active at
least 3,3 million years ago. But i do now know if earthquakes happens
there at all or some other type of activti (it looks pretty dead). I
have seen earthquakes that are less then 40 km away from where i life
(south of me, but in both cases the trigger was activiti near
Hveravöllum with earthquakes from 1 - 3.5 mag), but they where small,
around 1,5 - 2,8 on the ricther scale (minimal that Icelandic met Office
detects at that range, based on the location of there stations). There
have been large earthquakes near where i life, the last one was in 1973
and was 5,5 on the ricther scale (South-West of me). The largest one
mesured was a mag 7 on the ricther scale in 1963 and was about 60 - 80
km where i life (North-East of where i life). I fear that when there is
going to me a earthquake above 6 on the ricther scale that my geophone
will move in the tremor (like get displaced from it's location). However
a earthquake at that size and that close to me is unlikley, but not
impossible. But both of those earthquakes did happen before i was born
and i did miss the big earthquakes (two 6,5 mag) in the year 2000 that
did happen in south of Iceland. 

I also have one question to ask this time. Does anyone know how the ocen
wave appears on seismograph ? Becose i was doing some work on my
geophone early this night and after that i see wave top appear on my
seismographs (preventing the geophone from moving by increase the
pressure on him with plastic bags inside of the box that is on top of
him, also to minimize the wind noise as i can), those tops are "smooth"
and don't look like wind noise. I doubt that this is the plastic bags

There appars to be increased activiti at Hveravöllum. Two earthquakes
recored by the Iceland met Office in past 24 hours or so.


Jón Frímann Jónsson


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