PSN-L Email List Message

Subject: Re: Detecting micro-earthquakes
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Fri, 10 Feb 2006 10:38:13 +0000


To Roger.

I did in the end figure out that i didn't detect the earthquake at that
range. It was out of my range, after all i didn't see any change in the
graph as i did go down to 10 seconds on the X scale. I also now got a
comparison, i did detect a mag 2.2Ml (unconfirmed size) earthquake this
morning (05:01 GMT), it did happen when there is minimal noise from
traffic and other cultrual noise sources. I was able to detect the S
wave of the quake, but the recording is really poor.

As for the 10 to 20Hz noise, i am unsure what you mean.But i am close to
the ocen, about 300 meters from the beach. There are many noise sources
where the geophone is located at the moment (for instant the wind noise
is hig, even if the geophone is located inside the house), at the moment
i can't move the geophone to better location, becose of house i life in.
But i plan to move the geophone in next 6 to 8 months, when i can buy
the needed hardware to move the geophone.

If i rember correctly, the noise level is almost none when i do
disconnect the geophone from the psn board. But i am not sure, i will
check this when i move the geophone. The geophone is also located 2
meters (max) from a solid bedrock. That problay goes down to ~35km into
the crust, becose it is an old volcano that the town is build on top of
(in the side of it).

Jón Frímann Jónsson


Public Seismic Network Mailing List (PSN-L)

[ Top ] [ Back ] [ Home Page ]