PSN-L Email List Message

Subject: Re: Noise that my geophone picks up
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Fri, 20 Jan 2006 23:48:17 +0000

Hi Chris

The geophone is above ground, with double box on it, inside is a plastic
box and on top of that is a wood box that has isolation material, i also
have two heavy rocks on the box to prevent it from moving in bad
weather. It is well sealed from the weather (as well it can be done).
Digging a hole 1m deep is not an option for me, becose my lawn is shared
and the there is a bedrock problay about 1m deep down, also the ground
freezing line is about 1m deep.

The noise pickup is diffrent, i see more wind but fewer spikes that
start a warning in winsdr. Only the higest noise inside the block is now
picked up in such way it starts a warning in winsdr (like when someone
closes a door). Unlike before when i did pickup almost everything. It
also seems when the weather is good, and there is no or little traffic
the noise level go down to almost nothing (that seems to be the case at
the moment). The only thing that creates alot of spikes is when the snow
is cleared off the roads near me. But only when it is done close to my
location, less then 500m away from me.

So far the geophone has withstand a heat change from -5C to 3C in the
past 24 hours.

I can send a picture of my setup, if you are intrested in seeing it.

Jón Frímann Jónsson


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