Hi all

Sorry for bringin this old disccuion back up from the darkness of time.
I have found out how far away from a solid rock my geophone is, it is
not deeper then 2m at the most, we are speaking about 2m of sand below
the concret floor then just solid rock. It problay is a lot less then
that below my apartment (i am on ground floor), but it is hard to say
for sure.

Greetings.
-- 
Jón Frímann Jónsson
http://www.jonfr.com

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