Steinar,
I noticed that you have your seismometer mounted on the plywood floor. The
plywood could be moving as the temperature changes. Is there a way you can
have it mounted closer to the ground. Do you have a basement with concrete
floor. This would be better for temperature stability too.
Gary





-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Steinar Midtskogen
Sent: Tuesday, July 29, 2008 11:43 AM
To: PSN-L@..............
Subject: Relevelling

I've had a SEP seismometer running for a month or so and everything
has been fine.  However, a couple of days ago while we were away on
vacation it began reporting no activity.  When I got back home I found
that the mass had moved all the way to the side, so I had to change
the tilt a little so it would move back to the centre again.

Is this normal behaviour for a Lehmann seismometer?  The mass moved
away from the center at a time the house was empty, so I can't really
think of any external disturbances which could have caused this.

-- 
Steinar Midtskogen
http://voksenlia.net/met/seismometer/
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