PSN-L Email List Message

Subject: Relevelling
From: Steinar Midtskogen steinar@.............
Date: Tue, 29 Jul 2008 20:42:56 +0200

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

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