PSN-L Email List Message
Subject: Re:How much gain
From: Roger Sparks rsparks@..........
Date: Tue, 04 Dec 2007 08:39:53 -0800
In my earlier posting, I forgot to mention noise from the seismometer
Every moving contact point will generate friction and noise. Friction
is noise. Low friction is low noise.
Severe seismometer noise is observed as a "spikey" trace, rather than
the smooth wave form that should be seen as a result of the ocean noise.
Less severe seismometer noise will appear as small spikes on an
undulating ocean wave, but a smooth ocean wave trace can never be
On my vertical seismometer, I have eliminated seismometer friction noise
by using long springs as the hinge. I still have seismometer noise that
could be called "phase" noise that is a result of seismometer damping
and motion characteristics.
Sorry to have omitted this noise source from my previous posting.
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