PSN-L Email List Message

Subject: Re: Hekla volcano geophone planned
From: ian ian@...........
Date: Fri, 08 Feb 2008 14:23:47 +0000


today's mid-Atlantic quake saturated my high gain channel (+/-0.1V), so 
a lot of the data comes from the mid-gain channel (+/-1.0V)

The trace is a bit noisy with the strong winds here causing the trees to 
bend and twist.



ChrisAtUpw@....... wrote:
> In a message dated 06/01/2008, ian@........... writes:
>     Looking back I can see that there are a few traces (not many) which
>     flipped between channel gains +/-0.1V and +/-1.0V.  So the feature is
>     giving me more gain to look into the weaker signals without being
>     clobbered with saturation on the stronger traces - both the high
>     and low
>     pass filters apply a 20db gain to compensate for the attenuation
>     of the
>     filters.
> Hi Ian,
>     I would expect that all your out of range signals will be due to 
> the surface waves? 

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