PSN-L Email List Message

Subject: Re: strain and tilt units
From: John Hernlund hernlund@.......
Date: Mon, 18 Sep 2000 16:39:36 -0700 (MST)

On Mon, 18 Sep 2000 sean@........... wrote:
> I have submitted an abstract to the AGU meeting regarding the new dynamic 
> broadband tiltmeter that senses pure tilt but is not sensitive to horizontal
> acceleration as a seismometer is, so it can be used to record and
> remove tilt noise from broadband horizontal seismic data. The current
> resolution is 8.3 picoradians (10^-12). It readily records such earth tilt
> noises as acoustic gravity waves (from storms) at 50 nanoradians (10^-9)
> amplitude. (I will post the abstract on m web site later in the week.)
> Regards,
> Sean-Thomas

   This sounds extremely interesting.  Is this another affordable instrument
like your vertical seis?

John Hernlund
Department of Earth and Space Sciences
University of California, Los Angeles
E-mail: hernlund@....... or hernlund@............


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Larry Cochrane <cochrane@..............>