PSN-L Email List Message

Subject: Re: tiltmeters
From: ian ian@...........
Date: Tue, 06 Feb 2001 13:11:54 -1000


thanks for the reply.  I have a filter arriving this weekend, so, all being
well, I should be able to start seeing very low level tilts instead of just

I was hoping that someone could put a figure on the magnitude of tilt generated
by a quake on the other side of the world.  Perhaps I will have the answer in a
few days from my system!

Can you remember roughly when the email discussion took place about tilt
meters?  I can search the appropriate file of the psn archives.


Ian Smith

George Harris wrote:

> Ian,
> A couple of years ago, I raised the question concerning tilt.  At that time
> I had a vertical pendulum which had a natural frequency of about 1 second.
> I was most surpised when one of the earthquakes in the Aleutians showed up
> very clearly with a 15 second period in California.  I
> believe that it was recording tilt.  I would recommend you trying to
> duplicate.
> George Harris
> ----- Original Message -----
> From: ian 
> To: 
> Sent: Sunday, February 04, 2001 11:26 AM
> Subject: tiltmeters
> > I'm wondering if I have any chance of detecting tele-seismic events with a
> tilt
> > meter.  I think I can resolve a tilt of 5 micro-radians and I can bandpass
> the
> > signal through a 20 second to 10 second period filter.
> >
> > TIA
> >


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