Ian,

I just realized that it was at least three years ago.  There was a large
quake near the end of the
Aleutian chain at that time.  I may be able to find the record, but we have
moved since then and a lot of things are still buried.  I got a response
from Ed in Colorado.  He may be able to give you more info.

George Harris - gjharris@.............

----- Original Message -----
From: ian 
To: 
Sent: Tuesday, February 06, 2001 3:11 PM
Subject: Re: tiltmeters


>
> Hi,
>
> 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
> noise.
>
> 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.
>
> Thanks
>
> 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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