PSN-L Email List Message

Subject: Re: Fw: Long Period Pendulum
From: ian ian@...........
Date: Mon, 25 Feb 2008 07:49:11 +0000

I was playing with something like this but with the pivot near the top 
end of the rod.  The top weight was much bigger than the lower weight in 
proportion to the lengths of the sections above and below the pivot.  
That way, you'll get more movement at the bottom end of the long section 
than you are currently getting with your symmetrical arrangement.  
Balancing is a little more tricky because of the asymmetry.

Given that this is probably working as a tilt meter, getting a long 
period may not be too important.


Brett Nordgren wrote:
> Geoff,
> I believe that the only problem is that the amplitude of tilt 
> oscillations from quakes would be rather small, and they are only 
> associated with some of the phases.  But it should definitely be worth 
> a try.
> Regards,
> Brett
> At 01:21 PM 2/24/2008 -0700, you wrote:
>> WHAT WOULD be wrong with building a
>> device that is fixed in a level
>> fashion and measure only tilt since
>> distortions stress and strain in the earth
>> will manifest itself as a tilt ?
>> It may be easier and cheaper to do this ?
>> regards;
>> geoff
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