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Subject: Infrasound..Web page upgrade..Seismograph Chat.. Locating a earthquake
From: Arie Verveer ajbv@............
Date: Sun, 25 Aug 2002 10:55:10 +0000

Hi, For the late month or so I've been testing a "Infrasound" detector
built using inspiration from these two articles:
     The Geophysical Journal of the Royal Astronomical Society, Vol. 26 
     Belljar :- 

Though the reference to the "Belljar" HTML link has now been closed down.
Anyone know where its gone?? I would like to write to the author.
Anyhow, I'm automatically posting the filtered data to my web site at:

At present the data is filtered from 0.5 to 10 hertz, but this is experimental
and can be easily changed. (Looking for fireball re-entries).  What I would like
to do is detect and quake and its associated Rayleigh waves, a tall order. 
But I can wait a few years. Well I hope I can wait a few years. Any suggestions
on the best frequency bands to detect micro pressure waves associated from
quakes? If you find the trace full of noise then you can be guaranteed that its
windy. Wind and its turbulence is a big problem.

My web site also has a simple article on locating an earthquake using 3 methods
that might be of interest. Plus some software upgrades.

Here is a thought. The differential pressure sensors used in the Infrasound
experiment would make an interesting detector for a tilt meter. A sealed system,
with two chambers half filled with a viscous oil and the differential pressure
sensor monitoring the pressure changes in the air above the oil. Thus a tube between
the oil chambers and a air return from each chamber to the sensor. I bet it would



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