PSN-L Email List Message
Subject: Re: Infrasound..
From: Hammonds hammond@...........
Date: Sun, 25 Aug 2002 08:30:33 -0800
Arie, here's some links I've collected on infrasound equipment and use. I
used to work with some of the people described in these
links. I've been thinking of building one.
and of course http://www.belljar.net/microbar.htm
Alaska Public Seismic Network
At 02:55 AM 8/25/2002, you wrote:
>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 :- http://www.tiac.net/users/shansen/beljar/microbar.htm
>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
>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
>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
>windy. Wind and its turbulence is a big problem.
>My web site also has a simple article on locating an earthquake using 3
>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
>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
>the oil chambers and a air return from each chamber to the sensor. I bet
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