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.

http://geology.about.com/library/weekly/aa121497.htm
http://www.polar.org/antsun/oldissues2000-2001/2001_0204/ctbto.html
http://www.nemre.nn.doe.gov/nemre/introduction/infrasound_fact_sheet.html
http://www.nemre.nn.doe.gov/nemre/introduction/infrasound_mon2.html
http://www.pidc.org/rdss/resources/INFRA/doc/2_Stations.htm
http://geology.heroy.smu.edu/~hayward/Projects/Infrasonics/assets/sow.html
http://www.seismo.berkeley.edu/seismo/annual_report/ar99_00/node11.html#SECTION03740000000000000000

and of course http://www.belljar.net/microbar.htm

regards,

Bob Hammond
Alaska Public Seismic Network
http://apsn.awcable.com


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:
>
>http://www.iinet.net.au/~ajbv
>
>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
>work.
>
>
>Cheers
>
>Arie
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