I am building infrasound monitors of the microbarograph type.  Here is
some information on my latest design:

www.infiltec.com/Infrasound@home/

Most of my customers are monitoring wind turbines, but I have some
interest from volcano scientists, tornado trackers, and even bigfoot
researchers and paranormal investigators.

The biggest infrasound noise source is wind, but during calm periods I can
detect microbarom at about 0.2 Hz, similar to microseism.

http://en.wikipedia.org/wiki/Microbarom

Here is a real time 24 hour helicorder display updating every 5 minutes
from my infrasound monitor located on my balcony near Washington, DC

http://www.infiltec.com/Infrasound@..............

It detects mostly helicopters which have a strong tone around 15 Hz.

To reduce wind noise in the infrasound band, you need a spatial wind
averaging system, such as shown here

http://en.wikipedia.org/wiki/File:Infrasound_Arrays.jpg

Dave
Bailey's Crossroads, VA
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