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The thinking is that in the days before an earthquake, the great stresses in a fault as it is about to give cause the releases large amounts of radon.
Infrasound and Image Processing Laboratory (under development) -- More than one hundred calibrated infrasound sensitive transducers are being built, and an infrasound calibration test chamber is under construction. In addition, short-period seismometers, digital telemetry hardware, optical infrared thermometers, tiltmeters, and a half dozen Chaparral Physics microphones have been/are being acquired. High resolution video cameras and Macintosh computers with imaging processing and geo-registration/photogrammetry software will also be available.