Infrasound Observation at Antarctica

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We deploy an infrasound observation system at Syowa station, Antarctica. The system consists of an infrasound sensor (Chaparral Physics Model-2 : a condenser microphone type differential pressure sensor), a sensor housing, a mechanical low path filter (tube array), and a data logger. We validated the system under extreme condition at Antarctica, especially ; very low temperature and strong blizzard wind at Antarctic winter.From Mar. 2008, we started pilot continuous observation. We monitor differential pressure variation around Syowa station at the infrasound band. Until now, we found out infrasound generated by icequakes, ice sheet movements, oceanic oscillations. Moreover, We found out the new type of infrasound has very long durations (a few to dozens of days) and harmonic overtone structure at some Hz to lower most human audible band.