Infrasound Observation at Antarctica

我们在南极洲的西奥瓦站部署了次声观测系统。该系统由次声传感器(第二章物理模型：电容式麦克风差压传感器)、传感器外壳、机械低通路滤波器(管阵列)和数据记录器组成。我们在南极的极端条件下进行了验证，特别是在南极冬季的极低温度和强风雪条件下。从2008年3月开始，我们开始了试点连续观测。我们在次声频段监测Syowa站周围的压差变化。到目前为止，我们发现了由冰川、冰盖运动、海洋振荡产生的次声。此外，我们还发现这种新型的次声具有很长的持续时间(几天到几十天)和一些赫兹的谐波泛音结构，从而降低了大多数人的可听频带。

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.