一种适用于地震监测的地声传感探头

为了研究地声信号能否作为一种可靠的地震前兆信号,设计一种基于压电薄膜的地声传感探头,用于地震监测。该探头支持0.1 Hz～7 kHz宽频段地声信号采集,电压分辨率为19.073μV,幅值一致性误差小于5.5%(0.47 dB)。该探头通过盐雾试验、随机振动及包装跌落等6项可靠性测试,并应用到包括川滇国家试验场的178个台站的地声监测中。现场观测表明,震中周边的台站能够捕捉到地震前后的地声信号。

A Geo-Acoustic Sensing Probe for Seismic Monitoring

In order to study whether the geo-acoustic signal can be used as a reliable earthquake precursor signal, a geo-acoustic sensing probe based on piezoelectric film is designed for seismic monitoring. The probe supports 0.1 Hz–7 kHz wide-band geo-acoustic signal acquisition, 19.073 μV voltage resolution, and amplitude consistency error less than 5.5% (0.47 dB). The probe passed 6 reliability tests including salt spray test, random vibration and package dropping, and applied to 178 stations including the Sichuan and Yunnan National Test Site for geoacoustic monitoring. Field observation experiments show that the stations around the epicenter can captured the underground geo-acoustic signals before and after the earthquake.