地震仪与钻孔应变仪联合测定近震Pg波速度

Joint Measurement of Local Earthquake Pg Wave Velocity from Seismometer and Borehole Strainmeter

通过对比仁和台地震仪与钻孔应变仪观测曲线,采用滑动分析方法计算多个近震Pg波速度,综合考虑反射波影响和测定效度,最终测得仁和台近震Pg波速度为5.98 km/s,该值与云南2015地壳速度模型的上地壳P波速度很接近。本文工作表明,准确标定后的钻孔应变仪可以作为测震仪器使用,以弥补地震仪在观测低频事件时的不足。

By comparing the observation curves of the seismometer and the borehole strainmeter at Renhe station,the Pg wave velocity of several local earthquakes is calculated by sliding analysis method.Considering the influence of reflection wave and the measurement validity,the Pg wave velocity of Renhe station is finally measured to be 5.98 km/s,which is very close to the P wave velocity of the upper crust of the Yunnan 2015 crustal velocity model.The work in this paper shows that the borehole strainmeter can be used as a seismic instrument after accurate calibration to make up for the deficiency of the seismometer in the observation of low frequency events.