重力仪与地震计记录的地震波信号频谱特征比较——以芦山7.0地震为例

A Comparison between the Spectral Characteristics of Seismic Signals Recorded by Gravimeter and Seismometer:Taking Lushan 7.0 Earthquake for Example

以芦山MS7.0地震的地震波记录为例,比较分析我国12个地震台的同址gPhone重力仪与CTS-1地震计记录的地震波信号的频谱特征。观测结果表明,震中距大于2 000km时,两种仪器记录的P波波形基本一致,只在幅度上稍有区别。P波的频谱分析结果表明,震中距较小时gPhone重力仪会遗失一些高频信号,震中距大于2 000km时,两种仪器记录的P波优势频带均为0~0.3Hz。

Taking Lushan earthquake as an example, we compare the spectral characteristics of seismic signals recorded by gravimeter and seismometer in the same seismic stations. The results show that the P-waves recorded by the two instruments are basically the same when the epicenter distance is greater than 2 000 km, but there is a slight difference in magnitude. The results of P-wave spectrum analysis indicate that the gPhone gravimeter cannot record some high frequency information, and the main frequency range of seismic waves recorded by the gPhone gravimeter and CTS-1 seismometers are quite concentrated in the 0--0.3 Hz range when the epicenter distance is greater than 2 000 km.