利用近震和远震波形快速测定地震震源深度——以2013年4月20日四川芦山M_S7.0级地震为例  

Rapid Determination of the Earthquake Focal Depth by Using Near Earthquake and Teleseismic Waveforms:a Case Study of M_S7.0 Earthquake on April 20th, 2013

作　　者：张莹莹[1] 安艳茹[1] 

机构地区：[1]中国地震台网中心,北京100045

出　　处：《华南地震》2016年第3期75-80,共6页South China Journal of Seismology

摘　　要：利用四川台网近震波形资料,精确拾取初至震相,采用网格搜索法,通过调整震源深度来控制近台定位残差,给出芦山7.0级地震的震源深度。同时利用全球台网远震波形资料,给定震源位置利用Taup计算理论走时,通过拟合s P到时,验证近震给出的震源深度。通过和其他研究结果对比,结果表明:利用近震和远震相结合的方法分析给出的芦山地震的震源深度14 km的结果是合理的。在限定的较短时间内,利用近震结合远震判定地震深度的办法简单高效,可以很好的应用于速报工作中。By using the waveforms recorded by Sichuan province regional stations, the first arrival P phases by precisely manual picking, and a grid search method, the paper gets the depth result of Lushan M_S7.0 earthquake through controlling the location residuals by modifying the deep values. Meanwhile, based on the teleseismic waveforms data recorded by global network stations and the given source location, the paper uses Taup to calculate the theoretical arrival time of surface reflections s P, and verifies the focal depth determined by thenear earthquake waveforms by fitting the arrival time of s P. The result shows that the focal depth of Lushan earthquake with 14 km is reasonable which is determined by jointly using the waveforms recorded by regional stations and teleseismic stations. In a limited short time, the method which jointly use the waveforms recorded by regional stations and teleseismic stations is simple and effective, so it will be very suitable to be used in earthquake quick report work.

关 键 词：近震 远震 深度震相 震源深度 

分 类 号：P315.7[天文地球—地震学]