利用重复地震探究重庆荣昌地区地壳介质波速变化  

Exploreing Velocity Variation of Crustal Media in Rongchang Area of Chongqing Municipality by Using Repeated Earthquakes

作　　者：汪建 李光科 杨亚运 张巡 WANG Jian;LI Guangke;YANG Yayun;ZHANG Xun(Chongqing Earthquake Agency,Chongqing 401147,China)

机构地区：[1]重庆市地震局,重庆401147

出　　处：《四川地震》2023年第1期32-36,共5页Earthquake Research in Sichuan

基　　金：中国地震局监测、预报、科研三结合项目(3JH-2021040);重庆市地震局科研项目(2022007)联合资助。

摘　　要：选取2010年1月至2022年4月重庆地震台网记录的荣昌地区92次M_(L)≥2.5地震观测资料,采用射线追踪方法,对荣昌地区重复地震震源位置做归一化处理,分别计算4个方位上所选台站记录的地震P波走时差,结果显示:研究区域NE、SE和SW方位台站记录的地震P波走时差负异常持续时间较长(其绝对值较大),表明地壳介质波速有明显升高现象。We selected the data of 92 earthquakes with M_(L)≥2.5 between January 2010 and April 2022 recorded by Chongqing Digital Seismic Network in Rongchang area.We normalized the position of repeated earthquakes in Rongchang area by using the ray tracing method,and calculated the change of P-wave travel-time difference recorded by the selected stations in four directions.The results show that the negative anomaly of P-wave travel-time difference recorded by the stations in NE,SE and SW directions in the study area lasts a long time(with a large absolute maximum value is large),which shows that the wave velocity of crustal medium increases obviously.

关 键 词：重复地震 射线追踪 P波走时差 地壳介质变化 荣昌地区 

分 类 号：P315.07[天文地球—地震学]