2016年唐山开平M_(L)4.7地震活动性分析  

Seismic Activity Analysis of M_(L)4.7 in Kaiping,Tangshan in 2016

作　　者：张盛中 王同利[2] 崔博闻[2] 乔永军[2] 马胜男 Zhang Shengzhong;Wang Tongli;Cui Bowen;Qiao Yongjun;Ma Shengnan(Information Network and Data Center,China University of Geosciences,Beijing 100083,China;Beijing Seismological Bureau,Beijing 100081,China;School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)信息网络与数据中心,北京100083 [2]北京市地震局,北京100081 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《震灾防御技术》2023年第3期568-575,共8页Technology for Earthquake Disaster Prevention

基　　金：北京市自然基金项目(XH21001)。

摘　　要：2016年8月至2016年10月唐山余震区小震活动增强,尤其是8月21日至9月22日期间,其中9月10日发生震级最大地震为唐山开平M_(L)4.7地震。为了解中强地震发震特征及地震序列变化,基于模板匹配定位识别技术,利用2016年8月1日至2016年10月31日连续波形进行唐山开平地震前后微震检测和定位。从研究区域内中国地震台网目录中选择283个地震事件作为模板事件,基于连续波形共检测识别出878个地震事件,其数量约为模板事件的3倍,约为中国地震台网目录的1.4倍,检测后的地震目录完备震级由原来的M_(L)0.2提升至M_(L)-0.1。利用双差定位方法对847个地震事件进行重定位,结果显示震中附近小震活动频繁,且在唐山开平地震震中周边分布较集中。分析震群分布特征认为唐山开平地震属于唐山老震区正常地震活动,发震断层为唐山-古冶断裂的可能性较大。From August to October,2016,small seismic activity increased in Tangshan,especially from August 21 to September 22,The largest earthquake was a magnitude of M_(L)4.7 seismic in Kaiping on September 10.In this paper,based on the continuous seismic data between August 1,2016 and October 31,2016 recorded by 37 seismic stations,we utilize the graphics processing unit based match&locate technology(be called GPU M&L)and double difference location algorithm methods(be called HypoDD)to study the microseismical sequence of the Kaiping M_(L)4.7.Firstly,283 seismic were selected as template from those seismic events provided by the China Earthquake Network Center.Secondly,we detected the 878 seismic events with GPU M&L,which are 3 times more than the template and 1.4 times more than the recorded by the China Earthquake Network Center,the complete magnitude of the seismic catalog decreases from M_(L)0.2 of the network catalog to M_(L)−0.1.Finally,847 seismic events were accurately relocated using HypoDD,showing the activity of small seismic near the epicenter more strongly and the distribution more concentrated.According to the distribution of seismic groups,the Kaiping M_(L)4.7 belongs to the normal seismic activity in the Tangshan and the seismogenic fault is the Tangshan-Guye fault.

关 键 词：地震活动 模板匹配 检测 定位 完备震级 

分 类 号：P315.5[天文地球—地震学]