结合波形互相关的双差定位方法在广西北流--广东化州5.2级地震序列中的应用  

Application of Double-difference Relocation Method Using Waveform Cross-correlation on Beiliu-Huazhou MS 5.2 Earthquake Sequence

作　　者：马晓静[1,2,3] 康英 杨选[1,2,3] MA Xiaojing;KANG Ying;YANG Xuan(Guangdong Earthquake Agency,Guangzhou 510070,China;Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology,CEA,Guangzhou 510070,China;Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Project,Guangzhou 510070,China)

机构地区：[1]广东省地震局,广州510070 [2]中国地震局地震监测与减灾技术重点实验室,广州510070 [3]广东省地震预警与重大工程安全诊断重点实验室,广州510070

出　　处：《华南地震》2020年第2期32-36,共5页South China Journal of Seismology

基　　金：地震科技星火计划(XH19032Y)。

摘　　要：基于广东地震台网记录的地震观测报告和连续波形数据,应用双差地震定位算法,对2019年10月12日广西北流-广东化州MS 5.2地震序列进行重新精确定位。重新定位后结合震源分布和震源机制解发现:发震断层沿NWW方向展布,跨度约3.5 km,破裂深度4~10 km。震后25 h内的余震基本沿断层方向分布,有部分沿破裂面向深处发展。之后的余震有向地表、向北东向发展的趋势,根据震源深度剖面分布判断断层的倾角约75°。与震源机制解的断层形态基本一致。Based on the catalog data and continuous waveform data recorded by Guangdong Digital Seismic Network,the Beiliu-Huazhou MS 5.2 earthquake sequence from 12th Oct,2019 were relocated with double difference algorithm.According to the hypocenter distribution and focal mechanism,the fault distributes along the NWW direction,and spans about 3.5 km wide with a rupture depth range of 4~10 km.Aftershocks within 25 hours after the main shock distributed basically along the fault strike and mostly developed toward the deeper part.Aftershocks later developed toward the surface and northeast,and the dip of the fault was about 75 degree according to the profile,consistent with the focal mechanism solution.

关 键 词：双差定位 波形互相关 余震分布 广西北流地震 

分 类 号：P315.7[天文地球—地震学]