2023年四川兴文Ms4.9震群震源机制分析
ANALYSIS ON FOCAL MECHANISM OF SICHUAN XINGWEN Ms4.9 EARTHQUAKE SWARM IN 2023
孔令喆 1祁玉萍 1陈梦蝶 1张映1
作者信息
- 1. 四川省地震局,四川 成都 610041
- 折叠
摘要
利用四川省及邻区数字地震台网的宽频带波形资料,基于CAP方法反演得到四川兴文4次Ms4.0以上地震的震源机制解,结合地质构造资料以及区域应力场的条件,初步分析了本次震群活动的发震构造.结果显示:本次震群活动未发生在地表出露的显著断层位置,认为发震构造可能是造成该区域褶皱构造的一系列隐伏断裂带.另外除Ms4.0地震为一次走滑型地震外,其余均属逆冲型地震,震源机制解类型存在差异.
Abstract
Based on the broadband waveform data of the digital seismic network in Sichuan and neighboring areas,the focal mechanism solution of the four earthquakes with Ms4.0 and above were obtained by inversion of the CAP method in Xingwen,Sichuan province.Combined with geological structure data and regional stress field conditions,a preliminary analysis was conducted on the seismogenic structure of this earthquake swarm activity.The results show that the earthquake swarm activity did not occur at the prominent fault position of the surface,and it is suggested that the seismogenic structure may be a series of hidden faults associated with the fold structure in this area.In addition,except for the Ms4.0 earthquake,which is a strike slip earthquake,all other earthquakes belong to the thrust type,and there are differences in the types of focal mechanism solutions.
关键词
四川兴文震群/CAP方法/震源机制解/发震构造Key words
Sichuan Xingwen earthquake swarm/CAP method/Focal Mechanism Solution/Seis-mogenic structures引用本文复制引用
基金项目
震情跟踪定向工作任务项目(2024)(2024010119)
出版年
2024
NETL
NSTL
万方数据