ANALYSIS ON FOCAL MECHANISM OF SICHUAN XINGWEN Ms4.9 EARTHQUAKE SWARM IN 2023
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.
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