Abstract Based on data collected from local temporary and permanent seismic stations, we study the crustal velocity and focal mechanism for the 18 May, 2019 Songyuan MS5.1 earthquake in Jilin Province and the aftershocks that occurred within half a month. We use the joint inversion of receiver function and surface dispersion, the absolute travel time location and the CAP methods. The results show that the earthquake has a rupture depth of 5.8 km, a centroid depth of 8 km, and a fault plane of 303°/73°/10°. The Second Songhuajiang fault may control the occurrence of the earthquake. The Songyuan MS5.1 earthquake occurred at a depth with high velocity compared to the upper and lower layers. Our results, together with previous studies of about >5.0 earthquakes that occurred in the Songyuan area, suggest that the special velocity structure in focal area and the westward subduction of the Pacific Plate to the Songliao Basin may cause the occurrence of the Songyuan MS5.1 earthquake.
CHEN Chuang,WEI Zigen,LI Wei et al. Analysis of Seismogenic Focal Mechanism and Seismic Parameter of Songyuan MS5.1 Earthquake on May 18, 2019[J]. jgg, 2021, 41(6): 584-588.
CHEN Chuang,WEI Zigen,LI Wei et al. Analysis of Seismogenic Focal Mechanism and Seismic Parameter of Songyuan MS5.1 Earthquake on May 18, 2019[J]. jgg, 2021, 41(6): 584-588.