Abstract：Using the InSAR deformation monitoring data, we calculate the coseismic deformation field of the Dingri MW5.7 earthquake in Tibet in 2015, and inverse the geometric parameters and slip distribution of seismogenic faults. Then, we analyze the static Coulomb stress triggering effect of the Nepal MW7.8 main earthquake on Dingri earthquake. Based on the comprehensive analysis of seismic slip mechanism and structural characteristics, we consider that Dingri fault is a buried west-dipping fault. The inversion results show that the rupture is relatively concentrated and mainly distributed in the depth range of 6~9 km with a predominantly normal fault mechanism. The strike and dip of the seismogenic fault of Dingri earthquake are about 178° and 48°, respectively. The length and width of the rupture zones are approximately 5 km and 5 km, respectively, and the maximum slip is about 0.2 m. The released seismic moment is estimated to be about 3.7×1017 N·m, corresponding to a magnitude of MW5.6. The coseismic Coulomb stress of Nepal earthquake is about 0.2 bar at the focal point of the Dingri earthquake; it caused the strain loading of the Xainza-Dinggye rift in southern Tibet.
FANG Jinling,ZHAO Bin,YU Jiansheng et al. Research on the Seismic Source Model and Static Stress Triggering of the 2015 Dingri MW5.7 Earthquake[J]. jgg, 2022, 42(9): 964-970.
