Abstract We utilize Sentinel-1 data to obtain the coseismic deformation of the 2022 Luding MW6.7 earthquake. Then. we invert the fault geometry parameters and slip model with the InSAR, GNSS, and strong motion data as constraints. The optimal fault strike, dip, and rake angles are 164.3°, 73.7°, and -3.2°. The fault ruptures to the surface, and fault motion is dominated by the left-lateral strike-slip and with a slight dip-slip. The fault slip is concentrated on the depths of 0-18 km, and the peak slip reaches 1.67 m at a depth of 7 km. We further estimate the fault kinematic parameter based on the screw dislocation model by the interseismic GNSS velocities. The fault locking depth is 17.8 km and the long-term slip rate is 10.8 mm/a. The estimated seismic moment accumulation of the Moxi segment is 9.52×1019 Nm since 1786. However, the 2022 Luding earthquake only released 12.3% of the seismic moment accumulation, indicating that the Moxi fault has a high earthquake potential. The Coulomb failure stress in the northern of the Anninghe faut is positive, which suggests the high seismic risk of the Anninghe fault.
XU Lang,CHEN Qiang,WU Yuankun et al. Coseismic Slip Model of the 2022 Luding MW6.7 Earthquake and Seismic Risk Assessment[J]. jgg, 2024, 44(5): 473-478.
XU Lang,CHEN Qiang,WU Yuankun et al. Coseismic Slip Model of the 2022 Luding MW6.7 Earthquake and Seismic Risk Assessment[J]. jgg, 2024, 44(5): 473-478.