Abstract We first obtain the coseismic deformation of the Tajikistan MW7.2 earthquake based on the ascending and descending Sentinel-1A SAR images. The coseismic deformation shows that the maximum displacement are 15 cm and 16 cm for ascending and descending tracks, respectively. Then the fault geometry and slip model are inverted based on the elastic dislocation model with the InSAR data as constraints. The best-fitting fault geometry parameters are 131.1° for strike and 85.7° for dip angle. This event is dominated by right-lateral strike-slip motion and has not ruptured to the surface. The slip asperity is concentrated at the depth of 10 to 30 km with a maximum slip of 3.49 m. The seismic moment magnitude is about MW7.16. Finally, we calculate the static Coulomb stress change at different depths and adjacent faults using inversion slip model. The results suggest that the magnitude of Coulomb stress change increases with depth, which is consistent with the existing stress field and geological investigations of Pamir plateau. The aftershock activity begins to occur at a depth of 10 km. Furthermore, the Coulomb stress change induced by this event has little effect on the adjacent faults.
ZI Chengdai,TENG Xingfa,GUAN Shudan et al. Coseismic Deformation Field and Slip Distribution of the 2023 Tajikistan MW7.2 Earthquake Revealed by InSAR Observations[J]. jgg, 2024, 44(3): 234-239.
ZI Chengdai,TENG Xingfa,GUAN Shudan et al. Coseismic Deformation Field and Slip Distribution of the 2023 Tajikistan MW7.2 Earthquake Revealed by InSAR Observations[J]. jgg, 2024, 44(3): 234-239.
