Abstract：We employ Sentinel-1A SAR data to extract the coseismic deformation field and 2.5D deformation field of the 2021 Shuanghu, Tibet MW5.7 earthquake for further inversion to obtain the fault slip distribution model. The seismogenic structure is determined by calculating the difference of Coulomb stress changes caused by different nodal solutions for receiving faults, and combining the aftershocks distribution to evaluate the future seismic risk. The results show that the epicenter is 34.37°N, 87.71°E, the focal depth is 6.51 km, and the seismogenic fault tends to the east, strike is 33°, dip is 50°, and average slip angle is -74°. There is a small amount of sinistral strike-slip component; the maximum slip is 0.26 m. In a short period, the seismic risk in the southern part of the earthquake area is relatively small, but the seismic risk in the northern part needs to be further analyzed with more data. The 2021 Shuanghu earthquake is a dispersive deformation on the Huangshuihu normal fault, resulting from the continuous EW-direction extension of the Qiangtang block, and the SN-direction graben in Huangshuihu is further expanded.
