Abstract：We use Sentinel-1 satellite data to obtain the coseismic deformation field of the Xaitongmoin earthquake, and invert the coseismic slip distribution model based on the homogeneous elastic half-space model. The coseismic deformation field derived from InSAR shows that the maximum deformation in the LOS direction of the ascending and descending tracks are 0.049 m and 0.051 m respectively. The long axis of the deformation field is roughly in the NW direction, which is located in the west side of Jaggang-Dinggye fault. The west dip nodal plane is more likely to be the seismogenic nodal plane through the grid search of dip and inclination. The results show that the slip distribution is mainly located within the depth range of 2-10 km, with an average slip of 0.02 m and maximum slip of 0.10 m. The dip angle of seismogenic fault is 47° and the average rake angle is -81.60°, which indicates that the earthquake is mainly normal dip slip. The epicenter of the earthquake constrained by geodetic data is 30.27°N, 87.75°E, with focal depth of 6.58 km and the moment released about 5.056×1017 Nm, corresponding to a magnitude of MW5.7, which is consistent with that from USGS and GCMT. Based on the epicenter location and the slip mechanism of this earthquake, we infer that the branch fault of Jaggang-Dinggye fault is seismogenic.
NI Yipeng,NIE Zhaosheng,XIONG Wei et al. Coseismic Rupture Model of the 2018 Xaitongmoin MW5.8 Earthquake Constrained by Sentinel-1 SAR Data[J]. jgg, 2021, 41(6): 589-594.
