Abstract:Based on D-InSAR technique, the coseismic deformation fields of the May 21, 2021 MW6.1 earthquake in Yangbi County, Dali Prefecture, Yunnan Province are successfully extracted by collecting Sentinel-1 satellite ascending and descending orbit data and precision orbit data, combined with external DEM data.The results show that the maximum line-of-sight deformation of the ascending is about 6.0 cm while the descending about 7.9 cm. Based on InSAR observations, we obtain the fault geometry parameters and slip distribution of the Yangbi earthquake. We find that the fault of the earthquake has an optimal strike angle of 136.6° and dip angle of 83.1°. The fault rupture is mainly concentrated in the depth of 2 to 12 km underground. The maximum slip is about 0.45 m, located at a depth of about 7 km underground. There is no large area significant slip near the surface of the fault, indicating that the earthquake did not rupture to the surface.
XIONG Lingyan,YANG Yinghui,GU Yanchao et al. Research of the Coseismic Deformation Extraction and Fault Source Model Inversion of Yangbi MW6.1 Earthquake in 2021[J]. jgg, 2022, 42(8): 808-812.