Abstract We use the dual-track D-InSAR technique to obtain the synoptic deformation fields of the May 21, 2021 earthquake in Yangbi county, Yunnan province, on ascending and descending tracks, and use them as constraints to invert the geometric parameters and synoptic sliding distribution of the seismic fault based on the Okada uniform elastic half-space dislocation model. The results show that the maximum deformation in the InSAR deformation field is about 10 cm in the ascending LOS direction and about 13 cm in the descending LOS direction; the Okada model inversion shows that the seismic fault is about 12.53 km long and 6.44 km wide, located at 3-9 km underground, with a strike angel of about 136.34°, a dip angel of about 83.79°, and a slip angle of about -175.46°. The maximum slip displacement is 0.64 m at a depth of 4 km below ground. The earthquake occurred on an unknown NW-SE fault zone, which may be a secondary or branch fault of the Weixi-Qiaohou-Weishan and north Honghe fault zones.
AN Yan,YANG Fan. InSAR Monitoring and Inversion of Fault Slip Distribution for the 2021 Yangbi Earthquake in Yunnan Province[J]. jgg, 2023, 43(5): 509-516.
AN Yan,YANG Fan. InSAR Monitoring and Inversion of Fault Slip Distribution for the 2021 Yangbi Earthquake in Yunnan Province[J]. jgg, 2023, 43(5): 509-516.