On 22 May 2021, the Maduo Earthquake occurred on a branch fault of the East Kunlun fault in the Bayan Har Block, which provides opportunity to constrain fault geometry and strain accu-mulation and release for assessment of earthquake hazards. We processed the Sentinal-1A/B SAR imag-es acquired before and after the earthquake, with which we constrained a finite fault model to best fit to the combined data set of downsampled InSAR image and GPS displacements. The inversion indi-cates that the Maduo event ruptured a 160 km long section striking 286.5o and a dipping 81.39o with rake angle of 4.62o. The model suggests three compact rupture areas with the slip amplitude exceeding 4 m on the main rupture section and the largest slip region is in the east of the epicenter with a slip of approximately 4.6 m below the surface, in a good agreement with the field geological survey. The total geodetic moment is 1.67 × 1020 N?m equivalent to Mw7.44, slightly larger than estimate of the USGS.

Lihan Xiao;Rui Zheng;Rong Zou

Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China

地球科学学刊（英文版）

[1]Lihan Xiao;Rui Zheng;Rong Zou-.Coseismic Slip Distribution of the 2021 Mw7.4 Maduo, Qinghai Earthquake Estimated from InSAR and GPS Measurements)[J].地球科学学刊（英文版）,2022(04):885-891

downsampled,39o,62o

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