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Volume 33 Issue 4
Aug 2022
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Lihan Xiao, Rui Zheng, Rong Zou. Coseismic Slip Distribution of the 2021 Mw7.4 Maduo, Qinghai Earthquake Estimated from InSAR and GPS Measurements. Journal of Earth Science, 2022, 33(4): 885-891. doi: 10.1007/s12583-022-1637-x
Citation: Lihan Xiao, Rui Zheng, Rong Zou. Coseismic Slip Distribution of the 2021 Mw7.4 Maduo, Qinghai Earthquake Estimated from InSAR and GPS Measurements. Journal of Earth Science, 2022, 33(4): 885-891. doi: 10.1007/s12583-022-1637-x

Coseismic Slip Distribution of the 2021 Mw7.4 Maduo, Qinghai Earthquake Estimated from InSAR and GPS Measurements

doi: 10.1007/s12583-022-1637-x
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  • Corresponding author: Rong Zou, zourong@cug.edu.cn
  • Received Date: 20 Jul 2021
  • Accepted Date: 17 Feb 2022
  • Available Online: 06 Aug 2022
  • Issue Publish Date: 30 Aug 2022
  • 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 accumulation and release for assessment of earthquake hazards. We processed the Sentinal-1A/B SAR images 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 indicates that the Maduo event ruptured a 160 km long section striking 286.5° and a dipping 81.39° with rake angle of 4.62°. 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.

     

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