YANG Jiuyuan,WEN Yangmao,XU Caijun.Seismogenic Fault Structure of the 2023 Ms 6.2 Jishishan (Gansu,China) Earthquake Revealed by InSAR Observations[J].Geomatics and Information Science of Wuhan University,2025,50(2):313-321.
YANG Jiuyuan,WEN Yangmao,XU Caijun.Seismogenic Fault Structure of the 2023 Ms 6.2 Jishishan (Gansu,China) Earthquake Revealed by InSAR Observations[J].Geomatics and Information Science of Wuhan University,2025,50(2):313-321.DOI:10.13203/j.whugis20230501
Seismogenic Fault Structure of the 2023 Ms 6.2 Jishishan (Gansu,China) Earthquake Revealed by InSAR Observations
China. As the largest earthquake to hit this region since seismic record
the 2023 Jishishan earthquake provides an opportunity to improve our understanding of the seismogenic structure and rupture behavior of the regional active fault.
Methods
2
We utilize Sentinel-1A interferometric synthetic aperture radar (InSAR) data to extract the coseismic surface deformation associated with this earthquake and investigate the seismogenic fault structure.
Results and Conclusions
2
Geodetic inversion result shows that both the SW-dipping and NE-dipping fault models can fit the coseismic InSAR observations better. By a joint analysis of the aftershocks
regional fault kinematics and coseismic interferograms
we infer that the 2023 Jishishan earthquake ruptured the NE-dipping seismogenic fault
which may be a buried branch fault belonging to the south Laji Mountain fault. Coseismic Coulomb stress changes indicate a high seismic risk at the middle segment of the eastern branch fault of the north Laji Mountain fault
the southern segment of the eastern branch fault of the south Laji Mountain fault and the western segment of the northern margin of the western Qinling fault.
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references
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