Coseismic slip distribution and 3D deformation field simulation of the Menyuan Mw 6.7 earthquake in Qinghai based on InSAR constraint

• Published in: 地质科技通报 Vol. 43; no. 6; pp. 212 - 225
• Main Authors: Rui ZENG, Yanan JIANG, Aoxiang YAN, Yan Cheng, Huiyuan LUO
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Bulletin of Geological Science and Technology 01.11.2024
• Subjects: 3d coseismic deformation field; fault slip distribution; insar; lanzhou-xinjiang high-speed railway; menyuan mw 6.7 earthquake in qinghai; static coulomb stress change
• ISSN: 2096-8523
• DOI: 10.19509/j.cnki.dzkq.tb20240004

On January 8, 2022, a Mw 6.7 earthquake stuck Menyuan Hui Autonomous County, Qinghai Province, resulting in extensive surface ruptures and the closure of the Lanzhou-Xinjiang high-speed railway. Objective This study aims to investigate the focal mechanism of the Menyuan earthquake. Methods D-InSAR technology was employed to process ascending and descending SAR data from Sentinel-1A, producing a coseismic deformation field. Using InSAR LOS deformation as a constraint, a two-step inversion method was applied to determine the geometric parameters of the earthquake fault and the detailed coseismic slip distribution. Additionally, the coseismic static Coulomb stress changes were calculated, and the seismogenic structure, along with the regional seismic hazard, was further analyzed. Results The findings reveal that the long axis of the InSAR coseismic deformation field is oriented WNW-ESE, indicating left-lateral strike-slip movement. The refined double-fault slip distribution shows that both the Lenlongling and Tu