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Characteristics of InSAR Coseismic Deformation and Slip Distribution of the Akto MS6.7 Earthquake,Xinjiang
QIU Jiangtao, ZHAO Qiang, LIN Peng
The Second Monitoring and Application Center, CEA, Xi'an 710054, China
摘要:
The Akto MS6.7 earthquake occurred near the western end of the Muji fault basin in the top of the Pamir syntaxis. The main shock of this earthquake is complicated and the focal mechanism solutions based on the seismic wave inversions are different. Based on the Sentinel-1 SAR data, the coseismal deformation field of the earthquake is obtained by InSAR technique. Based on the elastic half-space dislocation model, the geometrical parameters and the slip distribution model are determined by nonlinear and linear inversion algorithms. The results show that the distributed slip model can well explain the coseismic deformation field. The earthquake includes at least two rupture events, which are located at 7km (74.11°E, 39.25°N) and 33km (74.49°E, 39.16°N) east from the epicenter according to the CENC. The deformation field caused by the earthquake shows a symmetry distribution, with the maximum LOS deformation of 20cm. The main seismic slip is concentrated in the 0-20km depth, and the maximum slip is 0.84m. The seismic fault is the Muji fault, and this earthquake indicates that the northeastward push of the Indian plate is enhanced.
关键词:  The Akto earthquake  InSAR  Coseismic slip distribution  Muji fault  Focal mechanism
DOI:10.19743/j.cnki.0891-4176.201903010
分类号:
基金项目:This project is sponsored by the National Natural Science Foundation of China(41874017) and Seismological Spark Program (XH17059).
Characteristics of InSAR Coseismic Deformation and Slip Distribution of the Akto MS6.7 Earthquake,Xinjiang
QIU Jiangtao, ZHAO Qiang, LIN Peng
The Second Monitoring and Application Center, CEA, Xi'an 710054, China
Abstract:
The Akto MS6.7 earthquake occurred near the western end of the Muji fault basin in the top of the Pamir syntaxis. The main shock of this earthquake is complicated and the focal mechanism solutions based on the seismic wave inversions are different. Based on the Sentinel-1 SAR data, the coseismal deformation field of the earthquake is obtained by InSAR technique. Based on the elastic half-space dislocation model, the geometrical parameters and the slip distribution model are determined by nonlinear and linear inversion algorithms. The results show that the distributed slip model can well explain the coseismic deformation field. The earthquake includes at least two rupture events, which are located at 7km (74.11°E, 39.25°N) and 33km (74.49°E, 39.16°N) east from the epicenter according to the CENC. The deformation field caused by the earthquake shows a symmetry distribution, with the maximum LOS deformation of 20cm. The main seismic slip is concentrated in the 0-20km depth, and the maximum slip is 0.84m. The seismic fault is the Muji fault, and this earthquake indicates that the northeastward push of the Indian plate is enhanced.
Key words:  The Akto earthquake  InSAR  Coseismic slip distribution  Muji fault  Focal mechanism