摘要
基于Sentinel-1和ALOS-2近场InSAR形变,利用有限断层方法反演2022-01-08门源MW6.6地震的震源破裂滑动分布。结果显示,门源MW6.6地震的最大滑动量约3.65 m,释放的地震矩约1.56×10^(19)Nm。破裂传播至地表,分东西两段,破裂滑移自震中沿断层向SEE和NWW向延伸,在震中的东南侧断层滑动量较大。有别于其他研究结果,本文认为门源地震震源破裂主要发生在东段的浅部,深度不超过8.0 km,西段的破裂最深可达15.0 km。同震形变整体上符合左旋走滑破裂特征,显示了青藏高原内部块体间的相对运动特征。
Based on the near-field InSAR deformation of Sentinel-1 and ALOS-2,this paper uses the finite fault method to invert the source rupture slip distribution of the January 8,2022,Menyuan M W6.6 earthquake.The results show that the maximum slip of the earthquake is about 3.65 m,and the released seismic moment is about 1.56×10^(19) Nm.The rupture propagates to the surface and is divided into east and west sections,.The rupture slip extends from the epicenter to the SEE and NWW along the fault,and the fault slip is larger on the southeast side of the epicenter.Different from other studies,we propose that ruptures mainly occur in the shallow part of the eastern section,no more than 8 km,and the rupture on the western section can be as deep as 15 km.The coseismic deformation is generally consistent with the characteristics of left-lateral strike-slip rupture,showing the relative motion characteristics of the blocks in the Tibetan plateau.
作者
张旻
董晴
谭凯
ZHANG Min;DONG Qing;TAN Kai(China Railway Siyuan Survey and Design Group Co Ltd,745 Heping Road,Wuhan 430063,China;Geological Environmental Center of Hubei Province,9 Gutianwu Road,Wuhan 430034,China;Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2023年第5期505-508,共4页
Journal of Geodesy and Geodynamics
基金
中铁第四勘察设计院集团有限公司科研课题(2021K073)。