摘要
基于覆盖震中的Sentinel-1A影像数据,采用D-InSAR技术解算新疆乌什M_(W)7.0地震地表同震形变场;利用四叉树方法对同震形变场进行降采样,以降采样后的数据为约束对断层几何和物理参数进行优化反演。结果表明,升轨和降轨最大隆升值分别为72 cm和39 cm;发震断层位于以逆冲为主兼少量左旋走滑的迈丹-沙依拉姆断裂,断层走向为230°,倾角为67°,滑动角约为45°,断层面上最大滑动量为3.53 m,地震矩为3.78×10^(19)Nm,对应矩震级为M_(W)7.02。库仑应力结果表明,托什干断裂、阔克沙勒断裂、大石峡断裂、库如克玉祖木断裂、库齐断裂北端等区域均处于应力加载区,未来需重点关注。
Based on the Sentinel-1A image data covering the epicenter,we use D-InSAR to calculate the surface coseismic deformation field of Xinjiang Wushi M_(W)7.0 earthquake.We use the quadtree method to downsample the coseismic deformation field,and optimize the geometric and physical parameters of the fault by using the downsampling data as constraint conditions.The results show that the maximum uplift values of ascending and descending orbits are 72 cm and 39 cm,respectively.The seismogenic fault is within the Maidan-Shayilamu fault,which is dominated by thrust and has a small amount of left-lateral strike-slip.The fault strike is 230°,the dip is 67°,and the slip angle is about 45°.The maximum slip on the fault plane is 3.53 m,the seismic moment is 3.78×10^(19) Nm,and the calculated magnitude is M_(W)7.02.The results of Coulomb stress show that the Tuoshigan fault,Kuokeshale fault,Dashixia fault,Kurukeyuzumu fault,and northern Kuqi fault are all in the stress loading region,on which we need to pay more attention in the future.
作者
柳姣姣
张永志
郝小叶
吴文强
LIU Jiaojiao;ZHANG Yongzhi;HAO Xiaoye;WU Wenqiang(School of Geological Engineering and Geomatics,Chang’an University,126 Yanta Road,Xi’an 710054,China;State Key Laboratory of Geo-Information Engineering,1 Mid-Yanta Road,Xi’an 710054,China)
出处
《大地测量与地球动力学》
北大核心
2025年第2期170-176,共7页
Journal of Geodesy and Geodynamics
基金
国家重点研发计划(2019YFC1509201)。
