2023年土耳其“双大震”InSAR同震形变观测及断层滑动分布反演  

InSAR Coseismic Deformation Observation and Slip Distribution Inversion of the Türkiye Conjugate Earthquakes in 2023

作　　者：郝小叶 张永志[1,2] 柳姣姣 程雅雯 吴文强 周甜 HAO Xiaoye;ZHANG Yongzhi;LIU Jiaojiao;CHENG Yawen;WU Wenqiang;ZHOU Tian(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)

机构地区：[1]长安大学地质工程与测绘学院,西安市710054 [2]地理信息工程国家重点实验室,西安市710054

出　　处：《大地测量与地球动力学》2024年第5期479-484,509,共7页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2019YFC1509201)。

摘　　要：为研究2023-02-06东安纳托利亚断裂系中“双大震”地震序列的同震形变及发震断层滑动特征,对欧空局发布的Sentinel-1 A影像进行D-InSAR和POT处理,获取此次地震序列的同震形变场,并基于“四叉树”法进行数据降采样,以构建的分布式滑动模型为基础进行发震断层的几何形态及精细化滑动分布反演研究。结果表明,“双大震”同震形变场的形变态势呈现相反的变化趋势,发震断层均位于以左旋走滑为主的东安纳托利亚断裂系中,M W7.8地震破裂在主断裂带上,最大滑动量约10.5 m,平均滑动角为3.74°;M W7.5地震破裂以索尔古分支断层为主,最大滑动量约11.8 m,平均滑动角为1.05°。与USGS和GCMT的震源机制解联合分析可知,两次大震均表现为左旋走滑为主兼少量倾滑分量,此次地震序列的发生是东安纳托利亚断裂带现今构造运动的一大重要体现。In order to study the coseismic deformation and seismogenic fault slip characteristics of the conjugate earthquakes sequence that occurred in the east Anatolian fault system on February 6,2023,we use D-InSAR and POT techniques to obtain the coseismic deformation field of the earthquake sequence with the Sentinel-1A data released by ESA.Based on the distributed slip model,we study the geometric form and refined slip distribution inversion of seismogenic faults after data quadtree down-sampling.The results show that the deformation trend of coseismic deformation field of the conjugate earthquakes presents an opposite change trend,and the seismogenic faults are located in the east Anatolian fault system dominated by left-lateral strike-slip.The rupture fault of M W7.8 earthquake is on the main fault zone,with a maximum slip momentum of about 10.5 m and an average slip angle of 3.74°.The rupture fault of M W7.5 earthquake is mainly on the Sügür fault,with a maximum slip momentum of about 11.8 m and an average slip angle of 1.05°.The joint analysis on focal mechanism solution given by USGS and GCMT shows that the two major earthquakes are mainly left-lateral strike-slip earthquakes with a small dip-slip component,and the occurrence of this earthquake sequence is an important manifestation of the present tectonic movement of east Anatolian fault zone.

关 键 词：2023年土耳其地震 合成孔径雷达差分干涉测量 像素偏移追踪 地表同震形变 断层滑动分布 

分 类 号：P313[天文地球—固体地球物理学] P315[天文地球—地球物理学]