InSAR技术用于甘孜-玉树与鲜水河断裂带三维运动研究  

Research on Three-Dimensional Motion along Ganzi-Yushu and Xianshuihe Faults by InSAR Technology

作　　者：陈立权 赵超英[1,2] 高源 CHEN Liquan;ZHAO Chaoying;GAO Yuan(School of Geological Engineering and Geomatics,Chang’an University,126 Yanta Road,Xi’an 710054,China;Key Laboratory of Western China’s Mineral Resources and Geological Engineering,Ministry of Education,126 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710054 [2]西部矿产资源与地质工程教育部重点实验室,西安710054

出　　处：《大地测量与地球动力学》2024年第10期1022-1027,共6页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2022YFC3004302);中央高校基本科研业务费专项资金——长安大学优秀博士学位论文培育资助项目(300203211262)。

摘　　要：以我国四川西部甘孜-玉树与鲜水河断裂带为研究对象,基于欧洲COMET机构提供的LiCSAR产品,包括合成孔径雷达干涉测量技术(InSAR)解缠图和相干图等,采用LiCSBAS软件得到断裂带升降轨视线向形变速率结果,并联合GNSS形变监测结果进行基准改正,分解得到断裂带三维形变场。结果表明,甘孜-玉树与鲜水河断裂带具有左旋走滑特征,最大水平形变速率超过20 mm/a;InSAR结果与GNSS所得水平形变速率均方根误差为1.4 mm/a,水平方向均方根误差为4.8°。基于水平形变场计算得到的剪应变率集中分布在沿鲜水河断裂带附近,最大值超过150×10^(-9)/a。本文研究可为区域孕震机制、地震风险性评估和构造滑坡分布规律研究提供重要参考。We select the Ganzi-Yushu and Xianshuihe faults in western Sichuan as the study area.We use the LiCSBAS method to obtain the ascending and descending line-of-sight deformation rate based on the LiCSAR products provided by the COMET organization.By combining GNSS results,we carry out the reference correction and three-dimensional deformation field decomposition of the faults.The results show that the Ganzi-Yushu and Xianshuihe faults exhibit obvious left-lateral slip characteristics,and the maximum horizontal deformation rate exceeding 20 mm/a.The root mean square error(RMSE) between InSAR and GNSS is 1.4 mm/a,and the RMSE of direction is 4.8°.In addition,we found that the maximum shear rate is mainly concentrated in the vicinity along Xianshuihe fault,with the maximum value more than 150×10^(-9)/a.The result can provide a reference for the study of seismic development,seismic risk assessment and distribution pattern of tectonic landslides in this region.

关 键 词：甘孜-玉树断裂 鲜水河断裂 INSAR 三维形变 最大剪应变率 构造运动 

分 类 号：P237[天文地球—摄影测量与遥感] P313[天文地球—测绘科学与技术]