摘要
鉴于差分干涉技术在地震监测中存在视线向模糊,即垂直、东西、南北三个方向形变在LOS向上的投影,不能反映真实地震形变特征的问题。本文介绍了一种基于2景升轨SAR数据,并利用D-InSAR技术和MAI技术联合解算玉树地震三维形变场的方法。结果表明,在垂直形变中,断裂带西盘沉降,最大沉降量为-69.4cm,断裂带东盘抬升,最大形变量为50.1cm;在南北向形变中,断裂带西北盘整体抬升,最大形变量为70.5cm,东南盘整体下沉,最大沉降量为-88.7cm;在东西向形变中,断裂带东盘呈现向东的位移特征,其最大沉降量为-28.1cm,最大抬升量为44.1cm。解算和模拟的同震形变场表明,断裂带西盘具有朝西走滑(沉降)、东盘朝东走滑(抬升)的形变位移,揭示了玉树地震为左旋走滑型的地震机制。
In view of the differential interference technique in earthquake monitoring,which is the projection of 3 D deformation to the line of sight,can’t reflect the real deformation characteristics of the ground.In this paper,D-InSAR and MAI technology are used to solve the 3 D deformation field of Yushu earthquake based on two SAR images.The results show that,in the vertical direction,the west block of the fault zone subsided,the maximum settlement is-69.4 cm,the east block of the fault zone is uplifted,and the maximum deformation is 50.1 cm.In the north-south direction,the northwest block of the fault zone is raised,the maximum deformation was 70.5 cm,and the whole southeast block subsides,with the maximum settlement amount of-88.7 cm.In the east-west direction,the east block of the fault zone presents the displacement characteristics of east,and its maximum value is-28.1 cm,and the maximum uplift value is 44.1 cm.The coseismic deformation field obtained shows that the fault zone on the west block with west strike-slip,east block with east strike-slip,reveals Yushu earthquake of sinistral strike-slip mechanism.
作者
谢文斌
胡家伟
左小清
张艳梅
刘玉忠
Xie Wenbin;Hu Jiawei;Zuo Xiaoqing;Zhang Yanmei;Liu Yuzhong(Kunming University of Science and Technology,Kunming 650093,China;The Institution of Geological Surveying and Mapping,Hangzhou 310030,China;The Third Institute of Photogrammetry and Remote Sensing,National Administration of Surveying,Mapping and Geoinformation,Chengdu 610100,China;Zhejiang Province Land Survey and Planning Co.,Ltd,Hangzhou 310030,China)
出处
《工程勘察》
2019年第5期45-52,共8页
Geotechnical Investigation & Surveying
基金
测绘新技术系统开发与示范应用(2016KJ0100)
云南省高校工程研究中心建设计划资助
