格仁错断裂现今地壳运动特征的InSAR监测与分析  

The Monitoring and Analysis of Current Crustal Movement of Gyaring Co Fault Based on InSAR

作　　者：陈巍然 朱良玉[2] 孙赫 张文婷 王莺[2] CHEN Weiran;ZHU Liangyu;SUN He;ZHANG Wenting;WANG Ying(The 28th Research Institute of China Electronics Technology Group Corporation,1 East-Muxuyuan Street,Nanjing 210007,China;The Second Monitoring and Application Center,CEA,316 Xiying Road,Xi’an 710054,China;361175 Troops of PLA,Nanjing 210049,China)

机构地区：[1]中国电子科技集团公司第二十八研究所,南京市210007 [2]中国地震局第二监测中心,西安市710054 [3]61175部队,南京市210049

出　　处：《大地测量与地球动力学》2021年第5期478-483,共6页Journal of Geodesy and Geodynamics

摘　　要：基于干涉合成孔径雷达(InSAR)技术,获得格仁错断裂高空间分辨率的地壳形变速度场,并以此为约束,利用深浅部震间断层位错模型反演断层面上的滑移速率与闭锁深度。结果表明,格仁错断裂性质为右旋走滑,断层两侧存在差异运动,断层上的差异运动自西向东逐渐减弱;InSAR变形结果与GPS观测结果高度一致,远场LOS向最大形变差异达4 mm/a;研究区域内断层剖面分析结果显示,格仁错断层两侧地壳形变差异最大,是区域内控制长波长信号的主断层;格仁错断层面滑动分布不均匀,滑动速率约为2~6 mm/a,断裂西北段滑动速率小于东南段。闭锁程度较高的区域主要位于当惹雍错与孜桂错之间,该地区存在较高的强震危险性。We obtain the high-spatial resolution crustal deformation velocity based on the interferometric synthetic aperture radar(InSAR).The interseismic creep velocity distribution and locking depth are inversed based on the InSAR deformation,using the deep and shallow seismic dislocation model.The results show that,firstly,Gyaring Co fault is a right-lateral strike-slip,with differential motion on both sides of the fault.From west to east,the differential motion on the fault gradually weakens.Secondly,InSAR deformation features are highly consistent with GPS observations,and the largest difference in far-field deformation is 4 mm/a(LOS).Thirdly,the analysis of the fault profile in the study area shows that the difference in crustal deformation on both sides of the Gyaring Co fault is the largest,which is the main fault that controls the long-wavelength signal in the area.Fourthly,the slip rate of the Gyaring Co fault is 2~6 mm/a,withthe locking area located at the range between Tangra Yum Co and Zigui Co.There is a risk of future earthquakes in this area.

关 键 词：格仁错断裂 INSAR 右旋 滑动分布 

分 类 号：P315[天文地球—地震学]