喜马拉雅东构造结地壳形变及断层运动特征  

Crustal Deformation and Fault Movement Characteristics of Eastern Himalaya Syntaxis

作　　者：陈静 杨莹辉[3] 廖诗森 赵凌园 曾陈浩 CHEN Jing;YANG Yinghui;LIAO Shisen;ZHAO Lingyuan;ZENG Chenhao(Huantian Wisdom Technology Co Ltd,Meishan 620564,China;School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]环天智慧科技股份有限公司,四川省眉山市620564 [2]西南石油大学土木工程与测绘学院,成都市610500 [3]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都市610059

出　　处：《大地测量与地球动力学》2024年第11期1105-1111,共7页Journal of Geodesy and Geodynamics

基　　金：四川省科技计划项目(2020YJ0116)。

摘　　要：利用SBAS-InSAR技术提取喜马拉雅东构造结高精度地壳形变速率场,提出一种利用外部GACOS大气数据并基于干涉相位来抑制与地形相关的大气垂直分层延迟相位的方法,发展了一种顾及块体运动的残余轨道趋势相位校正方法。采用弹性回跳理论和负位错模型反演东构造结断层闭锁深度及蠕滑速率。InSAR形变结果表明,东构造结LOS向形变速率为-10~15mm/a。东久-米林断裂西南段两侧存在明显差异性运动,沿断层走向的差异性运动逐渐减弱并趋于稳定;嘉黎断裂跨断层构造活动不强烈。断层运动模型反演结果表明,东久-米林断裂西南段闭锁程度较小,闭锁深度以下的蠕滑速率为7~16mm/a,靠近东构造结顶端,断层闭锁程度逐渐增大,蠕滑速率逐渐减小至2mm/a;嘉黎断裂闭锁深度为4~25km,蠕滑速率为1~4mm/a,整条断裂均处于深度闭锁状态。We use SBAS-InSAR technology to obtain the surface deformation field of eastern Himalaya syntaxis,propose a method that use external GACOS data to eliminate atmospheric effects related to terrain based on interferometric phase,and develop a residual orbital trend phase correction method considering block motion.In addition,we use the elastic rebound theory and negative dislocation model to invert the fault locking depth and creep rate in this area.The InSAR results show that the deformation rate in LOS direction of eastern Himalaya syntaxis is about-10-15 mm/a.There is a significant differential movement on both sides of the southwest section of Dongjiu-Milin fault,which gradually weakens and tends to stabilize along the fault.There is no obvious surface deformation on both sides of Jiali Fault.The inversion results of fault movement model show that the locking degree of the southwest section of Dongjiu-Milin fault is relatively low,with a creep rate of 7-16 mm/a.Near the top of east Himalaya syntaxis,the fault locking degree gradually increases,and the creep rate gradually decreases to 2 mm/a.The locking depth of Jiali fault is 4-25 km,with a creep rate of 1-4 mm/a.The Jiali fault is in a deep locking state.

关 键 词：喜马拉雅东构造结 大气校正 残余轨道校正 SBAS-InSAR 断层运动反演 

分 类 号：P315[天文地球—地震学] P237[天文地球—固体地球物理学]