利用InSAR资料反演宁洱M_S6.4地震震源参数及库仑应力变化  

Earthquake Source Parameter of the Ning’er M_S6.4 Earthquake Inferred from InSAR Data and Analysis of Coulomb Stress Disturbance

作　　者：陈晨月 冯光财[1] 高华[3] 杨怀宁[4] CHEN Chenyue;FENG Guangcai;GAO Hua;YANG Huaining(School of Geoscience and Info-Physics Engineering,Central South University,932 South\|Lushan Road,Changsha 410083,China;Guangzhou Urban Planning&Design Survey Research Institute,10 Jianshe Road,Guangzhou 510000,China;Faculty of Geomatics,East China University of Technology,418 Guanglan Road,Nanchang 330013,China;National Earthquake Response Support Service,1 West-Yuquan Street,Beijing 100049,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙市麓山南路932号410083 [2]广州市城市规划勘测设计研究院,广州市建设大马路10号510000 [3]东华理工大学测绘工程学院,南昌市广兰大道418号330013 [4]中国地震应急搜救中心,北京市玉泉西街1号100049

出　　处：《大地测量与地球动力学》2019年第3期295-301,共7页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41574005);中南大学升华育英计划;高分辨率对地观测系统重大专项(民用部分)(03-Y20A11-9001-15/16);中央高校基本科研业务费专项基金(2017zzts773)~~

摘　　要：首先利用ALOS PALSAR数据,通过D-InSAR技术获取2007-06-03云南宁洱M_S6.4地震的同震形变场,然后基于Okada弹性半空间位错模型反演该地震的断层几何以及精细滑动分布,最后计算宁洱地震后周边断层的静态库仑应力变化。结果表明,形变主要集中在西盘,最大视线向形变量为51.6 cm;反演得到的震源位置为23.05°N、101.02°E,深度3 km,断层走向145°,倾向49.5°,平均滑动角153°,发震断层为NNW向普洱断裂,断层活动以右旋走滑为主,兼具逆冲分量;断层面最大滑动量为1.2 m,反演得到的震级为M_W6.19。基于库仑应力场发现,磨黑断裂处于库仑应力增加区域,而2014年景谷地震位于负值区域。结合实地考察资料和反演结果表明,宁洱地震为浅源地震,但断层并未出露地表。A M S6.4 earthquake struck Ning’er county of Pu’er city in Yunnan,China on June 3,2007.In this paper,we extract the coseismic deformation field by two-pass differential interferometric SAR(D-InSAR)technology from ALOS PALSAR data.Based on the Okada half-space elastic model,the fault geometry of such earthquake and the corresponding fault slip distribution parameters are then calculated,as well as the changes of Coulomb stress around the fault after the earthquake.The results show that the maximum deformation occurred in the west wall of the fault,with a 51.6 cm deformation in the line-of-sight direction.And the epicenter of the inversion is located in 23.05°N,101.02°E,of which the focal depth is 3 km,the strike is 145°,the dip is 49.5°and the rake is 153°.We infer that the NNW direction of Pu’er fault is a causative fault,where the main motion characteristics are right-lateral strike-slip,with thrusting component,of which the maximum value of slippage is 1.2 m,and the inversion magnitude is M W6.19.According to the Coulomb stress field,we find that the Mohei fault is located in the area of increasing Coulomb stress,while Jinggu earthquake is located in the area of negative Coulomb stress.In addition,considering both the field investigation data and experimental results,as a shallow earthquake,there is no rupture zone on the surface of Ning’er earthquake.

关 键 词：宁洱地震 震源参数 INSAR 库仑应力 

分 类 号：P315[天文地球—地震学]