2018年云南地区GNSS面应变变化及地震关系分析  

Analysis of Relationship between GNSS Surface Strain Change and Earthquake in Yunnan in 2018

作　　者：杨建文 张鹏映 茶文剑 何应文 叶泵[1] 陈佳[1] 王军[1] YANG Jianwen;ZHANG Pengying;CHA Wenjian;HE Yingwen;YE Beng;CHEN Jia;WANG Jun(Office of the Western Yunnan Earthquake Prediction Study Area,CEA,Binhai Road,Dali 671000,China;Dali Haidong Development Municipal Construction Co Ltd,Haidong New District,Dali 671006,China;Yunxian Seismic Station of Yunnan Earthquake Agency,98 Caopi Street,Yunxian,675803,China)

机构地区：[1]中国地震局滇西地震预报实验场办公室,云南省大理市671000 [2]大理海东开发市政建设有限公司,云南省大理市671006 [3]云南省地震局云县地震台,云南省675803

出　　处：《大地测量与地球动力学》2020年第3期258-263,共6页Journal of Geodesy and Geodynamics

基　　金：云南省青年地震科学基金(2018k08);云南省地震局科技专项(2018ZX04);云南省陈颙院士工作站专项(2014IC007)~~

摘　　要：基于2018-01以来云南地区GNSS连续观测资料,利用高精度数据处理软件GAMIT/GLOBK处理后获取位移场并采用克里金插值方法进行网格化插值,获得均匀分布的位移场,再进行应变计算获取面应变信息,动态分析2018年云南地区面应变变化特征,探讨其与通海2次5.0级地震及墨江5.9级地震的内在联系。结果表明,2018-01~11云南地区面应变经历了拉张为主、区域应变快速积累、区域强挤压和强拉张并存(双柏-新平-墨江条带)、区域应变快速调整、震后应变格局改变(双柏-新平-墨江条带消失)的动态过程。通海2次5.0级地震和墨江5.9级地震分别发生在区域应变调整过程中以易门-塔甸为代表的强张拉和以景东-思茅为代表的强挤压高梯度带上,可能是在应变显著积累和应变调整双重因素作用下的产物,不同的是,墨江5.9级地震改变了以双柏-新平-墨江条带为界的强挤压和强拉张并存的区域特征,对云南整体区域面应变格局造成实质性的影响。Based on the continuous observation data of GNSS in Yunnan since January 2018,the displacement field is obtained by high-precision data processing software(GAMIT/GLOBK),and the Kriging interpolation method is used to mesh the interpolation to obtain uniform distribution.We ascertain the displacement field,calculate strain,obtain surface strain information,dynamically analyze the surface strain variation characteristics of Yunnan in 2018,and explore the intrinsic relationship between the two M5.0 earthquakes in Tonghai and Mojiang M5.9 earthquake.The results show that there are significant backgrounds of strain accumulation before the two M5.0 earthquakes in Tonghai and Mojiang M5.9 earthquake,and there is a process of regional strain field adjustment in the short term before the earthquake.The two may be strong tensile and strong compression regional strains under the dual factors,the product of the changing process.The difference is that the Mojiang M5.9 earthquake changed the regional characteristics of strong extrusion and strong tensile joints bounded by the Shuangbai-Xinping-Mojiang strip,which had a substantial impact on the overall regional surface strain pattern in Yunnan.

关 键 词：GNSS连续观测 面应变 通海5.0级地震 墨江5.9级地震 

分 类 号：P315[天文地球—地震学]