川滇地区地壳水平运动特征与强震关系研究  

RECENT CRUST MOTION FEATURES IN SICHUAN-YUNNAN AND THEIR RELATIONSHIP TO STRONG EARTHQUAKES

作　　者：张希[1] 江在森[2] 王琪[3] 王双绪[1] 张晓亮[1] 

机构地区：[1]中国地震局第二地形变监测中心,西安710054 [2]中国地震局分析预报中心,北京100036 [3]中国地震局地震研究所,武汉430071

出　　处：《大地测量与地球动力学》2003年第3期35-41,共7页Journal of Geodesy and Geodynamics

基　　金：国家重大科学工程"中国地壳运动观测网络"项目 ;中国地震局"十五"重点科研项目子课题"中国大陆构造变形变化特征和重点地区应变积累状态研究" ;地震科学联合青年基金"地壳运动的非震负位错模型反演与强震地点预测研究"

摘　　要：通过对 1991～ 1999、1999～ 2 0 0 1年川滇地区GPS水平运动资料的非震负位错模型反演和形变应变场时空演化分析 ,结合地质构造 ,研究了块体及边界带的构造变形特征及其与强震蕴育的关系。结果表明 :①总体上本区呈现近SE向滑移叠加绕垂直轴顺时针转动的复合运动 ,1999～ 2 0 0 1较 1991～ 1999年运动速率及应变率减弱 ;②强震多发生在形变差异显著的块体边界附近和块体边界断层带的高应变积累闭锁段及其附近 ,以及区域应变率高值区及其边缘 ;③目前差异运动显著的块体边界带、断层闭锁段及区域应变率高值区有丽江 小金河断裂及其与剑川断裂交汇区、金沙江断裂与理塘 德巫断裂交汇区、安定河 则木河断裂、红河断裂中东段及其与小江断裂交汇区、怒江及澜沧 勐遮断裂。Through inversion of aseismic negative dislocation model and analysis of time-space evolution of deformation and strain fields for horizontal velocity data measured by GPS in 1991～1999 and 1999～2001 in Sichuan-Yunnan area,combining with geological tectonic deformation features of blocks and their boundaries and their relationship to development of strong earthquakes are studied.The following results have been oblained.①As a whole,this area appeared nearly SE moving and clockwise rotating and the velocity and strain value in 1999～2001 might be less than that in 1991～1999;②Most strong earthquakes took place on or near block boundary with obvious deformation difference,locked segment of strong strain accumulation along fault zone of block boundary,together with the region of high strain rate;③Present-day boundary zone with obvious motion difference between blocks,locked fault segment and region of high strain lay in the area of Lijiang-Xiaojinhe fault and the region in which it intersect with Jianchuan fault,the meeting region of Jinshajiang fault and Litang-Dewu fault,Anninghe-Zemuhe fault,middle-eastern Honghe fault and the region in which it meets Xiaojiang fault,as well as Nujiang fault and Laicang-Mengzhe fault.

关 键 词：川滇地区 地壳水平运动 非震负位错模型 构造变形特征 强震活动 水平形变 GPS 

分 类 号：P315.725[天文地球—地震学] P228.4[天文地球—固体地球物理学]