摘要
依据川滇地区1991,1999和2001年GPS测量数据,利用DDA正分析基本原理,结合现有的地质资料,对该地区近年来的水平构造运动特征进行了模拟分析,认为川滇地区水平运动整体速率在1999～2001年期间明显减弱;川滇决体主压应变以顺时针旋转为主,方向为SESEE;其南部是运动变形相对剧烈、易于积累能量的区域;未来一两年内,该地区地震活动水平不会太高。
On the basis of the GPS observation records in 1991, 1999 and 2001 in the Sichuan-Yunnan area and present related geological data, we simulated and analyzed the horizontal tectonic motion and deformation features of this area according to the principle of discontinuous deformation positive analysis. The result shows: the whole horizontal velocity field decreased obviously in 1999-2001 in the area; the Sichuan-Yunnan block rotates clockwise, and the SE-SSE is the main direction of main compression strain; the motion and deformation are comparatively strong in the south part of the Sichuan-Yunnan lozenge block, which is of advantage to accumulate energy; infuture one or two years, the seismic activity level in the area will not be high.
出处
《地震研究》
CSCD
北大核心
2005年第3期262-267,共6页
Journal of Seismological Research
基金
地震科学联合基金项目(603002)
中国地震局"十五"重点项目子课题"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"联合资助.
关键词
DDA正分析
GPS观测速率
水平运动变形
差异运动
川滇地区
discontinuous deformation positive analysis, GPS observation velocity, horizontal motion and deformation, difference motion, Sichuan-Yunnan area
