青藏块体东北缘弹性块体边界负位错反演与强震地点预测  

INVERSION FOR NEGATIVE DISLOCATION ON ELASTIC BLO-CK BOUNDARIES ALONG THE NORTHEAST MARGIN OF QINGHAI-XIZANG BLOCK AND PREDICTION FOR STRONG EARTHQUAKE LOCATION

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

机构地区：[1]中国地震局第二监测中心,中国西安710054 [2]中国地震局地震预测研究所,中国北京100036 [3]中国地震局地震研究所,中国武汉430071

出　　处：《地震学报》2005年第6期620-629,共10页Acta Seismologica Sinica

基　　金：地震科学联合基金(603001)和中国地震局"十五"项目子课题(100501-04)资助.

摘　　要：利用青藏块体东北缘1993—1999年、1999—2001年和2001—2003年3个时段的GPS 水平运动速度场成果,通过研究建立的弹性块体边界负位错模型反演,给出该区构造块体及 其边界断裂运动与变形差异、构造应变场时空分布、高应变能积累部位以及强度的定性分析 和定量描述．在充分考虑区域构造及块体应变的前提下,研究与该区6级左右及6级以上地 震地点预测相关的背景性前兆的共性特征．On the basis of the velocity field results of horizontal crustal movement obtained from GPS measurements during the periods of 1993-1999, 1999-2001 and 2001-2003 in the northeast margin of Qinghai-Xizang block, and by the inversion of negative dislocation model for the elastic block boundaries, we provide in this paper a qualitative analysis and quantitative description for the difference of motion and deformation between the tectonic blocks and their boundary faults, time-space distribution of tectonic strain field, and locations with highly accumulated strain energy and correlative intensity. Furthermore, taking the regional tectonics and block strain into full consideration, we investigate the common features of background precursors relating to location prediction for M≥6 earthquakes.

关 键 词：弹性块体边界 负位错模型 地壳水平运动 反演 震例研究 

分 类 号：P315.725[天文地球—地震学]