汶川Ms8.0地震前的区域垂直形变背景  

BACKGROUND OF VERTICAL DEFORMATION BEFORE WENCHUAN Ms8. 0 EARTHQUAKE

作　　者：塔拉[1] 陈阜超[1] 郭良迁[1] 陈聚忠[1] 薄万举[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《大地测量与地球动力学》2013年第4期1-3,21,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局"全国地震区划图编制项目";中国地震局地震科技星火项目(XH12071);天津市应用基础研究(08JCZDJC18900);中国地震局地震行业科研专项(200908028)

摘　　要：根据1951年以来的水准观测资料和1999—2007年的GPS观测资料计算得到的地壳垂直形变速率,研究了青藏块体和华南块体不同时间段的垂直形变特征,以及形变与汶川8.0级地震孕育发生的关系。结果显示,汶川8.0级地震发生在垂直形变强烈上升区的形变速率梯度带上;大震孕育过程的应变能积累与印度板块-欧亚板块相互碰撞有关;与位于两个板块碰撞前缘的青藏块体在南北向强烈挤压,形成垂直方向隆升,物质向东和东南迁移过程相联系。Based on the data obtained since 1951 and the crustal vertical deformation rate calculated from the GPS data obtained from 1999 to 2007, the vertical deformation characteristics in Qinghai-Tibet block and southern China block, and the relationship between the vertical deformation and both of the occurrence and the development of Wenchuan MsS. 0 earthquake was studied. The results show that Wenchuan MsS. 0 earthquake happened in the vertical deformation rate gradient zone that was the dramatic rising area. The accumulation of deformation strain en- ergy was related with collisions of the Indian-Eurasian plates, and the vertical uplift of the Qinghai-Tibet block by strong squeeze in North-South direction at the front edge of the collision of the two plates with the substance move- ment to the East and South-East.

关 键 词：垂直形变 形变场演化 上升区 垂直形变梯度带 应变能积累 

分 类 号：P315.72[天文地球—地震学]