渭河盆地现今地壳水平运动及应变特征  

RESEARCH ON HORIZONTAL CRUSTAL MOTION AND STRAIN FEATURES OF WEIHE BASIN WITH GPS DATA

作　　者：瞿伟[1,2] 张勤[1,2] 王庆良[3] 凌晴[1,2] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西部矿产资源与地质工程教育部重点实验室,西安710054 [3]中国地震局第二监测中心,西安710054

出　　处：《大地测量与地球动力学》2009年第4期34-37,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金重点项目(40534021);国家自然科学基金(40672173);国家自然科学基金青年科学基金(40802075)

摘　　要：利用2001—2004年GPS观测资料,研究渭河盆地的地壳水平运动特征和应变特征,探讨地壳水平应变特征分布与地震活动的关系。结果表明:1)相对于稳定的鄂尔多斯块体,研究区东、西两侧地壳水平运动存在差异性运动,其中渭河盆地中部的彬县-西安-蓝田一线两侧GPS站点的水平速率明显较大;2)关中地区泾阳-西安-咸阳-临潼一线地区表现出最大剪应变高值区,并且附近等值线密集,应变梯度大,与铜川-泾阳-临潼-渭南一带的小震频发区相互对应。On the basis of the GPS data from 2001 to 2004 ,the horizontal crustal motion features of the Weihe basin were analyzed. The relations between earthquakes and the strain distribution features were also discussed. The following results are obtained ： 1 ） There is difference between the movements, relative to the stable Ordos block, on the eastern and western side of the Weihe basin, among which the horizontal velocities of the GPS sites located at both sides of Bin County-Xi＇ an-Lantian which is in the middle of Weihe Basin are obviously bigger than that in other areas ;2）Jingyang -Xi＇ an-Xianyang-Lintong area of Guanzhong district is the maximum zone of high shear strain and also has intensive isogram of high strain, which corresponds to small earthquakes-prone areas, namely, Tong- chuan-Jingyang-Lintong-Weinan region.

关 键 词：渭河盆地 GPS速度场 地壳运动 应变特征 地震活动 

分 类 号：P315.725[天文地球—地震学]