基于GPS的关中地区现今地壳水平运动特征分析  

A research on present horizontal crustal movement in Guanzhong area based on GPS

作　　者：严学文[1] 刘继红[1] 董军[1] 

机构地区：[1]西安邮电学院电子与信息工程系,西安710061

出　　处：《测绘科学》2008年第4期135-137,共3页Science of Surveying and Mapping

基　　金：西安邮电学院中青年科研基金101-0429

摘　　要：本文在广泛总结前人研究成果、经验并结合关中地区地质构造背景和地震特征的基础上，利用关中地区的GPS观测数据对关中地区地壳水平运动形变进行了深入研究，结果表明：①相对于榆林站点（D058），2002—2004年关中地区和鄂尔多斯块体南缘水平运动速率呈现较为明显的北东向条状带运动特征，仍然呈现整体不连续性逆时针旋转运动的特征；2004年-2005年关中地区和鄂尔多斯块体南缘GPS站点呈现分块式运动特征，不存在较明显的整体不连续性变化特征；②相对于彬县站点（JB08），关中地区中部的彬县-西安-蓝田-线存在-左旋剪切带，该左旋剪切带的北部与铜川-泾阳-临潼-渭南这一北西向小震条带有着较好的对应关系，可能是决定关中地区中部地震活动的主要因素；关中地区从整体上看，东部站点运动成规律性变化，运动速率大，约为6～7mm／a；中西部站点运动规律性不强，运动速率稍小。On the basis of summarizing the former＇ research results and research experience extensively, and combining Guanzhong area geological conformation background and earthquake characteristics, the horizontal crustal movement of the region using of the GPS data is analysized, its characteristics are listed：①Relate to Yulin spot （D058）, form 2002 to 2004, the movement in Guanzhong area and neighborhood appears obviously north - east direction change with banding, and also seems to take anti-clockwise rotation uncontinuitily; form 2004 to 2005, the movement in Guanzhong area and neighborhood appears dispart-block characteristic, and not seems to take integer rotation uncontinuitily ; ②Two sides of the Binxian-Xi＇ an-Lantian ray, exist a revolving shear belt with left （east side）, and the revolving shear belt with left is just located near the earthquake zone of Tongchuan-Jingyang-Lintong-Weinan. Perhaps the shear belt with left mainly control the earthquake activity in middle area of Guanzhong area. In the whole, movement of east spots is disciplinary and movement rate is large, is about 6 -7 ram/a; movement of middle and west spots is not disciplinary, and movement rate is small.

关 键 词：GPS 关中地区 地壳水平运动 

分 类 号：P228[天文地球—大地测量学与测量工程]