广西区域现今地壳运动构造特性研究  

Present-day Tectonic Characteristics of Crustal Movement in Guangxi Area

作　　者：廖超明[1] 叶世榕[2] 周晓慧[1] 海敏 

机构地区：[1]武汉大学测绘学院 [2]武汉大学卫星导航定位技术研究中心,武汉市珞喻路129号430079 [3]广西壮族自治区测绘局国土测绘处,南宁市建政路5号530023

出　　处：《武汉大学学报（信息科学版）》2008年第8期854-858,共5页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2007AA12Z312)

摘　　要：利用多期GPS观测资料计算了广西区域ITRF2000框架下的三维速度场、主应变参数及区域参考框架下的三维形变速率和形变运动趋势,研究了该区域现今地壳运动速度场及内部形变规律。结果表明,广西区域随同南华亚板块作SE-NW方向的逆时针运动,在ITRF2000框架下的东西向速率为29.3 mm/a,南北向速率为-13.4 mm/a,垂向平均速率为2.3 mm/a;区域内部现今地壳运动的形变量较大(约4 mm/a),主张应变率(5.48×10-9/a)大于主压应变率(3.70×10-9/a),地壳应变表现为拉张为主,主应变轴为N43.19°E。In order to monitor present-day crustal motion and internal deformation Guangxi area, repeated GPS eampaigns （1998, 1999, 2003, 2004 and 2007） are used rule in to calculate the 3D velocity field relative to ITRF2000, principal strain parameters and the 3D deformation velocities and deformation trends in a regional reference frame. The results show that Guangxi area along south China plate moves antieloekwise in SE-NW direction at the rate of 2.3 mm/a, and the average velocity in east-west direction is 29.3 mm/a, and the average veloeity in south-north direetion is -- 13.4 mm/a and the average vertieal veloeity is 2.3 mm/a. The present-day crustal movement in regional reference frame is relative large （about 4 mm/a）, and the principal tensile strain rate （5.48 10 ^-9/a） is larger than the compressive strain rate （3.70× 10 ^-9/a）, Guangxi area is mainly under the extension strain in the direction of N43.19^oE.

关 键 词：GPS观测站 中国地壳运动观测网络 速度场 应变参数 

分 类 号：P227.1[天文地球—大地测量学与测量工程] P228.42[天文地球—测绘科学与技术]