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测绘学报  2015 

广西区域现今地壳运动与应变的GPS监测分析

DOI: 10.11947/j.AGCS.2015.20130566, PP. 858-865

Keywords: GPS,地壳运动,速度场,应变参数

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Abstract:

利用GAMIT/GLOBK软件分析了1998-2010年间多期GPS观测数据,获得了ITRF2005框架下广西区域现今地壳运动三维速度场和应变场参数,并对区域形变场和现今构造运动动力学机制进行了初步讨论。GPS监测结果显示广西区域现今地壳运动随华南块体作南东东方向的逆时针构造运动,ITRF2005框架下水平方向平均速率为33.49mm/a,优势方向为N109.3°E;垂直方向平均速率为+1.30mm/a,整体趋势是自桂东向桂西方向垂向速率逐步增加。现今应变状态以N127.3°±4.8°E挤压为主,最大主压应变率-2.7±0.5×10-9/a;兼有N37.3°±4.8°E方向的拉张作用,最大主张应变率1.8±0.2×10-9/a。本文研究结果为描述广西区域现今地壳运动提供了一个更加精细的三维速度场。

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