GPS结果应用于地面沉降研究初探

本文利用球面通量均衡基准对全国的GPS垂向分量进行处理,给出了GPS点的垂向运动矢量分布图,显示垂向相对变化的分布与活动构造相关;2007-2009年的结果显示该时段可能存在大地震的影响;同时重点分析讨论了天津及其周边地区的地面沉降现状。结果表明采用文中的方法对GPS垂向分量进行处理是有效的,能够显示出地壳垂直差异运动的空间分布信息。

Primary discussion about the application of GPS results to research of ground subsidence

In order to find the way of application of GPS data to the research on ground subsidence,the vertical vectors of the repeated mobile GPS solutions nation wide including 1999,2007 and 2009 in the project of "China Crust Movement Measuring Network" were processed with the method of spherical flux isostatic datum in this paper.Distribution maps of the vertical vectors were given and it was shown that the vectors’ distribution is related with actively geological structures;The results of the data from 2007 to 2009 may show the influence of great earthquakes on crust vertical deformation in this period;simultaneously the situation of ground subsidence in Tianjin and the surrounding regions were discussed.The results suggested that the data processing method of GPS vertical vectors was effective,and it was able to show the information distribution for crust vertical movement.