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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。
In this paper, we use the spherical flux equilibrium benchmark to process the vertical component of GPS in China, and give the distribution chart of the vertical motion vector of GPS point, which shows that the distribution of vertical relative change is related to the active structure. The impact of major earthquakes may exist during the period; meanwhile, the present situation of land subsidence in Tianjin and its surrounding area is analyzed and discussed in detail. The results show that it is effective to deal with the vertical component of GPS using the method in this paper, which can show the spatial distribution of the vertical differential movement of the crust.