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在中国境内所有的二级块体运动中,川滇区域的地壳运动最为活跃,也是各学者研究的热点领域。本文通过对1998—2008年和2008—2015年两期GNSS连续观测数据的解算(时间节点为汶川地震),并结合前人对川滇区域棱形块体的划分方案,利用欧拉矢量计算出各次级块体的欧拉矢量。对该区域进行了网格插值从而反演两期地壳运动变化特征,以及通过在断裂带上或断裂带附近选取一点来研究相邻块体的相对运动趋势变化,并对该区域内地块垂向运动作了初步研究分析。结果表明,汶川地震并没有造成该区域整体运动特征的改变,但对一些局部块体的运动和相邻块体的相对运动带来了一定的影响。
Among all the secondary block motions in China, the crustal movement in Sichuan-Yunnan region is the most active and is also a hot area of research by scholars. Based on the solution of the GNSS continuous observation data from 1998-2008 and 2008-2015 (the time node is Wenchuan earthquake), and combining with the predecessors’ division scheme of prismatic blocks in Sichuan-Yunnan region, this paper calculated Euler vector The Euler vector of each sub-block. The regional grid interpolation was carried out to invert the features of the two crustal movements and to study the change of relative movement trend of adjacent blocks by selecting a point on the fault zone or near the fault zone. Made a preliminary analysis of the movement. The results show that the Wenchuan earthquake has not caused the change of the overall movement characteristics in this area, but it has some impact on the movement of some local blocks and the relative movement of adjacent blocks.