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针对川滇地区地震活动频繁的现状,该文首先对1998—2008年和2008—2015年该地区两期GNSS连续观测数据进行解算(时间节点为汶川地震);然后结合前人对川滇区域棱形块体的划分方案,基于欧拉矢量计算方法求出各块体的欧拉矢量以及旋转极经度、旋转极纬度、旋转角速度,并通过反欧拉矢量方法反演出鲜水河-小江断裂带和龙门山断裂带的错动趋势变化。结果表明:汶川地震造成两条断裂带在错动方向和错动速率方面均有变化,并且主要集中在川滇区域北部和西部的断裂带上。
In view of the frequent seismicity in Sichuan-Yunnan region, this paper first solves two GNSS continuous observation data in the region from 1998 to 2008 and from 2008 to 2015 (the time node is Wenchuan earthquake). Then, Based on the Euler vector method, the Eulerian vector, the polar pole, the pole rotation and the rotational angular velocity of each block were calculated and the results of inverse Euler vector method were derived from the Xianshuihe-Xiaojiang fault Dislocation trends of Longmen Shan fault zone and Longmenshan fault zone. The results show that the two Wenchuan earthquakes caused the two fault zones to change both in the direction of the fault dislocation and in the rate of dislocation, and are mainly concentrated in the fault zones in the northern and western Sichuan-Yunnan regions.