川滇地区次级地块及其主要断裂带现今活动研究

以位于川滇区域的陆态网和四川省CORS站速度场为约束，结合研究区已知的断裂分布情况，通过使用欧拉矢量计算方法和反欧拉矢量计算方法求出每个次级块体的欧拉矢量，进而对川滇区域次级块体作进一步的调整。同时对该区域进行1°×1°的网格插值，并利用各次级地块的欧拉矢量反演出每个次级块体的长期运动方向及其速度；对相邻块体的边界处，结合各自块体的欧拉矢量求出同一点在2个块体的速度并作差，进而研究分析各主要断裂带的现今活动速率。

Analysis of the Current Activity in Sichuan-Yunnan Region and Its Sub Blocks of Main Faults

We take the GPS stations speed field in the Sichuan-Yunnan region as constraints and combine them with the known situation of fault distribution in the study region. Then, by using the Euler vector calculation and reversed Euler vector calculation methods, we get the Euler vector of each sub block. We make further adjustments to the Sichuan Yunnan region of sub blocks. We make a 1°×1° grid interpolation for the region, and reverse the long-term movement direction and speed of each sub block by using the Euler vector of each sub plate. With regard to the boundary of neighboring blocks, combining the Euler vector of respective blocks, we calculate the speed of the same point in the two blocks and subtract. Then we analyze the current rate of the main fault region.