GPS约束下川滇地区主要断裂现今活动速率的估算方法

摘要

以川滇地区的GPS水平速度场为约束,建立由24个块体组成的线性弹性块体模型,剔除块体内部变形等对GPS测站速度的影响,反演得到各块体的长期运动速度及各主要边界断裂的现今活动速率.结果显示,在考虑块体内部弹性形变时,拟合速度残差中误差由1.46mm/a减小至1.15 mm/a.因此,在用块体模型分析复杂构造地区的运动特征时,还需顾及块体内部形变的影响.%In order to obtain the long-term motions of blocks and contemporary slip rates along major bounding faults in Sichuan-Yunnan region, we built a GPS-constrained linear elastic block model with 24 blocks and eliminated the effect of internal deformation of each block. After the elimination of internal deformation effect, the results show that the RMSE of residual velocities decreased from 1.46 mm/a to 1.15 mm/a. Therefore, one should consider the elastic internal deformation effect when analyzing the motion characteristics of tectonically complicated region using block model.