Abstract: In this paper a simulation of the tectonic stress field in Sichuan-Yunnan rhombic block is conducted using a finite element technique from the absolute stress data at actual measurement depth of 500m. The relation ship between the tectonic stress state and the distribution of strong earthqukes in the area is analyzed. The computed result is basically consistent with the actual measurement data. Three zones with maximum shear stress inside the tectonic stress field correspond to the three seismic zones in this region. The obtained result reveals quantitatively the distribution and state of the present tectonic stress in this region.

Key words: Sichusn-Yunnan rhombic block, Tectonic stress field, Numerical simulation

摘要： 本文以滇西北的实测绝对应力资料为依据,用有限元方法模拟了川滇菱形块的构造应力场;讨论了该地区构造应力状态与强震分布的关系;计算成果与实测地震数据基本吻合,由数值分析得到的三个最大剪应力高区,分别对应于菱形块两侧的三个地震带。定量地展现了该区现今构造应力的分布状态。

关键词: 川滇菱形块, 构造应力场, 数值模拟