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本文用平面问题的有限元方法,在研究云南地震与应力场关系之后,采用先计算大区域应力场,再计算小区域应力场的分步办法。 首先研究我国西南及其邻区强震活动与构造应力场的关系。计算结果说明:(1)由于印度板块不均匀推挤,在特定的边界条件下,是产生我国西南地区应力场复杂性的主要原因。(2)在印度板块的作用下,断块间运动以及板内大范围内应力场调整是西南地区强震活动的主要因素。(3)通过四个八级以上地震(海源、古浪、察隅:印度、尼泊尔)后应力场调整的研究,未来八级地震的地区有可能在川滇藏或缅甸一带。
In this paper, by using the finite element method of plane problem, after studying the relationship between the earthquake and stress field in Yunnan, the method of first calculating the stress field in a large area and then calculating the stress field in a small area is adopted. Firstly, the relationship between the strong earthquakes and the tectonic stress field in Southwest China and its adjacent areas is studied. The calculation results show that: (1) Due to the inhomogeneous thrust of Indian plate, under certain boundary conditions, it is the main reason for the complexity of stress field in Southwest China. (2) Under the action of Indian plate, the movement between the blocks and the adjustment of the stress field in a wide range of plate are the main factors of strong earthquakes in southwest China. (3) Through the study of stress field adjustment after more than eight earthquakes (Haiyuan, Gulang, Zayu: India and Nepal), the area of the next eight earthquakes may be in the areas of Sichuan, Yunnan and Tibet or Burma.