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本文用平面应变有限元方法,模拟了西南地区1970年—1976年5次大于7级地震的蕴育过程中,介质性质变化对区域应力场的影响,给出了各次地震蕴育影响场的分布图象和影响场的基本特征。由计算结果与大震前的地震活动、前兆观测资料对比得到,地震前的异常与影响场的应力变化有关。
In this paper, the plane strain finite element method is used to simulate the influence of the change of the medium property on the regional stress field in the process of the implication of the earthquakes with magnitude greater than 7 in 1970 ~ 1976 in the Southwest China. Distribution of images and the basic characteristics of the field. The calculated results are compared with the seismic activity before the earthquake and the observation data of precursors. The anomalies before the earthquake are related to the stress changes in the field.