Abstract: The crustal structure model is established on the basis of the geoscience transect data. The precise leveling data are used as the criterion to test models. Two-dimensional numerical calculations are performed by using the finite element method to model the tectonic stress field of crust interior before the Haicheng M7.3 earthquake. Boundary conditions include both horizontal and vertical forces. Three schemes of loading are designed. Based on analyses of calculation results and considering focal mechanism solutions,the best model with proper loading scheme is chosen. With this model the mechanical and tectonic environment before the Haicheng earthquake and the evolution feature of the stress field are discussed.

Key words: Tectonic stress field, Finite element method, Seismic source, Haicheng earthquake

摘要： 根据地学断面资料建立地壳结构模型,以精密水准测量数据为检验标准,在水平力和垂直力为边界力学条件下,对海城地震区震前地壳内部的构造应力场用二维线弹性有限元法进行数值模拟计算。设计了3种受力方案,分析了模拟计算结果,结合震源机制解等实际资料,选出最佳方案模型,讨论了海城7.3级地震前震源的力学和构造环境及应力场演化特征。

关键词: 构造应力场, 有限元法, 震源, 海城地震