Abstract: The stress fields of en echelon faults with different geometry and mechanical conditions were considered by dynamically numerical simulation. The effect of geometry on stress field pattern is discussed. The disturbed stress fields caused by fault propagation were calculated and their effects on the neighboring fault were investigated. Around the propagating fault segment the disturbed stress field of maximum shear stress displays an eight petal pattern and that of mean stress displays a four quadrant pattern. Interest is that when there are several propagating segments in a narrow area,the disturbed stress fields remain the same patterns.

Key words: Stress field, Numerical simulation, En echelon structure, Fault geometry

摘要： 用数值模拟方法研究了几何、力学条件不同的雁列构造模型的应力场,探讨了几何参数对应力场的影响。模拟结果表明,在几何参数不同的情况下,雁列构造中局部断层扩展引起的应力扰动场会对相邻构造产生作用。围绕断层扩展部位剪应力增量场呈八瓣式分布,平均应力增量场呈四象限分布。在较小范围内同时存在几个断层扩展区的情况下,围绕这个弱化区仍可形成上述增量场图案。

关键词: 应力场, 数值模拟, 雁列构造, 断层几何