【摘要】 基于细胞自动机模型,构建了由81×81个细胞单元组成非均匀二维单断层介质样本,研究了断层结构细观非均匀性以及相关模型参数变化对模拟输出结果和强度分布特征的影响。研究结果表明:结构非均匀性是影响地震活动性的控制性参量,随着非均匀程度的增强,地震事件数量增多,震级分布变得越来越均匀,破裂演化模式由相对"脆性"向"塑性"变化;介质结构的初始条件和应力加载的随机性对地震活动演化过程基本不产生影响,此外,应力降分配系数减小使b值主体线性段向大震级延伸;随着局部摩擦损耗系数增大,模拟地震事件的数量有所增加,大震级事件数量和震级衰减增强b,值主体线性区间变窄,使断层的变形破坏方式由相对"脆性"向"塑性"变化。这些对理解孕震过程的复杂性是有帮助的。更多还原

【Abstract】 For the purpose of investigating conditions of earthquake pregnancy,a heterogeneous 2-D single fault model with 81×81 cells is set up.By using cellular automata models and changing the model heterogeneity and correlation parameters respectively,we compute and get different synthetic event catalogues for analyzing general seismic activity and intensity distribution properties.The computation results show that different heterogeneous structures produce different seismic sequence types and G-R relation,so the heterogeneity is an important influencing factor on seismicity.Nevertheless,both the coefficients of stress redistribution and local friction loss can also influence seimicity to some extent.It is possibly helpful for further understandings of earthquake process complexity.更多还原