断层位错引起的应力场变动与地震危险性预测
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摘要
断层运动引起的应力场影响相邻断层的稳定性,研究断层相互作用与地震危险性预测有密切关系.按弹性位错理论计算半无限弹性介质中矩形断层错动产生的应力场,结果表明,在中国西南与华北地区,多数后继大地震发生在剪应力S(xy)增大和正应力S(yy)减小区.地震发生概率的增益与作用于断层上的应力增量呈函数关系,剪应力增加和正应力减少可引起地震触发.定义地震触发活化系数At表示地震活动度变化,At值空间扫描有助于确定具体的危险地点.最后讨论了大范围相互作用问题.
引文
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