Abstract:

One of the principal goals of studying active faults is to understand the possibility of earthquakes.Contemporary faults activities are most important from this point of view.When a fault slips,the surrounding strain field changes.The linear elastic dislocation theory provides a powerful tool to solve problems associated with strain field changes due to fault slip.In some widely acknowledged studies in fields such as interpreting InSAR pattern of seismic fault slip and analyzing stress transfer or stress t

Key words: borehole strain observation, fault activity, inversion, dislocation, Genetic Algorithm（GA）

摘要：

研究断层活动性的主要目的之一是了解地震危险性,与地震危险性最直接相关的是现今的断层活动情况。如果对当地断层分布和性质有比较清楚的了解,那么就可以根据位错理论用钻孔应变仪观测资料反演断层活动。用遗传算法进行这种反演可以在进行全局搜索的同时大大提高计算效率。北京地区的活断层研究程度比较高,同时有比较密集的钻孔应变观测台站。利用2003—2005年钻孔应变观测资料对北京地区活断层活动的初步尝试性反演表明,在此期间顺义-良乡断层北段和南口-孙河断层东南段的活动可能起主导作用,活动程度与小震活动有关系

关键词: 钻孔应变观测, 断层活动, 反演, 位错, 遗传算法