四川芦山M_s 7.0级地震导致周边断层的应力变化

Stress Changes on Major Faults Caused by M_s 7.0 Lushan Earthquake

2013年4月20日,四川雅安市芦山县发生Ms 7.0级强烈地震,造成重大的人员伤亡和经济损失。地震造成的区域库仑应力变化、对周围断层的影响及后续地震带发展趋势是应该关注的问题。利用USGS震源机制解,根据地震静态触发原理,基于弹性位错理论和分层地壳模型,计算得出芦山地震引起同震库仑应力变化从断层的1.0MPa量级减小到200km外的0.1kPa,研究认为在地震之后大部分区域的应力得到释放,鲜水河断裂道孚—康定段和玉龙希断裂南段危险性增加。

On April 20. 2013, a MS 7.0 eallhquake happened in l,usham Sichuan Province, which killed and hutted hundreds of people, also resulted in huge financial loss. People usually cared about the changes of coulomb faihu＇e stress caused by the earthquake, and Ihe effect on the adjacent faults, and subsequent progress afler this earthquake. Based on seismic static triggering principle, the elastic disloction theory, layered crustal model, we used the USGS focal mechanism solution, the eoseismie coulomb failure stress is 1.0MPa to 0.lkPa from fauh plane to 200km. stress was released in most of the area, however, the Daofil and Yulongxi Segment of Xianshuihe Fauh became more dangerors.