摘要
本文研究分析了2005年10月8日巴基斯坦主震产生的库仑破裂应力变化对余震的影响。计算时考虑了以下因素(1)断层泥区域的孔隙流体压力和介质弹性常数与周围介质中的不同;(2)地震震源区的构造应力场方向;(3)将震源区构造应力和主震破裂产生的应力叠加计算得到余震破裂机制。该研究考虑了多种因素,计算结果与余震的分布比较吻合。结果表明2005年10月8日巴基斯坦主震对大部分余震有触发作用。
The influence to aftershocks of Coulomb failure stress change generated by the October 8, 2005, Pakistan earthquake are calculated and analyzed. The following factors are included : ( 1 ) The difference of pore pressure and elastic parameters in fault plane area and its surrounding; (2)the tectonic stress direction of seismic source areas; (3) The rupture mechanism of aftershocks are calculated according to the summation of the tectonic stress and stress change generated by mainshock. Our study, which include many factors, is more fit to aftershock distribution. It indicates that most of the aftershocks are triggered by the Pakistan mainshock occurred on October 8, 2005.
出处
《中国地震》
CSCD
北大核心
2006年第3期277-286,共10页
Earthquake Research in China
基金
国家自然科学基金(40374012)
地震科学联合基金资助项目(1005003)。
关键词
巴基斯坦地震
孔隙流体压力
断层泥
触发
Pakistan earthquake Pore fluid pressure Fault plane area Triggering