1990年菲律宾Mw7.7级强震对马尼拉俯冲带静态应力触发影响  

A PRELIMINARY STUDY ON STATIC STRESS TRIGGERING EFFECTS ON MANILA SUBDUCTION ZONE BY THE PHILIPPINE Mw7.7 EARTHQUAKE 1990

作　　者：李健[1,2] 詹文欢 朱俊江[3,4] 孙杰 冯英辞 姜莲婷[1] 郭磊 唐琴琴 

机构地区：[1]中国科学院边缘海与大洋地质重点实验室(南海海洋研究所),广州266100 [2]中国科学院大学,北京100049 [3]海底科学与探测技术教育部重点实验室,中国海洋大学海洋地球科学学院,青岛266100 [4]青岛海洋科学与技术国家实验室海洋地质功能实验室,青岛266237

出　　处：《海洋地质与第四纪地质》2017年第6期93-99,共7页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(41376063)

摘　　要：基于震源机制解模型和弹性半空间模型,计算了1990年7月16日Mw7.7级地震所产生的静态库伦应力变化,研究结果表明Mw7.7级地震触发了其后Mw6.0级和Mw6.5级2次强余震的发生,应力加载值分别达到了21.63bars和9.15bars。依据地震重复原则和构造外推原则,以马尼拉俯冲带及其附近区域Mw6.0级以上地震震源机制解中的一个节面作为接收断层面,计算了Mw7.7级地震对马尼拉俯冲带区域静态库伦应力的影响,结果表明其对马尼拉俯冲带的影响主要集中在西吕宋海槽的部分断层上,但变化量值很小,对马尼拉俯冲带北部区域基本不产生影响。Based on the solutions of earthquake focal mechanism and the half space homogeneous elastic model,we calculated the variation in stress fields after the Mw7.7 earthquake.Our results show that the two subsequent strong aftershocks were triggered by the Mw7.7 earthquake of 16 July 1990,and the static Coulomb stress increased by 21.63 bars and 9.15 bars,respectively.Based on the principles of earthquake recurrence and the structural extrapolation,we used the earthquake focal mechanism solutions for the events greater than Mw6.0 along the Manila Trench and its adjacent region,one of the nodal plane of the focal mechanism was taken as the receive fault plane in the static stress triggering calculation.The results show that the effect of static Coulomb stress on the Manila subduction zone caused by the Mw7.7 is mainly concentrated in some faults of the West Luzon Trough,but the variation in Coulomb stress is very small,which has little effect on the northern area of the Manila subduction zone.

关 键 词：应力触发 震源机制解 马尼拉俯冲带 

分 类 号：P738[天文地球—海洋地质]