2016年11月25日阿克陶M_S6.7地震前后库仑应力变化分析

ANALYSIS OF COULOMB STRESS CHANGE BEFORE AND AFTER XINJIANG AKETAO EARTHQUAKE WITH M_S6.7 ON NOV 25^(th),2016

2016年11月25日新疆阿克陶发生M_S6.7地震,此次地震前震源附近区域中强地震活动较活跃。本文中选取2015年12月7日塔吉克斯坦和2016年6月26日吉尔吉斯斯坦相继发生的M_S7.4、M_S6.7两次地震,利用USGS得出的震源机制解及深度进行静态库仑应力的计算,分析研究这两次强震对区域地震活动的应力变化影响。同时依据阿克陶M_S6.7地震的震源机制解和深度分析其对周围区域和相应断层的应力触发作用。结果表明:(1)阿克陶M_S6.7地震发生在塔吉克斯坦M_S7.4和吉尔吉斯斯坦M_S6.7两次地震的库仑应力累积变化的增强区;(2)阿克陶M_S6.7地震对西昆仑地震带以及南天山西段柯坪断裂具有应力增加的影响,需加强对这两个区域的关注。

An earthquake with Ms6.7 occurred in Aketao country, Xinjiang, on November 25th, 2016. The activity of moderate earthquakes was more active nearby hypocenter before this earthquake. It chose Tajikistan earthquake with Ms7.4, Dec 7th, 2015, and Kyrgyzstan earthquake with Ms6.7 ,Jun 26th, 2016, at the same time, used the focal mechanism solution and depth in USGS to calculate static coulomb stress, analyzed and researched the influence of stress change on regional seismic activity for two strong earthquakes. It also analyzed stress triggering effect of Aketao earth- quake with Ms6.7 on surrounding areas and corresponding faults. The results showed that： （1） Aketao earthquake with Ms6.7 occurred in accumulated coulomb enhancement region of Tajikistan earthquake with Ms7.4 and Kyrgyzstan earthquake with Ms6.7; （2） There is stress increase influence on western Kunlun seismic belt and Keping fault in west of southern Tianshan after Aketao earthquake with Ms6.7 , which needed more concern.