汶川8.0级地震触发与余震活动空间分布研究

地震 ›› 2009, Vol. 29 ›› Issue (1): 33-39.

汶川8.0级地震触发与余震活动空间分布研究

华卫^1,2, 陈章立³, 李志雄¹, 赵翠萍¹, 王勤彩¹

1.中国地震局地震预测研究所, 北京 100036;
2.广东省地震局, 广东广州 510070;
3.中国地震局, 北京 100036

收稿日期:2008-11-03 修回日期:2008-11-16 出版日期:2009-01-31 发布日期:2021-10-15
作者简介:华卫(1971-), 男, 江西南城人, 博士学位, 高级工程师, 主要从事数字地震学等研究。
基金资助:
地震行业科研专项(200708026)

Seismic Triggering and the Aftershock Distribution of the Wenchuan M8.0 Earthquake

HUA Wei^1,2, CHEN Zhang-li¹, Li Zhi-xiong¹, ZHAO Cui-ping¹, WANG Qin-cai¹

1. Institute of Earthquake Science, CEA, Beijing 100036, China;
2. Earthquake Administration of Guangdong Province, Guangzhou 510070, China

Received:2008-11-03 Revised:2008-11-16 Online:2009-01-31 Published:2021-10-15

摘要/Abstract

摘要： 文中分析研究了2008年汶川8.0级地震发震构造即龙门山断裂带历史和现今地震活动情况, 并计算主震发生后产生的库仑破裂静应力变化, 讨论了地震触发与余震空间分布之间的联系。结果表明, 龙门山断裂带以虎牙—北川—安县为界分为二段, 西南段和东北段在地震活动性方面存在着较大的差异。虽同处一条断裂带上, 但两者之间地震活动没有联系。汶川8.0级主震发生之后, 在空间上产生的库仑破裂静应力变化具有很明显的分区特征。龙门山断裂带北川至青川之间库仑破裂应力变化值大于+0.05 MPa, 主震对该地区后续M_L≥5.0余震的发生存在着触发作用。

关键词: 汶川地震, 应力触发, 余震活动, 库仑破裂静应力

Abstract: In this paper, we study the historical and current seismicity in the Longmenshan fault where Wenchuan M8.0 earthquake occurred in 2008, and calculate the Coulomb failure static stress changes derived from the mainshock and discusses the relation between the seismic triggering and the distribution of aftershocks. The results show that the Longmenshan fault can be divided by the line marked by Huya-Beichuan-Anxian, and there is a big difference of seismicity in the Southwest and Northeast parts. Seismicity in these two areas has no relation though they belong to the same fault. The Coulomb failure static stress changes in space have obvious segmentation characteristics after the Wenchuan M8.0 mainshock occurred. The values of Coulomb failure static stress changes between Beichuan and Qingchuan in the Longmenshan fault are larger than 0.05 MPa, indicating seismic triggering effects on the aftershocks occurred later in the area.

Key words: Wenchuan earthquake, Seismic triggering, Aftershock activity, Coulomb failure static stress changes

中图分类号:

P315.7

华卫, 陈章立, 李志雄, 赵翠萍, 王勤彩. 汶川8.0级地震触发与余震活动空间分布研究[J]. 地震, 2009, 29(1): 33-39.

HUA Wei, CHEN Zhang-li, Li Zhi-xiong, ZHAO Cui-ping, WANG Qin-cai. Seismic Triggering and the Aftershock Distribution of the Wenchuan M8.0 Earthquake[J]. EARTHQUAKE, 2009, 29(1): 33-39.

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