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SCIENTIA SINICA Terrae, Volume 47, Issue 11: 1329-1338(2017) https://doi.org/10.1360/N072017-00268

2017M7.0级九寨沟地震同震库仑应力变化及其与2008年汶川地震的关系

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  • ReceivedAug 15, 2017
  • AcceptedOct 13, 2017
  • PublishedOct 25, 2017

Abstract

2017年8月8日, 四川九寨沟地区发生M7.0级强震, 造成了重大人员伤亡和财产损失. 判断余震可能的发生趋势、圈定震区周边未来可能的强震危险区, 对于指导灾民安置、灾后重建等具有重要的参考价值. 本文利用弹性位错理论和分层岩石圈模型, 计算了汶川地震和九寨沟地震引起的应力场变化, 讨论了九寨沟地震与汶川地震之间的关系、九寨沟地震对余震分布以及周边主要活动断层上应力积累的影响. 结果表明: (1) 汶川地震导致的同震及震后应力变化显著增强了九寨沟地震震源处的应力积累, 有效地促进了九寨沟地震的发生; (2) 九寨沟地震所导致的同震库仑应力场变化较好地解释了目前所记录到的余震的空间分布; (3) 东昆仑断裂玛曲-荷叶段、虎牙断裂北端受九寨沟地震影响, 应力积累状态提升, 地震危险性有所增强.


Funded by

国家自然科学基金项目(41674106)


Acknowledgment

感谢中国地震局监测预报处对本工作的大力支持. 感谢中国地震局地球物理研究所“国家数字测震台网数据备份中心”和四川省地震局提供了近震地震波形资料, IRIS为本研究提供了波形数据. 在本文完成过程中, 主编、编委和审稿人提出建设性的修改意见, 特此感谢. 本文图件均用GMT软件绘制.


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