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2012年4月 苏门答腊海域内海洋地震性被班达-阿切大震冲增强
Matthias Delescluse1, Nicolas Chamot-Rooke, Rodolphe Cattin
1Laboratoire de Géologie, Ecole Normale Supérieure and CNRS UMR8538, 75005 Paris, France. delescluse@geologie.ens.fr
Nature
|October 2, 2012
概括
罕见的海上内部地震可能是由遥远的巨大冲击事件引发的. 压力转移和地幔放松解释了2012年沃顿盆地地震的时间.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 地震学 地震学
背景情况:
- 大地震通常发生在构造板边界.
- 内板地震,尤其是海上地震,很少发生,人们对其了解甚少.
- 2012年沃顿盆地地震是在海洋环境下发生的异常大的冲击滑动事件.
研究的目的:
- 为了调查2012年沃顿盆地地震的原因.
- 为了了解巨型地震和板内变形之间的关系.
- 分析压力转移和地幔动态在触发板内事件中的作用.
主要方法:
- 对2012年沃顿盆地地震及其余震的分析.
- 库伦应力变化计算以建模应力转移.
- 探讨在天层地幔中粘性放松的研究.
主要成果:
- 2012年的地震与2004年的阿切和2005年的尼亚斯大地震带来的压力变化有关.
- 这些应力变化促进了先前存在的飞机的罢工滑动故障.
- 地幔中的粘性放松解释了大推力和板内事件之间的时间延迟.
结论:
- 巨型地震可以通过压力转移触发海上内部板块地震.
- 地幔动力学在地板内地震事件的时间表中起着至关重要的作用.
- 这些发现为板块构造学和印度-澳大利亚板块系统的演变提供了洞察力.
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