地电证据表明,流体控制着沿着板块接口的缓慢和定期的地震
Hayato Nakamura1, Hiroshi Ichihara2, Tada-Nori Goto3
1Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan.
Scientific reports
|May 16, 2025
概括
孔水的分布显著影响了地震的行为,在流板边界. 这项研究表明,潮湿地区与缓慢滑动的地震相关,而干燥地区与快速断层滑动有关.
科学领域:
- 地质物理学 地质物理学
- 地震学 地震学
- 构造学 构造学 构造学 构造学
背景情况:
- 压力板接口承载着各种各样的地震事件,包括破坏性和缓慢的地震,由不同的断层滑动率驱动.
- 孔水是影响这些滑动机制及其空间分布的关键但未被充分研究的因素.
- 了解孔腔流体动力学对于地震危险评估和灾害减轻至关重要.
研究的目的:
- 为了研究孔隙流体在浅浅的降温板接口上的空间分布.
- 为了将观察到的孔液分布与不同的断层滑动行为 (快速与缓慢的地震) 相关联.
- 阐明孔水在控制地震破裂动态中的作用.
主要方法:
- 在日本西南部的Hyuga-nada地区进行了海洋磁探测.
- 在引板接口沿线识别出明显的电阻和导电异常.
- 将异常解释为孔隙流体稀缺 (电阻) 和丰富 (导电) 的指标.
主要成果:
- 在板面接口上绘制了稀缺孔液 (电阻异常) 和高孔液度 (导电异常) 的区域.
- 发现高孔流体区域,来源于潜伏的九州-帕劳山脊,与缓慢滑动地震发生地区相关.
- 观察到稀缺和过渡孔流体区域与快速断层滑动事件相关.
结论:
- 提供了直接的观测证据,将孔液分布与断裂行为联系起来.
- 证明孔隙水含量是断层是否表现出缓慢或快速滑动的关键决定因素.
- 突出了孔腔流体动力学在理解地震发生和潜水带的地震危险方面的重要性.
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