中美洲以下的热和脱水状态的变化:对地震板接口的洞察力
Rui Qu1,2, Yingfeng Ji1,2, Lijun Liu3,4
1State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
iScience
|October 11, 2023
概括
中美洲的缓慢地震与更温暖的可可板和流体诱导的压力变化有关. 这项研究阐明了大地震事件之前的复杂断层机制.
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:
- 哥斯达黎加的缓慢地震和偶尔的震动表明,在中美洲的巨型冲击沿线存在不稳定的断层.
- 驱动这些现象的精确机制及其与巨型地震的联系尚未完全理解.
- 潜水接口合的变化是隐含的,但表征不佳.
研究的目的:
- 为了研究中美洲潜伏区下方的热态和流体分布的沿冲动变化.
- 为缓慢地震和偶发震动的潜在机制提供见解.
- 了解俯冲区动态和地震活动之间的关系.
主要方法:
- 使用了先进的3D热建模.
- 分析了热状态和液压分布.
- 检查了板块几何和脱水率.
主要成果:
- 沉积的科科斯板块比以前估计的要温暖得多.
- 石块几何学显示了沿着沟显著的扰动.
- 高的脱水率与地震深度相关.
- 孔隙流体压力增加,由起的板块流体驱动,发生在尼科亚半岛和危地马拉-尼加拉瓜段以下.
- 这些压力与缓慢的滑动事件和定期的地震有关.
结论:
- 这项研究揭示了一个更温暖的降温的科科斯板块,其复杂的几何结构影响了降温区的动态.
- 由于板块脱水而导致的液体压力的增加是引发慢滑事件和地震的关键因素.
- 这些发现提高了对该地区断层不稳定性和地震危害的理解.
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