Inversion of fluid-release rates from episodic tremor and slip signals in subduction zones via a coarse-grained reaction diffusion model

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Physics of the Earth and Planetary Interiors Pub Date : 2024-06-27 DOI:10.1016/j.pepi.2024.107223
Qingpei Sun , Klaus Regenauer-Lieb , Manman Hu
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Abstract

Episodic Tremor and Slip (ETS) events showcase dynamic interactions of oscillatory slow slips and tremors deep within subduction zones and offer a window into Earth's internal dynamics. However, the exact mechanisms driving these events remain unresolved. This study proposes a novel approach that goes beyond traditional explanations focused on fluid pressure from mineral dehydration. Existing models often neglect the intricate interplay between fluid and rock pressures across various depths and potential fluid sources. This calls for a more comprehensive understanding of how fluid release from reactions interacts with rock deformation. The present formulation captures the interplay between fluid and solid pressures providing a more rigorous picture of ETS events. It employs a minimalistic and efficient approach based on integrating dehydration reactions. The model thereby develops a generic framework for mineral dehydration, offering an enhanced perspective of the underlying processes without the need to trace down to specific minerals. It allows a refined fit to GPS data by including high-frequency components from linear and nonlinear stability analyses, giving rise to improved correlation coefficients. Through the inclusion of the dynamic interplay between fluid and rock pressure diffusion within subduction zones, we propose a unified model of ETS events.

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通过粗粒度反应扩散模型反演俯冲带偶发性震颤和滑动信号的流体释放率
偶发震颤和滑动(ETS)事件展示了俯冲带深处振荡性缓慢滑动和震颤的动态相互作用,为人们了解地球内部动力学提供了一个窗口。然而,驱动这些事件的确切机制仍悬而未决。这项研究提出了一种新方法,超越了以矿物脱水产生的流体压力为重点的传统解释。现有模型往往忽视了不同深度和潜在流体源的流体压力与岩石压力之间错综复杂的相互作用。这就要求对反应释放的流体如何与岩石变形相互作用有更全面的了解。本模型捕捉到了流体压力和固体压力之间的相互作用,为 ETS 事件提供了更加严谨的描述。它采用了一种基于整合脱水反应的简约而高效的方法。因此,该模型为矿物脱水建立了一个通用框架,提供了一个更好的视角来观察基本过程,而无需追溯到具体的矿物。通过纳入线性和非线性稳定性分析的高频成分,该模型可对 GPS 数据进行精细拟合,从而提高相关系数。通过纳入俯冲带内流体和岩石压力扩散之间的动态相互作用,我们提出了一个统一的 ETS 事件模型。
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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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