Faulting, fluids and geohazards within subduction zone forearcs

俯冲带弧前的断层、流体和地质灾害

• 批准号: 2892733
• 金额: --
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892733
• 关键词: Faulting; fluids; geohazards; within; subduction

The project involves study of the faulting within subduction zone forearcs and associated fluids using seismic reflection and other datasets. Slip on the subduction plate-bounding fault is known to generate large magnitude earthquakes and tsunami, but also produces internal deformation through slip on many faults within the forearc, but these have not previously been systematically studied. The main aims are to understand how these different fault systems develop, how strain is distributed through a forearc, and the role faulting plays in controlling fluid flow within such systems. Gas hydrates and mud diapirism are common at many of these margins and the interaction between faulting and fluid trapping and fluid flow in these environments will be explored. Improved understanding of the development of thrust faults, and other fault types, will provide important data on how faulting affects the potential for fluid storage, including CO2 storage for decarbonisation and trapping of hydrocarbon resources. This project is also relevant to our improved understanding of geohazards in terms of how fluids affect fault slip, generating earthquakes and tsunami, and marine slope failure, which can impact seafloor infrastructure. Example subduction zones to be used in the project are Sumatra, the Makran and Cascadia.

该项目涉及利用地震反射和其他数据集研究俯冲带前弧内的断层和相关流体。已知俯冲板块边界断层上的滑动会产生大规模地震和海啸，但也会通过弧前许多断层上的滑动产生内部变形，但这些以前没有系统地研究过。主要目的是了解这些不同的断层系统是如何发展的，如何通过一个前弧应变分布，以及断层在控制这些系统内的流体流动的作用。天然气水合物和泥底辟作用在许多这些边缘是常见的，断层和流体圈闭和流体流动在这些环境中的相互作用将被探讨。对逆冲断层和其他断层类型发展的进一步了解，将提供有关断层如何影响流体储存潜力的重要数据，包括用于脱碳和捕获碳氢化合物资源的CO2储存。该项目还有助于我们更好地了解地质灾害，包括流体如何影响断层滑动，产生地震和海啸，以及可能影响海底基础设施的海洋边坡破坏。项目中使用的俯冲带范例有苏门答腊、马克兰和卡斯卡迪亚。