Subduction zone geodynamics and earthquake processes

俯冲带地球动力学和地震过程

• 批准号: RGPIN-2016-03738
• 负责人: Wang, Kelin
• 金额: $ 2.62万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=668097
• 关键词: Subduction; zone; geodynamics; earthquake; processes

This proposal seeks limited funds to provide partial support for two to three graduate students at any given year over the next five years as part of my research program. The proposed research is designed to understand the works of subduction zones, for which the Cascadia subduction zone off Canada's west coast is a near-home example. The students will study what enables megathrust faults to generate large earthquakes and what makes them creep in slow slip events, how stress is built up and relieved in earthquake cycles to affect the geology of the upper plate, whether and why seismic activities in areas very far apart are physically connected, and so forth. The proposed research addresses fundamental geodynamics, and it helps society to understand what causes seismic and tsunami hazards. Our main method is to use computer modelling to explain global multidisciplinary observations to reveal underlying physical principles. The students are directed to develop geodynamic concepts from large volumes of observations and basic principles, not merely from textbooks and conventional models.***With the long-term goal of understanding the geodynamics of subduction margins, especially processes that govern earthquake generation, we will proceed in three interrelated research directions over the next five years. The first direction is to explore the link between earthquake cycle deformation and geological deformation. We need to examine subduction margins around the world and develop models with realistic, although complex, mechanical properties to investigate stress and structural evolution over individual and multiple earthquake cycles. The second direction is to study whether the decoupling of the shallow and harder part the Earth (the lithosphere) and the deeper and softer part (the asthenosphere) can explain seemingly mysterious long-range interactions of regions very far apart, either in the same subduction zone or in different subduction zones. The third direction is to address how temperature and fluids control the slip behaviour of subduction faults, in particular to develop a unified model to explain geophysical conditions for slow slip events and the relation of these events with the part of the fault that generates great earthquakes. **

作为我的研究计划的一部分，该提案寻求有限的资金在未来五年内的任何一年中为两到三名研究生提供部分支持。拟议的研究旨在了解俯冲区的作品，加拿大西海岸附近的卡斯卡迪亚俯冲带就是一个​​近户主的例子。学生们将研究使大地震发生大地震的原因，以及使他们在慢速滑移事件中蔓延的原因，如何在地震周期中积累和缓解压力，以影响上层板块的地质，无论区域分开的地震活动以及为什么物理相互联系的地震活动都与众不同。拟议的研究涉及基本的地球动力学，它有助于社会了解导致地震和海啸危害的原因。我们的主要方法是使用计算机建模来解释全球多学科观察，以揭示基本的物理原理。指示学生从大量的观察和基本原理中发展出地球动力学概念，这不仅是从教科书和常规模型中。第一个方向是探索地震周期变形与地质变形之间的联系。我们需要检查世界各地的俯冲边缘，并开发具有逼真但复杂的机械性能的模型，以研究个人和多个地震周期的压力和结构演变。第二个方向是研究地球（岩石圈）的浅层和较硬的部分以及更深柔软的部分（流动层）是否可以解释区域相距很远的区域的长距离相互作用，无论是在同一俯冲区还是在不同的俯冲区域中。第三个方向是解决温度和流体如何控制俯冲断层的滑移行为，特别是开发一个统一模型来解释慢滑动事件的地球物理条件以及这些事件与产生巨大地震的断层的一部分之间的关​​系。 **