Geological constraints on the mechanisms of slow earthquakes

慢震机制的地质限制

• 批准号: RGPIN-2022-04193
• 负责人: Kirkpatrick, James
• 金额: $ 2.62万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=751013
• 关键词: Geological; constraints; mechanisms; slow; earthquakes

Earth's tectonic plates are constantly moving and slipping by one another. Although the tectonic plates move at constant velocities over geological time, the rates of motion at the plate boundaries, where relative motions are localized, are much more complex. Observed slip rates across plate boundaries range from very sudden, rapid motion in earthquakes to creep at approximately the long-term average of the plates on either side. Recent seismological and geodetic observations have defined a suite of phenomena, called `slow earthquakes', which are like regular earthquakes, but their slip rates are slower so they can last for weeks. Because slow earthquakes happen more frequently than regular earthquakes in some places, they present an exciting window into the controls on slip at depth. If we could understand the mechanisms of slow earthquakes, they might be a tool for monitoring and forecasting large, potentially devastating regular earthquakes. In the next five years, my research program will focus on slow earthquakes to inform the basic physics that controls them and to investigate how slow earthquake slip is related to seismic slip and creep. My research group and I will address several key objectives: 1. Determining what limits the slip rate in slow earthquakes to stop them becoming regular earthquakes; 2. Explaining how slow earthquakes can occur in a wide variety of tectonic settings by establishing the underlying process; 3. Defining the spatial and temporal relations between slip in slow and regular earthquakes to assess potential causal relations between them; 4. Determining what controls the sizes of slow earthquakes. We will implement an integrated geological field, micro-analytical, and experimental research program that is designed to overcome the spatial resolution limitations of seismology and geophysics. This work will be at the forefront of the emerging field of geologically focused research seeking to investigate slow earthquakes by yielding genuinely novel data that target specific aspects of the mechanisms of slow earthquakes. The outcomes can provide the foundation for modelling and observational work that defines how slow and regular earthquakes modulate one another and, ultimately, may lead to a basis for using slow earthquakes as a tool for forecasting future earthquakes. This research program will support four graduate ¬level and five or more undergraduate research projects. I work hard to create a training environment that is fair, transparent, and inclusive. My training philosophy incorporates steps throughout the research experience, from recruitment to graduation, that aim to broaden participation in the Geosciences, particularly from under-represented groups. By participating in my research program, trainees will develop a valuable range of technical, data analysis, project management, writing, and presentation skills to prepare them for careers in a range of science and engineering industries or academia.

地球的构造板块在不断地移动和滑动。虽然构造板块在地质时期内以恒定的速度运动，但在板块边界处的运动速率要复杂得多，因为那里的相对运动是局部的。观测到的板块边界的滑动速率范围从地震中非常突然的快速运动到两侧板块的长期平均蠕变。最近的地震学和大地测量学观测确定了一系列称为“慢地震”的现象，这些地震与常规地震相似，但滑动速度较慢，因此可持续数周。因为在某些地方，慢地震比常规地震发生得更频繁，它们为控制深度滑动提供了一个令人兴奋的窗口。如果我们能够理解慢地震的机制，它们可能成为监测和预测大的、潜在的破坏性常规地震的工具。在接下来的五年里，我的研究计划将侧重于慢地震，以告知控制它们的基本物理学，并调查慢地震滑动与地震滑动和蠕变的关系。我的研究小组和我将解决几个关键目标：1。确定是什么限制了慢地震的滑动速率，以阻止它们成为常规地震; 2。通过建立潜在的过程，解释慢地震如何在各种各样的构造环境中发生; 3。定义慢震和常规地震滑动之间的空间和时间关系，以评估它们之间的潜在因果关系; 4.确定是什么控制了慢地震的规模。 我们将实施一个综合的地质领域，微观分析和实验研究计划，旨在克服地震学和地球物理学的空间分辨率限制。这项工作将处于以地质为重点的新兴研究领域的最前沿，旨在通过产生针对慢地震机制特定方面的真正新颖的数据来调查慢地震。这些结果可以为建模和观测工作提供基础，这些工作定义了慢地震和常规地震如何相互调节，最终可能为使用慢地震作为预测未来地震的工具奠定基础。该研究计划将支持四个研究生水平和五个或更多的本科生研究项目。我努力创造一个公平、透明和包容的培训环境。我的培训理念包括整个研究经验的步骤，从招聘到毕业，旨在扩大地球科学的参与，特别是从代表性不足的群体。通过参加我的研究计划，学员将开发一系列有价值的技术，数据分析，项目管理，写作和演讲技巧，为他们在一系列科学和工程行业或学术界的职业生涯做好准备。