Improving Earthquake Ground Motion Prediction Across Canada

在地震地面运动预测中存在着很大的不确定性：地震破裂将如何在时间和空间上传播？地震震动的分布会是什么？我的建筑能抵挡住震动吗？我的研究计划的长期愿景是改进对整个加拿大地震地面震动的预测，特别是了解地震波沿其路径(区域尺度)穿过地球地质层以及在地表场地(局部尺度)传播时如何变化。为了实现这些目标，我将开发和应用最先进的地球物理技术：基于现场的微震方法和理论3D波传播模型。估计地震的影响或后果直接取决于对地震地面震动的估计，而地震地面震动的估计取决于对场地反应和地质放大的了解。这一理解将为一系列旨在估计和减轻潜在地震损失的多学科工作提供信息，这些损失包括人员伤亡、建筑损坏和系统中断。我的研究计划将通过三个主要目标来实现：1.加拿大西部和东部的场地特征研究：将在艾伯塔省、不列颠哥伦比亚省和安大略省进行基于现场的地震测量，以了解加拿大西部和东部土壤放大的差异并将其参数化。这一目标将提供对加拿大不同地质背景下地震现场反应的了解。通过计算方法解决地面运动的不确定性：将对加拿大特定地区的地震进行3D地球模型内地震破裂的数值计算。这些计算模拟将解决记录的地震数据中的当前差距，并量化地震地面震动的潜在范围(不确定性)。改进当前地震现场响应预报器(S)：不同频率(频谱)的地震地面运动幅度将通过地震和基于现场的地震测量以及针对典型加拿大地质环境的计算模拟来确定。然后，可以针对加拿大西部和东部的典型地质推导出频谱放大的定量不确定范围，以提高我们对地震场地响应及其在未来建筑规范中的处理的理解。准确预测地震地面运动对于生命安全(工程设计指南和规范)和规划(土地使用管理、应急响应、业务连续性、保险费率等)非常重要。目的。因此，拟议的研究对地震工程界以及科学界和应急管理界都很重要。

There is a lot of uncertainty in earthquake ground motion prediction: How will the earthquake rupture propagate in time and space?, What will be the distribution of earthquake shaking?, Will my building withstand the shaking? The long-term vision of my research program is to improve prediction of earthquake ground shaking across Canada, in particular understanding how earthquake waves are altered as they travel through the earth's geologic layers along their path (regional scale) and at a surface site (local scale). To achieve these goals, I will develop and apply state-of-the-art geophysical techniques: field-based microtremor methods and theoretical 3D wave propagation modelling. Estimating the impact or consequences of an earthquake depends directly on estimates of earthquake ground shaking, which are reliant on understanding site response and geological amplifications. This understanding will inform a range of multi-disciplinary works aimed at estimating and mitigating potential earthquake losses in the forms of casualties, building damage, and system interruptions.My research program to understand earthquake site response behaviour and thereby predict expected variation in ground shaking will be achieved by three main objectives:1. Site characterization studies in western and eastern Canada: Field-based seismic measurements will be performed in Alberta, British Columbia, and Ontario to understand and parameterize the differences in soil amplification between western and eastern Canada. This objective will provide an understanding of earthquake site response across Canada's varied geologic settings.2. Addressing ground motion uncertainty via computational methods: Numerical computations of earthquake rupture within 3D earth models will be performed for region-specific scenario earthquakes in Canada. These computational simulations will address current gaps in recorded earthquake data and quantify the potential range (uncertainty) of earthquake ground shaking.3. Improving current earthquake site response predictor(s): Earthquake ground motion amplitudes at various frequencies (spectra) will be determined from earthquake and field-based seismic measurements as well as computational simulations for typical Canadian geologic settings. Quantitative uncertainty bounds of spectral amplification may then be derived for typical geology in western and eastern Canada to improve our understanding of earthquake site response and its treatment in future building codes.Accurately predicting earthquake ground motion is important for life-safety (engineering design guidelines and codes) and planning (land use management, emergency response, business continuity, insurance rates, etc.) purposes. Hence, the proposed research is important to the earthquake engineering community, as well as to the scientific and emergency management communities.