Enhancement of Very Large Earthquake Modelling Techniques

特大地震模拟技术的增强

• 批准号: RGPIN-2018-05326
• 负责人: Motazedian, Dariush
• 金额: $ 4.37万
• 依托单位: Carleton 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=751166
• 关键词: Enhancement; Very; Large; Earthquake; Modelling

Enhancement of Very Large Earthquake Modelling TechniquesThe seismic design of large or critical structures, such as high-rise buildings, dams, and bridges, typically involves dynamic analysis that uses accelerograms of the expected earthquake motions as input. For most regions, including eastern North America, such accelerograms are often simulated due to a lack of applicable real earthquake recordings of the desired magnitudes and distance ranges. My research team at Carleton University has been studying earthquake fault modelling techniques for 14 years, and we have introduced a technique that has been widely used in seismic ground motion simulations. Our earthquake modelling technique has been requested and used by engineers, seismologists, and graduate students from 28 countries, including Algeria, Australia, Canada, China, Colombia, Costa Rica, Ethiopia, Finland, France, Greece, Iceland, India, Iran, Italy, Japan, Kyrgyzstan, Nepal, New Zealand, Pakistan, the Philippines, Portugal, Romania, Taiwan, Turkey, Spain, Switzerland, and the United States. Our technique generates accelerograms mainly for frequencies from 1.0 Hz to 20 Hz. This range covers the frequency content of earthquakes classified as small to moderate-large, but it does not cover very large earthquakes. The main objective of this study is to include the lower frequencies (0.1 Hz to 1.0 Hz) in our earthquake modelling technique. The enhanced modelling technique combines low frequency techniques (finite difference, finite element, and finite spectral methods) with our successful high frequency stochastic modelling technique. The proposed research will increase our ability to model very large earthquakes for the seismic design of engineered structures in Canada and other countries. Our research results will be offered as a free-of-charge and user-ready program to simulate very large earthquakes as required for a variety of applications.

大型地震模型技术的改进大型或关键结构的抗震设计，如高层建筑、大坝和桥梁，通常涉及使用预期地震运动的加速度图作为输入的动力分析。对于包括北美东部在内的大多数地区，由于缺乏所需震级和距离范围的可用真实地震记录，通常会模拟这样的加速度图。我在卡尔顿大学的研究团队已经研究地震断层建模技术14年了，我们引入了一种广泛应用于地震地面运动模拟的技术。我们的地震建模技术已被来自28个国家的工程师、地震学家和研究生要求和使用，这些国家包括阿尔及利亚、澳大利亚、加拿大、中国、哥伦比亚、哥斯达黎加、埃塞俄比亚、芬兰、法国、希腊、冰岛、印度、伊朗、意大利、日本、吉尔吉斯斯坦、尼泊尔、新西兰、巴基斯坦、菲律宾、葡萄牙、罗马尼亚、台湾、土耳其、西班牙、瑞士和美国。我们的技术主要针对1.0赫兹到20赫兹的频率生成加速度图。这一范围涵盖了被归类为小到中-大地震的频率内容，但不包括非常大的地震。这项研究的主要目标是将较低的频率(0.1赫兹到1.0赫兹)纳入我们的地震模拟技术。改进的建模技术将低频技术(有限差分、有限元和有限谱方法)与我们成功的高频随机建模技术结合在一起。这项拟议的研究将提高我们为加拿大和其他国家的工程结构的抗震设计模拟非常大的地震的能力。我们的研究成果将以免费和用户就绪的程序形式提供，以模拟各种应用所需的超大型地震。