Enhancement of Very Large Earthquake Modelling Techniques

大型或关键结构（如高层建筑、水坝和桥梁）的抗震设计通常涉及使用预期地震运动的加速度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适用的真实地震记录，这种加速度通常是模拟的。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，我们已经引入了一种广泛应用于地震地面运动模拟的技术。我们的地震模拟技术已被来自28个国家的工程师、地震学家和研究生要求和使用，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。我们的技术主要产生1.0 Hz到20 Hz频率的加速度图。这个范围涵盖了小地震到中大地震的频率内容，但不包括特大地震。本研究的主要目的是在我们的地震模拟技术中包括较低频率（0.1 Hz至1.0 Hz）。增强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相结合。拟议的研究将提高我们在加拿大和其他国家的工程结构抗震设计中模拟特大地震的能力。我们的研究成果将作为一个免费的用户准备程序提供，以模拟各种应用所需的非常大的地震。

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.