Accurate understanding and quantification of the risk to critical infrastructure posed by future large earthquakes continues to be a very challenging problem. Earthquake phenomena are quite complex and traditional approaches to predicting ground motions for future earthquake events have historically been empirically based whereby measured ground motion data from historical earthquakes are homogenized into a common data set and the ground motions for future postulated earthquakes are probabilistically derived based on the historical observations. This procedure has recognized significant limitations, principally due to the fact that earthquake ground motions tend to be dictated by the particular earthquake fault rupture and geologic conditions at a given site and are thus very site-specific. Historical earthquakes recorded at different locations are often only marginally representative. There has been strong and increasing interest in utilizing large-scale, physics-based regional simulations to advance the ability to accurately predict ground motions and associated infrastructure response. However, the computational requirements for simulations at frequencies of engineering interest have proven a major barrier to employing regional scale simulations. In a U.S. Department of Energy Exascale Computing Initiative project, the EQSIM application development is underway to create a framework for fault-to-structure simulations. This framework is being prepared to exploit emerging exascale platforms in order to overcome computational limitations. This article presents the essential methodology and computational workflow employed in EQSIM to couple regional-scale geophysics models with local soil-structure models to achieve a fully integrated, complete fault-to-structure simulation framework. The computational workflow, accuracy and performance of the coupling methodology are illustrated through example fault-to-structure simulations.

准确理解和量化未来大地震对关键基础设施构成的风险仍然是一个非常具有挑战性的问题。地震现象非常复杂，传统上以经验为基础来预测未来地震事件的地震动的方法是基于经验的，从而将来自历史地震的实测地震动数据均化为一个通用数据集，并根据该概率概率推导未来假定地震的地震动。历史观察。该程序已认识到很大的局限性，主要是由于这样的事实，即地震地震动往往是由给定地点的特定地震断层破裂和地质条件所决定的，因此是针对特定地点的。在不同地点记录的历史地震通常仅具有代表性。利用大型，基于物理学的区域模拟来提高准确预测地面运动和相关基础设施响应的能力已经引起了越来越高的兴趣。但是，在工程感兴趣的频率下进行仿真的计算要求已被证明是采用区域规模仿真的主要障碍。在美国能源部百亿分之一计算倡议计划的项目中，EQSIM应用程序开发正在进行中，以创建一个从结构到结构的仿真框架。为了克服计算上的限制，正在准备利用此框架来开发新兴的亿亿级平台。本文介绍了EQSIM中使用的基本方法论和计算工作流程，以将区域规模的地球物理模型与本地土壤结构模型耦合在一起，以实现完全集成的，完整的断层到结构的模拟框架。通过示例故障-结构仿真说明了耦合方法的计算流程，准确性和性能。