Abstract Near-surface soil conditions can significantly alter the amplitude and frequency content of incoming ground motions – often with profound consequences for the built environment – and are thus important inputs to any ground-motion prediction. Previous soil-velocity models (SVM) have predicted shear-wave velocity profiles based on the time-averaged shear-wave velocity in the upper 30 m (VS30). This article presents a generic soil-velocity model that accounts both for near-surface conditions (VS30) and deeper geologic structure, as represented to the depth at which the profile reaches a velocity of 1.0 km/s (Z1.0). To demonstrate the advantages of our new SVM, we apply it to the Cascadia Region of North America, where numerous geologic basins and glaciated landscapes give rise to a wide range of VS30 and Z1.0 combinations. This soil velocity model yields good estimates of site response across all site conditions, and significantly improves upon a model calibrated using only VS30 data. In conjunction with existing models that describe the deep velocity structure of the region (e.g., (Stephenson et al., 2017) [27]; the proposed model is particularly suited for use in regional-scale predictions of site response, liquefaction, landslides, infrastructure damage, and loss. The proposed methodology is broadly applicable to the development of SVMs elsewhere, and with improved understanding of near-surface and deep velocity structures, can facilitate more accurate ground-motion predictions globally.

中文翻译：

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考虑近地表条件和更深地质结构的通用土壤速度模型

摘要 近地表土壤条件可以显着改变传入地面运动的幅度和频率内容 - 通常会对建筑环境产生深远的影响 - 因此是任何地面运动预测的重要输入。以前的土壤速度模型 (SVM) 已经根据上层 30 m (VS30) 的时间平均剪切波速度预测了剪切波速度剖面。本文提出了一个通用的土壤速度模型，该模型考虑了近地表条件 (VS30) 和更深的地质结构，以剖面达到 1.0 km/s (Z1.0) 的速度时的深度表示。为了展示我们新的 SVM 的优势，我们将其应用于北美的卡斯卡迪亚地区，在那里众多的地质盆地和冰川景观产生了广泛的 VS30 和 Z1.0 组合。该土壤速度模型可以很好地估计所有场地条件下的场地响应，并显着改进仅使用 VS30 数据校准的模型。结合描述该地区深层速度结构的现有模型（例如，（Stephenson 等人，2017 年）[27]；所提出的模型特别适用于场地响应、液化、滑坡、基础设施损坏和损失。所提出的方法广泛适用于其他地方的 SVM 的开发，并且随着对近地表和深部速度结构的更好理解，可以促进更准确的全球地面运动预测。