Parametric modeling of shear wave velocity profiles for the conterminous U.S

• URL: http://arxiv.org/abs/2510.00372v1
• Date: Wed, 01 Oct 2025 00:37:17 GMT
• Title: Parametric modeling of shear wave velocity profiles for the conterminous U.S
• Authors: Morgan D. Sanger, Brett W. Maurer,
• Abstract summary: This study defines a functional form to describe VS-with-depth across the conterminous U.S.<n>We calibrate the parameters of the function using a national compilation of more than 9,000 in-situ geotechnical measurements.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Earthquake ground motions and the related damage can be significantly impacted by near-surface soils. Accurate predictions of seismic hazard require depth-continuous models of soil stiffness, commonly described in terms of shear-wave velocity (VS). For regional-scale studies, efforts to predict VS remotely, such as the U.S. Geological Survey's National Crustal Model, tend to emphasize deeper lithologic velocity structures, thus simplifying important near-surface soil velocity variations, and tend to be produced at relatively coarse geospatial resolution for one geographic area. In this study, we define a functional form to describe VS-with-depth across the conterminous U.S. We calibrate the parameters of the function using a national compilation of more than 9,000 in-situ geotechnical measurements. By coupling the parametric framework with geospatial machine learning, the model can be leveraged to provide consistent, high resolution VS-depth predictions of the near-surface geotechnical layer across the U.S., complementing the National Crustal Model and supporting applications such as physics-based ground motion simulations and coseismic hazard assessments.

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