Multi-Resolution Basin Terms for Ground Motion Models in Central and Eastern North America
Description:
Current ground motion models (GMMs) in Central and Eastern North America (CENA) rely on the time-averaged shear-wave velocity in the upper 30 m of the site (VS30) as the primary site variable. Prior to recent publications (Boyd et al., 2023), sediment thickness and basin terms have not been consistently available in CENA. In recent years, CENA has seen an increase in the volume and resolution of ground motion datasets including recently published datasets like the Central and Eastern U.S. Earthquake Ground Motion Database: 2010 to 2020 (Thompson et al. 2023) which builds on previously published ground motion data such as NGA-East (Goulet et al, 2014). At the same time, new geologic, and geotechnical datasets such as and the Atlantic and Gulf Coastal Plains Sediment Thickness model (Boyd et al., 2023) and the UCLA Shear-wave Velocity Database (Kwak et al., 2021) have also been developed. The goal of this work is to integrate these datasets along with additional geospatial datasets to define a set of multi-resolution basin and site effect terms for use in CENA for ground motion modeling. By integrating these datasets, as well as other geospatial variables including basin geomorphology and geology, we gain a better understanding of path and site effects in CENA, with a specific focus on observed and simulated basin amplification of long-period ground motions (T > 1 s). The proposed multi-resolution basin terms combine surficial geology, geomorphologic basin classifications, sediment thickness data, hydrologic data, and geotechnical data, to create a spatially continuous basin term for use in GMMS in CENA. Linear mixed-effects regression will be used to decompose GMM residuals to investigate complex basin, site, region, and geology effects in CENA using the dataset, with a goal of reducing epistemic uncertainty in future CENA ground motion prediction.
Session: From Earthquake Recordings to Empirical Ground-Motion Modelling [Poster Session]
Type: Poster
Date: 5/2/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Elise
Student Presenter: Yes
Invited Presentation:
Authors
Elise Meyer Presenting Author Corresponding Author elise.meyer@tufts.edu Tufts University |
Arden Dioslaki dioslakia@merrimack.edu Merrimack College |
Shiying Nie shiying.nie@tufts.edu Tufts University |
Weiwei Zhan weiwei.zhan@ucf.edu University of Central Florida |
James Kaklamanos KaklamanosJ@merrimack.edu Merrimack College |
Laurie Baise Laurie.Baise@tufts.edu Tufts University |
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Multi-Resolution Basin Terms for Ground Motion Models in Central and Eastern North America
Category
From Earthquake Recordings to Empirical Ground-Motion Modelling