Application and Adaptation of Global Ground Motion Models to the Eastern Caribbean Lesser Antilles
Description:
The Eastern Caribbean Lesser Antilles regions experiences seismicity from shallow crustal earthquakes in active tectonic regions, subduction earthquakes (both interface and intraslab), and volcanic zone earthquakes. A regional study by Bozzoni et al. (2011) has formed the basis for probabilistic seismic hazard analyses (PSHA) in recent years. The ground motion models (GMMs) used in those PSHA studies were published between 1997 and 2008, were originally intended for global or regional (Japan) applications, and were not checked or calibrated using data from the Eastern Caribbean region. As a consequence, there is large and unquantified uncertainty associated with the application of those models to the region.
Our work aims to utilize regional data to test more recent global GMMs, from the NGA-West2 and NGA-Subduction projects, against regional data. We specifically aim to evaluate the effectiveness of the GMMs’ source, path, and site relationships for this region. We gathered earthquake catalog data and associated recordings (including recording station properties), processed the ground motions, computed intensity measures (IMs), and developed necessary source, path, and site metadata. We performed mixed effects residuals analyses for shallow crustal events using the Abrahamson et al. (2014), Boore et al. (2014), Campbell and Bozorgnia (2014), and Chiou and Youngs (2014) GMMs and for subduction events using the Kuehn et al. (2020) and Parker et al. (2022) GMMs. The residuals are partitioned into overall bias, event terms, and within-event residuals and examined for trends with source, path, and site terms. Finally, adjustments to the GMM model coefficients and weighting for use in logic trees are recommended for the region.
Session: Recent Advances in Modeling Near-source Ground Motions for Seismic Hazard Applications - II
Type: Oral
Date: 4/16/2025
Presentation Time: 11:30 AM (local time)
Presenting Author: Kenneth
Student Presenter: No
Invited Presentation:
Poster Number:
Authors
Kenneth Hudson Presenting Author Corresponding Author kenneth.s.hudson@gmail.com Hudson Geotechnics, Inc. |
Jose Lockhart j.lockhart@jmlockhart.net Structures & Inspections Engineering, PC |
Martin Hudson marty@hudsongeotechnics.com Hudson Geotechnics, Inc. |
Jonathan Stewart jstewart@seas.ucla.edu University of California, Los Angeles |
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Application and Adaptation of Global Ground Motion Models to the Eastern Caribbean Lesser Antilles
Session
Recent Advances in Modeling Near-source Ground Motions for Seismic Hazard Applications