USGS 2025 Puerto Rico and the U.S. Virgin Islands NSHM Update
Description:
The U.S. Geological Survey’s National Seismic Hazard Model Project plans to begin the next update of the National Seismic Hazard Model (NSHM) for Puerto Rico and the U.S. Virgin Islands (PRVI) in 2023, with a planned release of the updated NSHM by the end of 2025. The last update to the PRVI NSHM was in 2003. Therefore, the new update will include over 20-years of new science and engineering data, models, and methods. Some of the updates being considered are (1) an updated seismicity catalog based on improved Puerto Rico Seismic Network data, (2) new declustering (space and time and nearest neighbor), smoothing (fixed and adaptive), and seismicity rate models, (3) new magnitude scaling relationships, (4) updated geologic and geodetic deformation models, (5) improved modeling of subduction zone geometries using Slab2.0, (6) evaluation and implementation of ground motion models for both crustal (NGA-West2 and other available Puerto Rico-specific models) and subduction (NGA-Subduction) sources, and (7) comparison of NGA site amplifications to observed amplifications in Puerto Rico. These updates parallel efforts made in other recent NSHMs (e.g., 2021 Hawaii NSHM and 2023 conterminous U.S. and Alaska NSHMs). Uncertainty and engineering impact studies will also be performed for this update. Development and finalization of input models will occur in 2023, followed by implementation of the draft model in early 2024. NSHMs are community- and consensus-based models, with the goal to incorporate the latest data, models, and methods currently available. At least two public workshops, one in 2023 and another in 2024, will allow the scientific community to evaluate the input models and draft model, providing valuable input as the model is developed and finalized.
Session: 2025 Puerto Rico and the U.S. Virgin Islands National Seismic Hazard Model Update
Type: Oral
Date: 4/18/2023
Presentation Time: 04:30 PM (local time)
Presenting Author: Allison M. Shumway
Student Presenter: No
Invited Presentation:
Authors
Allison Shumway Presenting Author Corresponding Author ashumway@usgs.gov U.S. Geological Survey |
Edward Field field@usgs.gov U.S. Geological Survey |
Morgan Moschetti mmoschetti@usgs.gov U.S. Geological Survey |
Kishor Jaiswal kjaiswal@usgs.gov U.S. Geological Survey |
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USGS 2025 Puerto Rico and the U.S. Virgin Islands NSHM Update
Category
2025 Puerto Rico and the U.S. Virgin Islands National Seismic Hazard Model Update