What does this research mean for the field?

The CPVMv2.0 suite of regional seismic velocity models provides a validated framework for characterizing shear wave velocity structure and its associated epistemic and aleatory uncertainties across the U.S. Atlantic and Gulf Coastal Plains. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Develop an updated suite of regional seismic velocity models (CPVMv2.0) that integrates subsurface geology and explicitly accounts for aleatory variability and epistemic uncertainty across the U.S. Atlantic and Gulf Coastal Plains.

August 25, 2026Earthquake SpectraOpen Access

Suite of Regional Seismic Velocity Models for the U.S. Atlantic and Gulf Coastal Plains (CPVMv2.0): Incorporating Epistemic Uncertainty in Velocity Models

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Authors

CGCassie Gann‐PhillipsNorth Carolina State University ACAshly CabasUnited States Geological Survey CJChunyang JiChina Electronic Product Reliability and Environmental Test Institute

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Implication

Geophysical modeling study demonstrates updated seismic velocity frameworks for the US Coastal Plains, enhancing regional physics-based ground-motion simulations.

Key Points

Develop an updated suite of regional seismic velocity models (CPVMv2.0) that integrates subsurface geology and explicitly accounts for aleatory variability and epistemic uncertainty across the U.S. Atlantic and Gulf Coastal Plains.
Analyzed 750 measured shear wave velocity (VS) profiles classified into nine surficial-geologic-age and geographic groups.
Generated six subsurface median velocity profiles using depth-dependent stratigraphic boundaries from the USGS National Crustal Model.
Validated the velocity model suite against measured and estimated fundamental resonant frequencies and regional velocity datasets.
Successfully quantified aleatory variability across sediment layers, weathered rock, bedrock velocity, and interface depths.
Produced alternative profile suites that systematically capture epistemic uncertainty across kilometers-thick sediment deposits.
Established regional velocity constraints to calibrate VS30 profiles, sediment thickness interfaces, and physics-based ground-motion simulations.

Cite This Study

Gann‐Phillips et al. (2026) studied this question.

synapsesocial.com/papers/6a8d4a26e8bd2413309bc117 https://doi.org/10.1002/esp4.70114

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Implication

Geophysical modeling study demonstrates updated seismic velocity frameworks for the US Coastal Plains, enhancing regional physics-based ground-motion simulations.

Suite of Regional Seismic Velocity Models for the U.S. Atlantic and Gulf Coastal Plains (CPVMv2.0): Incorporating Epistemic Uncertainty in Velocity Models

Discussion

Member takes

Implication

Key Points

Cite This Study

Suite of Regional Seismic Velocity Models for the U.S. Atlantic and Gulf Coastal Plains (CPVMv2.0): Incorporating Epistemic Uncertainty in Velocity Models

Discussion

Member takes

Implication

Key Points

Cite This Study

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