Support for Peak Ground Velocity in the US Geological Survey National Seismic Hazard Model
Publication: Lifelines 2022
ABSTRACT
The U.S. Geologic Survey (USGS) routinely updates the National Seismic Hazard Model (NSHM) for the United States and its territories. The NSHM has historically supported calculation of probabilistic seismic hazard for pseudo-spectral accelerations at three periods (0, 0.2, and 1 s) and one reference site condition (a time-averaged 30-m shear-wave velocity of VS30 = 760 m/s) as required for the design ground motion maps of the National Earthquake Hazards Reduction Program (NEHRP) Recommended Seismic Provisions for New Buildings and Other Structures and other building-code documents. With the recent 2018 update, the NSHM expanded support in the conterminous United States to 22 spectral periods and 8 site conditions ranging from VS30 = 1,500 m/s (Site Class A) to VS30 = 150 m/s (Site Class E), as required by the 2020 NEHRP Provisions. Expanding support to more periods and site conditions was made possible largely by adoption of the Next Generation Attenuation project, NGA-East, ground motion models (GMMs) for the stable craton of the central and eastern United States. The USGS is now expanding support to additional intensity measure types. Here, we present the incorporation of peak ground velocity (PGV) in the NSHM. The NGA-East models include PGV, as do many GMMs used to estimate earthquake ground motions in the active crust and subduction zone tectonic environments of the western United States. For those GMMs considered in the NSHM that do not natively support PGV, we use a newly developed conditional model to estimate PGV given values of pseudo-spectral acceleration (PSA). Unlike prior models that are conditioned on a single spectral period, the period used in the new model is magnitude dependent. The model introduces a parameter TPGV, which refers to the spectral period with the highest correlation between PSA and PGV at the given magnitude. This feature captures the magnitude scaling observed in the corner frequency of the earthquake source and also leads to an improved model of aleatory variability. The model is derived from observations in active tectonic regions, and we explore its application to other tectonic environments.
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Lifelines 2022
Pages: 144 - 151
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Published online: Nov 16, 2022
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