Implementation of basin models and sediment depth terms in the 2023 update of the U.S. National Seismic Hazard Model: Example from Reno, Nevada

Sean Kamran Ahdi; Morgan P. Moschetti; Brad T. Aagaard; Kaitlyn Abernathy; Oliver S. Boyd; William J. Stephenson

Implementation of basin models and sediment depth terms in the 2023 update of the U.S. National Seismic Hazard Model: Example from Reno, Nevada

By: Sean Kamran Ahdi, Morgan P. Moschetti, Brad T. Aagaard, Kaitlyn Abernathy, Oliver S. Boyd, and William J. Stephenson

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Abstract

We present a framework to evaluate the inclusion of candidate basin depth models in the U.S. Geological Survey National Seismic Hazard Model. We compute intensity measures (peak and spectral amplitudes) from uniformly processed earthquake ground motions in and around the basin of interest and compare these to ground-motion model (GMM) estimates over a range of oscillator periods. The GMMs use depth to specific shear-wave velocity isosurfaces (Z_x) as a proxy for basin depth. We quantify whether the GMM estimates using Z_x from the candidate basin depth model outperform the default estimates based on V_S30 (the time-averaged shear wave velocity in the upper 30 m). We partition GMM residuals into event and site terms and compare site terms for stations within the basin to non-basin sites. We apply this framework to the greater Reno, Nevada, region, which has shallow basin depths (less than 450 m) and empirical amplifications of up to a factor of 2.2 at 1.0 s. There are no strong trends in site terms with basin depth, and the use of Z_x values from the new candidate basin model shows marginal improvement of GMM total residuals compared to the default V_S30-based model (the condition of no relative basin amplification).

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Additional publication details
Publication type	Conference Paper
Publication Subtype	Conference Paper
Title	Implementation of basin models and sediment depth terms in the 2023 update of the U.S. National Seismic Hazard Model: Example from Reno, Nevada
Year Published	2022
Language	English
Publisher	Earthquake Engineering Research Institute
Contributing office(s)	Geologic Hazards Science Center
Description	5 p.
Larger Work Type	Book
Larger Work Subtype	Conference publication
Larger Work Title	Proceedings from the 12th national conference on earthquake engineering
Conference Title	12th National Conference on Earthquake Engineering
Conference Location	Salt Lake City, UT
Conference Date	Jun 27 - Jul 1, 2022
Country	United States
State	Nevada
City	Reno
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