Estimating unknown input parameters when implementing the NGA ground-motion prediction equations in engineering practice

Earthquake Spectra
By: , and 

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Abstract

The ground-motion prediction equations (GMPEs) developed as part of the Next Generation Attenuation of Ground Motions (NGA-West) project in 2008 are becoming widely used in seismic hazard analyses. However, these new models are considerably more complicated than previous GMPEs, and they require several more input parameters. When employing the NGA models, users routinely face situations in which some of the required input parameters are unknown. In this paper, we present a framework for estimating the unknown source, path, and site parameters when implementing the NGA models in engineering practice, and we derive geometrically-based equations relating the three distance measures found in the NGA models. Our intent is for the content of this paper not only to make the NGA models more accessible, but also to help with the implementation of other present or future GMPEs.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Estimating unknown input parameters when implementing the NGA ground-motion prediction equations in engineering practice
Series title Earthquake Spectra
DOI 10.1193/1.3650372
Volume 27
Issue 4
Year Published 2011
Language English
Publisher EERI
Publisher location Oakland, CA
Contributing office(s) Earthquake Science Center
Description 17 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Earthquake Spectra
First page 1219
Last page 1235