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Scenario dependence of linear site-effect factors for short-period response spectral ordinates

Peter J. Stafford, Adrian Rodriguez-Marek, Benjamin Edwards, Pauline P. Kruiver and Julian J. Bommer
Scenario dependence of linear site-effect factors for short-period response spectral ordinates
Bulletin of the Seismological Society of America (December 2017) 107 (6): 2859-2872

Abstract

Ground-motion models for response spectral ordinates commonly partition site-response effects into linear and nonlinear components. The nonlinear components depend upon the earthquake scenario being considered implicitly through the use of the expected level of excitation at some reference horizon. The linear components are always assumed to be independent of the earthquake scenario. This article presents empirical and numerical evidence as well as a theoretical explanation for why the linear component of site response depends upon the magnitude and distance of the earthquake scenario. Although the impact is most pronounced for small-magnitude scenarios, the finding has significant implications for a number of applications of more general interest including the development of site-response terms within ground-motion models, the estimation of ground-motion variability components Phi S2S and Phi SS, the construction of partially nonergodic models for site-specific hazard assessments, and the validity of the convolution approach for computing surface hazard curves from those at a reference horizon, among others. All of these implications are discussed in the present article.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 107
Serial Issue: 6
Title: Scenario dependence of linear site-effect factors for short-period response spectral ordinates
Affiliation: Imperial College London, Department of Civil and Environmental Engineering, London, United Kingdom
Pages: 2859-2872
Published: 201712
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 32
Accession Number: 2018-031671
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Virginia Polytechnic Institute and State University, USA, United StatesUniversity of Liverpool, GBR, United KingdomDeltares, NLD, Netherlands
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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