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" Site effects in parametric ground motion models for the GEM-PEER Global GMPEs Project "
Stewart, Jonathan P; Seyhan, Emel; Boore, David M; Campbell, Kenneth W; Erdik, Mustafa; Silva, Walter J; Di Alessandro, Carola; Bozorgnia, Yousef
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AL
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| Record Number
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913054
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LA1963r6jf
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| Title & Author
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Site effects in parametric ground motion models for the GEM-PEER Global GMPEs Project [Article]\ Stewart, Jonathan P; Seyhan, Emel; Boore, David M; Campbell, Kenneth W; Erdik, Mustafa; Silva, Walter J; Di Alessandro, Carola; Bozorgnia, Yousef
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2012
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| Title of Periodical
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UCLA
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| Abstract
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We review site parameters used in ground motion prediction equations (GMPEs) for various tectonic regimes and describe procedures for estimation of site parameters in the absence of site-specific data. Most modern GMPEs take as the principal site parameter the average shear wave velocity in the upper 30 m of the site (V<sub>s30</sub>) either directly or as the basis for site classification into categories. Three GMPEs developed for active regions also use basin depth parameters. We review estimation procedures for V<sub>s30</sub> that utilize surface geology, terrain-based site categories, ground slope, or combinations of these. We analyze the relative efficacy of those procedures using a profile data set from California assembled in a recent NGA project. The results indicate that no single procedure is most effective and that prediction dispersion is lower for young sediments than for stiff soils or rock.
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