عنوان

Site effects in parametric ground motion models for the GEM-PEER Global GMPEs Project

LA1963r6jf

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

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_s30) 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_s30 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.

2012

UCLA

[Article]

275578

a

Y