Boore-Atkinson NGA Ground Motion Relations for the Geometric Mean Horizontal Component of Peak and Spectral Ground Motion Parameters, PEER Report 2007-01

This report contains ground motion prediction equations (GMPEs) for a particular measure of horizontal-component ground motions as a function of earthquake mechanism, distance from source to site, local average shear-wave velocity, and fault type. Our equations are for peak ground acceleration (PGA), peak ground velocity (PGV), and 5%-damped pseudo-absolute- acceleration spectra (PSA) at periods between 0.01 s and 10 s. The equations were derived by empirical regression of the PEER NGA strong-motion database. For periods of less than 1 s, the analysis used 1574 records from 58 mainshocks in the distance range from 0 km to 400 km (the number of available data decreased as period increased).

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