NGA-West2 Equations for Predicting Response Spectral Accelerations for Shallow Crustal Earthquakes.

摘要

We provide ground-motion prediction equations (GMPEs) for the computation of median peak ground motions and response spectra for shallow crustal earthquakes in active tectonic regions. The equations were developed as part of the NGA-West 2 project and are based on a composite data set (Ancheta et al. 2013) that includes global events from 1935 to 2011 spanning a wide magnitude range, plus a large number of small-to-moderate magnitude events from California principally from 1998 to 2011. This data set comprises more than 21,000 records, of which we use a subset of approx. 16000 records in our analysis. The equations follow a philosophy, functional form, and regression method that is similar to the Boore and Atkinson (2008) (BA08) groundmotion model from the original NGA project (i.e., the NGA-West 1 project). That approach, which is continued here, provides for what we refer to as base-case GMPEs accounting for ground motion scaling with magnitude, distance, and site condition.