As part of the Next Generation Attenuation Relationships for Central and Eastern North America (NGA-East) Project, we have gathered data to define an appropriate reference-rock site condition for CENA. The reference-rock site condition is defined by the S- and P-wave velocities, as well as the local crustal damping (K0). This report deals solely with the definition of the reference P- and S-wave velocities. The significance of the reference-rock definition is that it represents the site condition for which ground motions will be predicted using semi-empirical ground motion prediction equations (GMPEs). Moreover, it represents the site condition to which site significant differences in the reference-rock site conditions between active tectonic regions, such as Western North America (WNA), and mid-plate regions, such as Central and Eastern North America (CENA).
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