Previous-generation ground-motion attenuation relations (e.g., Abrahamson and Silva 1997; Boore et al. 1997; Campbell 1997; Sadigh et al. 1997) were designed to predict ground motion at distances less than 100 km from an earthquake fault. As probabilistic and deterministic seismic hazard analysis concepts have become more prevalent in performance-based seismic design, these relations have been used in practice much beyond their distance limitation. Realizing the engineering needs for predicting ground motions at distances farther than 100 km, the Next Generation Attenuation (NGA) relations project targeted a distance range up to 200 km (Power...

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