Abstract: Reasonable ground motion parameters are a prerequisite for seismic hazard analysis of high dams. This study investigates scenario earthquakes and the corresponding site-related response spectra for the Xiluodu dam, based on the Code for seismic design of hydraulic structures of hydropower project (NB 35047—2015) with category A of seismic protection. First, the Yongshan area with the largest contribution to the exceedance probability of this dam is selected as a potential seismic area for earthquakes; then, the magnitude and epicenter distance of the scenario earthquakes are determined by the principle of the maximum occurrence probability. Finally, the site-related response spectrum is generated using the ground-motion prediction equation AS08. This study gives a basis for seismic analysis of the Xiluodu dam based on real dynamic working state, and helps seismic analysis of similar projects.

Key words: earthquake engineering, scenario earthquake, site-related response spectrum, ground-motion attenuation relationship, Xiluodu arch dam