Site-Specific Probabilistic Seismic Hazard Assessment for a site in East Auckland

This paper presents a comparison of different methods to determine the seismic hazard for a site in East Auckland. A probabilistic seismic hazard assessment was used to evaluate the seismic hazard at bedrock and the ground surface, while a one-dimensional site response analysis determines the hazard at the ground surface. Seismic hazard results at bedrock and the ground surface are compared to their codified counterpart. The site-specific results (PSHA and SRA), and associated uncertainty, provide an indication of the expected range of responses at the site. Comparison of methods highlights the influence of subsurface soils on the ground motion response and the importance in considering the wider context when adopting seismic design loads.