Results of probabilistic seismic hazard analysis assuming uniform distribution of seismicity

This paper presents results of probabilistic seismic hazard analysis (PSHA) assuming uniform distribution of seismic activity within a broad source zone of area in the order of 106 km2. When predicting ground motions affecting any designated position within the broad source zone, the computation of hazards was simplified further by considering only activities that were within 200 km from any designated position within the source. This simplified approach to modelling is considered to be reasonable for locations where no distinct seismic hot spot has been identified in the surrounding areas. The analyses were based on a range of parameter values characterising earthquake recurrences that are typical of regions of low to moderate seismicity and a list of ground motion models including the five Next Generation Attenuation (primarily for the western United States) (NGA-West2) models. The charts to be presented in the paper can be used for comparison with results from conventional PSHA and for evaluating proposed ground motion models other than the NGA-West2 models. The intention of presenting information in this generalised format is to benchmark results from PSHA and to make the probabilistic analysis process more transparent to the end users and to engineers