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Spatial sensitivity of seismic hazard results to background seismic activity models

In the probabilistic seismic hazard analysis, the past earthquake records that can not be associated with any one of the specific faults are treated as background seismic activity. Contribution of background seismic activity to seismic hazard is generally calculated by using two different models, namely: background area source with uniform seismicity and spatially smoothed seismicity model. In this study, two case studies are carried out for a large (a country) and a small region (a province) in order to investigate the sensitivity of seismic hazard results to the models used to describe background seismic activity. For this purpose, spatial variation of differences between the seismic hazard values obtained from these two models are mapped and examined for return periods of 475 and 2475 years.