Uniform Hazard spectra for the Iranian city of Shiraz

In this study, uniform hazard spectra assessment is performed for the city of Shiraz and eight graphs are prepared to indicate the probabilistic estimate of spectral ordinates over bedrock in this area. For this assessment; first, earthquake catalogue and main active faults in a radius of 200 km are gathered and processed and then seismicity parameters are obtained by Kijko and Tavakoli methods, after that the results are introduced to the computer program of seismic hazard analysis SEISRISK III by three attenuation relationships and eventually the outputs are combined by logic tree method. The isospectrums are calculated in two levels of hazard in four soil types which are needed for retrofit of building in Seismic Rehabilitation Code for Existing Buildings in Iran. The Results show that the recommended SA and what is achieved in this study for the return periods of 475 and 2475 years, are same together in maximum and mean amounts, respectively.