Seismic Hazard Assessment of Bandar Abbas for Seismic Retrofitting

This paper presents a seismic hazard assessment of Bandar Abbas in southern of Iran. Four maps have been prepared to indicate the earthquake hazard of this region and its vicinity in the form of iso-acceleration contour lines. They display the probabilistic estimate of Peak Ground Horizontal Acceleration (PGHA) over bedrock for the return periods of 75, 225, 475 and 2475 years, which is the most common criterion in designing and retrofitting of buildings. This region is located at the edge where the Arabian plate pushes forward towards Iran plateau. Southern part of Iran plays an important role in economy of Iran. In this study, seismicity parameters are calculated based on a catalogue of both historical and instrumental earthquakes over an area of 200 km radius around the Bandar Abbas, by Kijko. In order to determine the PGHA, four different attenuation relationships have been used and mixed by using logic tree method. Finally seismic hazard analysis has been performed for region, by SEISRISK III for four hazard levels.