Seismic Hazard Analysis and Obtaining Uniform Hazard Spectra for Esfahan Region, Iran

The present study was conducted to determine peak ground acceleration (PGA) over bedrock in probabilistic analysis methods for the seismic hazard and uniform hazard spectra at different hazard levels for Esfahan city. A series of statistics containing historical and instrumental seismic data covering from the ۸th century A.D. to the now up to a radius of ۲۰۰ km was employed and seismic sources were modeled up to a radius of ۲۰۰ km from Esfahan city. For this purpose the method proposed by Kijko (۲۰۰۰) was employed considering uncertainty in magnitude and incomplete earthquake catalogue. Seismic hazard analysis is then carried out for Esfahan city by using SEISRlSK III (Bender and Perkins, ۱۹۸۷) program for ۱۱×۱۳ grid points. Four different attenuation relationships of PGA and SA with logic tree were used to determine the PGA on bedrock. The PGA can be determined for ۱۴۳ points and the hazard spectra can be specified for ۲۰ points of the city. Covering %۲ and %۱۰ probability of exceedance in one life cycle of ۵۰ years are presented. Finally, the uniform hazard spectra was also presented with %۱۰ and %۲ of probability of exceedance in one life cycles of ۵۰ years are presented along with New Mark and Hall Spectra.

Keywords:

Uniform hazard spectra , Seismic hazard analysis , Seismicity parameters , PGA , Esfahan , Iran