Uniform Hazard Spectra and Simulated Strong Ground Motion for Bam, Iran

Abstract eng:
The Bam earthquake of 26 December 2003(Mw6.5) occurred near the city of Bam in the southeast of Iran. 1) We have used M<5.0 aftershocks that occurred throughout the area which recorded by Building House Research Center strong ground motion network & have simulated strong-ground-motion using empirical green function method. For this, we generated 10 models for Bam fault. 2) We have estimated Uniform hazard spectra based on seismotectonics and seismicity of the Bam regions. The controlling magnitude for return period of 475 and 2475 years have been estimated based on deggregation of hazard. 3) The comparisons were based on the pseudo-acceleration spectra (PSA) in Bam station. The comparison between estimated uniform hazard response spectra (UHRS) and simulated response spectra shows that UHRS estimate less value of spectra at longer periods. This is very important for sites closed to fault as the case of Bam station, which is already at very close distance to Bam fault compare to other stations. The second important point is related to the selection of simulation method. The results of simulation indicate we need more detail information regarding to seismological parameters, site geology and attenuations in Bam region.

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