Seismic Hazard Analysis of Golsar district in Rasht Metropolis

Golsar is located in north-west of Rasht the capital city of Guilan province. This region, according to standards ۲۸۰۰, is identified among the regions with relatively high risk of earthquake. A set of historical and instrumental seismicity data used in radius of ۲۰۰ km which covers the period twelveth century until now. Kijko method has been applied for estimating for parameters considering of the available information. Estimating the peak ground acceleration on Bedrock (PGA) with five different attenuation relationship, with a probability of occurrence of ۱۰% in ۵۰ years, is ۰.۳۱g in Galsar Rasht region. Meanwhile in order to determine the seismic spectra based on weighed attenuation spectral relations, and also for the reason of being spectral and more suitable with the condition of the zone were used. The horizontal spectral acceleration in the ۰.۳ second period has the highest value for ۲% and ۱۰% probability of occurrence. The earthquake hazard in Golsar zone was calculated using SEISRISK III (۱۹۸۷) software.

Keywords:

Seismic hazard analysis , Peak ground acceleration (PGA) , Uniform seismic hazard spectra (UHS) , Attenuation relationships