Department of Civil Engineering, Islamic Azad University, Germi, Iran
Department of Civil Engineering, Payame Noor University, Tehran, Iran
Golsar is located in north-west of Rasht the capital city of Guilan province. This region, according to standards 2800, is identified among the regions with relatively high risk of earthquake. A set of historical and instrumental seismicity data used in radius of 200 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 10% in 50 years, is 0.31g 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 0.3 second period has the highest value for 2% and 10% probability of occurrence. The earthquake hazard in Golsar zone was calculated using SEISRISK III (1987) software.