Probabilistic Seismic Hazard Assessment ofBabol, Iran

This paper presents a probabilistic seismic hazard assessment of Babol, one of big cities in north of Iran. Many destructive earthquakes happened in Iran in the last centuries. It comes from historical referencesthat at least many times; Babol has been destroyed by catastrophic earthquakes. In this paper, the peakhorizontal ground acceleration over the bedrock (PGA) is calculated by a probabilistic seismic hazard assessment (PSHA). For this reason, at first, a collected catalogue, containing both historical and instrumental events that occurred in a radius of 200 km ofBabol city and covering the period from 874 to 2004 have beengathered. Then, seismic sources are modeled and recurrence relationship is established. After elimination ofthe aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismicparameters (SP) by Kijko method. The calculations were performed using the logic tree method and four weighted attenuation relationships Ghodrati, 0.35, Khademi, 0.25, Ambraseys and Simpson, 0.2 and Sarma and Srbulov, 0.2. Seismic hazard assessment is then carried out for 8 horizontal by 7 vertical lines grid points usingSEISRISK III. Finally, two seismic hazard maps of the studied area based on Peak Horizontal GroundAcceleration (PGA) over bedrock for 2 and 10% probability of exceedance in one life cycles of 50 year are presented. These calculations have been performed by the Poisson distribution of two hazard levels. The results showed that the PGA ranges from 0.32 to 0.33 g for a return period of 475 years and from 0.507 to 0.527 g for a return period of2475 years. Since population is very dense in Babol and vulnerability of buildings is high, the risk of future earthquakes will be very significant