مخاطرات محیط طبیعی (May 2016)
Using probabilistic method to seismic hazard zoning in Sistan and Baluchestan Province
Abstract
In this study Seismic hazard assessment is carried out for 25 – 31.5 ˚E and 58.8 – 63.3 N ˚ including Sistan and Baluchestan province. There are several active faults within this area that many destructive earthquakes occurred along them. At the first we identified these active structures then seismic catalog of period of 1900-2014 and historical earthquake have been investigated. 33 potential seismic sources have been identified. For each seismic sources, seismic parameter estimated. Using these data and choosing convenient attenuation relationship in EZ-FRISK software in a network of dots with the distance of 20 *20 km we obtained peak ground acceleration on bedrock in sites for exceedance probability 10% and life time 50 years for return period of 475 years. The results show Sistan and Baluchestan province is divided to 5 different seismic zones as follow: The area with PGA more than 0.35g that named Very High Seismic Zone and the area with PGA between 0.3 g to 0.35g that named High Seismic Zone includes parts northeast and east of northern part of province and in the middle of Sothern part of province. The area with PGA between 0.25g to 0.3g that named Moderate Seismic Zone, the area with PGA between 0.2g to 0.25g that named Low Seismic Zone and the area with PGA less than 0.2g that named very Low Seismic Zone mainly includes north east and south west parts of province.
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