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Structural Engineering and Mechanics Volume 32, Number 4, July10 2009 , pages 563-581 DOI: https://doi.org/10.12989/sem.2009.32.4.563 |
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Probabilistic seismic hazard assessment of Sanandaj,Iran |
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Gholamreza Ghodrati Amiri, Kaveh Andisheh and Seyed Ali Razavian Amrei
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| Abstract | ||
| In this paper, the peak horizontal ground acceleration over the bedrock (PGA) is calculated by a probabilistic seismic hazard assessment (PSHA). For this reason, at first, all the occurred earthquakes in a radius of 200 km of Sanandaj city have been gathered. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters (SP) by Kijko (2000) method. The seismotectonic model of the considered region and the seismic sources of the region have been modeled. In this research, Sanandaj and its vicinity has been meshed as an 8 (vertical lines) * 10 (horizontal lines) and the PGA is calculated for each point of the mesh using the logic tree method and the five attenuation relationships (AR) with different weighted coefficient. These calculations have been performed by the Poisson distribution of four hazard levels. Then by using it, four regional maps of the seismic hazard regions have been provided for Sanandaj and its vicinity. The results show that the maximum and minimum value of PGA for the return periods of 75, 225, 475, 2475 years are (0.114, 0.074) (0.157, 0.101), (0.189, 0.121) and (0.266, 0.170), respectively. | ||
| Key Words | ||
| probabilistic seismic hazard assessment; seismicity parameters; peak ground acceleration; Sanandaj, Iran. | ||
| Address | ||
| Gholamreza Ghodrati Amiri: Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran University of Science & Technolog, Tehran, Iran Kaveh Andisheh: Dept. of Civil Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran Seyed Ali Razavian Amrei: School of Civil Engineering, Iran University of Science & Technology, Tehran, Iran | ||