Probabilistic and Deterministic Seismic Hazard Assessment in Amol Center, a City in North of Iran

In this paper, the peak ground acceleration (PGA) over the bedrock is calculated by a probabilistic and deterministic seismic hazard assessment. An active fault map of the region is prepared. For this purpose, all active faults in a radius of 100 km from Amol city center are recognized and their seismic and rapture parameters are determined. Afterwards, for seismic hazard analysis, the seismic parameters of study region are determined and seismic classification zone is performed. Maximum earthquake, seismic parameters and also occurrence rate are determined. Seismic hazard analysis is performed using 3 different attenuation relationships resulted in seismic hazard curves for Amol city center. The peak ground acceleration (PGA) for design levels MCE, OBE and benefit life structure 50 and 100 years are presented. For the PGA quantity design levels operating base earthquake (OBE), maximum credible earthquake (MCE) for horizontal and vertical dimensions were equal to sequences of 0.33, 0.5 and 0.3, 0.53 g, respectively. INTRODUCTION Seismic Hazard Assessment Iran, one of the most seismic countries of the The methodology for the analysis can be described in world, is situated over the Himalayan-Alpied seismic four steps: belt. In this region faults movements do not have a logic process. In many regions especially in Alborz C Source characterization includes identification and region horizontal movements can be observed along characterization of all earthquake sources which may with the faults; in addition to vertical movements cause significant ground motion in the study area. which are a reason for turbulent deformations. The C Selection of the shortest distance between the devastated types of these sorts of deformations in source and the site of interest. central Alborz region have apparently happened C Selection of controlling earthquake i.e., the after 1990 ManjilRudbar earthquake. This paper earthquake that is expected to produce the strongest presents Probabilistic and deterministic seismic hazard level of shaking. assessment of Amol City center. The study area C Formally define the hazard in terms of ground having the center points as Amol city with latitude motions produced by the controlling earthquake at of 52° 21 N and longitude of 77° 36 E and probabilistic the site. ’ ’ and deterministic seismic hazard assessment. Probabilistic and deterministic approaches to seismic Seismogenic Sources: The seismic tectonic conditions hazard analyses are often demonstrated as diametrically of Amol city center are under the influence of opposed. In fact, they are complementary. For many the Iranian tectonic plate in Middle East region. engineering design purposes they are benefited in The most significant and primary faults in the vicinity combined form. of Amol city center include: Khazar, North Alborz, Deterministic Seismic Hazard Analysis: Iranica Journal of Energy & Environment 3 (3): 259-263, 2012 ISSN 2079-2115 IJEE an Official Peer Reviewed Journal of Babol Noshirvani University of Technology DOI: 10.5829/idosi.ijee.2012.03.03.3004