Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2007.3368.3380Ghodrati AmiriGholamrezaAli Razavian AmreiSeyedMotamedRaminGanjaviBehnoud122007722In this study, probabilistic evaluation of seismic hazard
in metropolitan Tehran, capital of Iran, is presented. The present study
has been done in north part of Tehran due to the existence of high-rise
buildings, important structures and the flourishing of high-rise building
constructions in this zone. The objective of this study was the preparation
of spectral acceleration maps with different seismic hazard levels for
some specific periods. A set of historical and instrumentally recorded
seismic data have been employed covering the timeline from 4 centuries
BC up to 2003 and the seismic sources were modeled in a radius of 200
km around Tehran. The calculations for horizontal motion were carried
out using two weighted horizontal attenuation relationships; using Logic
Tree method. The calculations for vertical motion were carried out. Probabilistic
seismic hazard evaluation was performed on a grid of 16x9 points in north
part of Tehran using SEISRISK III. The corresponding results have been
depicted by horizontal spectral acceleration maps with 2 and 10% PE (Probability
of Exceedence) in 50 years and by vertical spectral acceleration maps
with 10% PE in 50 years. The results show that whenever soil type changes
from rocky to stiff, there is an increase in the spectral acceleration
in that region. However in eastern north parts of Tehran, due to approaching
to the north Tehran faults and also being situated over small or large
faults of the region, there will be higher spectral accelerations than
other points.]]>Ambraseys, N.N. and C.P. Melville, 1982Ambraseys, N.N. and K.A. Simpson,1996Ambraseys, N.N., K.A. Simpson and J.J. Bommer,1996Bender, B. and D.M. Perkins, 1987Berberian, M., M. Ghoreishi, B.A. Ravesh and A.M. Ashjaei,1983Berge-Thierry, C., F. Cotton, O. Scotti, D. Anne, G. Pommera and Y. Fukushima,2003Gardner, J.K. and L. Knopoff, 1974Amiri, G.G., R. Motamed and H.R. Es-Haghi, 2003Gutenberg, B. and C.F. Richter, 1954IIEES, 2002IRCOLD, 1994Iranian Code of Practice for Seismic Resistance Design of Building,2005Jafari, M.,2002Kijko, A., 2000Nabavi, S.M.,1978Nowroozi, A., 1985