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J Seismol (2009) 13:499515 DOI 10.1007/s10950-008-9143-x
ORIGINAL ARTICLE
An empirical spectral ground-motion model for Iran
H. Ghasemi M. Zare
Y. Fukushima K. Koketsu
Received: 28 June 2008 / Accepted: 25 September 2008 / Published online: 21 October 2008 Springer Science + Business Media B.V. 2008
Abstract A new ground-motion prediction equation for 5%-damped horizontal spectral acceleration applicable to Iran is presented. On the basis of analysis of variance (ANOVA), selected West-Eurasian records are added to an existing dataset of Iranian accelerometric data to yield a ground-motion prediction equation applicable at wider ranges of magnitude and distance. The advantages of using this model rather than those proposed previously for Iran are discussed by considering the distribution of residuals against the explanatory variables, magnitude and distance. The applicability of the proposed model, as well as those of several other models developed for shallow crustal environments, is also investigated
Electronic supplementary material The online version of this article (doi: http://dx.doi.org/10.1007/s10950-008-9143-x
Web End =10.1007/s10950-008-9143-x ) contains supplementary material, which is availableto authorized users.
H. Ghasemi (B) K. Koketsu
Earthquake Research Institute, University of Tokyo, Tokyo, Japane-mail: [email protected]
H. Ghasemi M. Zare
Engineering Seismology Department, International Institute of Earthquake Engineering and Seismology, Tehran, Iran
Y. FukushimaShimizu Corporation, Tokyo, Japan
by means of statistical tools. The results reveal the overall suitability of the new model as well as the validity of models developed using mainly Eurasian strong-motion records.
Keywords Spectral attenuation relation
Seismic hazard analysis Iran
1 Introduction
The evaluation of seismic hazard in a region of interest requires the use of ground-motion models. These models can be used to describe how a particular ground-motion parameter, such as spectral acceleration, attenuates with distance and varies for earthquakes of different sizes. Given a large number of strong-motion records, region-specic ground-motion models can be developed from empirical observations by regression analysis. However, if in the region of interest, the number of strong-motion records is insufcient to fully represent the desired range of magnitudes and distances, supplementary strong-motion data, recorded in areas with similar tectonic and geological characteristics can be taken into account (e.g., Fukushima et al. 2003).
The Iranian plateau, a part of the large Alpine Himalayan orogenic system, is one of the most seismically active areas in the world, experiencing frequent moderate...