جستجو در تالارهای گفتگو

An empirical spectral ground-motion model for Iran 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 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. به نقل از گروه تلگرام دستنامه زلزله دانلود از پیوست ghassemi.zare.fokoshima.pdf

On the Selection of Ground-Motion Prediction Equations for Seismic Hazard Analysis Julian J. Bommer, John Douglas, Frank Scherbaum, Fabrice Cotton, Hilmar Bungum, Donat Fäh DOI: 10.1785/gssrl.81.5.783 Published on September 2010, First Published on August 31, 2010 INTRODUCTION A key element in any seismic hazard analysis is the selection of appropriate ground-motion prediction equations (GMPEs). In an earlier paper, focused on the selection and adjustment of ground-motion models for probabilistic seismic hazard analysis (PSHA) in moderately active regions—with limited data and few, if any, indigenous models—Cotton et al. (2006) proposed seven criteria as the basis for selecting GMPEs. Recent experience in applying these criteria, faced with several new GMPEs developed since the Cotton et al. (2006) paper was published and a significantly larger strong-motion database, has led to consideration of how the criteria could be refined and of other conditions that could be included to meet the original objectives of Cotton et al. (2006). In fact, about a dozen new GMPEs are published each year, and this number appears to be increasing. Additionally, Cotton et al. (2006) concluded that the criteria should not be excessively specific, tied to the state-of-the-art in ground-motion modeling at the time of writing and thus remaining static, but rather should be sufficiently flexible to be adaptable to the continuing growth of the global strong-motion database and the continued evolution of GMPEs. The purpose of this paper is to present an update of these criteria, which formed a small section of the Cotton et al. (2006) paper but which are the exclusive focus of this study. The revised and extended list of selection criteria should be of use to those charged with conducting seismic hazard analyses, primarily as a way of avoiding unintended subjectivity in the process of assembling suites of GMPEs to be used in the hazard calculations. At the same time, the suite of criteria—which are actually for excluding GMPEs from a global set rather than selecting in the strict sense—may also be useful as a checklist for those developing new GMPEs. … به نقل از گروه تلگرام دستنامه زلزله دانلود از پیوست 10.1785_gssrl.81.5.783_yhgh.pdf

Introducing a New Approach for Modelling the Near Field Effects in Probabilistic Seismic Hazard Analysis Original Article, D90 Mehri Dehno A., Mahdavi Adeli M. Journal. Civil Eng. Urban. 4(6): 592-598. 2014 ABSTRACT: In definitions of seismic hazard analysis, if the site distance from the fault causing earthquake is short, that site will be considered near fault. The recorded results of previous earthquakes have shown that in such site, the structures show very complex and different behaviour from far field area such that it is required to consider near fault seriously and independently. So far, various studies have been carried out to present a method for reliable modelling of near fault behaviour including the present study. In fact, so far, no reliable and definite method has been proposed for modelling of near field effects in probabilistic seismic hazard analysis and this study aims to take some steps in this area. The present study proposes a new solution based on combined use of both spectral attenuation relations, i.e. spectral attenuation relations with near field effect and spectral attenuation relations lacking near field effects, for calculation of probabilistic seismic hazard analysis. The results of this study indicate the capability of this new idea in modelling of near field effects for reliable estimation of seismic hazard. The results of this study show that the use of attenuation relations of near field, individually, for seismic hazard analysis, increases the spectral acceleration tangibly and unacceptably and is not much reliable. Thus, to overcome this deficiency, one can claim that the best solution for consideration of near field effects is to use the combination of both near and far field attenuation relations according to the proposed model in this study. Keywords: Earthquake, Fault, Near Fault, Probabilistic Seismic Hazard Analysis, Attenuation Relations منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(6)%20592-598,%202014.pdf