{"id":5630,"date":"2012-03-11T08:17:29","date_gmt":"2012-03-11T08:17:29","guid":{"rendered":"http:\/\/www.iiees.ac.ir\/fa\/?p=5630"},"modified":"2012-03-11T08:17:29","modified_gmt":"2012-03-11T08:17:29","slug":"2012-03-11-08-25-17","status":"publish","type":"post","link":"http:\/\/old.iiees.ac.ir\/fa\/2012-03-11-08-25-17\/","title":{"rendered":"\u0645\u062f\u0644\u200c\u0633\u0627\u0632\u06cc \u0648\u0627\u0642\u0639\u200c\u06af\u0631\u0627\u06cc\u0627\u0646\u0647 \u062c\u0646\u0628\u0634 \u0646\u06cc\u0631\u0648\u0645\u0646\u062f \u0632\u0645\u06cc\u0646 \u0628\u0631\u0627\u06cc \u0634\u0647\u0631\u062a\u0647\u0631\u0627\u0646"},"content":{"rendered":"
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    <\/p>\n

    \u0648\u0627\u0698\u0647<\/strong>\u200c\u0647\u0627\u06cc \u06a9\u0644\u06cc\u062f\u06cc<\/strong>
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    \u200c<\/p>\n

    Modeling of Realistic Ground Motion for Tehran<\/strong><\/div>\n

    Authors: H. Hamzehloo, F.Vaccari, G.F.Panza<\/p>\n<\/p>\n

    Abstract<\/strong><\/p>\n

    A hybrid method for the calculation of realistic synthetic seismograms in laterally heterogenous, anelastic media has been used to model the ground motion in Tehran city. The computation of synthetic seismograms has been carried out by the hybrid method. In this method, synthetic signals are first computed by the modal summation along the bedrock (1D) model, which is defined as a stack of horizontal layers, each characterized by its thickness, longitudinal and transversal wave velocity, density, and Q-factor, controlling the an elastic attenuation. Then, these signals are numerically propagated through the laterally varying local structure by the finite-difference scheme. The resulting signals are used for the seismic micro zoning, using as zoning criteria the “response spectra ratio” (RSR).
    The satisfactory comparison between observed and synthetic waveforms allowed us to propose a possible pattern of amplification of seismic waves along a representative north-south profile in the west part of Tehran. The high amplification in Tehran city clearly indicates that a seismic microzonation map, based on the described methodology, is necessary for sound and sustainable land use planning and for the specifications of building codes and practice to be used by city planners and civil engineers. Our results indicate that this very important preventive planning tool can be readily implemented for Tehran city, which experienced large historical earthquakes in the past, simply by extending the analysis, made so far, in space and to different scenario earthquakes, consistent with the local and regional tectonics. <\/p>\n

    <\/p>\n

    Keywords:<\/strong><\/p>\n

    Realistic ground motion, Site amplification, Tehran<\/p>\n","protected":false},"excerpt":{"rendered":"

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