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    • Keywords


      Microtremor; damping ratio; natural frequency; Mashhad city; 1D equivalent linear.

    • Abstract


      Microtremor survey is achieved in order to evaluate the dynamical characteristics of surface layers. For this purpose, 13 trenches were selected and microtremor measurements were performed at the top and bottom of each trench. Floor spectral ratio (FRS) analysis was accomplished to obtain frequency and amplification of the trenches. The results of microtremor were compared with 1D equivalent linear analysis. Most of the fundamental frequencies obtained by 1D analysis are in good agreement with those calculated by microtremor technique. Irregularities in surface and subsurface geomorphic conditions tend to have differences in results obtained by both mentioned methods. Damping ratios were derived from the half power bandwidth method. The damping ratio varied between 2.1 in fine grain soils and 6.6 in sand soils.

    • Author Affiliations


      Azam Ghazi1 Naser Hafezi Moghadas1 Hossein Sadeghi1 Mohammad Ghafoori1 Gholam Reza Lashkaripour1

      1. Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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