Site classification using horizontal-to-vertical response spectral ratios and its impact when deriving empirical ground-motion prediction equations

  • Fukushima Y
  • Bonilla L
  • Scotti O
 et al. 
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Abstract

We classify sites based on their predominant period computed using average horizontal-to-vertical (H/V) response spectral ratios and examine the impact of this classification scheme on empirical ground-motion models. One advantage of this classification is that deep geological profiles and high shear-wave velocities are mapped to the resonance frequency of the site. We apply this classification scheme to the database of Fukushima et al. [2003], for which stations were originally classified as simply rock or soil. The calculation of average H/V response spectral ratios permits the majority of sites in the database to be unambiguously classified. Soft soil conditions are clearly apparent using this technique. Ground-motion prediction equations are then computed using this alternative classification scheme. The aleatoric variability of these equations (measured by their standard deviations) is slightly lower than those derived using only soil and rock classes. However, perhaps more impor

Author-supplied keywords

  • Attenuation Relation
  • H/V
  • Predominant Period
  • Response Spectral Ratio
  • Site Classification

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