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

Yoshimitsu Fukushima, Luis Fabián Bonilla, Oona Scotti, John Douglas

Research output: Contribution to journalArticle

33 Citations (Scopus)

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 importantly, predicted response spectra are radically different to those predicted using the soil/rock classification. In addition, since the H/V response spectral ratios were used to classify stations the predicted spectra for different sites show clear separation. Thus, site classification using the predominant period appears to be partially mapped into the site coefficients of the ground-motion model.

LanguageEnglish
Pages712-724
Number of pages13
JournalJournal of Earthquake Engineering
Volume11
Issue number5
Early online date14 Aug 2007
DOIs
Publication statusPublished - Sep 2007

Fingerprint

ground motion
prediction
Soils
Rocks
rock
soil
Shear waves
soft soil
wave velocity
S-wave
station

Keywords

  • attenuation relation
  • H/V
  • predominant period
  • response spectral ratio
  • site classification

Cite this

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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 importantly, predicted response spectra are radically different to those predicted using the soil/rock classification. In addition, since the H/V response spectral ratios were used to classify stations the predicted spectra for different sites show clear separation. Thus, site classification using the predominant period appears to be partially mapped into the site coefficients of the ground-motion model.",
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Site classification using horizontal-to-vertical response spectral ratios and its impact when deriving empirical ground-motion prediction equations. / Fukushima, Yoshimitsu; Bonilla, Luis Fabián; Scotti, Oona; Douglas, John.

In: Journal of Earthquake Engineering, Vol. 11, No. 5, 09.2007, p. 712-724.

Research output: Contribution to journalArticle

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