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What is the smallest earthquake magnitude that needs to be considered in assessing liquefaction hazard?

Green, Russell A ; Bommer, Julian J

Earthquake spectra, 2019-08, Vol.35 (3), p.1441-1464 [Periódico revisado por pares]

London, England: Earthquake Engineering Research Institute

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  • Título:
    What is the smallest earthquake magnitude that needs to be considered in assessing liquefaction hazard?
  • Autor: Green, Russell A ; Bommer, Julian J
  • Assuntos: acceleration ; earthquake prediction ; earthquakes ; equations ; geologic hazards ; ground motion ; induced earthquakes ; infrastructure ; liquefaction ; magnitude ; natural hazards ; peak ground acceleration ; risk assessment ; seismic response ; seismic risk ; Seismology
  • É parte de: Earthquake spectra, 2019-08, Vol.35 (3), p.1441-1464
  • Descrição: Probabilistic assessments of the potential impact of earthquakes on infrastructure entails the consideration of smaller magnitude events than those generally considered in deterministic hazard and risk assessments. In this context, it is useful to establish if there is a magnitude threshold below which the possibility of triggering liquefaction can be discounted because such a lower bound is required for probabilistic liquefaction hazard analyses. Based on field observations and a simple parametric study, we conclude that earthquakes as small as moment magnitude 4.5 can trigger liquefaction in extremely susceptible soil deposits. However, for soil profiles that are suitable for building structures, the minimum earthquake magnitude for the triggering of liquefaction is about 5. We therefore propose that in liquefaction hazard assessments of building sites, magnitude 5.0 be adopted as the minimum earthquake size considered, while magnitudes as low as 4.5 may be appropriate for some other types of infrastructure.
  • Editor: London, England: Earthquake Engineering Research Institute
  • Idioma: Inglês
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