Assessing earthquake site amplification for deep soil sites with uncertain bedrock conditions

C. Volpini, J. Douglas

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

Site-response analysis is commonly performed using shallow (<50m) shear-wave velocity profiles. The depth at which the bedrock motion is input into the analysis is one of the main parameters that influences the site response. Deciding on the appropriate depth can be difficult because of a lack of information (the "dark zone") below a few tens of meters of depth due to the high cost of investigating greater depths. However, the deep part of the profile can have a large impact on the site response. Here we use a database of over 1,000 shear-wave velocity profiles from strong-motion stations in the USA, Europe and Japan to develop a procedure to generate deep profiles that are consistent with observations and imposed constraints (e.g. presence of velocity inversions). By comparing the site response from the generated profile with the response of a known profile we demonstrate the importance of this "dark zone".

Original languageEnglish
Title of host publicationEarthquake Geotechnical Engineering for Protection and Development of Environment and Constructions
Subtitle of host publicationProceedings of the 7th International Conference on Earthquake Geotechnical Engineering, (ICEGE 2019), June 17-20, 2019, Rome, Italy
EditorsFrancesco Silvestri, Nicola Moraci
Place of PublicationLondon
Pages5590-5596
Number of pages7
DOIs
Publication statusPublished - 19 Jul 2019
Event7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019 - Rome, Italy
Duration: 17 Jan 201920 Jan 2019

Conference

Conference7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019
Country/TerritoryItaly
CityRome
Period17/01/1920/01/19

Keywords

  • deep soil
  • bedrock
  • bedrock motion
  • earthquake assessment

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