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Seismic microzonation of a region with complex surficial geology based on different site classification approaches

Salsabili Mohammad, Saeidi Ali, Rouleau Alain et Nastev Miroslav. (2021). Seismic microzonation of a region with complex surficial geology based on different site classification approaches. Geoenvironmental Disasters, 8, e27.

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URL officielle: http://dx.doi.org/doi:10.1186/s40677-021-00198-8

Résumé

A seismic microzonation study was conducted to refine the seismic hazard model for the city of Saguenay, Canada. The Quaternary geology underlying Saguenay shows complex glacial and post-glacial stratigraphy with a number of buried valleys filled with fluvioglacial and glaciomarine sediments. High impedance contrast between rock formations and surficial sediments is prone to seismic amplification. To evaluate their applicability, advantages and limitations in capturing the geological specificity of the study area, four site classification methods were applied: the current National Building Code of Canada (NBCC) and Eurocode 8, both mainly based on the average shear-wave velocity for the surficial sediments (VS,avg) and for the top 30 m (VS,30); a method based on the fundamental site period (T0); and a hybrid method based on the combination of VS,30, T0 and VS,avg. The study specifically aimed to evaluate the importance of the site classification parameters on the resulting microzonation maps. VS,30 is capable to present the geological and geotechnical site conditions, however, the results may be further improved by considering Vs,avg in shallow and T0 in thick layers of soil sediments as secondary parameters. The T0 method gives also satisfactory results with T0 showing a better correlation to Vs,30 than to Vs,avg. The versatile hybrid method may be challenging to apply in certain cases with its nine different site categories and parameters.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:8
Pages:e27
Version évaluée par les pairs:Oui
Date:11 Octobre 2021
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Unités de recherche > Chaire de recherche du Canada en prévision et prévention des risques liés aux aléas hydro-géotechniques (P2GeoRISQUE)
Mots-clés:seismic microzonation, Building code, shear-wave velocity, fundamental site period, microzonation sismique, code du bâtiment, vitesse des ondes de cisaillement, période fondamentale du site
Déposé le:17 nov. 2021 00:57
Dernière modification:17 nov. 2021 00:57
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