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TitleTowards a GIS-based rockfall hazard assessment along the Quebec City Promontory, Quebec, Canada
AuthorBaillifard, F; Jaboyedoff, M; Rouiller, J -D; Robichaud, G; Locat, P; Locat, J; Couture, R; Hamel, G
SourceLandslides: evaluation and stabilization: proceedings of the ninth International Symposium on Landslides/Glissements de terrain. Evaluation et stabilisation : comptes rendus du neuvième sympoisum international sur les glissements de terrain; by Lacerda, W A (ed.); Ehrlich, M (ed.); Fontoura, S A B (ed.); Sayão, A S F (ed.); vol. 1, 2004 p. 207-213
Alt SeriesGeological Survey of Canada, Contribution Series 2003244
PublisherA.A. Balkema Publishers/Taylor & Francis Group (Leiden, The Netherlands/London, UK)
Meeting9th International Symposium on Landslides / 9e Sympoisum international sur les glissements de terrain; Rio de Janiero; BR; June 28 - July 2, 2004
AreaQuébec City
Lat/Long WENS -71.5000 -71.0000 47.0000 46.7500
Subjectsengineering geology; surficial geology/geomorphology; structural geology; landslide deposits; landslides; slope stability; slope stability analyses; structural analysis; watersheds; kinematic analysis; topography; hazard assessment; geological hazards; geographic information system applications; Phanerozoic; Cenozoic; Quaternary
Illustrationsgraphs; tables; stereograms; block diagrams; aerial photographs; sketches; histograms
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
AbstractQuebec City is built on a promontory, oriented south-eastwards along the northern shore of the St. Lawrence River. Since 1775, 53 landslides occurred, causing 88 fatalities and injuring 70 people. More-over, about twenty houses were destroyed and about fifteen were damaged. The analysis of the landslide da-tabase makes it possible to extract the main instability factors, that are integrated in an original GIS-based method. The proposed method enables to assess the hazard along a selected profile. The simulated landslide frequency not only shows a good agreement with the observed one, but also makes it possible to individuate sections with a high landslide susceptibility. Moreover, frequencies can be calculated, which supply the base for risk calculations.