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TitleThe anatomy of an active slide: the Gascons rockslide, Québec, Canada
AuthorCloutier, C; Locat, J; Couture, R; Jaboyedoff, M
SourceLandslides 2015 p. 1-18,
Alt SeriesEarth Sciences Sector, Contribution Series 20140406
PublisherSpringer Nature
Mediapaper; on-line; digital
File formatpdf
NTS22A/02; 22A/03
AreaGaspe Peninsula
Lat/Long WENS -65.5000 -64.5000 48.2500 48.0000
Subjectsengineering geology; geophysics; landslides; remote sensing; slope deposits; slope failures; slope stability; LiDAR
Illustrationsgeologic maps; Landsat images; satellite images; images; 3-D images; digital images; photographs; cross-sections, stratigraphic; cross-sections, structural; diagrams; tables; stereonets
ProgramGSC Northern Canada Division, Director's Office
Released2015 03 04
AbstractA railroad crosses the coastal Gascons rockslide, in Quebec, Canada. This study improves the understanding of the rockslide’s failure mechanism and post-failure behaviour responsible for the deformation in the railroad. The slide is an asymmetrical wedge failure of 410,000 m3, in rocks made up of centimetre-scale beds of nodular calcilutite alternating with sandstones and limestone. The post-failure stage of the rockslide is characterised by continuous movement of blocks with speeds ranging from 6 to 110 mm/year. The main water table is just below the sliding surface, but precipitation and snowmelt can raise it above the sliding surface in the upper part of the slide. We propose a model for the rockslide, its failure mechanism, geometry and hydrogeology to provide a baseline for interpreting the near-real-time data collected since 2009.
Summary(Plain Language Summary, not published)
A unstable rock slope is threatening a railway corridor in Gaspesie (Quebec). The rock slope behaviour has been subject to a detailed study, including its displacements, through the use of field instruments and remote sensing. The analysis ofthe displacements of the rock slope and its potential future behaviourm allow a better assessment of risk.