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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
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.

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