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TitleLandslide susceptibility maps of the Sea to Sky Corridor, British Columbia - a qualitative approach
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBlais-Stevens, AORCID logo; Kung, R
SourceGeological Survey of Canada, Open File 6169, 2009, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
MapsPublication contains 2 maps
Map Info.surficial geology, debris flow, 1:100,000
Map Info.surficial geology, rock avalanche, 1:100,000
Mediapaper; on-line; digital
File formatJPEG2000; pdf
ProvinceBritish Columbia
NTS92G/06; 92G/11; 92G/14; 92J/02; 92J/07
AreaVancouver; Howe Sound; Sea to Sky Highway; Whistler; Pemberton; Horseshoe Bay
Lat/Long WENS-123.5000 -122.5000 50.5000 49.2500
Subjectssurficial geology/geomorphology; engineering geology; environmental geology; landslides; debris flows; debris flow deposits; flood potential; floods; landslide deposits; mudflows; gravity sliding; erosion susceptibility
Illustrationstables; flow charts
Released2009 09 22
AbstractHistorically, the Sea to Sky Corridor has witnessed 155 reported landslide events in the last 154 years. As part of the Public Safety Geoscience Program at the Geological Survey of Canada, a preliminary landslide susceptibility mapping activity was undertaken. The resulting maps are presented as work-in-progress. The method used was a qualitative parametric approach based on the available landslide inventory and baseline information (Journeay and Monger, 1998; Riopel et al., 2006; Blais-Stevens, 2007; 2008abc; Blais-Stevens and Septer, 2008; Couture and Riopel, 2008). We divided the landslide susceptibility thematic mapping activity into producing two separate maps based on the more frequent types of landslides in the area and the fact that the parameters causing these types of landslides are very different from one another. One landslide susceptibility map was created for rock falls/rock slides and the other, for debris flows. In each map, a series of information layers (Fig. 1) was compiled from available documentation and/or derived from DEMs (Riopel et al., 2006; Couture and Riopel, 2008). From this information, a parametric equation was defined where the information layers served as parameters with each parameter being given a weight. The units within each layer of information were also given a rating (See examples of rating in Tables 1 and 2). The resulting equation gave a Susceptibility Index (SI) ranging between 0-1 for each (25 m x 25 m) pixel. For the final products, SI units were divided into four colour-coded categories, from Low (green), Medium-Low (yellow), Medium-High (orange), and High (red).

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