| Title | Landslide susceptibility maps of the Sea to Sky Corridor, British Columbia - a qualitative approach |
| Download | Downloads |
| Author | Blais-Stevens, A; Kung, R |
| Source | Geological Survey of Canada, Open File 6169, 2009, 1 sheet, https://doi.org/10.4095/247994 (Open Access) |
| Image |  |
| Year | 2009 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Maps | Publication contains 2 maps |
| Map Info. | surficial geology, debris flow, 1:100,000 |
| Map Info. | surficial geology, rock avalanche, 1:100,000 |
| Media | paper; on-line; digital |
| File format | JPEG2000; pdf |
| Province | British Columbia |
| NTS | 92G/06; 92G/11; 92G/14; 92J/02; 92J/07 |
| Area | Vancouver; Howe Sound; Sea to Sky Highway; Whistler; Pemberton; Horseshoe Bay |
| Lat/Long WENS | -123.5000 -122.5000 50.5000 49.2500 |
| Subjects | surficial geology/geomorphology; engineering geology; environmental geology; landslides; debris flows; debris flow deposits; flood potential; floods; landslide deposits; mudflows; gravity sliding;
erosion susceptibility; geological hazards; rock avalanches; debris avalanches |
| Illustrations | tables; flow charts |
| Released | 2009 09 22 |
| Abstract | Historically, 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). |
| GEOSCAN ID | 247994 |
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