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TitleLandslide susceptibility mapping of the Sea to Sky transportation corridor, British Columbia, Canada: comparison of two methods
AuthorBlais-Stevens, A; Behnia, P; Kremer, M; Page, A; Kung, R; Bonham-Carter, G
SourceBulletin of Engineering Geology and the Environment vol. 71, no. 3, 2012 p. 447-466,
Alt SeriesEarth Sciences Sector, Contribution Series 20110029
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS92J/07; 92G/06
AreaPemberton; Horseshoe Bay
Lat/Long WENS-123.5000 -122.5000 50.5000 49.2500
Subjectsengineering geology; landslides; landslide deposits; slope deposits; slope failures; slope stability; slope stability analyses; debris flows; debris flow deposits
Illustrationslocation maps; tables; flow charts; pie charts; plots
ProgramTargeted Hazard Assessments in Western Canada, Public Safety Geoscience
Released2012 06 21
AbstractThe Sea to Sky corridor stretches over a distance of 135 km into British Columbia's Coast Mountains. The corridor has witnessed hundreds of historical and prehistoric landslides. In the last 154 years, 155 landslide events have been reported. The most common types of landslides are rockfalls and debris flows, which are small in volume, but can be quite damaging. These are more abundant in the southern part of the corridor where infrastructure is built close to steep slopes. Two different methods were adapted to create debris flow and rockfall/rock slide susceptibility maps. Both qualitative heuristic and fuzzy logic susceptibility maps showed a similar distribution
of susceptibility zones, especially high susceptibility. Correlation of high susceptibility zones with occurrence of historical and mapped geological landslide events was very good. Success rate curves were calculated for extrapolated zones of initiation for debris flow and
rockfall/rock slide deposits. Success rate curves were better for debris flow than rockfall/rockslide maps.