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TitleA proposed landslide susceptibility map of Canada based on GIS
AuthorBobrowsky, P; Dominguez, M J
SourceSecond world landslide forum, abstract book; 2011 p. 280
Year2011
Alt SeriesEarth Sciences Sector, Contribution Series 20100495
MeetingSecond World Landslide Forum; Rome; IT; October 3-7, 2011
Documentbook
Lang.English
Mediapaper; on-line; digital
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectsengineering geology; surficial geology/geomorphology; landslides; slope failures; slope stability; geographic information system
ProgramNational-Scale Geohazard Assessments, Public Safety Geoscience
AbstractCanada is a large country (close to 10 millions km2), with significant environmental diversity and affected by a great variety of natural hazards. Landslides are especially damaging (it is estimated that more individuals have died in Canada from landslides than all other natural hazards combined, during the past 150 years) and are widespread across the Canadian territory. Despite this extensive occurrence, the exact location of instability is not homogeneous across the country and depends on several factors. Based on expert knowledge it is known that there is a wide range in scale and diversity of environments, especially as it pertains to landslide problems. Bearing this in mind we have recognized and differentiated the following regions: 1) the vast territory (> 4 millions km2) occupied by the Canadian Shield (CS), a very stable environment where instability problems are not as abundant as in other areas; 2) an area up to 300,000 km2 located just south of the Hudson Bay (Hudson Bay lowlands, HBL). Finally, the remaining terrain has been distinguished between: 3) the areas where the slope is lower than 1 degree (low relief areas, L) and 4) the high relief areas, those where the slope is greater than 1 degree (high relief areas, H). Given the above, a proposed landslide susceptibility map of Canada is presented in this study. The final map has been constructed based primarily on GIS, by considering digital layers of relevant national information including: slope angle, aspect, precipitation, permafrost, surficial geology, vegetation, distance to rivers, distance to coast (lakes and oceans) and bedrock lithology. These variables have been categorized into several classes depending on their greater or lesser favourability to influence slope instabilities.
The values assigned to each class are not equal for the whole country and it varies depending on the scale environment considered (CS, HBL, H or L). The 1:5 million scale final map provides an excellent tool for visually illustrating regional slope instability susceptibility across the country. It can be considered as a first approximation for individuals interested in pursuing more detailed investigations.
GEOSCAN ID288103