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TitleVolcanoes and volcanic hazards
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHickson, C J; Edwards, B R
SourceA synthesis of geological hazards in Canada; by Brooks, G RORCID logo (ed.); Geological Survey of Canada, Bulletin 548, 2001 p. 145-181, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
MapsPublication contains 1 map
Map Info.location, volcanoes, tephra deposits, 1:6,666,666
Mediapaper; on-line; digital
RelatedThis publication is contained in A synthesis of geological hazards in Canada
File formatpdf
ProvinceBritish Columbia; Yukon
NTS82B; 82C; 82D; 82E; 82F; 82G; 82L; 82M; 82N; 82O; 83C; 83D; 83E; 83F; 83L; 92; 93; 94; 103; 104; 105; 114; 115; 116; 117; 106B; 106C; 106D; 106E; 106F; 106K; 106L; 106M
AreaWestern Canada
Lat/Long WENS-142.0000 -114.0000 70.0000 48.0000
Subjectstectonics; environmental geology; surficial geology/geomorphology; volcanic studies; volcanology; volcanoes; cinder cones; volcanic vents; volcanism; volcanic features; stratovolcanoes; mudflows; floods; Holocene; lava flows; pyroclastics; acid rain; health hazards; Quaternary
Illustrationssketch maps; schematic diagrams; photographs; aerial photographs
Released2001 04 01
AbstractIn Canada, potentially active volcanoes are found only in British Columbia and the Yukon Territory, where they represent cinder cones, shield volcanoes, and stratovolcanoes. Magma composition controls how a volcano erupts. Low-viscosity magmas (basalt) erupt effusively and represent a low-level hazard. Magmas with higher viscosity (dacite) often erupt explosively, creating significant, far-reaching hazards. The explosion creates small rock fragments or ash that is often carried high above the volcano. These abrasive particles, caught in high-altitude winds, are carried for hundreds of kilometres and affect equipment with moving parts. Hot avalanches of semi-molten rock, or pyroclastic flows, can destroy large areas around the volcano. Additionally, when they descend snow-covered flanks, they can lead to catastrophic melting, sending mud and water cascading into surrounding drainage systems. Even long after an eruption, denuded slopes and unstable rock faces can make the area prone to floods and rock avalanches.

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