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TitleSubmarine Mass Movements in Canada: Geohazards with Far-Reaching Implications
AuthorMosher, D C
SourceComptes rendus de la 4e Conférence canadienne sur les géorisques: des causes à la gestion/Proceedings of the 4th Canadian Conference on Geohazards : From Causes to Management; by Locat, J (ed.); Perret, D (ed.); Turmel, D (ed.); Demers, D (ed.); Leroueil, S (ed.); 2008 p. 55-62
Alt SeriesEarth Sciences Sector, Contribution Series 20080018
Lang.English; French
ProvinceEastern offshore region; Western offshore region; Offshore region; Northern offshore region
AreaSt. Lawrence Estuary; Grief Point; St. Pierrre Slope; Grand Banks; Scotian Slope; Labrador margin; Hopedale Saddle
Subjectsmarine geology; environmental geology; coastal environment; coastal studies; coastal erosion; coastal management; shoreface deposits; shorelines; shoreline changes; landslide deposits; landslides; submarine features; submarine transport; tsunami; continental slope; slope deposits; slope failures; slope stability; geohazards
Illustrationssketch maps; images; cross-sections
ProgramGeoscience for Oceans Management, Geohazards and Constraints to Offshore Development
AbstractCanada has the longest coastline and largest continental margin of any other nation in the World. As a result it is vulnerable to marine geohazards, such as submarine landslides and consequent tsunamis. Coastal landslides represent a specific threat because of their possible proximity to societal infrastructure and high tsunami potential. They occur without warning and with little time lag between failure and possible tsunami impact. Continental margin landslides are common in the geologic record but rare on human timescales. Some ancient submarine landslides are massive but more recent events indicate that even relatively small slides on continental margins can generate devastating tsunamis. Tsunami impact can be 100's of km away from the source event. Identification of high potential submarine landslide regions, combined with an understanding of landslide and tsunami processes and sophisticated tsunami propagation models are required to identify areas of high risk of impact.