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Earthquake Induced Landslides in Lake Éternité, Québec, Canada


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Locat, Jacques et Turmel, Dominique et Habersetzer, Marion et Trottier, Annie-Pier et Lajeunesse, Patrick et St-Onge, Guillaume (2016). Earthquake Induced Landslides in Lake Éternité, Québec, Canada. In: Lamarche G. et al. (eds) Submarine Mass Movements and their Consequences. Advances in Natural and Technological Hazards Research, 41 . p. 361-370.

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Lake Éternité, located between the Upper Saguenay Fjord and the St. Lawrence River has registered many submarine slides caused by at least one earthquake. Landslides are mostly rooted in the gyttja (Holocene sediments). Mapping of landslides revealed a total of 128 scars over an area of only 3.2 km2. A larger proportion of the landslide scars are located on the SE and NW facing slope which may support an epicentre location for the strongest earthquake (1663?), to the NW or NE of the lake. The preliminary numerical analysis of the site effects caused by topography on local preferred seismic amplification is not conclusive enough to support the observations made for landslides. Associating landslides to specific earthquakes will only be possible with further investigations, including coring of various features including rupture surfaces. The study also revealed interesting slide morphologies developed in homogeneous sediments, providing excellent examples for future modelling of similar events. -- Keywords : Geomorphology ; Geophysics ; Gyttja ; Seismic wave ; Directivity.

Type de document : Article
Validation par les pairs : Oui
Départements et unités départementales : Institut des sciences de la mer de Rimouski (ISMER)
Déposé par : DIUQAR UQAR
Date de dépôt : 22 oct. 2020 13:35
Dernière modification : 22 oct. 2020 13:35

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