Abstract
On April 15 2014, a landslide occurred on the east shore of a lake in the municipality of Lac-des-Seize-Îles, about 100 km north of Montréal, Québec, Canada. The coastal landslide, with a length of 94 m and a width of 55 m, had a volume of about 30,500 m3 of sandy to gravelly till. It was likely triggered by a significant amount of water infiltration caused by a heavy rain coincident with an accelerated snow melt. The displaced mass spread on the lake floor and triggered a tsunami that broke and partly lifted the ice cover. Water and ice damaged several seasonal residences and boathouses on the periphery of the lake, in an area extending 450 m north and 500 m south of the landslide debris location. Observations on aerial photographs taken shortly after the event revealed the existence of radial structures on the ice cover in the affected area resulting from the evolution of the tsunami wave. Investigations carried out on east and west shores showed evidences of net marks on tree trunks explained by a maximum inundation height which can be as much as 1.8 m directly in front of the landslide position on the west shore.
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Acknowledgments
This work has been possible with the support of the Section des mouvements de terrain of the Ministère des Transports du Québec who rapidly realised and shared the aerial photographs of the affected zone. Thanks also to Richard Carignan of the Université de Montréal who has given us the access to the bathymetric data of the lake . We also thank the two reviewers of the manuscript, David Mosher and Carl B. Harbitz, who provided constructive comments.
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Leblanc, J., Turmel, D., Therrien, J., Locat, J. (2016). Observations of Coastal Landslide-Generated Tsunami Under an Ice Cover: The Case of Lac-des-Seize-Îles, Québec, Canada. In: Lamarche, G., et al. Submarine Mass Movements and their Consequences. Advances in Natural and Technological Hazards Research, vol 41. Springer, Cham. https://doi.org/10.1007/978-3-319-20979-1_61
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DOI: https://doi.org/10.1007/978-3-319-20979-1_61
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