Advances in Natural and Technological Hazards Research, 2003
With the growing development of offshore natural resources, use of sea-floor transport and commun... more With the growing development of offshore natural resources, use of sea-floor transport and communication routes, considerations for the environment and the effects of global climate changes, and will for protecting populations and their infrastructures, the need for assessing risk associated with submarine mass movements is increasing. The present paper proposes an approach for the assessment of risk associated with submarine mass movements based on geotechnical characterisation.
Advances in Natural and Technological Hazards Research, 2003
Extensive submarine mass movements have been mapped in the upper reaches of the Saguenay Fjord, Q... more Extensive submarine mass movements have been mapped in the upper reaches of the Saguenay Fjord, Québec, Canada. Our analysis indicates that they were most likely triggered by the 1663 earthquake which shook a large area in Eastern Canada. Signs of instabilities have been observed at various places and although the triggering mechanism is the same, the types of mass movements differ largely including slides, spreads and flow failures in the soft Holocene sediments. Seismic and morphological investigations have revealed the presence of a fault -like deformation possibly linked to terrestrial fractures suggesting that the epicentre of the 1663 earthquake may be located in the area.
The Betsiamites-Outardes (Quebec) Submarine Mass Movements and Their Potential for Tsunami Generation
The Betsiamites Outardes area has been the locus of a team effort to investigate the connection b... more The Betsiamites Outardes area has been the locus of a team effort to investigate the connection between submarine features indicative of large mass movements and the presence of a coastal slide scar involving about 800 millions cubic metres of raised marine deposits along the North Shore of the St. Lawrence River, about 300 km east of Québec city.. Although the signature of the coastal slide is quite clear, the underwater morphology, revealed by a multibeam survey, indicated the presence of a complex system of flow features imbricated into a channel landform most likely related to the relic Betsiamites River submarine channel system. Holocene deposits related to the high-stand delta have also been eroded leaving, in places, significant escarpment of nearly 100m. In addition there are clear bedrock related features forming the major boundary between the shelf, less than 100m deep, and the deeper part in the middle of the St. Lawrence Estuary at a depth of about 400m. Just in front of...
Advances in Natural and Technological Hazards Research, 2003
Extensive submarine mass movements have been mapped in the upper reaches of the Saguenay Fjord, Q... more Extensive submarine mass movements have been mapped in the upper reaches of the Saguenay Fjord, Québec, Canada. Our analysis indicates that they were most likely triggered by the 1663 earthquake which shook a large area in Eastern Canada. Signs of instabilities have been observed at various places and although the triggering mechanism is the same, the types of mass movements differ largely including slides, spreads and flow failures in the soft Holocene sediments. Seismic and morphological investigations have revealed the presence of a fault -like deformation possibly linked to terrestrial fractures suggesting that the epicentre of the 1663 earthquake may be located in the area.
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Papers by C. Levesque