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TitleFailure mechanism of a prehistoric landslide in Champlain Sea clay at Breckenridge, Quebec
AuthorWang, B
SourceGeoEdmonton 2018: the 71st Canadian Geotechnical Conference and the 13th Joint CGS/IAH-CNC Groundwater Conference, proceedings; 144, 2018 p. 1-8
Alt SeriesNatural Resources Canada, Contribution Series 20180039
PublisherCanadian Geotechnical Society
MeetingGeoEdmonton 2018: the 71st Canadian Geotechnical Conference and the 13th Joint CGS/IAH-CNC Groundwater Conference; Edmonton, AB; CA; September 23-26, 2018
Mediapaper; digital
File formatpdf
Lat/Long WENS -76.0000 -75.7500 45.5000 45.4167
Subjectssurficial geology/geomorphology; engineering geology; landslides; slope failures; slope stability analyses; clays; marine clays; sensitive clays; soils; earthquakes; seismicity; shear tests; shear strength; penetrometers; models; grain size distribution; plasticity; plastic limit analysis; liquid limit analyses; Champlain Sea Clay; Champlain Sea Plain; translational landslides; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; graphs; geoscientific sketch maps; geophysical images; profiles; tables; graphs; plots; models
ProgramPublic Safety Geoscience Assessing Earthquake Geohazards
Released2018 09 01
AbstractThis paper discusses the failure mechanism of a prehistoric landslide at Breckenridge, Quebec. The landslide is a Champlain Sea clay failure triggered by an earthquake about 1020 cal yr BP. Field and laboratory test data and other evidence indicate that the landslide likely occurred as a translational failure of the overall slope rather than a retrogressive failure as is commonly observed in sensitive clays. Slope stability analysis indicates that a threshold ground acceleration of 0.28 g is required to trigger the landslide. The findings provide knowledge about sensitive clay failure process as well as prehistoric seismicity in the region.
Summary(Plain Language Summary, not published)
I have been doing geotechnical studies to understand how a landslide occurred at Breckenridge, Quebec about a thousand years ago when an earthquake struck the region. This is part of a study of several similar landslides in the region to estimate the magnitude of the earthquake. I have published a paper about this landslide before that reported the factual data collected from the site and laboratory. This current paper extends the previous publication and presents analysis results and interpretations. It estimates the minimum shaking intensity (ground acceleration) required to trigger the landslide.

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