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TitleLocal intensity of an earthquake that triggered Quyon valley landslide 1020 cal BP / Local intensity of an earthquake that triggered Quyon valley landslide 10120 cal BP
AuthorWang, B
SourceGeoVancouver 2016: Conference program and abstracts, 69th Annual Canadian Geotechnical Conference -/GeoVancouver 2016 : Programme de la conférence et résumés, 69ème Conférence annuelle canadienne de géotechnique; by Canadian Geotechnical Society; 2016 p. 149
LinksOnline - En direct (complete volume - volume complet, PDF, 11.6 MB)
Alt SeriesEarth Sciences Sector, Contribution Series 20150420
PublisherCanadian Geotechnical Society
MeetingGeoVancouver 2016: 69th Canadian Geotechnical Conference - 69ème Conférence annuelle canadienne de géotechnique; Vancouver, BC; CA; October 2-5, 2016
Mediaon-line; digital
File formatpdf
Lat/Long WENS -76.1694 -76.1667 45.5028 45.5000
Subjectsgeophysics; seismology; earthquakes; landslides; paleoearthquake; Cone penetrometer tests (CPT)
ProgramWestern Canada Geohazards Project, Public Safety Geoscience
AbstractGeotechnical studies were carried out to determine the seismic loading required to trigger the enormous Quyon valley landslide, southwestern Quebec, previously hypothesized to be triggered by a paleoearthquake at ~1020 cal BP. Cone penetrometer tests (CPT) and field vane shear tests were conducted at six sites. The results indicate that the soil undrained shear strength increases linearly with depth. A slip surface was delineated from the CPT data to be 25 m to 50 m below the original surface. Limit equilibrium models were constructed for slope stability analyses of seven sections within the source area: one longitudinal section along the river and six cross-sections perpendicular to the river. The minimum seismic load (peak horizontal ground acceleration) required to cause slope failure was determined by trial-and-error for each section. The longitudinal and cross-sectional models resulted in the same critical seismic load, which is consistent with the earthquake-trigger hypothesis as well as surficial observations that the landslide developed both longitudinally and laterally. Further studies of other landslides hypothesized to have been triggered by the same earthquake are required to estimate the magnitude and the epicentre of the earthquake.
Summary(Plain Language Summary, not published)
This research is to determine the minimum intensity of ground shaking that caused the Quyon landslide about a thousand years ago. Slope stability was simulated by reconstructing the slope with data from field and laboratory investigations. It was found that the slope may fail at a local shaking acceleration of 0.27 g (g = gravitational acceleration). Further studies of other landslides are underway to locate the epicentre and to determine the magnitude of the earthquake.