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TitreA massive sensitive clay landslide, Quyon Valley, southwestern Quebec, Canada, and evidence for a paleoearthquake triggering mechanism
AuteurBrooks, G R
SourceQuaternary Research (New York) vol. 80, no. 3, 2013 p. 425-434, https://doi.org/10.1016/j.yqres.2013.07.008
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120225
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.yqres.2013.07.008
Mediapapier; en ligne; numérique
Formatspdf
ProvinceQuébec; Ontario
SNRC31F/08; 31F/09; 31G/05; 31G/12
Lat/Long OENS -76.5000 -75.5000 45.7500 45.2500
Sujetsargiles sensibles; sensitivité de terrain; glissements de terrain; dépôts de glissement de terrain; Holocène; secousses séismiques; mécanismes de tremblement de terre; antecedents de sedimentation; milieu sédimentaire; géologie des dépôts meubles/géomorphologie; Cénozoïque; Quaternaire
Illustrationslocation maps; cross-sections; plots
ProgrammeEastern Canada Geohazards Assessment Project, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
A landslide debris field covering ~ 31 km2, the presence of large sediment blocks up to hundreds of meters long, and the exposure of deposits of a single landslide along the incised course of the Quyon River are evidence of a massive failure of sensitive Champlain Sea glaciomarine sediments along the lower Quyon Valley, southwestern Quebec, Canada. Seventeen radiocarbon ages indicate that the failure occurred between 980 and 1060 cal yr BP. Twenty-four additional radiocarbon ages reveal that nine landslides within a 65-km belt in the Quyon - Ottawa area also occurred at approximately this time. In combination, the contemporaneous occurrence of ten landslides between 980 and 1060 cal yr BP, the setting or morphology of five of the other failures, and the close proximity of two of the failures to the Quyon Valley landslide provide circumstantial evidence of a paleoearthquake-triggering mechanism. The paleoearthquake is estimated to be Mw ~ 6.1 or larger, with the epicenter within the West Quebec Seismic Zone. A common earthquake-triggering mechanism for the three largest landslides in eastern Canada suggests a close link between massive failures of sensitive glaciomarine sediments and the regional seismicity.
GEOSCAN ID291907