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TitreDeglacial and postglacial paleoseismological archives in mass-movement deposits of lakes of south-central Quebec
AuteurTrottier, A -P; Lajeunesse, P; Normandeau, A; Gagnon-Poiré, A
SourceISC2018 - 20th International Sedimentological Congress, abstract volume; 2018 p. 1
Année2018
Séries alt.Ressources naturelles Canada, Contribution externe 20180225
ÉditeurIAS
RéunionISC2018 - 20th International Sedimentological Congress; Québec, QC; CA; août 13-17, 2018
Documentsite Web
Lang.anglais
Mediapapier; numérique; en ligne
Formatspdf
ProvinceQuébec
SNRC21E; 21L; 21M; 21N; 22C; 22D; 31F; 31G; 31H; 31I; 31J; 31K; 31L; 31M; 31N; 31O; 31P; 32A; 32B; 32C; 32D
Lat/Long OENS -80.0000 -68.0000 49.0000 45.0000
Sujetsséismologie; secousses séismiques; antecedents glaciaires; déglaciation; dépôts glaciaires; dépôts postglaciaires; dépôts de glissement de terrain; eaux de surface; lacs; levés géophysiques; levés acoustiques; bathymétrie; échantillons carrotés; sedimentation; Zone sismique de Charlevoix-kamouraska ; sédiments lacustres; géologie des dépôts meubles/géomorphologie; géophysique; stratigraphie; Phanérozoïque; Cénozoïque; Quaternaire
ProgrammeRisques géo marines, Géoscience pour la sécurité publique
ProgrammeCRSNG Conseil de recherches en sciences naturelles et en génie du Canada
Diffusé2018 08 01
Résumé(disponible en anglais seulement)
Investigation of seismic activity in southern Québec is important for natural hazard management since two major active seismic zones with many historical records are located in the region: the Western Québec and the Charlevoix-Kamouraska seismic zones, with the latter being the most active in northeastern America. This poster describes a dataset of high-resolution bathymetry imagery, subbottom profiles and sediments cores collected in three lakes (Maskinongé, Lac-aux-Sables and Lake Saint-Joseph) located between two active seismic zones, in south-central Québec. The lacustrine geomorphology observed on high resolution swath bathymetry imagery, acoustic subbottom profiles and the sediment analysis indicate that the lakes were disturbed by seismically-induced mass-movements since deglaciation. Mass-movement deposits (MMDs) were observed on subbottom profiles at three different stratigraphic levels. The position of the MMDs in the stratigraphic sequence of the region and the use of the depositional rate from 210Pb activity on sediment cores from each lake allow the identification of three distinct and major earthquake events: 1) during deglaciation between ~11.1 and 10 ka cal. BP; 2) around 810 ± 370 AD; and 3) the well documented 1663 AD M>7 historical earthquake. The second earthquake event that occurred prior the the 1663 AD event is responsible for remobilizing the largest volume of sediments in the entire stratigraphic sequences of the lakes. However, this event did not necessarily reached a higher magnitude than the historical 1663 earthquake, as its epicenter could have been located closer to the studied lakes or sediments could have been more readily available to be remobilized when it occurred.
Résumé(Résumé en langage clair et simple, non publié)
Nous avons identifié et daté des glissements de terrain subaquatiques dans le sud du Québec qui ont été déclenchés par des tremblements de terre durant les derniers 10 000 ans, nous permettant de raffiner l'historique des tremblements de terre dans le sud-est du Québec.
GEOSCAN ID311307