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TitleDeglacial and postglacial paleoseismological archives in mass movement deposits of lakes of south-central Quebec
AuthorTrottier, A -P; Lajeunesse, P; Normandeau, AORCID logo; Gagnon-Poire, A
SourceCanadian Journal of Earth Sciences vol. 56, no. 1, 2018 p. 60-76, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20180268
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf; html
NTS21L/13; 31I/06; 31I/16
AreaLac Maskinongé; Lac Aux-Sables; Lac St-Joseph
Lat/Long WENS -73.5000 -71.5000 47.0000 46.2500
Subjectssurficial geology/geomorphology; geophysics; stratigraphy; sedimentology; seismology; earthquakes; epicentres; landslides; landslide deposits; seismicity; seismic zones; seismic risk; earthquake risk; surface waters; lakes; bathymetry; geophysical surveys; acoustic surveys; lake sediment cores; geological history; tectonic history; glacial history; deglaciation; depositional history; isostatic rebound; gullies; hummocks; isotopic studies; lead; cesium; Western Quebec Seismic Zone; Charlevoix--Kamouraska Seismic Zone; Champlain Sea; submergence, marine; lacustrine sediments; Phanerozoic; Cenozoic; Quaternary
Illustrationsgeoscientific sketch maps; location maps; tables; geophysical images; profiles; 3-D images
ProgramGSC Atlantic Division
Released2018 09 14
AbstractInvestigation of seismic activity in eastern Canada is important for natural hazard management as two major active seismic zones with many historical records are located in the region: the Western Québec seismic zone (WQSZ) and the Charlevoix-Kamouraska seismic zone (CKSZ), with the latter being the most active in northeastern America. This paper describes and analyses a dataset of high-resolution swath bathymetric imagery, sub-bottom profiles, and sediments cores collected in three lakes (Maskinongé, Aux-Sables, and St-Joseph) located between two active seismic zones. The geomorphology observed on high-resolution swath bathymetric imagery, the acoustic sub-bottom profiles, and the sediment analysis indicate that the lakes were disturbed by three phases of seismically induced mass movements since deglaciation: (i) during the deglacial Champlain Sea transgression and the rapid initial glacio-isostatic rebound between ~13 and 10.5 ka cal BP; (ii) around 1180 AD; and (iii) the well-documented CKSZ 1663 AD M >7 historical earthquake. The second phase of earthquake events (1180 AD) corresponds chronologically to a previously documented large landslide in western Québec, dated at ~1020 years BP. This earthquake is responsible for remobilizing the largest volume of sediments in the entire stratigraphic sequence of Lake Maskinongé, the westernmost lake. This earthquake was not recorded in Lake Aux-Sables and St-Joseph, which are located eastward from Maskinongé, but the largest mass movement deposits are associated with the well-known 1663 AD event of eastern Québec. Therefore, both earthquake events are interpreted to have different epicenters and the lakes of southeastern Québec recorded earthquakes from both seismic zones.
Summary(Plain Language Summary, not published)
We have identified mass movement deposits in lakes of south-central Québec that were triggered by earthquakes. The recurrence of earthquakes during the last 10 000 years was assessed.

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