| Titre | Evidence of a strong paleoearthquake in ~9.1 ka cal BP interpreted from mass transport deposits, western Quebec-northeastern Ontario, Canada |
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| Auteur | Brooks, G R |
| Source | Quaternary Science Reviews vol. 234, 106250, 2020 p. 1-16, https://doi.org/10.1016/j.quascirev.2020.106250 |
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190318 |
| Éditeur | Elsevier |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.quascirev.2020.106250 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Québec; Ontario |
| SNRC | 31M/06; 31M/07; 31M/08; 31M/09; 31M/10; 31M/11; 31M/14; 31M/15; 31M/16; 31N/05; 31N/12; 31N/13; 32C/04; 32C/05; 32C/12; 32C/13; 32D; 41O/08; 41O/09; 41O/16; 41P/05; 41P/06; 41P/07; 41P/08; 41P/09; 41P/10;
41P/11; 41P/12; 41P/13; 41P/14; 41P/15; 41P/16; 42A; 42B/01; 42B/08; 42B/09; 42B/16 |
| Région | Kirkland Lake; Rouyn-Noranda; Dasserat Lake; Dufresnoy Lake; Duparquet Lake; Chassignolle Lake; Malartic Lake |
| Lat/Long OENS | -82.4167 -77.8333 49.0000 47.2500 |
| Sujets | Holocène; secousses séismiques; catalogues des tremblements de terre; sismicité; magnitudes des séismes; epicentres; glissements de terrain; mouvement de masse; dépôts postglaciaires; varves; dépôts de
glissement de terrain; carottes de sediments lacustres; épaisseur des sediments lacustres; corrélation; cadre tectonique; crevasses; fosses d'effondrement; levés géophysiques; levés acoustiques; Lac glaciaire d'Ojibway; Zone sismique de l'ouest du
Québec; sédiments lacustres; sédiments glaciolacustres; géologie des dépôts meubles/géomorphologie; stratigraphie; géophysique; tectonique; Nature et environnement; Sciences et technologie; Phanérozoïque; Cénozoïque; Quaternaire |
| Illustrations | cartes géolscientiques généralisées; cartes de localisation; séries chronologiques; profils géophysiques; images géophysiques; tableaux; photographies |
| Programme | Géoscience pour la sécurité publique, Société de gestion des déchets nucléaires |
| Diffusé | 2020 03 09 |
| Résumé | (disponible en anglais seulement)
This paper reviews and expands upon stratigraphic and chronologic evidence supporting the interpretation of a strong, early postglacial paleoearthquake in
western Quebec-northeastern Ontario, Canada. Event horizon mapping at Dasserat, Dufresnoy and Duparquet lakes, Quebec, coring at Chassignolle and Malartic lakes, Quebec, analysis of varve exposures near both the Twin Falls and Frederick House dams,
Ontario, and review of published and unpublished logs of varve exposures, reveal that mass transport deposits formed in, or are inferred to have formed in, varve year (vyr) 1483 (relative to the Timiskaming varve series, and about 9.1 ka cal BP) are
present at numerous locations within the study area. The spatial extent of the vyr 1483 mass transport deposit signature covers at least 14,600 km2, and is best explained by shaking from a paleoearthquake. The magnitude of the event is estimated to
be a minimum of M ~7.3, which is indicative of a strong paleoearthquake. The vyr 1483 paleoearthquake is one of 11 events of greater than or equal to M ~5, occurring within a 425 varve year period between ~9.4 and 8.95 ka cal BP, and is likely part
of a period of elevated, early postglacial, seismicity associated with rapid crustal unloading. The absence of an equivalent signature within the younger portion of the glaciolacustrine or lacustrine deposits in local lakes, implies that this
paleoearthquake is the strongest to occur within the study area since about 9.1 ka cal BP. The highly-precise correlation of widely-spaced mass transport and disturbed deposits provided by varves is essential to the paleoearthquake
interpretation. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Les dépôts de glissements de terrain enfouis dans les sédiments d'un grand lac glaciaire maintenant drainé ont un âge commun et peuvent être
suivis sur 13,200 km2 dans le nord-est de l'Ontario et l'ouest du Québec. On pense que les glissements de terrain ont été provoqués par un puissant tremblement de terre ancien, il y a environ 9100 ans. |
| GEOSCAN ID | 321073 |
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