| Title | Faults and lineaments of the Quebec City, Charlevoix and Saguenay-Lac St-Jean regions, Québec |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Lamontagne, M ;
Brouillette, P |
| Source | Geological Survey of Canada, Open File 8826, 2022, 36 pages (1 sheet), https://doi.org/10.4095/329287  Open Access |
| Image |  |
| Year | 2022 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Maps | Publication contains 1 map |
| Map Info. | geological, structural, 1:500,000 |
| Projection | Universal Transverse Mercator Projection, UTM zone 18 (NAD83) |
| Media | digital; on-line |
| Related | This publication is related to Faults and lineaments of the
Western Quebec Seismic Zone, Quebec and Ontario |
| File format | readme
|
| File format | pdf; rtf; xlsx (Microsoft® Excel®) |
| Province | Quebec |
| NTS | 21K/12; 21K/13; 21L/09; 21L/10; 21L/11; 21L/12; 21L/13; 21L/14; 21L/15; 21L/16; 21M; 21N/04; 21N/05; 21N/12; 21N/13; 22C/04; 22C/05; 22C/12; 22C/13; 22D; 22E/01; 22E/02; 22E/03; 22E/04; 22E/05; 22E/06;
22E/07; 22E/08; 22E/09; 22E/10; 22E/11; 22E/12; 22F/04; 22F/05; 22F/12; 31I/09; 31I/10; 31I/11; 31I/12; 31I/13; 31I/14; 31I/15; 31I/16; 31P; 32A; 32H/01; 32H/02; 32H/03; 32H/04; 32H/05; 32H/06; 32H/07; 32H/08; 32H/09; 32H/10; 32H/11; 32H/12 |
| Area | Charlevoix; Saguenay; Lac St-Jean; St. Lawrence River; Rivière Saint-Maurice; Rivière Saguenay |
| Lat/Long WENS | -74.0000 -69.5000 49.7500 46.5000 |
| Subjects | regional geology; structural geology; tectonics; geophysics; Science and Technology; Nature and Environment; Health and Safety; bedrock geology; structural features; faults; lineaments; grabens;
earthquakes; earthquake risk; earthquake magnitudes; epicentres; seismicity; seismic risk; seismic zones; geophysical interpretations; magnetic interpretations; tectonic setting; structural analyses; Charlevoix Seismic Zone; Grenville Orogeny;
Grenville Province; St. Lawrence Rift System; Saguenay Graben; Charlevoix Impact Structure; St. Lawrence Lowlands; Central Quebec Seismic Zone; Digital elevation data; Geographic data; Geographic information systems; Databases |
| Illustrations | index maps; location maps; geoscientific sketch maps; block diagrams; digital elevation models; screen captures; tables |
| Program | Public
Safety Geoscience Intraplate Earthquakes |
| Released | 2022 07 22 |
| Abstract | This Open File contains the interpreted brittle lineaments and a compilation of mapped faults of an area bound by latitudes 46.5N and 49.75N and longitudes 69.5W and 74W. The study area includes the
north shore of the St. Lawrence River in Québec from slightly north of Trois-Rivières to slightly north of Tadoussac, which includes most of the watersheds of the St-Maurice and Saguenay rivers and the Lac Saint-Jean. The study area includes a
seismically active region known as the Charlevoix Seismic Zone (CSZ). The CSZ is an area where at least five earthquakes of magnitudes between 5.5 and 7 have occurred in the past and where hundreds of smaller earthquakes are recorded yearly. Our
study is an attempt to provide a homogeneous coverage of the brittle structures through an integration of visually interpreted lineaments and mapped faults. The possible relationships between these brittle faults and earthquakes will be examined in
upcoming studies. Lineaments were observed mostly from the Digital Elevation Model (DEM) of the Canadian National Topographic Data Base (NTDB) at a scale of 1:250 000. The DEMs illuminated from two directions were used to first visually recognize
lineaments and second, to georeference their surface expressions in a Geographic Information System (GIS). Since the final goal was to better map the brittle faults that could be reactivated in earthquakes, the conspicuous ductile structures were not
considered in this study and the more questionable ones were re-evaluated subsequently against known geological information. The whole region of interest is southeast of the Grenville Front, and all ductile structures are related to the Grenville
orogeny (about 1 billion years ago). The recognition of brittle structures is based on the observation that they are essentially linear in plan view. On the other hand, the ductile structures are generally curved, enhance contact between different
Grenvillian lithologies, or present a distinct structural pattern. Only lineaments with a length greater than 5 km were included. After a first detection pass, lineaments at a more regional scale were drawn by interpolating between segments of
lineaments. These interpolated segments corresponded to areas where the topography was subdued and where no conspicuous trace existed. The interpreted lineaments were then compared with the geological maps of the province of Quebec which often did
not distinguish between brittle faults and ductile shear zones (or even at times, boundaries of geological units). Our final product is a 1:500,000 scale map that can be used in the future to better understand the seismotectonics of this region.
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| Summary | (Plain Language Summary, not published)
This Open File contains the interpreted brittle lineaments and a compilation of mapped faults of an area bound by latitudes 46.5°N and 49.75°N and
longitudes 69.5°W and 74°W. The study area includes the north shore of the St. Lawrence River in Québec from slightly north of Trois-Rivières to slightly north of Tadoussac, which includes most of the watersheds of the St-Maurice and Saguenay rivers
and the Lac Saint-Jean. Our study is an attempt to provide a homogeneous coverage of the brittle structures through an integration of visually interpreted lineaments and mapped faults. Our final product is a 1:500,000 scale map that can be used to
better understand the seismotectonics of this region. |
| GEOSCAN ID | 329287 |
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