| Title | Faults and lineaments of the Western Quebec Seismic Zone, Quebec and Ontario |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Lamontagne, M ;
Brouillette, P; Grégoire, S; Bédard, M P; Bleeker, W |
| Source | Geological Survey of Canada, Open File 8361, 2020, 28 pages (1 sheet), https://doi.org/10.4095/321900  Open Access |
| Image |  |
| Image |  |
| Year | 2020 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Maps | 1 map |
| Map Info. | geological, structural, 1:750,000 |
| Projection | Universal Transverse Mercator Projection, UTM zone 18 (NAD83) |
| Media | on-line; digital |
| Related | This publication is related to Faults and lineaments of the
Quebec City, Charlevoix and Saguenay-Lac St-Jean regions, Québec |
| File format | readme
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| File format | pdf; rtf; xlsx (Microsoft® Excel® 2016); gdb (ESRI® ArcGIS(TM) 10.6.1); shp (ESRI® ArcGIS(TM) 10.6.1); xml (ESRI® ArcGIS(TM) 10.6.1); mxd (ESRI® ArcGIS(TM) 10.6.1); dbf (ESRI® ArcGIS(TM) 10.6.1);
tif |
| Province | Quebec; Ontario |
| NTS | 31B; 31C; 31D; 31E; 31F; 31G; 31H/03; 31H/04; 31H/05; 31H/06; 31H/11; 31H/12; 31H/13; 31H/14; 31I/03; 31I/04; 31I/05; 31I/06; 31I/11; 31I/12; 31I/13; 31I/14; 31J; 31K; 31L; 31M; 31N; 31O; 31P/03; 31P/04;
31P/05; 31P/06; 31P/11; 31P/12; 31P/13; 31P/14 |
| Area | St. Lawrence River; Ottawa River; Montreal; Gatineau; Mont-Laurier; Laurentian Mountains; Ottawa; Lake Nipissing; Lake Simcoe; Rideau Lakes; Lake Timiskaming |
| Lat/Long WENS | -80.0000 -73.0000 48.0000 44.0000 |
| Subjects | regional geology; structural geology; tectonics; geophysics; Science and Technology; Nature and Environment; crustal studies; crustal structure; crustal movements; bedrock geology; structural features;
faults; faults, normal; faults, strike-slip; lineaments; grabens; shear zones; intrusions; diabase dykes; structural interpretations; structural trends; seismic zones; seismicity; seismic risk; earthquakes; earthquake magnitudes; earthquake risk;
topography; geophysical interpretations; magnetic interpretations; total field magnetics; seismic interpretations; tectonic environments; tectonic interpretations; rifts; seismology; Western Quebec Seismic Zone; Ottawa-Bonnechere Graben; Canadian
National Topographic Data Base (NTDB); Grenville Front; Grenville Orogeny; St. Lawrence Rift System; North American Plate; Canadian Shield; St. Lawrence Platform; Logan's Line; Appalachian Province; Databases; Digital elevation data; Geographic data;
Geographic information systems; Phanerozoic; Paleozoic; Precambrian; Proterozoic |
| Illustrations | location maps; index maps; digital elevation models; geoscientific sketch maps; screen captures; tables; cross-sections |
| Program | Public Safety Geoscience Eastern Canada Geohazards Assessment Project |
| Released | 2020 03 31 |
| Abstract | This Open File contains the interpreted brittle lineaments and a compilation of mapped faults of an area bound by latitudes 44°N and 48°N and longitudes 73°W and 80°W. The area includes most of the
Ottawa River watershed. It also covers most of eastern Ontario and the Laurentians, between Montréal (QC) and North Bay (ON). The study area includes the seismically active region known as the Western Quebec Seismic Zone (WQSZ). The WQSZ is an area
where earthquakes as large as magnitude 6.2 have occurred in the past and where tens of smaller earthquakes are recorded yearly. Our study is an attempt to provide a homogeneous coverage of these brittle structures through an integration of visually
interpreted lineaments and mapped faults. The possible relationships between these brittle faults and earthquakes will be examined later.
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 clear ductile structures were not considered in this study and the more questionable ones re-evaluated subsequently against known geological information. Most of the
region of interest is southeast of the Grenville Front, where 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. With a few exceptions, 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 provincial geological maps of Quebec and Ontario, which often did not distinguish between brittle faults and ductile shear zones. Lineaments that coincided with diabase dykes were
recognized by consulting geological maps and by examining the total magnetic field. Our final product is a 1:750,000 scale map that can be used in the future to better understand the seismotectonics of this region. |
| Summary | (Plain Language Summary, not published)
This Open File Report documents interpreted brittle lineaments and mapped faults of the Western Quebec Seismic Zone. |
| GEOSCAN ID | 321900 |
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