Seismically active zone paralleling the Saint Lawrence River
The Saint Lawrence rift system is a seismically active zone paralleling the Saint Lawrence River. The rift system trends northeast and southwest and forms a half-graben that links the Ottawa-Bonnechere and the Saguenay grabens. The rift system extends more than 1,000 km (620 mi) along the Saint Lawrence valley from the Ottawa – Montreal area. Within the system, fault reactivation is believed to occur along late Proterozoic to early Paleozoic normal faults related to the opening of the Iapetus Ocean.[1]
Two significant historically active seismic zones occur along this system associated with northwest trending intersecting graben structures. The Charlevoix region has been the location of at least five magnitude six or larger earthquakes over the last 350 years, including the 1925 Charlevoix–Kamouraska earthquake. At the Lower St Lawrence zone the largest recorded earthquakes are about magnitude five. Seismic studies indicate a crustal convergence across the Saint Lawrence valley of about 0.5 mm (0.020 in) per year.[2]
The earthquakes of the Charlevoix Seismic Zone are thought to be related to the re-activation of ancient fault structures by the Charlevoix impact event.[3]
Post-glacial rebound is also a cause of earthquakes in the St. Lawrence lowlands.[4]
^Tremblay, Alain; Lemieux, Yvon (2001). "Supracrustal faults of the St. Lawrence rift system between Cap-Tourmente and Baie-Saint-Paul, Quebec" (PDF). Current Research 2001. Natural Resources Canada. ISBN 978-0-662-29890-8. M44-2001/D15E-IN.
^Mazzotti, S.; Henton, J.; Adams, J. (Spring 2004). "Crustal strain rates and seismic hazard from seismicity and GPS measurements along the St Lawrence Valley, Quebec". AGU Spring Meeting Abstracts. 2004: S14A–02. Bibcode:2004AGUSM.S14A..02M. Abstract #S14A-02.
^Anglin, F.; Buchbinder, G. (October 1981). "Microseismicity in the mid-St. Lawrence Valley Charlevoix zone, Québec". Bulletin of the Seismological Society of America. 71 (5): 1553–60. Bibcode:1981BuSSA..71.1553A. doi:10.1785/BSSA0710051553.
^"Earthquakes in southeastern Canada" (PDF). Earthquakes Canada. Natural Resources Canada. Retrieved 17 April 2020.
and 25 Related for: Saint Lawrence rift system information
The SaintLawrenceriftsystem is a seismically active zone paralleling the SaintLawrence River. The riftsystem trends northeast and southwest and forms...
geological feature known as the Reelfoot Rift, which likely formed during the Cambrian Period. The Reelfoot Rift was first described by Ervin and McGinnis...
wikidata descriptions as a fallback SaintLawrenceriftsystem – Seismically active zone paralleling the SaintLawrence River Iwata, Tomotaka; Asano, Kimiyuki...
plate tectonic spreading SaintLawrenceriftsystem – Seismically active zone paralleling the SaintLawrence River Propagating rift – Seafloor feature associated...
the area is near both the Western Quebec Seismic Zone and the SaintLawrenceriftsystem. Minor earthquakes occur in the region regularly, most of them...
Ottawa-Bonnechere Graben, which is part of the SaintLawrenceriftsystem. There have been recent earthquakes along the rift valley, the most recent being in 2000...
of the North American Plate and its origin is not well known. SaintLawrenceriftsystem "Earthquake zones in Eastern Canada". Natural Resources Canada...
extension of the Ottawa-Bonnechere Graben, a failed arm of the SaintLawrenceriftsystem which is related to the opening of the Iapetus Ocean. Formation...
Ottawa Valley. Lake Hitchcock Lake Albany Wisconsin glaciation SaintLawrenceRiftSystem L.J. Chapman and D.F. Putnam. 1951. The Physiography of Southern...
affected by some of the larger events that were centered in the SaintLawrenceriftsystem in Canada. One of these was the 1663 Charlevoix earthquake that...
the Temagami East claim block area and are associated with the SaintLawrenceriftsystem and remains seismically active. The most recently felt earthquake...
orientation. The main structures of the area are faults of the SaintLawrenceriftsystem that run parallel to the river, formed during the break-up of...
the Slovak Republic. The Cornwall–Massena earthquake along the SaintLawrenceriftsystem in North America did $2 million damage. Sweden said it would bar...
along the SaintLawrenceriftsystem, for example the Sept Iles layered intrusion and the Catoctin volcanics, and the Labrador Sea-Baffin Bay Rift, including...
SaintLawrence Seaway, the Waterway allows both ocean-going vessels and the ore, grain and coal-bearing lake freighters to travel from the system's saltwater...
archipelago of 1,864 islands that straddles the Canada–US border in the SaintLawrence River as it emerges from the northeast corner of Lake Ontario. They...
result from drainage now taking place underground rather than at the surface. Rift valleys arise principally from earth movements, rather than erosion. Many...
interior of North America that connect to the Atlantic Ocean via the SaintLawrence River. The five lakes are Superior, Michigan, Huron, Erie, and Ontario...
strike-slip faults. The main structures of the area are faults of the SaintLawrenceriftsystem that run parallel to the river, formed during the break-up of...
bordered by Quebec to the north, Nova Scotia to the east, the Gulf of SaintLawrence to the northeast, the Bay of Fundy to the southeast, and the U.S. state...
production cut caused a diplomatic spat with Saudi Arabia, widening the rift between the two countries, and threatening a longstanding alliance. On November...
crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate...
As continental drift reshaped the world, rift valleys formed, including the Cobequid–Chedabucto fault system. During the continental breakup, magma erupted...
Rift to the St. Croix River and the Mississippi. When the glaciers receded, the lake was able to drain through the Great Lakes to the SaintLawrence River...
at the western end of Lake Superior, is the most inland point on the SaintLawrence Seaway and the most inland port in the world. Among the scenic places...