Saint Lawrence rift system
The Saint Lawrence rift system is a
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]
See also
- 1944 Cornwall–Massena earthquake – Earthquake near the New York–Ontario border
- List of earthquakes in Canada
References
- ISBN 978-0-662-29890-8. M44-2001/D15E-IN.
- Bibcode:2004AGUSM.S14A..02M. Abstract #S14A-02.
- .
- ^ "Earthquakes in southeastern Canada" (PDF). Earthquakes Canada. Natural Resources Canada. Retrieved 17 April 2020.