Editing Bas-Saint-Laurent (section)

=== Seismicity ===
{{Main|Charlevoix Seismic Zone}}
The estuary of the Saint Lawrence river in front of the [[Charlevoix]] region is one of the most active seismic regions in the east of Canada. Five [[earthquake]]s of a magnitude superior to 6 have occurred in history, in February 1663, December 1791, October 1860, October 1870 and February 1925.<ref name="NG_423">{{cite book |last1=Landry |first1=Bruno |last2=Mercier |first2=Michel |title=Notions de géologie |date=1992 |publisher=Modulo |location=Ville Mont-Royal, Quebec |isbn=2-89113-256-4 |language=fr}}</ref> The distribution of these earthquakes indicates a concentration in the estuary, near [[La Malbaie]] and [[Rivière-du-Loup]].<ref name="ZSC">{{cite web |author1=Canada |title=Earthquake zones in Eastern Canada |url=http://www.seismescanada.rncan.gc.ca/zones/eastcan-fr.php |website=Ressources naturelles Canada |access-date=11 December 2018 |date=23 November 2011}}</ref>

Surveys and the establishment of a [[seismometer]] network were conducted in the 1970s and allowed to circumscribe the seismically active area in an area of {{convert|30|km|abbr=on}} on {{convert|85|km|abbr=on}} along the Saint Lawrence River, this zone includes the towns of La Malbaie, [[Baie-Saint-Paul]] and [[La Pocatière]]. The seismic data indicates that an earthquake happens on average every 36 hours in the Charlevoix-Kamouraska zone. They are concentrated in the Precambrian bedrock under the Logan line and the [[Appalachian Mountains]], at a variable depth between {{convert|30|km|abbr=on}} deep and the surface<ref name="ZSC" />

Another seismic area located in the [[Gulf of Saint Lawrence]], in a triangle between the towns of [[Matane]], [[Baie-Comeau]] and [[Sept-Îles, Quebec|Sept-Îles]]. However, this seismic area is less active than the one uphill, as only an average of sixty earthquakes occur each year and has not had a destructive earthquake in history. An earthquake of magnitude 5.1 occurred in 1944 east of [[Godbout]] and another of the same magnitude occurred on the 16 March 1999, its epicentre was located at about {{convert|60|km|abbr=on}} south of Sept-Îles.<ref name="ZSC" /><ref name="NG_423"/>