 They are concentrated in the precambrian bedrock under the Logan line and the Appalachian Mountains, at a variable depth between deep and the surface

Another seismic area located in the Gulf of Saint Lawrence, in a triangle between the towns of Matane, Baie-Comeau and 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 south of Sept-Îles.