Surveys and the establishment of a seismometer network were conducted in the 1970s and allowed to circonscribe the seismically active area in an area of 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 Charlevois-Kamouraska zone. They are concentrated in the precambrian bedrock under the Logan line and the Appalachian Mountains, at a variable depth between deep and the surface