The most powerful appears to be a magnitude 4.1 earthquake that occurred during the filling of the Manic-3 generating station in north-central Quebec in 1975. More recently, hundreds of small quakes were registered when the Romaine 2 dam was filled in 2014. Lamontagne stresses that these were minor earthquakes, falling short of the magnitude 5 level that is generally the threshold for causing damage. “It’s interesting and … mysterious.”In Quebec, the biggest hydroelectric projects have all been completed, with no major new ones on the near horizon. Lamontagne said his research extends beyond Quebec and encompasses “all the history of earthquakes and reservoirs” in order to gather all the knowledge on the subject into a single spot.

Source: National Post October 13, 2018 20:15 UTC