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| Goal of the report | This report descibes the earthquakes recorded by the seismograph stations of the Lower-Saint-Lawrence/North-Coast, (MNQ, ICQ, CNQ, SMQ) et de Grosses-Roches (GSQ), between January 1st and December 31, 1998. |
| Performance of the local network |
The Lower-Saint-Lawrence-Northern-Coast region is
monitored by a local network of 5 CNSN stations: MNQ (Manicouagan), CNQ(Côte-Nord), ICQ (Islets-Caribou) et SMQ (Sainte-Marguerite).
The uptime for these stations was very acceptable in 1998, ranking over 90%. Data from this station is continuously archived on optical disk Taking into account the distribution of stations in the Canadian network, any event with magnitude 2.0 or higher would be located. |
| Recorded earthquakes |
About 103 earthquake were recorded as shown in the map and described in the list.
Besides some isolated and low magnitude events, the large majority of them occurred inside the recognized seismic zone of the Low-Saint-Laurent. The 22nd of october 1998, an earthquake exceeded magnitude 4.0. It was followed by numerous aftershocks in the days after the main shock. The 25th of march 1998, an earthquake reached a magnitude of 3.5 but wasn't felt being too weak and far from the coast. |
| Felt earthquakes | According to the reports of citizens and journalists, four of these earhquakes were felt locally. |
| Blasts | Many explosions related to work of the Sainte-Marguerite project (SM-C3) were detected. Their nature was confirmed by Hydro-Quebec with Bay-Comeau or their characteristic signatures. These explosions do not appear on the map and list above. |
| Induced earthquakes | No earthquake induced by the water level variations was recorded during the time period. |
Retour: Earthquakes in Quebec and in the surrounding areas in 1998
Author: Maurice Lamontagne, ing.
File: GS-2140-4
