The1925 Charlevoix–Kamouraska earthquakestruck northeasternNorth Americaon February 28, reaching 6.2 on themoment magnitude scale.[1]It was one of the most powerful measured in Canada in the 20th century,[1]with a maximum perceived intensity of VIII (Severe) on theMercalli intensity scaleat itsepicentrein the area ofCharlevoix-Kamouraskaalong theSaint Lawrence Rivernear île aux Lièvres and not greater than VI (Strong) in the United States.[2]The quake was felt inQuebec City,Shawinigan,andMontrealin Canada, and as far south in the U.S. asVirginia,and as far west as theMississippi River.[3]
 | |
| UTCtime | 1925-03-01 02:19:20 |
|---|---|
| ISCevent | 910394 |
| USGS-ANSS | ComCat |
| Local date | February 28, 1925 |
| Local time | 09:19:20[1] |
| Magnitude | 6.2Mw |
| Depth | 10 km (6 mi) |
| Epicenter | 47°48′N69°48′W/ 47.8°N 69.8°W |
| Areas affected | Canada |
| Max.intensity | MMI VIII (Severe) |
| Aftershocks | 55 |
Damage
editIt caused damage in three separate areas. The first had extreme damage constricted to a narrow belt 20 miles (32 km) long on both shores of theSaint Lawrence Rivernear the epicentre.[4]In this area, damage at the villages ofBaie-Saint-Paul,Saint-Urbain,Les Éboulements,Pointe-au-Pic,La Malbaie,Tadoussacand the other nearby villages ofSainte-Anne-de-la-Pocatière,Saint-Pacôme,Rivière-Ouelle,Saint-Philippe,Saint-Denis,andSaint-Pascalon the south shore, was mostly related to the magnitude of the earthquake itself, and to some extent by the deep grainy soil on which many of the destroyed buildings were built.[4]The two other damaged areas wereQuebec Cityand in theTrois-Rivières–Shawiniganarea, where the destruction was more extensive, not so much due to the strength of the earthquake, but rather to the uneven nature of the landscape.[4]
Aftermath
editA total of 55aftershockswere recorded, which lasted for weeks, ranging from magnitude 5 to 2.[5]Over the years, several studies were published on the 1925 Charlevoix–Kamouraska earthquake, some as recently as 1999.[1]Aforeshockoccurred in the St. Lawrence valley the prior year on September 30. It was rated at 6.1 and was felt fromRockland, OntariotoPortland, Maine.[6]
See also
editReferences
edit- ^abcd"The 1925 Charlevoix-Kamouraska earthquake".Natural Resources Canada.Retrieved2012-03-04.
- ^Coffman & von Hake 1970,p. 10
- ^"Intensity of the 1925 Charlevoix-Kamouraska Earthquake".Natural Resources Canada.Archived fromthe originalon 2012-07-07.Retrieved2012-03-04.
- ^abc"Damage caused by the 1925 Charlevoix-Kamouraska earthquake".Natural Resources Canada.Archived fromthe originalon 2013-01-01.Retrieved2012-03-04.
- ^"Aftershocks from the 1925 Charlevoix-Kamouraska earthquake".Natural Resources Canada.Archived fromthe originalon 2012-07-08.Retrieved2012-03-04.
- ^Coffman & von Hake 1970,pp. 11, 15
- Bibliography
- Coffman, Jerry L.; von Hake, Carl A., eds. (1970),Earthquake History of the United States Publication 41-1,United States Department of Commerce/United States Department of the Interior,p. 277
External links
edit- TheInternational Seismological Centrehas abibliographyand/orauthoritative datafor this event.
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