| Titre | Earthquake waves: large earthquakes on the Atlantic coast? Yes - Newfoundland, 1929 |
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| Auteur | Cassidy, J |
| Source | L'Association Canadienne du Génie Parasismique, Bulletin vol. 6, issue 4, 2021 p. 2-3  Accès ouvert |
| Liens | Online - En ligne (complete volume - volume
complet, 209 KB)
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| Liens | The Tsunami of 1929
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| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20210464 |
| Éditeur | Association canadienne du génie parasismique |
| Document | publication en série |
| Lang. | anglais |
| Media | numérique; en ligne |
| Formats | pdf |
| Province | Région extracotière de l'est; Terre-Neuve-et-Labrador; Nouvelle-Écosse; Nouveau-Brunswick; Île-du-Prince-Édouard; Québec; Ontario |
| SNRC | 1; 2; 10; 11; 12; 20; 21; 22; 30N; 31B; 31C; 31F; 31G; 31H; 31I; 31J; 31K; 31N; 31O; 31P; 32A; 32B; 32H |
| Région | Island of Newfoundland; Grand Banks of Newfoundland; Océan Atlantique |
| Lat/Long OENS | -77.0000 -50.0000 52.0000 39.0000 |
| Sujets | secousses séismiques; magnitudes des séismes; dégât causés par les tremblements de terre; tsunami; glissements de terrain; glissements; historique; séismologie; données sismiques; répliques sismiques;
marges continentales; plate-forme continentale; talus continental; milieu côtièr; modèles; Infrastructure; Équipement de communications; Bâtiment; Taux de mortalité; géophysique; tectonique; géologie marine; Sciences et technologie; Nature et
environnement; Santé et sécurité |
| Illustrations | cartes géolscientiques généralisées |
| Programme | Géoscience pour la sécurité publique Risques géologique du tremblement de terre |
| Diffusé | 2021 10 01 |
| Résumé | (disponible en anglais seulement)
Canada has remained quiet in terms of significant earthquakes during the past few months. As a result, this column will again highlight a significant historic
Canadian earthquake - this one along the Atlantic coast. At 5:02 p.m. (Newfoundland time) on November 18, 1929, a M7.2 earthquake occurred approximately 250 km south of Newfoundland along the southern edge of the Grand Banks. This earthquake was felt
as far away as New York and Ottawa (both ~1500 km distant). A number of chimneys were damaged or destroyed on Cape Breton Island (~350 km distant), items were knocked from shelves and some highways were blocked by minor landslides. A few aftershocks
(some as large as magnitude 6) were felt in Nova Scotia and Newfoundland but caused no damage. The most significant and deadly impact of this earthquake was the triggering of a large submarine slump (an estimated volume of 200 cubic kilometres of
material was moved on the Laurentian slope) which ruptured 12 transatlantic cables in multiple places and generated a large tsunami. Southern Newfoundland (especially the Burin Peninsula) bore the brunt of the tsunami, some homes were washed out to
sea and 28 people were killed. Run-up heights of 13+ m were observed in some Newfoundland communities (details at: https://www.heritage.nf.ca/articles/politics/tsunami-1929.php). The tsunami was recorded along the eastern seaboard as far south as
South Carolina, and across the Atlantic in Portugal. Some minor tsunami damage was reported in Bermuda. This earthquake serves as another reminder that rare, damaging earthquakes strike even in those parts of Canada that we don't generally associate
with earthquakes (like the Atlantic coast). It is also a reminder of the 'secondary effects' of earthquakes - it is not just ground shaking that causes damage, but tsunami impacts, liquefaction, landslides, and more. Lessons learned from rare
earthquakes such as this one have been incorporated into our seismic hazard models and National Building codes - but we still have much to learn. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cette rubrique du bulletin résume le séisme et le tsunami de 1929 M7.2 au large de Newfound. Ceci est un rappel pour la communauté des
ingénieurs des grands tremblements de terre destructeurs dans les régions du Canada qui ne subissent pas souvent de tremblements de terre. |
| GEOSCAN ID | 329316 |
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