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TitreThe 16 May 1909 Northern Great Plains Earthquake
AuteurBakun, W H; Stickney, M C; Rogers, G C
SourceBulletin of the Seismological Society of America vol. 101, no. 6, 2011 p. 3065-3071, https://doi.org/10.1785/0120110054
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110023
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1785/0120110054
Mediapapier; en ligne; numérique
Formatspdf
ProvinceSaskatchewan
Lat/Long OENS-105.5000 -105.2500 49.0000 14.0000
Sujetssecousses séismiques; études séismiques; magnitudes des séismes; caractéristiques structurales; failles; linéaments; sismicité; géophysique
Illustrationslocation maps; tables
ProgrammeTargeted Hazard Assessments in Western Canada, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
The largest historical earthquake in the northern Great Plains occurred on 16 May 1909. Our analysis of intensity assignments places the earthquake location (48.81° N, 105.38° W) close to the Montana - Saskatchewan border with an intensity magnitudeMI of 5.3 - 5.4. Observations from two seismic observatories in Europe give an average Ms value of 5.3. The 1909 earthquake is near an alignment of epicenters of small earthquakes in Montana and Saskatchewan and on strike with the mapped Hinsdale fault in Montana. Thus, the 1909 earthquake may have occurred on a 300-km-long seismically active fault, which could have seismic-hazard implications for the region, particularly for the hydraulically emplaced earth-filled Fort Peck Dam, constructed in the 1930s on the Missouri River in northeast Montana.
GEOSCAN ID288594