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TitreFocal depth of earthquakes of the St. Lawrence Valley based on crustal phases recorded within 100 km epicentral distance
TéléchargerTéléchargements
AuteurLamontagne, M
SourceCommission géologique du Canada, Dossier public 8032, 2016, 25 pages, https://doi.org/10.4095/299138
Année2016
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/299138
Medianumérique; en ligne
Formatspdf
ProvinceQuébec
SNRC21L/05; 21L/11; 21L/12; 21L/13; 21L/14; 21L/15; 21L/16; 21M/02; 21M/03; 21M/04; 31I/01; 31I/02; 31I/07; 31I/08; 31I/09; 31I/10; 31I/16; 31H; 31G/01; 31G/02; 31G/07; 31G/08; 31G/09
Lat/Long OENS -73.0000 -67.5000 49.5000 46.0000
Sujetsrisque sismique; sismicité; zones sismiques; epicentres; risque de tremblement de terre; secousses séismiques; catalogues des tremblements de terre; milieux marins; sédiments marins; bathymétrie; Zone sismique de Charlevoix ; Zone sismique du bas du Saint-Laurent; géologie marine; géophysique
Illustrationslocation maps; tables; graphs
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeOuest du Canada, risque géoscience, Géoscience pour la sécurité publique
Diffusé2016 10 06
Résumé(disponible en anglais seulement)
We have computed the focal depth of 53 earthquakes of the St. Lawrence Valley (defined as latitudes 45oN to 47oN and longitudes 70oW to 75oW) between Montreal and Quebec City using a minimum of six Pg and Sg phases from three seismograph stations or more located within 100 km of each epicentre. In addition, the epicentre had to be within the polygon defined by the seismograph stations (i.e. the azimuthal gap had to be less than 180o). Although all 607 events of the period 1980-2015 inclusively were considered, the majority of selected events were in the period 2013-2015 when the USARRAY stations occupied the region of interest. Computer scripts were written to select phases, stations and solutions that met our criteria. All resulting hypocentres locate between 10 and 21 km focal depth. Only 2 % of the 607 events had an Rg phase that suggests a focal depth of less than 5 km. Together with hypocentres computed with other methods such as the Regional Crustal Depth Determination, these new hypocentres help determine the crustal levels susceptible to fault reactivation.
Résumé(Résumé en langage clair et simple, non publié)
La profondeur du foyer de 53 séismes de la Vallée du Saint-Laurent ont été calculés.
GEOSCAN ID299138