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TitleEarthquakes of the St. Lawrence Valley between Montreal and Québec: focal depth determination from Regional Depth Phases for the magnitude 2.8 and larger earthquakes for the time period 1980-2014
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AuthorMa, S; Lamontagne, M
SourceGeological Survey of Canada, Open File 8145, 2017, 20 pages, https://doi.org/10.4095/304228
Year2017
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; jpg
ProvinceQuebec
NTS21E; 21L; 31H; 31I
AreaSt. Lawrence Valley; St. Lawrence River; Québec; Montreal
Lat/Long WENS -75.0000 -70.0000 47.0000 44.5000
Subjectsgeophysics; earthquakes; seismology; seismic risk; seismicity; seismic zones; earthquake foci; earthquake risk; modelling; 2013-05-17 MN 5.2 Ladysmith earthquake; Regional Depth Phase Method (RDPM); geological hazards; focal depth
Illustrationstables; schematic representations; seismograms; location maps; profiles
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramAssessing Earthquake Geohazards, Public Safety Geoscience
Released2017 07 24
AbstractThis Open File describes how the focal depths of 62 earthquakes with magnitude (MN) ? 2.8 were calculated with the Regional Depth Phase Method (RDPM). The earthquakes occurred between 1980 and 2014 in the St. Lawrence Valley between Montreal and Quebec City. Nine of these 62 earthquakes are foreshocks, aftershocks or earthquake swarms. For the 53 independent events, more than 50% occurred between 10 and 15 km depth. Only 10% of the hypocentres are below 20 km, but that includes the two largest events of the period (MN 4.1 and 5.1). Shallow events (depth less than 5 km) represent only 5% of all SLV events.
Summary(Plain Language Summary, not published)
This Open File Report describes the focal depth distribution of some 62 earthquakes with magnitude (mN) 2.8 and higher that occurred between 1980 and 2014 in the St. Lawrence Valley between Montreal and Quebec City. More than 50% occurred between 10 and 15 km depth, 5% at less than 5 and 10% deeper than 20 km where the two largest earthquakes of the period occurred.
GEOSCAN ID304228