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TitleEarthquakes in eastern Canada: a threat that can be mitigated
AuthorLamontagne, MORCID logo
SourceProceedings of the 4th Canadian conference on geohazards : from causes to management/Comptes rendus de la 4e Conférence canadienne sur les géorisques: des causes à la gestion; by Locat, J (ed.); Perret, D (ed.); Turmel, D (ed.); Demers, D (ed.); Leroueil, S (ed.); 2008 p. 13-24
Alt SeriesEarth Sciences Sector, Contribution Series 20080001
Meeting4th Canadian Conference on Geohazards; Québec City; CA; May 20-24, 2008
ProvinceBritish Columbia; Ontario; Quebec; Nova Scotia; New Brunswick; Eastern offshore region; Newfoundland and Labrador
NTS21G/03; 21I/02; 21M/08; 21M/09; 21O/02; 22D/03; 31G/02; 31H/11; 31J/12; 31L/14; 35A/04; 92C; 95K/08
AreaMont-Laurier; Ungava Peninsula; Saguenay; Nahanni River; Miramichi Highlands; Témiscaming; Cornwall; Laurentian Slope; Charlevoix; Kamouraska; Passamaquoddy Bay; Moncton; Montreal
Lat/Long WENS-56.5000 -55.5000 44.7500 44.2500
Lat/Long WENS-68.0000 -64.0000 47.5000 44.7500
Lat/Long WENS-72.0000 -70.0000 48.5000 47.0000
Lat/Long WENS-80.0000 -72.0000 47.0000 45.0000
Lat/Long WENS-73.5000 -73.5000 60.2500 60.0000
Lat/Long WENS-125.5000 -124.5000 48.7500 48.5000
Lat/Long WENS-124.5000 -124.0000 62.5000 62.2500
Subjectsengineering geology; geophysics; earthquakes; earthquake studies; earthquake risk; earthquake mechanisms; earthquake magnitudes; earthquake foci; earthquake damage; landslides; tsunami; slump structures; slope failures; slope stability; slope stability analyses; seismicity; seismic risk; seismology; seismic zones; health hazards; Cascadia Subduction Zone; geological hazards
AbstractIn Eastern Canada, some earthquakes can be considered significant, i.e. they caused some damage to buildings or had an impact on the natural environment (landslides, rock falls, surface faulting, liquefaction, submarine slumping, rock avalanches, railroad embankment slides, and tsunami). Together with smaller magnitude earthquakes, these larger events have been used to define magnitude-frequency rates for the seismically active zones of Eastern Canada. These rates and the attenuation of seismic waves are used to compute values of ground motions at different probability levels which define the earthquake hazard for eastern Canada, i.e. the probability of an earthquake occurring with a given level of ground motion. Our society demands more than seismic hazard: it requires that we assess the potential impact of earthquakes. For this reason, Natural Resources Canada, in partnerships with universities and local governments, has defined two projects to examine the potential for amplification of seismic ground motions in the Ottawa and Quebec City regions. Using geotechnical properties of in situ deposits, ratios of horizontal to vertical background noise and ground motions recorded on unconsolidated deposits versus bedrock, microzonation maps are being defined.

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