GEOSCAN Search Results: Fastlink


TitleA revised moment magnitude catalog of eastern Canada's largest earthquakes
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBent, A L
SourceGeological Survey of Canada, Open File 8862, 2022, 34 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; xlsx (Microsoft® Excel®)
ProvinceNewfoundland and Labrador; Prince Edward Island; Nova Scotia; New Brunswick; Quebec; Ontario; Nunavut; Saskatchewan; Manitoba; Northwest Territories; Eastern offshore region; Northern offshore region
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 120; 340; 560
AreaCanada; United States of America; Greenland; Denmark
Lat/Long WENS-110.0000 -45.0000 85.0000 37.5000
Subjectsgeophysics; Science and Technology; Nature and Environment; Health and Safety; seismology; earthquakes; earthquake catalogues; earthquake magnitudes; earthquake foci; seismicity; seismic risk; earthquake risk; National Earthquake Database (NEDB); Natural hazards
Illustrationstables; location maps; histograms
ProgramCanadian Hazard Information Service Canadian Hazard Information Service Management
Released2022 02 15
AbstractAlthough there are many scales used to calculate earthquake magnitude, moment magnitude is currently considered the preferred magnitude scale for use in seismic hazard assessment in Canada. Historically, moment magnitude was not determined for eastern Canadian earthquakes although it has been routinely calculated for earthquakes of approximately magnitude 4.0 and greater, on regional magnitude scales, for the last decade. Thus, most moment magnitudes for eastern Canadian earthquakes must be obtained by converting from another magnitude scale or from felt information. This paper provides a moment magnitude catalog for the largest earthquakes in eastern Canada and vicinity. The study derives moment magnitudes for some events but also makes use of values from the published literature. Earthquakes are assessed individually using all available sources of information. The resulting catalog provides moment magnitudes for 254 events. Three additional events were evaluated but removed from the catalog as it is highly questionable whether they were earthquakes.
Summary(Plain Language Summary, not published)
Although there are many different magnitude scales used to measure the size of earthquakes, moment magnitude is currently the preferred magnitude scale for use in seismic hazard assessments as it is the most reliable at high magnitudes. Because it is a newer magnitude scale and not easy to calculate for small earthquakes, many other magnitudes appear in the national earthquake catalog. This paper makes use of all available evidence and determines moment magnitude for over 250 of the largest earthquakes in eastern Canada and provides them in a format that may be used by others for hazard assessments and other research.

Date modified: