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TitleMoment magnitude (Mw) conversion relations for use in hazard assessment in eastern Canada
AuthorBent, A L
SourceSeismological Research Letters vol. 82, no. 6, 2011 p. 984-990,
Alt SeriesEarth Sciences Sector, Contribution Series 20110070
Mediapaper; on-line; digital
File formatpdf
ProvinceNew Brunswick; Nova Scotia; Nunavut; Quebec; Ontario
NTS21; 22; 23; 4; 25; 26; 27; 31; 32; 33; 34; 35; 36; 37; 38; 39; 41; 42; 43; 44; 45; 46; 47; 48; 49; 120; 340; 560
Lat/Long WENS-110.0000 -60.0000 80.0000 40.0000
Subjectsgeophysics; earthquakes; earthquake risk; seismic interpretations; seismic risk; seismicity; earthquake magnitudes; geological hazards
Illustrationslocation maps; tables; plots
ProgramCanadian Hazard Information Service, Canadian Hazard Information Service
AbstractTo be unbiased and uniform across a wide geographical area, seismic hazard assessments based primarily on earthquake recurrence rates require that the same magnitude scale be used for all earthquakes evaluated. Increasingly, moment magnitude, MW, is seen as the magnitude of preference. Moment magnitude, however, was not routinely calculated in the past for earthquakes in Canada, necessitating the conversion from other magnitude types in common use. This step is complicated by the fact that several magnitude scales are routinely reported for Canadian earthquakes with the choice being influenced primarily by geography and to a lesser extent by the size of the earthquake. This paper focuses on eastern Canada, where mN is the most commonly used magnitude scale. Conversions to MW are established and evaluated. The simple conversion of applying a constant is sufficient. However, the conversion is time dependent with the constant changing from 0.41 to 0.53 in the mid-1990s.