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A revised magnitude-recurrence relation for shallow crustal earthquakes in southwestern British Columbia; considering the relationships between moment magnitude and regional magnitudes



A revised magnitude-recurrence relation for shallow crustal earthquakes in southwestern British Columbia; considering the relationships between moment magnitude and regional magnitudes



Bulletin of the Seismological Society of America 95(1): 334-340



An important component of seismic hazard analysis is the magnitude-recurrence relation, which provides the cumulative rate of occurrence of earthquakes within a seismic source zone as a function of magnitude. In the national seismic hazard maps developed for the 2005 National Building Code of Canada, the magnitude-recurrence relation for the Cascade Mountains zone of southwestern British Columbia (CASR), the seismic zone in which Vancouver and Victoria are located, is based mainly on earthquakes measured on the local scale M (sub L) (Richter scale), but other scales including body-wave magnitude (m (sub b) ), coda duration magnitude (M (sub c) ), and moment magnitude (M) have been used for some of the events. The mixture of magnitude types is a potential source of bias in the relations. By using data from recently calculated regional moment tensor solutions, a local magnitude-moment magnitude relationship is developed for magnitudes of 2.9

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Accession: 029776458

Download citation: RISBibTeXText

DOI: 10.1785/0120040095


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