Abstract

Based on damage, felt reports, and the number of instrumental observations, the February 4, 1918 earthquake in east-central British Columbia has in the past been assigned a location near Revelstoke and a magnitude of about 5. It is the largest historical earthquake that has occurred in the eastern part of the Canadian Cordillera. Re-examination of this earthquake using seismograms from Spokane (SPO), Saskatoon (SAS), and Ottawa (OTT), along with newspaper reports, indicates that the event was located approximately 150 km north of Revelstoke with a magnitude graphic of 5.6 to 6.1. Examination of this and more recent events indicates that the Lg phase, which in general is not well observed at Cordilleran stations, may efficiently propagate along strike in this region.

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