Abstract

On 5 November 1973 at 12 h 36 m 17 s UT, a shallow focus earthquake (ML = 4.7, mb = 4.2) occurred about 20 km southwest of Terrace, British Columbia near 54.4 °N and 128.8 °W. The area has been aseismic in historic time. The earthquake appears to have no relation to nearby hot springs or to the geologically recent volcanism in the area. It was felt to distances of 120 km and the maximum intensity observed was V on the Modified Mercalli scale. Only minor damage was reported. The inclusion of this earthquake in seismic risk calculations slightly elevates the risk computed for Terrace.

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