The U.S. Geological Survey said the magnitude 7.7. earthquake struck just after 8 p.m. PT Saturday, at a depth of 17 kilometres centred 139 km south of Masset in the Haida Gwaii region.
No major damage or injuries have been reported as a result of the earthquake, which was followed by several aftershocks, the first of which had a magnitude of 5.8.

Forecasters had predicted that a tsunami would hit Langara Island, at the northern tip of Haida Gwaii.
Environment Canada had urged residents in low-lying areas of coastal B.C. to seek higher ground as tall waves lashed the province’s shoreline. CTV British Columbia’s Penny Daflos reported that at least three communities -- Sandspit, Bella Bella and Prince Rupert -- were evacuated as a precaution.
Power outages were reported at some homes, as well.