Two strong earthquakes -- the first measuring 6.6 magnitude, the second 6.8 -- struck in quick succession off Canada’s west coast late Sunday, the US Geological Survey said.

The epicentre of the first tremor, at 10:39pm (0549 GMT Monday), was located about 135 miles (218 kilometers) southwest of Port Hardy -- a small municipality on the north-eastern tip of British Columbia’s Vancouver Island.

The second stronger quake occurred 122 miles south-west of the same town more than half an hour later, at 11:16pm.

There were no initial reports of damage or injuries, and no tsunami warnings were issued.

The region is located near the Cascadia subduction zone, a mammoth fault line that lies offshore, stretching from northern Vancouver Island to Northern California in the United States.

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