The first quake struck off at 6.39am BST, while the second one went off at the same location at 7.16am BST.
Six minutes later, a third 6.5 magnitude tremor was registered 138 miles southwest of Port Hardy - before a weaker 4.9 quake was recorded in the same place 14 minutes after that.
Duke and Duchess of Sussex want a 'normal' life for their child
Update! #meghan WILL got to Fraser Island but WONT do any engagements there... a good walk on the beach could be just the ticket. The "uneven terrain" on Fraser Island, where Harry is set to explore, could cause Meghan difficulty so she is going to skip it.
There were no immediate reports of casualties or damage from the quakes, the first of which struck just before 11 p.m. PT, around 190 km southwest of Port Hardy, a town on the northeast end of Vancouver Island.
Geophysicist Amy Vaughan says the three larger quakes ranged from magnitude 6.5 to 6.8 and that there were possibly some smaller ones as well as some aftershocks.
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There was no initial word on damage or injury resulting from the quakes. No tsunami warning has been issued by the USGS. In 1946, a 7.5 magnitude natural disaster struck the island, and it was felt as far away as Portland, Oregon. "We do know it's occurred about 20 times in the past 10,000 years", Dr. John Clague, an earth sciences professor at Simon Fraser University, said to GlobalNews.
The affected region is located near the Cascadia subduction zone.
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Scientists think that region is overdue for a massive quake, on the scale of 9.0 or greater.