Three relatively strong earthquakes were recorded Sunday night in the Pacific Ocean off Vancouver Island.
All six quakes were between 6 miles and 11 miles deep, according the PNSN website.
A magnitude 6.8 natural disaster struck northwest of Canada's Vancouver Island late Sunday, according to the United States Geological Survey.
There was no tsunami threat, the Pacific Tsunami Warning Center said.
According to the CBC, there were no immediate reports of damage or injuries.
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The tremors hit the Canadian province of British Columbia, which lays on the notorious Ring of Fire.
The epicenter of the first 6.6 tremor, at 10.39pm (0549 GMT Monday), was located 135 miles (218km) southwest of Port Hardy - a small municipality on the northeastern tip of British Columbia's Vancouver Island - and 355 miles northwest of Seattle.
Earlier this year, a report said that a 9.0 quake could hit off the West Coast of Canada, which would kill thousands of people and cause massive tsunami waves around the West Coast.
"Almost all the world's most explosive and risky volcanoes are located here, along with the some of the longest and most deadly quake faults".
"This geologically active region, the Cascadia Subduction Zone, not only hosts erupting volcanoes but also produces megathrust earthquakes capable of generating devastating, ocean-crossing tsunamis".