Several powerful earthquakes have been reported near Vancouver Island, Canada, including a magnitude 6.8.
Geophysicist Amy Vaughan told The Associated Press that there may have been some other aftershocks.
Earthquakes Canada has since downgraded the quake to 6.5-magnitude, with no initial reports of tsunami threats, damage or shaking being felt.
The Ring is a huge are in the basin of the Pacific Ocean and is said to be the location for 90 per cent of the world's earthquakes. Two people died in the quake, which also caused severe damage in the area. "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 quake caused a tsunami that hit the east coast of Japan. Tsunamis were not expected after the events.
"Almost all the world's most explosive and unsafe volcanoes are located here, along with the some of the longest and most deadly natural disaster faults".
The first-of-its kind warning sensors developed by Ocean Networks Canada is installed along the Cascadia subduction zone and when fully operating next March will be able to estimate location and magnitude of a megathrust quake.