A powerful 7.7 magnitude earthquake has shaken the north-central coast of British Columbia, triggering a tsunami warning.
The quake was felt on Vancouver Island, the Haida Gwaii area, Prince Rupert, Quesnel and Houston, but so far there have been no reports of damage.
The Geological Survey of Canada says a tsunami warning has been issued for much of the west coast of Vancouver Island, and extends all the way north to Alaska.
Tsunami warning sirens have sounded in Tofino.
The warning means all residents in the warning area should move immediately inland to higher ground.
The quake struck just after eight o'clock local time, its epicentre 17 kilometres below ground about 200 kilometres south-southwest of Prince Rupert.
It was quickly followed by several aftershocks above magnitude five.
A small tsunami, below 30 feet, has been detected in south-east Alaska. Tsunami warnings remain in effect for coastal BC, from north tip of Vancouver Island to Cape Decision, SE of Sitka Alaska.
This earthquake is likely associated with relative motion across the Queen Charlotte fault system offshore of British Columbia, Canada. Studies of tectonics in this region suggest plate motions are taken up by strike slip faulting parallel to the plate boundary, accompanied by lesser amounts of thrust motion to accommodate the oblique nature of the plate motion vector between the two plates with respect to the main plate boundary fault structure. It is not clear whether this oblique component of plate motion involves underthrusting of the western edge of the Pacific Plate beneath North America, or whether such motions are taken up on crustal faults. The October 28th earthquake is consistent with either scenario.
Global BC Facebook followers report feeling the initial quake from Prince George, Kitimat, Fraser Lake. One person noted her dog 'freaked out' before she felt a mild tremor.
One of our Facebook users said she felt a small shudder in Bella Coola, BradinWL.