The National Oceanic and Atmospheric Administration's National Weather Service says the quake's epicenter was approximately 150 kilometres northwest of Port Alice, on Vancouver Island. It also said a tsunami was not expected.
The area of the ocean floor west and north of B.C., often referred to as the Pacific Ring of Fire, is known for its seismic activity.
Natural Resources Canada rated the quake 6.1 magnitude, and published a short statement saying there were no reports of damage or it being felt by residents, and none would be expected. .
On Monday, a much smaller 3.9 magnitude earthquake registered approximately 119 kilometres southwest of Port Alice, according to Earthquakes Canada.
Further to the northwest, a much large 7.0 quake shook off the coast of Adak, one of Alaska's Aleutian Islands last week.