The Geological Survey of Canada says the latest tremor was centred 96 kilometres southwest of Queen Charlotte City, and was felt in that community at 8:56 p.m. PT. It was followed by a 4.1 aftershock at 11:34 pm.
Earlier in the day a magnitude 6.4 earthquake was detected about 250 kilometres off the coast of Alaska at 12:42 p.m. PT, but that one was not linked to the Haida Gwaii earthquake last month.
Alison Bird, an earthquake seismologist with the Geological Survey of Canada who was in nearby Massett informing people about what can be expected in the wake of the 7.7 quake, said the latest quake was likely an aftershock linked to the large tremour felt across the region on Oct 27.
"We haven't seen earthquakes in this area before. We're seeing them now. They are probably part of the aftershock. The fact that these aftershocks are happening very frequently — several an hour — and we never saw them before, so they are definitely associated with the main shock," said Bird.
According to Earthquakes Canada more than 30 aftershocks have been detected off the west coast of Haida Gwaii since Oct. 27. The strongest aftershock was a 6.3 on Oct 28.
New Tsunami warnings online
Meanwhile on Monday Justice Minister Shirley Bond announced that the provincial government is updating the way tsunami alerts are broadcast over the internet by emergency officials, following criticism of the slow response following last month's quake.
Emergency officials in B.C. will now immediately forward by email any alerts issued by the West Coast and Alaska Tsunami Warning Centre to local authorities, first responders and the media.
After the emails go out, the agency will post information on Twitter and the Emergency Info B.C. website.
Bond says she expects to receive feedback from municipal leaders about the tsunami-alert system within the next month and her ministry will continue to implement changes along the way.