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A powerful magnitude 7.7 earthquake struck central Moresby Island in the Haida Gwaii archipelago at 8:04PM PDT, 27 October 2012. Residents along the west coast—from Alaska to Vancouver—also felt several aftershocks up to magnitude 5.8. However, no major damage or injuries were reported. This was the largest temblor to hit Canada since 1949, when an 8.1-magnitude quake hit west of the Queen Charlotte Islands, in the same area.
Our seafloor hydrophones picked up the low-frequency rumbles from this earthquake, along with the calls of humpback whales in the area. This recording is from a hydrophone on Barkley Upper Slope, positioned at a depth of 396 m. In this clip, sound has been sped up 250% to make the earthquake noise audible to the human ear. The squeaking noises prior to the main quake are the sped-up whale calls.
