The second one was much shallower at a depth of 6 miles and was 122 miles south west of Port Hardy.
Three earthquakes measured at magnitudes of anywhere between 6.5 and 6.8 struck off Vancouver Island on Sunday night.
The USGS did not predict damage from the quakes, forecasting they would be felt only lightly. No injuries were reported, she said.
According to a tweet released by the US National Tsunami Warning Center, a government agency that monitors and issues tsunami information for the continental US and Canada, no tsunami is expected.
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British Columbia, namely Vancouver Island, has been struck by powerful earthquakes in the past.
Survey geophysicist Zachary Reeves said all three quakes occurred in the same general area over the course of about an hour, and at a shallow depth of approximately 10 kilometres.
Scientists think that region is overdue for a massive natural disaster, on the scale of 9.0 or greater.
The earthquakes centered about 355 miles northwest of Seattle.
"This geologically active region, the Cascadia Subduction Zone, not only hosts erupting volcanoes but also produces megathrust earthquakes capable of generating devastating, ocean-crossing tsunamis".