The first quake, which measured 4.2 ML, struck just south of the border in Idaho around 10:43 p.m PT Thursday. It was felt in the Kootenay communities of Castlegar and Creston.
It was one of three small quakes in the area since Thursday night, according to the U.S. Geological Survey.
The second quake, which was measured as 6.1 ML by Earthquakes Canada (M6.2 by the USGS) struck in the ocean just off the southern tip of Haida Gwaii at 6:56 a.m. PT Friday.
The quake was felt on Haida Gwaii and along the North Coast, but there was no damage reported and no tsunami warning was issued.
The Haida Gwaii earthquake was near the junction of three of the earth's tectonic plates, where earthquakes are common. As recently as Tuesday, a 3.6 ML earthquake was reported in the same region.