In Alaska, the National Tsunami Warning Centre (NTWC) issued warnings for southern parts, the Peninsula, and Pacific coastal areas from Hinchinbrook Entrance to Unimak Pass.
The Pacific Tsunami Warning Centre (PTWC) issued a warning for the US state of Hawaii and the US Pacific territory of Guam.
The NTWC said that it was evaluating the level of tsunami danger for other US and Canadian Pacific coastal areas.
The European-Mediterranean Seismological Centre (EMSC) estimated the quake at a magnitude of 8.0 and a depth of 10km.
The USGS had earlier pegged the magnitude of the quake at 7.2.