The very strong quake was located about 56 miles (91 kilometers) east southeast of Perryville, Alaska, and occurred around 10:15 p.m. Wednesday night local time, USGS said.
At 29 miles deep (46.7 km), the earthquake is considered shallow. Shallow earthquakes are between 0 and 70 km in depth.
There have been at least two strong aftershocks, including a preliminary magnitude 6.2 and magnitude 5.6, the USGS reports.
A tsunami watch has been issued for Hawaii, according to the National Weather Service Pacific Tsunami Warning Center.
The level of tsunami danger is being evaluated for other US and Canadian Pacific coasts in North America, according to the NWS.
This is a developing story and will be updated.