The underwater quake hit off the Fox Islands, by the Aleutian Trench, more than 1,500 kilometers (1,000 miles) west of Anchorage, the US Geological Survey (USGS) said.
The quake had a depth of 11 kilometers and struck at 5:49 pm (0449 GMT Monday), USGS said. The National Tsunami Warning Center noted the quake but did not issue an alert and nor did the Pacific Tsunami Warning Center.