The quake struck about 91 kilometers southeast of Sand Point with a depth of 40.1 kilometers at 12:54 p.m. local time, according to the U.S. Geological Survey.
The tsunami warning covers much of the southern coast of the remote U.S. state, including the thinly populated Alaska Peninsula, according to the National Oceanic and Atmospheric Administration.
The strongest jolt ever recorded in Alaska - and indeed all of North America - came in 1964, with the 9.2 magnitude Good Friday quake, which set off landslides and tsunamis and left 131 people dead, including some as far away as California and Oregon.
A powerful quake in the United States has triggered a tsunami warning, with the National Weather Service urging people to move inland and seek higher ground.
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Sand Point is located on the northwest range of Popof Island.
"You kind of always wait for it to build more, but it just lasted and trailed off", he said. The epicenter was at a depth of 40 kilometers.
The Alaska Earthquake Center said a magnitude 5.2 aftershock was reported 11 minutes later, centred roughly in the same area.
Patrick Mayer, superintendent of the Aleutians East Borough School District, said parents picked up their children from Sand Point School, which also served an evacuation point. Unalaska public safety officials earlier Monday had sent out a release saying they would be conducting tests of the community's tsunami warning sirens. Her coworker didn't feel the quake at all, she said.