The U.S. Geological Survey says the magnitude 6.0 quake struck about 1 a.m. Thursday and was centered in the ocean, about 200 miles south of the capital, Juneau.
The Tsunami Warning Center says there is no danger of a tsunami.
The quake was widely felt across the region, according to the Alaska Earthquake Information Center. But it had no immediate reports of any damage.
The center says the quake is an aftershock to a magnitude 7.5 temblor that struck on Jan. 4. That quake sparked a tsunami warning for hundreds of miles along the Alaska and Canadian coasts, but it was cancelled after a few hours when no damaging waves were generated.
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