A major earthquake with a preliminary magnitude of 7.3 initially triggered a tsunami warning for the southern Alaska Peninsula. It was later downgraded to an advisory.

Just after the quake, NOAA's National Tsunami Warning Center issued Tsunami Warnings for the immediate Alaska coastline from Kennedy Entrance to Unimak Pass, including all of Kodiak Island, Chignik and Cold Bay. The U.S. Coast Guard reported it evacuated personnel from its base at Kodiak to higher ground and had two air crews stand ready to assist.