2021 M8.2 Chignik Earthquake

At 10:21 p.m., based on the size and location of this earthquake, the National Tsunami Warning Center issued a tsunami warning for South Alaska and the Alaska Peninsula, from Hinchinbrook Entrance (90 miles E of Seward) to Unimak Pass (80 miles NE of Unalaska), and for the Aleutian Islands from Unimak Pass to Samalga Pass (30 miles SW of Nikolski). The NTWC also issued tsunami warnings for Southeast Alaska, and other regions of South Alaska and the Aleutian Islands not covered in the warning.

A number of communities issued evacuations, including Chignik Bay, Chignik Lagoon, City of Kodiak, False Pass, Homer, King Cove, Nelson Lagoon, Old Harbor, Sand Point, Seward, and Unalaska.

The NTWC cancelled the tsunami warnings and advisories about 1:30 a.m. Alaska time. Wave height measurements at the time of the cancellation were:

Sand Point, AK    0042  PDT Jul 29    0.5 ft
King Cove, AK     0109  PDT Jul 29    0.4 ft
Unalaska, AK       0205  PDT Jul 29   0.3 ft
Kodiak, AK          0127  PDT Jul 29   0.5 ft
Old Harbor, AK   0205  PDT Jul 29    0.7 ft
Alitak Bay, AK     0142  PDT Jul 2     0.4 ft