The largest of the Near Islands are
Attu and
Agattu, which shelter a few
rocks in the channel between them. The other important islands are the
Semichi Islands to their northeast, notable among which are
Alaid,
Nizki, and
Shemya. About to the east-southeast from Shemya are small rocky reefs known as the Ingenstrem Rocks. The total land area of all of the Near Islands is 1,143.785 km2 (441.618 sq mi), and their total population was 47 persons as of the
2000 census. The only populated island is Shemya; the
U.S. Coast Guard station on Attu was decommissioned on August 27, 2010 and the last 20 inhabitants left the island. On July 17, 2017, a major
earthquake with a
moment magnitude scale of 7.7 struck the Aleutian arc, with an epicenter west of Attu. The earthquake produced a measurable
tsunami that was detected at tide gauges across the Pacific ocean; a tide gauge located at
Shemya, Alaska measured a tsunami height of . == History ==