Chagulak Island (also spelled ''Chugul'', ''Chugula'', ''Chegoula'', or ''Tchougoulok''; ) is a small, uninhabited

volcanic A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often fo ...

island in the

Islands of Four Mountains The Islands of Four Mountains () is an island grouping of the Aleutian Islands in Alaska, United States. The chain includes, from west to east, Amukta Island, Amukta, Chagulak Island, Chagulak, Yunaska Island, Yunaska, Herbert Island, Herbert, C ...

group in the

Aleutian Islands The Aleutian Islands ( ; ; , "land of the Aleuts"; possibly from the Chukchi language, Chukchi ''aliat'', or "island")—also called the Aleut Islands, Aleutic Islands, or, before Alaska Purchase, 1867, the Catherine Archipelago—are a chain ...

of southwestern

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. The -wide island consists of a single cone that reaches an elevation of 3,747 ft (1,142 m). Chagulak is a

stratovolcano A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with ...

and is separated from the nearby

Amukta Island The undissected stratovolcano of Amukta volcano makes up most of nearly circular, 7.7-km-wide Amukta Island (Amuux̂tax̂ in Aleut). It is the westernmost of the Islands of Four Mountains chain. The nearest islands to it are Yunaska and Seguam I ...

by a channel about wide; though the two islands are joined underwater. No eruptions have been recorded and very little is known about the volcano, as the only study done on Chagulak so far is a single chemical analysis of a "low-potassium, high-alumina

basaltic andesite Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite. It is composed predominantly of augite and plagioclase. Basaltic andesite can be found in volcanoes around the world, including in Central Ameri ...

" from the north shore.

Gallery

File:Chagulak Island.jpg, File:Alaska Maritime National Wildlife Refuge; Chagulak Island in the Aleutian Islands.jpg, File:Coastal view of Chagulak Island in Alaska with fog in the horizon.jpg, File:Panoramic view of Chagulak Island field crew in 1990.jpg,

References

Islands of Four Mountains Uninhabited islands of Alaska Islands of Alaska Islands of Unorganized Borough, Alaska Volcanoes of Alaska Holocene stratovolcanoes {{AleutiansWestAK-geo-stub