Tana is an eroded pair of east–west trending stratovolcanic

cones In geometry, a cone is a three-dimensional figure that tapers smoothly from a flat base (typically a circle) to a point not contained in the base, called the ''apex'' or '' vertex''. A cone is formed by a set of line segments, half-lines, ...

east of the more known Cleveland volcano, and is located on the eastern end of the Chuginadak Island of 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 ...

of 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 ...

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 ...

Geography

Tana sits on the eastern end of Chuginadak Island, which is an island northeast of

Herbert Island Herbert Island (; ) is an island in the Islands of Four Mountains subgroup of the Aleutian archipelago. It is from Chuginadak Island, separated by the Chuginadak Pass. Yunaska Island is west southwest of Herbert Island. Measuring across ...

, south of

Kagamil Island Kagamil Island (; ), in the Islands of Four Mountains subgroup of the Aleutian archipelago, is north of Chuginadak Island and south of Uliaga Island. It is in length and up to in width. The southern half of the island is dominated by the K ...

and southeast of

Carlisle Island Carlisle ( , ; from ) is a city in the Cumberland district of Cumbria, England. Carlisle's early history is marked by the establishment of a settlement called Luguvalium to serve forts along Hadrian's Wall in Roman Britain. Due to its proxim ...

which are all a part of the

. The island consists of 2 main volcanoes, one of them being Tana, and several young

cinder cones A cinder cone or scoria cone is a steep, conical landform of loose pyroclastic fragments, such as volcanic ash, clinkers, or scoria that has been built around a volcanic vent. The pyroclastic fragments are formed by explosive eruptions or lav ...

which make up the thin land strip between the volcano and Cleveland. The nearest center of population is Nikolski, a town in

Umnak Island Umnak (; ) is one of the Fox Islands of the Aleutian Islands. With of land area, it is the third largest island in the Aleutian archipelago and the 19th largest island in the United States. The island is home to a large volcanic caldera on Moun ...

, with a distance of . Tana and Cleveland volcanoes

Geologic setting

Tana is the part of a volcanic arc known as

Aleutian Arc The Aleutian Arc is a large volcanic arc of islands extending from the Southwest tip of the U.S. state of Alaska to the Kamchatka Peninsula of the Russian Federation. It consists of a number of active and dormant volcanoes that have formed as a ...

, which spans across the Aleutian island chain and includes many volcanoes. South of the volcano is the

Aleutian Trench The Aleutian Trench (or Aleutian Trough) is an oceanic trench along a convergent plate boundary which runs along the southern coastline of Alaska and the Aleutian islands. The trench extends for from a triple junction in the west with the Ula ...

, which is trench along the convergent plate boundary where the Pacific Plate subducts under North American Plate which forms the Aleutian Arc and all of its volcanoes. Tana flank

Activity

There is no record of any eruption at a specific date for Tana, however, there are registered active hot springs,

fumaroles A fumarole (or fumerole) is a vent in the surface of the Earth or another rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

and

mudpot A mudpot, or mud pool, is a type of acidic hot spring, or fumarole, with limited water. It usually takes the form of a pool of bubbling mud, as a result of the acid and microorganisms decomposing surrounding rock into clay and mud. Description ...

s within the north and northeastern flank of the volcano which proves that the volcano has shown activity in the Holocene age and is still active. At a study done in 2015, Tana's fumaroles and hot springs were inspected and as a result stable emissions and springs with temperatures of were observed with acidic characteristics.

References

{{reflist Islands of Four Mountains Stratovolcanoes of Alaska Active volcanoes Holocene stratovolcanoes

Geography

Geologic setting

Activity

See also

References