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Alagogshak crater AVO.jpg
Alagogshak summit in 1997
Highest point
Elevation 5,495 ft (1,675 m)
Location Katmai National Park and Preserve, Alaska, U.S.
Parent range Aleutian Range
Topo map USGS Adak C-2
Mountain type Stratovolcano
Volcanic arc/belt Aleutian Arc

Alagogshak is a stratovolcano, located on the Alaska Peninsula, United States, in Katmai National Park and Preserve. It is the oldest of the volcanoes in the vicinity of the Valley of Ten Thousand Smokes. The volcano was recognized as a separate feature from Mount Martin in 1997. The Holocene Mount Martin stands partly on Alagogshak's deeply eroded edifice, about 3 kilometres (1.9 mi) northeast of the Alagogshak vent. Alagogshak was last active in Pleistocene time, and was active from about 680,000 years before present to about 43,000 years before present. The remnant summit crater consists of hydrothermally altered rock. It is the only member of the Katmai volcanic group that is no longer active.

Map of Alaska Peninsula Volcanoes
Map showing volcanoes of Alaska Peninsula.
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