Alagogshak

Location in Alaska

LocationKatmai National Park and Preserve, Alaska, USAParent rangeAleutian RangeTopo mapUSGS Mount Katmai A-5GeologyAge of rockPleistoceneMountain typeStratovolcanoVolcanic arc/beltAleutian ArcLast eruptionUnknown

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 ago to about 43,000 years ago.^[1]^[3] The remnant summit crater consists of hydrothermally altered rock. It is the only member of the Katmai volcanic group that is no longer active.^[4]

References

^ ^a ^b "Alagogshak". Alaska Volcano Observatory. U.S. Geological Survey. Retrieved 15 February 2019.
^ PeakVisor, Alagogshak Volcano, Retrieved Jan. 6, 2023.
^ Hildreth, Wes; Fierstein, Judy; Lanphere, Marvin A.; Siems, David F. (1997). "Alagogshak Volcano: A Pleistocene Andesite-Dacite Stratovolcano in Katmai National Park" (PDF). Alaska Volcano Observatory. U.S. Geological Survey. Retrieved 15 February 2019.
^ Fierstein, Judy. "Katmai National Park Volcanoes". National Park Service. Retrieved 15 February 2019.