Alagogshak
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. [1][2] The remnant summit crater consists of hydrothermally altered rock. It is the only member of the Katmai volcanic group that is no longer active.[3]
Map showing volcanoes of Alaska Peninsula.
| Alagogshak | |
|---|---|
 Alagogshak summit in 1997 | |
| Highest point | |
| Elevation | 5,495 ft (1,675 m) [1] |
| Coordinates | 58°09′26″N 155°23′54″W |
| Geography | |
| Location | Katmai National Park and Preserve, Alaska, U.S. |
| Parent range | Aleutian Range |
| Topo map | USGS Adak C-2 |
| Geology | |
| Mountain type | Stratovolcano |
| Volcanic arc/belt | Aleutian Arc |
References
- "Alagogshak". Alaska Volcano Observatory. U.S. Geological Survey. Retrieved 15 February 2019.
- 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.
External links
- Alagogshak at the Alaska Volcano Observtory
- Alagogshak Volcano: A Pleistocene Andesite-Dacite Stratovolcano in Katmai National Park
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