| Mount Griggs | |
|---|---|
 NW view from west rim of Katmai caldera, July 1990 | |
| Highest point | |
| Elevation | 7,602 ft (2,317 m)[1] |
| Prominence | 7,300 ft (2,200 m) |
| Listing | |
| Coordinates | 58°21′26″N 155°06′13″W / 58.3572°N 155.1037°W[2] |
| Geography | |
  Mount Griggs Alaska | |
| Location | Katmai National Park and Preserve, Lake and Peninsula Borough, Alaska, U.S. |
| Parent range | Aleutian Range |
| Topo map | USGS Mount Katmai B-4 |
| Geology | |
| Mountain type | Stratovolcano |
| Volcanic arc/belt | Aleutian Arc |
| Last eruption | 1790 BCE ± 40 years |
Mount Griggs, formerly known as Knife Peak Volcano, is a stratovolcano, which lies 10 km behind the volcanic arc defined by other Katmai group volcanoes. Although no historic eruptions have been reported from Mount Griggs, vigorously active fumaroles persist in a summit crater and along the upper southwest flank. The fumaroles on the southwest flank are the hottest, and some of the flank fumaroles can roar so loudly that they can be heard from the valley floor.[1] The slopes of Mount Griggs are heavily mantled by fallout from the 1912 eruption of Novarupta volcano.[3] The summit consists of three concentric craters, the lowest and largest of which contains a recent summit cone topped by two craters. The volume of the volcanic edifice is estimated at 25 cubic kilometers (6.0 cu mi). Isotopic analysis indicates that the source of Griggs' magma is distinct from the other Katmai volcanoes.[4]
The mountain was named for Dr. Robert Fiske Griggs (1881–1962), botanist, whose explorations of the area, after the eruption of Mount Katmai in 1912, led to the creation of Katmai National Monument by President Woodrow Wilson in 1918.[5]
YouTube Encyclopedic
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Fumaroles on Mount Griggs
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Exploring a Bear Den
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Alaska Valley of 10000 Smokes 2015
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Erupting sulphur encrusted fumarole of volcano in Hokkaido Japan.
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Yellowstone National Park geysers, vents, fumaroles, and springs.
Transcription
See also
- List of mountain peaks of North America
- List of Ultras of the United States
- List of volcanoes in the United States
References
- ^ a b "Griggs". Global Volcanism Program. Smithsonian Institution. Retrieved 2020-09-09.
- ^ "Griggs". Alaska Volcano Observatory. Retrieved 2010-03-30.
- ^ "Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs - Album". U.S. Geological Survey. Retrieved 2010-03-30.
- ^ "Mount Griggs description and information". Alaska Volcano Observatory. U.S. Geological Survey. Retrieved 20 February 2019.
- ^ "Mount Griggs". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2010-03-30.
External links
Definitions from Wiktionary
Media from Commons
News from Wikinews
Quotations from Wikiquote
Texts from Wikisource
Textbooks from Wikibooks
Resources from Wikiversity
- Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs
- Mount Griggs at the Alaska Volcano Observatory
- Mount Griggs at the Smithsonian Global Volcanism Project
| Authority control databases: Geographic |
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This page was last edited on 23 May 2024, at 15:51