Mount Griggs Explained

Mount Griggs
Elevation Ft:7602
Elevation Ref:[1]
Prominence Ft:7300
Range:Aleutian Range
Location:Katmai National Park and Preserve, Lake and Peninsula Borough, Alaska, U.S.
Map:USA Alaska
Map Size:250
Label Position:left
Coordinates:58.3572°N -155.1037°W
Coordinates Ref:[2]
Topo:USGS Mount Katmai B-4
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 25km3. 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]

See also

External links

Notes and References

  1. 312190. Griggs. 2020-09-09.
  2. Web site: Griggs. Alaska Volcano Observatory. 2010-03-30.
  3. Web site: Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs - Album. U.S. Geological Survey. 2010-03-30.
  4. Web site: Mount Griggs description and information . Alaska Volcano Observatory . U.S. Geological Survey . 20 February 2019.
  5. 1402983. Mount Griggs. 2010-03-30.