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 about 25 cubic kilometers (6.0 cu mi). Isotopic analysis indicates that the source of Griggs' magma is distinct from the other Katmai volcanoes.[4]
Mount Griggs
NW view from west rim of Katmai caldera, July 1990
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
January 01, 1970
mount, griggs, formerly, known, knife, peak, volcano, stratovolcano, which, lies, behind, volcanic, defined, other, katmai, group, volcanoes, although, historic, eruptions, have, been, reported, from, vigorously, active, fumaroles, persist, summit, crater, alo. 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 about 25 cubic kilometers 6 0 cu mi Isotopic analysis indicates that the source of Griggs magma is distinct from the other Katmai volcanoes 4 Mount GriggsNW view from west rim of Katmai caldera July 1990Highest pointElevation7 602 ft 2 317 m 1 Prominence7 300 ft 2 200 m ListingNorth America prominent 60thNorth America isolated 91stCoordinates58 21 26 N 155 06 13 W 58 3572 N 155 1037 W 58 3572 155 1037 2 GeographyMount GriggsAlaskaLocationKatmai National Park and Preserve Lake and Peninsula Borough Alaska U S Parent rangeAleutian RangeTopo mapUSGS Mount Katmai B 4GeologyMountain typeStratovolcanoVolcanic arc beltAleutian ArcLast eruption1790 BCE 40 years 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 Map showing volcanoes of Alaska with the mark set at the location of Mount GriggsSee also edit nbsp North America portal nbsp United States portal nbsp Alaska portal nbsp Mountains portal nbsp Volcanoes portal List of mountain peaks of North America List of mountain peaks of the United States List of mountain peaks of Alaska List of Ultras of the United States List of volcanoes in the United StatesReferences edit 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 editMount Griggs at Wikipedia s sister projects nbsp Definitions from Wiktionary nbsp Media from Commons nbsp News from Wikinews nbsp Quotations from Wikiquote nbsp Texts from Wikisource nbsp Textbooks from Wikibooks nbsp 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 Retrieved from https en wikipedia org w index php title Mount Griggs amp oldid 1197987132, wikipedia, wiki, book, books, library,
