Yantarni Volcano

Last updated
Yantarni Volcano
MountYantarni.jpg
Yantarni Volcano, September 1985
Highest point
Elevation 4,383 ft (1,336 m) [1]
Prominence 2,789 ft (850 m)
Coordinates 57°01′05″N157°11′00″W / 57.01806°N 157.18333°W / 57.01806; -157.18333
Geography
Relief map of USA Alaska.png
Red triangle with thick white border.svg
Yantarni Volcano
Location in Alaska
Location Alaska Peninsula, Alaska, USA
Parent range Aleutian Range
Topo map USGS Ugashik A-4
Geology
Formed by Subduction zone volcanism
Rock age Pleistocene to Holocene
Mountain type Stratovolcano
Volcanic arc Aleutian Arc
Last eruption 800 BCE ± 500 years

Yantarni Volcano is an andesitic stratovolcano in the U.S. state of Alaska. It is on the Alaska Peninsula, in the Aleutian Range, between Mount Aniakchak and Mount Chiginagak volcanoes. [2] The volcano was not discovered until 1979 due to its remote location, lack of documented historic activity, and its rather modest summit elevation. The mountain was named after nearby Yantarni Bay, which in turn was named by Russian explorers after the abundance of amber (янтарь/yantarʹ) in the area. [3]

Contents

Geology

The current cycle of eruptive activity began in middle Pleistocene time with extrusion of andesitic lava flows, perhaps from multiple vents. By the late Pleistocene, central-vent volcanism had initiated construction of a small stratovolcano. [4]

800 BCE ± 500 years eruption

The cone was breached sometime in the late Holocene, between 2 and 3.5 ka, during the only Holocene event. [4] The eruption was similar to that of Mount St. Helens [5] and was followed by the emplacement of 1 cu km of pyroclastic flows related to growth of the summit lava dome. [2] It had a Volcanic Explosivity Index of 5. [6]

Map showing volcanoes of Alaska. The mark is set at the location of Yantarni Volcano. Map of alaska volcanoes yantarni.jpg
Map showing volcanoes of Alaska. The mark is set at the location of Yantarni Volcano.

Notes

  1. ↑ PeakVisor, Yantarni Volcano, Retrieved Jan. 6, 2023.
  2. 1 2 "Yantarni". Global Volcanism Program . Smithsonian Institution.
  3. ↑ "Yantarni - Introduction". Alaska Volcano Observatory . Retrieved 31 October 2010.
  4. 1 2 "Yantarni description and statistics". Alaska Volcano Observatory. Retrieved 2009-06-13.
  5. ↑ Yantarni Volcano - Volcanolive.com
  6. ↑ "Yantarni (Eruptive History)". Global Volcanism Program . Smithsonian Institution. Archived from the original on 2009-04-09. Retrieved 2009-06-13.

Sources


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