Yantarni Volcano

Remote andesitic stratovolcano in the U.S. state of Alaska

Yantarni Volcano

Location in Alaska

LocationAlaska Peninsula, Alaska, USAParent rangeAleutian RangeTopo mapUSGS Ugashik A-4GeologyAge of rockPleistocene to HoloceneMountain typeStratovolcanoVolcanic arc/beltAleutian ArcLast eruption800 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 yantar in the area.^[3]

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]

Notes

^ PeakVisor, Yantarni Volcano, Retrieved Jan. 6, 2023.
^ ^a ^b "Yantarni". Global Volcanism Program. Smithsonian Institution.
^ "Yantarni - Introduction". Alaska Volcano Observatory. Retrieved 31 October 2010.
^ ^a ^b "Yantarni description and statistics". Alaska Volcano Observatory. Retrieved 2009-06-13.
^ Yantarni Volcano - Volcanolive.com
^ "Yantarni (Eruptive History)". Global Volcanism Program. Smithsonian Institution. Retrieved 2009-06-13.