• Official Name: Yantarni Volcano
  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 1336m (4383ft)
  • Latitude: 57.0179
  • Longitude: -157.1864
  • Smithsonian VNum: 312100
  • Nearby Towns:
    • Ugashik 35 mi (57 km) NW
    • Pilot Point 40 mi (65 km) NW
    • Port Heiden 55 mi (88 km) SW
    • Kanatak 57 mi (92 km) NE
    • Chignik 68 mi (109 km) SW

    Distance from Anchorage: 388 mi (625 km)


From Wood and Kienle (1990) [1] : "Yantarni volcano is an andesitic stratovolcano comprising ~3.5 cubic km located adjacent to, and within the same arc segment as, Mount Chiginagak. The volcano was not discovered until 1979, owing to its modest summit elevation, remote location, and lack of documented historic activity. Its name is taken from the adjacent bay, named on a Russian chart as "Z. Yantarni" for amber purportedly found there. First mapped at a 1:250,000 scale, the volcano has since been mapped at 1:63,360 and its eruptive history and chemistry determined in greater detail.
"The volcano formed near a high-angle fault at a site of previous Tertiary magmatism. 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. The cone was breached in late Holocene time (between 2,000 and 3,500 yr ago?), forming a debris-avalanche deposit which was possibly accompanied by a directed blast and closely followed by emplacement of a dome and pyroclastic flows. The pyroclastic flows are about 1 cubic km in volume and extend 4 km down-valley.
"Disequilibrium phenocryst assemblages, a lack of correlation between phenocryst assemblages, and whole-rock compositions, eruption of different compositions of magma in close succession, and the small volume of eruptive products suggest Yantarni is an immature volcano lacking a large, shallow magma chamber."

Name Origin

Yantarni Volcano is named after nearby Yantarni Bay and Yantarni Creek. Russian explorers named Yantarni Bay and Yantarni Creek for the abundance of "yantar" or amber, found in the area (U.S. Board of Geographic Names GNIS, accessed February 12, 2009).

References Cited

[1] Volcanoes of North America: United States and Canada, 1990

Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.

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