Photo of this volcano
  • United States
  • Alaska
  • Stratovolcano
  • 1150 BCE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 52.22°N
  • 175.13°W

  • 273 m
    895 ft

  • 311140
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Koniuji.

The Global Volcanism Program has no Weekly Reports available for Koniuji.

The Global Volcanism Program has no Bulletin Reports available for Koniuji.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1150 BCE ± 1900 years Unknown Confirmed   Ar/Ar
2650 BCE ± 2000 years Unknown Confirmed   Ar/Ar
3850 BCE ± 3100 years Unknown Confirmed   Ar/Ar

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery

A steep, arcuate cliff drops nearly 300 m to the coast on the western side of Koniuji Island. This very small, 1 x 1.5 km wide island, located between Atka Island and Kasatochi volcano, is the emergent top of a mostly submarine volcano. A NE-trending fault cuts the SE side of the island (right). Despite its apparently dissected condition, Holocene lava flows and domes have been dated. Reports of eruptive activity may be erroneous and are considered to refer to eruptions of the relatively undissected Kasatochi volcano to the west.

Photo by E. Bailey, 1982 (U.S. Fish and Wildlife Service).
See title for photo information.

Smithsonian Sample Collections Database

There are no samples for Koniuji in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites