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The very small, 1 x 1.5 km wide Koniuji Island, located between Atka and Kasatochi volcanoes, is the emergent top of a mostly submarine volcano. The summit of the mostly submerged volcano reaches only 273 m above sea level. The volcano, which lies about 20 km north of the western side of Atka Island, is deeply dissected, with a steep, arcuate cliff on the west. New argon-argon dating indicates that the island emerged above sea level aout 15,000 years ago, and that several lava flows and domes were erupted during the Holocene. The summit lava dome is younger than about 3000 years. Reports of historical eruptive activity may be erroneous and are considered to refer to eruptions of the relatively undissected Kasatochi volcano to the west.
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.
|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).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
Coats R R, 1950. Volcanic activity in the Aleutian Arc. U S Geol Surv Bull, 974-B: 35-47.
Henning R A, Rosenthal C H, Olds B, Reading E (eds), 1976. Alaska's volcanoes, northern link in the ring of fire. Alaska Geog, 4: 1-88.
IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..
Jicha B R, 2009. Holocene volcanic activity at Koniuji Island, Aleutians. J Volc Geotherm Res, 185: 214-222.
Motyka R J, Liss S A, Nye C J, Moorman M A, 1993. Geothermal resources of the Aleutian arc. Alaska Div Geol Geophys Surv, Prof Rpt, no 114, 17 p and 4 map sheets.
Smith R L, Shaw H R, Luedke R G, Russell S L, 1978. Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States. U S Geol Surv Open-File Rpt, 78-925: 1-25.
Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.