Moffett Main Ash
Start: 6695 yBP ± 45 Years [1]
Stop: 8310 yBP ± 265 Years [1]
Event Type: Explosive
Description: Waythomas and others (2003) tentatively identify Moffett Volcano as the source of the Main Ash, observed on Adak Island and also called AD-5 by Kiriyanov and Miller (1997).
From Okuno and others (2012): "The Main tephra-fall deposit covers multiple tephra-soil complexes (thickness = 14cm) of multiple, fine, thin tephra and soil (Waythomas and others 2001) and glacial till deposits. The Main tephra-fall deposit is 30cm thick and consists of coarse pumice (maximum pumice size, MP= 1.5cm) and a consolidated ash layer as thick as 5cm in the upper part."
From Waythomas and others (2001): "The most conspicuous tephra deposit on Adak Island, the Main Ash, has long been regarded as the pyroclastic-fall deposit associated with the caldera-forming eruption that destroyed ancestral Mount Kanaton (Coats, 1956; Black, 1980). However, none of the dated tephra deposits on Kanaga Island matches the radiocarbon ages associated with the Main Ash (fig. 13 [in original text])."
From Okuno and others (2012): "The Main tephra-fall deposit covers multiple tephra-soil complexes (thickness = 14cm) of multiple, fine, thin tephra and soil (Waythomas and others 2001) and glacial till deposits. The Main tephra-fall deposit is 30cm thick and consists of coarse pumice (maximum pumice size, MP= 1.5cm) and a consolidated ash layer as thick as 5cm in the upper part."
From Waythomas and others (2001): "The most conspicuous tephra deposit on Adak Island, the Main Ash, has long been regarded as the pyroclastic-fall deposit associated with the caldera-forming eruption that destroyed ancestral Mount Kanaton (Coats, 1956; Black, 1980). However, none of the dated tephra deposits on Kanaga Island matches the radiocarbon ages associated with the Main Ash (fig. 13 [in original text])."
References Cited
[1] Volcanic ashes of Adak Island, Aleutian Islands, Alaska [Vulkanicheskiye peply na o-ve Adak (Aleutskiye o-va, SShA)], 1997
Kiriyanov, V. Y., and Miller, T. P., 1997, Volcanic ashes of Adak Island, Aleutian Islands, Alaska [Vulkanicheskiye peply na o-ve Adak (Aleutskiye o-va, SShA)]: Volcanology and Seismology [Vulkanologiya I Seysmologiya], v. 19, n. 1, p. 52-77.[2] Geology and late Quaternary eruptive history of Kanaga Volcano, a calc-alkaline stratovolcano in the western Aleutian Islands, Alaska, 2003
Waythomas, C. F., Miller, T. P., and Nye, C. J., 2003, Geology and late Quaternary eruptive history of Kanaga Volcano, a calc-alkaline stratovolcano in the western Aleutian Islands, Alaska: in Galloway, J. P., (ed.), Studies by the U.S. Geological Survey in Alaska, 2001, U.S. Geological Survey Professional Paper PP 1678, p. 181-197.
full-text PDF 1.5 MB [3] Holocene Tephra Layers on the Northern Half of Adak Island in the West-Central Aleutian Islands, Alaska, 2012
Okuno, M., Wada, K., Nakamura, T., Gualtieri, L., Sarata, B., West, D., and Torii, M., 2012, Holocene Tephra Layers on the Northern Half of Adak Island in the West-Central Aleutian Islands, Alaska, in West, D., Hatfield, V., Wilmerding, E., Lefevre, C. and Gualtieri, L. (eds.): The People Before: The Geology, Paleoecology and Archaeology of Adak Island, Alaska, Oxford, UK, p. 61-75.Complete Eruption References
Volcanic ashes of Adak Island, Aleutian Islands, Alaska [Vulkanicheskiye peply na o-ve Adak (Aleutskiye o-va, SShA)], 1997
Kiriyanov, V. Y., and Miller, T. P., 1997, Volcanic ashes of Adak Island, Aleutian Islands, Alaska [Vulkanicheskiye peply na o-ve Adak (Aleutskiye o-va, SShA)]: Volcanology and Seismology [Vulkanologiya I Seysmologiya], v. 19, n. 1, p. 52-77.
Geology and late Quaternary eruptive history of Kanaga Volcano, a calc-alkaline stratovolcano in the western Aleutian Islands, Alaska, 2003
Waythomas, C. F., Miller, T. P., and Nye, C. J., 2003, Geology and late Quaternary eruptive history of Kanaga Volcano, a calc-alkaline stratovolcano in the western Aleutian Islands, Alaska: in Galloway, J. P., (ed.), Studies by the U.S. Geological Survey in Alaska, 2001, U.S. Geological Survey Professional Paper PP 1678, p. 181-197.
full-text PDF 1.5 MB 
Holocene Tephra Layers on the Northern Half of Adak Island in the West-Central Aleutian Islands, Alaska, 2012
Okuno, M., Wada, K., Nakamura, T., Gualtieri, L., Sarata, B., West, D., and Torii, M., 2012, Holocene Tephra Layers on the Northern Half of Adak Island in the West-Central Aleutian Islands, Alaska, in West, D., Hatfield, V., Wilmerding, E., Lefevre, C. and Gualtieri, L. (eds.): The People Before: The Geology, Paleoecology and Archaeology of Adak Island, Alaska, Oxford, UK, p. 61-75.
