Kanaga T1
Start: 9600 yBP [1]
Stop: 9500 yBP [1]
Event Type: Explosive
Description: From Waythomas and others (2001): "Groups of tephra deposits so defined indicate that at least 11 eruptions of Kanaga Volcano have occurred since about 11 ka. Most of these eruptions were probably sub-Plinian to Plinian, producing moderately vesicular dacitic pumice lapilli tephra deposits ranging in thickness from a few centimeters to more than 1 m (table 2 [in original text])."
"Pumice-lapilli fall deposit."
Waythomas and others (2001) correlated their T1 tephra with the basal pink ash on Adak Island, described by Kiriyanov and Miller (1997) (their Ad-6).
From Kiriyanov and Miller (1997): "AD-6 ash is as thin as 0.5-1 cm and consists of pink silt- and clay-size ash. The thickness of the layer and the particle size of the ash are invariable in all the sections examined. The distinctive features of its mineral composition are a considerably high glass content (64%), the significant content of green hornblende (6%), and the presence of brown hornblende (3%) and pyroxenes (1%). The total amount of glass and plagioclase is as large as 80% (Fig. 5 [in original text]). The carbon-14 dating yielded an age of 9500-9600 years (Table 1 [in original text])."
"Pumice-lapilli fall deposit."
Waythomas and others (2001) correlated their T1 tephra with the basal pink ash on Adak Island, described by Kiriyanov and Miller (1997) (their Ad-6).
From Kiriyanov and Miller (1997): "AD-6 ash is as thin as 0.5-1 cm and consists of pink silt- and clay-size ash. The thickness of the layer and the particle size of the ash are invariable in all the sections examined. The distinctive features of its mineral composition are a considerably high glass content (64%), the significant content of green hornblende (6%), and the presence of brown hornblende (3%) and pyroxenes (1%). The total amount of glass and plagioclase is as large as 80% (Fig. 5 [in original text]). The carbon-14 dating yielded an age of 9500-9600 years (Table 1 [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] Preliminary volcano-hazard assessment for Kanaga Volcano, Alaska, 2002
Waythomas, C. F., Miller, T. P., and Nye, C. J., 2002, Preliminary volcano-hazard assessment for Kanaga Volcano, Alaska: U.S. Geological Survey Open-File Report 02-0397, 27 p., 1 sheet.
full-text PDF 38.5 MB
map sheet plate (PDF) 17.5 MB Complete Eruption References
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 
Preliminary volcano-hazard assessment for Kanaga Volcano, Alaska, 2002
Waythomas, C. F., Miller, T. P., and Nye, C. J., 2002, Preliminary volcano-hazard assessment for Kanaga Volcano, Alaska: U.S. Geological Survey Open-File Report 02-0397, 27 p., 1 sheet.
full-text PDF 38.5 MB
map sheet plate (PDF) 17.5 MB 
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.
