Kanaga

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 51.923°N
  • 177.168°W

  • 1307 m
    4287 ft

  • 311110
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

29 February-6 March 2012

AVO reported that the level of unrest at Kanaga declined to background levels. On 2 March the Volcano Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.

Source: US Geological Survey Alaska Volcano Observatory (AVO)



 Available Weekly Reports


2012: February


29 February-6 March 2012

AVO reported that the level of unrest at Kanaga declined to background levels. On 2 March the Volcano Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


22 February-28 February 2012

AVO reported that no unusual activity was detected in seismic data or in partly-cloudy satellite images of Kanaga during 22-24 and 26-28 February. Low-level volcanic tremor was detected on 25 February. The Volcano Alert Level remained at Advisory and the Aviation Color Code remained at Yellow.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


15 February-21 February 2012

AVO reported possible explosive activity at Kanaga on 18 February. Volcanic tremor detected during 0623-0627 was followed by about an hour of numerous small seismic events. Satellite images showed a detached ash plume, 8 km in length, which drifted 39 km NE. AVO raised the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory on 18 February. Elevated seismic activity continued on 19 February, and photographs taken by a local observer showed a small steam plume. Clouds prevented views of the volcano during 19-21 February.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2012 Feb 18 2012 Feb 18 Confirmed 2 Historical Observations
[ 1996 Jun 11 ] [ Unknown ] Uncertain 1  
1995 Jun 19 (?) 1995 Jun 23 (?) Confirmed 2 Historical Observations
1994 Jan 5 ± 4 days 1994 Nov 26 ± 4 days Confirmed 2 Historical Observations
1942 Unknown Confirmed 1 Historical Observations
[ 1933 ] [ Unknown ] Discredited    
1906 May Unknown Confirmed   Historical Observations Summit, upper SW flank
1904 Unknown Confirmed 0 Historical Observations Upper south flank ?
[ 1829 ] [ Unknown ] Uncertain    
[ 1827 ] [ Unknown ] Uncertain    
[ 1790 ] [ 1791 ] Discredited    
1783 (?) 1787 (?) Confirmed   Historical Observations
[ 1768 ] [ Unknown ] Discredited    
[ 1763 ] [ Unknown ] Uncertain    
1400 ± 50 years Unknown Confirmed   Radiocarbon (corrected) T11 tephra
1150 ± 100 years Unknown Confirmed   Radiocarbon (corrected) T10 tephra
0850 ± 200 years Unknown Confirmed   Radiocarbon (corrected) T9 tephra
0200 ± 150 years Unknown Confirmed   Radiocarbon (corrected) T8 tephra
1550 BCE ± 100 years Unknown Confirmed   Radiocarbon (corrected) T7 tephra
1900 BCE ± 300 years Unknown Confirmed   Radiocarbon (corrected) T6 tephra
2150 BCE ± 200 years Unknown Confirmed   Radiocarbon (corrected) T5 tephra
2300 BCE ± 150 years Unknown Confirmed   Radiocarbon (corrected) T4 tephra
4700 BCE ± 150 years Unknown Confirmed   Radiocarbon (corrected) T3 tephra
7300 BCE ± 500 years Unknown Confirmed   Radiocarbon (corrected) T2 tephra

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. 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. Additional discussion of data sources can be found under Volcano Data Criteria.

Coats R R, 1950. Volcanic activity in the Aleutian Arc. U S Geol Surv Bull, 974-B: 35-47.

Coats R R, 1956b. Geology of northern Kanaga Island, Alaska. U S Geol Surv Bull, 1028-D: 69-81.

Coombs M L, White S M, Scholl D W, 2007b. Massive edifice failure at Aleutian arc volcanoes. Earth Planet Sci Lett, 256: 403-418.

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..

Miller T P, McGimsey R G, Richter D H, Riehle J R, Nye C J, Yount M E, Dumoulin J A, 1998. Catalogue of the historically active volcanoes of Alaska. U S Geol Surv Open-File Rpt, 98-582: 1-104.

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.

Myers J D, 1994. The Geology, Geochemistry and Petrology of the recent Magmatic Phase of the Central and Western Aleutian Arc. Unpublished manuscript, unpaginated.

Newhall C G, Dzurisin D, 1988. Historical unrest at large calderas of the world. U S Geol Surv Bull, 1855: 1108 p, 2 vol.

Romick J D, Kay S M, Kay R W, 1992. The influence of amphibole fractionation on the evolution of calc-alkaline andesite and dacite tephra from the central Aleutians, Alaska. Contr Mineral Petr 112: 101-118.

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.

Waythomas C F, Miller T P, Nye C J, 2003. Geology and late Quaternary eruptive history of Kanaga volcano, a calc-alkaline stratovolcano in the western Aleutian Islands, Alaska. Studies by the U.S. Geological Survey in Alaska, 2001 U S Geol Surv Profl Pap, 1678: 181-197.

Symmetrical Kanaga stratovolcano is situated within the Kanaton caldera at the northern tip of Kanaga Island. The caldera rim forms a 760-m-high arcuate ridge south and east of Kanaga; a lake occupies part of the SE caldera floor. The volume of subaerial dacitic tuff is smaller than would typically be associated with caldera collapse, and deposits of a massive submarine debris avalanche associated with edifice collapse extend nearly 30 km to the NNW. Several fresh lava flows from historical or late prehistorical time descend the flanks of Kanaga, in some cases to the sea. Historical eruptions, most of which are poorly documented, have been recorded since 1763. Kanaga is also noted petrologically for ultramafic inclusions within an outcrop of alkaline basalt SW of the volcano. Fumarolic activity occurs in a circular, 200-m-wide, 60-m-deep summit crater and produces vapor plumes sometimes seen on clear days from Adak, 50 km to the east.