Available Weekly Reports
FAQ
| Kanaga |
Google Earth Placemark
- United States
- Aleutian Islands
- Stratovolcano
- 1995
- Country
- Subregion Name
- Volcano Type
- Last Known Eruption
- 1307 m
4287 ft - 51.923°
- -177.168°
- Elevation
- Latitude
- Longitude
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.
Sources:
Alaska Volcano Observatory (AVO)
2012: February |
29 February 2012
Back to TopAVO 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.
Sources: Alaska Volcano Observatory (AVO)
22 February 2012
Back to TopAVO 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.
Sources: Alaska Volcano Observatory (AVO)
15 February 2012
Back to TopAVO 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.
Sources: 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 |
|---|---|---|---|---|---|
| [ 1996 Jun 11 ] | [ Unknown ] | Uncertain | 1 | ||
| 1995 Jun 19 (?) | 1995 Jun 23 (?) | Confirmed | 2 | Historical | |
| 1994 Jan 5 ± 4 days | 1994 Nov 26 ± 4 days | Confirmed | 2 | Historical | |
| 1942 | Unknown | Confirmed | 1 | Historical | |
| [ |
[ |
Discredited | |||
| 1906 May | Unknown | Confirmed | Historical | Summit, upper SW flank | |
| 1904 | Unknown | Confirmed | 0 | Historical | Upper south flank ? |
| [ 1829 ] | [ Unknown ] | Uncertain | |||
| [ 1827 ] | [ Unknown ] | Uncertain | |||
| [ |
[ |
Discredited | |||
| 1783 (?) | 1787 (?) | Confirmed | Historical | ||
| [ |
[ |
Discredited | |||
| [ 1763 ] | [ Unknown ] | Uncertain | |||
| 1400 ± 50 years | Unknown | Confirmed | Radiocarbon (corrected) | T11 tephra | |
| 1150 ± 100 years | Unknown | Confirmed | Radiocarbon (corrected) | T10 tephra | |
| 850 ± 200 years | Unknown | Confirmed | Radiocarbon (corrected) | T9 tephra | |
| 200 ± 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 |
Symmetrical Kanaga stratovolcano is situated within the Kanaton caldera at the northern tip of Kanaga Island. The rim of Kanaton caldera 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.
