Kanaga volcano

stratovolcano 1307 m / 4,288 ft
Andreanof Islands, Aleutian Islands, Alaska , 51.92°N / -177.17°W
Current status: normal or dormant (1 out of 5)
Last update: 11 Sep 2012 (Alert lowered to normal)
Kanaga Volcano Viewed from the west with Mt Moffet, Adak and Great Sitkin in the background (image taken May 8, 2010 by Cyrus Read, AVO/USGS)
Kanaga Volcano Viewed from the west with Mt Moffet, Adak and Great Sitkin in the background (image taken May 8, 2010 by Cyrus Read, AVO/USGS)

Kanaga volcano is an active symmetrical stratovolcano rising 1300 m on the northern part of Kanaga Island in the western Aleutians, Alaska. It is one of the most southerly volcanoes of the central Aleutian chain.
The volcano has a small 200 m wide and 60 m deep circular summit crater with fumaroles inside the crater and around its rims. Historical eruptions have been recorded since 1763, but not in much detail due to the remoteness of the volcano. A new eruption might have started on 18 February 2012.

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Typical eruption style: explosive
Kanaga volcano eruptions: 2012 (?), 1993-95, 1942, 1933, 1906, 1904, 1829 (?), 1791 (?), 1790 (?), 1783-87 (?), 1768, 1763

TimeMag. / DepthDistance/Location
Friday, October 8, 2021 16:13 GMT (1 earthquake)
Oct 8, 2021 7:13 am (GMT -9) (Oct 8, 2021 16:13 GMT)
2.0

5 km
42 km (26 mi)
39 Km SSW of Adak, Alaska
Wednesday, October 6, 2021 23:05 GMT (2 earthquakes)
Oct 6, 2021 2:05 pm (GMT -9) (Oct 6, 2021 23:05 GMT)
0.3

4.5 km
9.1 km (5.7 mi)
30 Km WNW of Adak, Alaska
Oct 6, 2021 2:02 pm (GMT -9) (Oct 6, 2021 23:02 GMT)
0.6

3.3 km
9.5 km (5.9 mi)
30 Km WNW of Adak, Alaska

Background

Symmetrical Kanaga stratovolcano is situated within the Kanaton caldera at the northern tip of Kanaga Island. It is composed of interbedded basaltic and andesitic lava flows, scoria layers, and pyroclastic rocks.
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.
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.
(Smithsonian / GVP volcano information)

1994-95 eruption
Prior to 2012, the last eruption of Kanaga was in 1994-1995 when observed eruptive plumes were relatively dilute, rising to altitudes of less than 3 km (9,840 ft) and dropping ash onto the flanks of the volcano. Larger ash emissions reaching up to 7.5 km occurred on 21 February 1995. ...more

1906 eruption
Kanaga was seen in eruption 1906 a hunter reported. The eruption was accompanied by earthquakes and lava flows were reported on the east and west side of the steep volcano's cone.

1904 eruption
Not much is known about the eruption of Kanaga volcano in 1904. Historic documents suggest a lava flow on the upper southern flank.

See also: Sentinel hub | Landsat 8
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