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Kasatochi volcano

Updated: Sep 28, 2022 10:40 GMT -
Stratovolcano 314 m / 1030 ft
Aleutian Islands, USA, 52.17°N / -175.51°W
Current status: normal or dormant (1 out of 5)
Last update: 14 Dec 2021
Satellite image of Kasatochi volcano (c) Google Earth View
Satellite image of Kasatochi volcano (c) Google Earth View

Kasatochi is a remote island forming the peak of a mostly submerged stratovolcano rising to 314 m a.s.l. in the Aleutian island chain. It is one of the volcanoes in the world that formed new islands in historic times.

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Typical eruption style: Explosive
Kasatochi volcano eruptions: 1760 (?), 1827 (?), 1828 (?), 1899 (?), 2008

Latest nearby earthquakes

No recent earthquakes

Background

From Miller and others (1998): "Kasatochi Island, like Gareloi, Bogoslof, and several other volcanoes in the western Aleutian arc, represents the emergent summit of a predominantly submarine volcano. The island consists of a single, undissected cone with a central lake-filled crater about 0.75 km in diameter. A maximum height of 314 m is on the southern crater rim; elevation of the lake is less than about 60 m. Kay (1990) reports a lava dome on the northwest side of the cone at an elevation of ~150 m.
"Coats (1956) referred to Kasatochi as one of a group of little-known volcanoes that appear to be stratovolcanoes composed of basaltic and andesitic flows and pyroclastics. The mean slope of the southern flank (about 18 degrees) is considerably less than the mean slope of the northern flank (about 45 degrees). This asymmetry of form may reflect a predominance of lava flows low on the southern flanks, or, it may be due to a higher rate of erosion by wave action from the north. Bathymetry indicated that Kasatochi is at the northern end of a 15-km-long, 6-km-wide submarine ridge that is normal to the trend of the Andreanof Islands. Water depths along the ridge are less than 90 m; if Kasatochi is constructed entirely on the ridge, the total height of the volcanic pile is only a little more than 400 m."

(from AVO's website, Kasatochi information)

Cited sources:
- Miller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report OF 98-0582, 104 p.
- Coats, R. R., 1956, Reconnaissance geology of some western Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin B 1028-E, p. 83-100, 1 sheet, scale unknown.


See also: Sentinel hub | Landsat 8 | NASA FIRMS
Sun, 14 Sep 2008, 20:28

Kasatochi volcano (Aleutian Islands), activity update: steam and gas plumes

It was reported that during 3-9 September seismic activity from Kasatochi was low. Vigorous steam-and-gas plumes rose above the crater and drifted up to 32 km downwind. On 4 September the Volcano Alert Level was lowered to Advisory and the Aviation Color Code to Yellow. Weak thermal anomalies were detected on 5 and 7 September. ... Read all
Wed, 3 Sep 2008, 06:00

Kasatochi volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 3 September-9 September 2008 (Continuing Activity)

AVO reported that during 3-9 September seismic activity from Kasatochi, detected by stations approximately 40 km W on Great Sitkin island, was low. Vigorous steam-and-gas plumes that rose above the crater and drifted up to 32 km downwind were observed on 3 and 4 September by passing mariners. On 4 September the Volcano Alert Level was lowered to Advisory and the Aviation Color Code to Yellow. ... Read all
Location map showing Kasatochi volcano. Image source: Snedigar, Seth, courtesy of the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys
Location map showing Kasatochi volcano. Image source: Snedigar, Seth, courtesy of the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys
map showing location of Mount Okmok. Image source: Cameron, Cheryl, courtesy of the Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys
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