Alaska Volcano Observatory | Kasatochi

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Kasatochi
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Kasatochi
Description
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Official Name:
Kasatochi Island
Seismically Monitored:
No
Color Code:
UNASSIGNED
Alert Level:
UNASSIGNED
Elevation:
314m (1030ft)
Latitude:
52.1693
Longitude:
-175.5113
Smithsonian VNum:
311130
Nearby Towns:
Adak 52 mi (83 km)
SW
Atka 56 mi (89 km)
NE
Nikolski 284 mi (457 km)
NE
Saint George 389 mi (626 km)
NE
Unalaska 391 mi (629 km)
NE
Distance from Anchorage: 1144 mi (1841 km)
Description
From Miller and others (1998)
[1]
: "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)
[2]
reports a lava dome on the northwest side of the cone at an elevation of ~150 m.
"Coats (1956)
[3]
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."
Name Origin
"Kasatochi Island" is a Russian name published as "Kosatochyey" by Lieutenant Sarichev (1802), shown as "L'ile Kassatotchy" by Lutke (1836), and as "O[strov] Kasatochiy" on the Russian Hydrographic Department Chart 1400 (1848) (Orth, 1971). Bergsland (1959) records the Unangam Tunuu place name of Kasatochi as "qana-tanar," meaning "which island," as in "which island is it that is emerging out there."
References Cited
[1]
Catalog of the historically active volcanoes of Alaska
, 1998
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 98-0582, 104 p.
title page PDF
52
intro and TOC PDF
268 KB
eastern part - Wrangell to Ukinrek Maars PDF
972 KB
central part - Chiginagak to Cleveland PDF
2,463 KB
western part - Carlisle to Kiska PDF
956 KB
references PDF
43 KB
[2]
Volcanoes of North America: United States and Canada
, 1990
Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.
[3]
Reconnaissance geology of some western Aleutian Islands, Alaska
, 1956
Coats, R. R., 1956, Reconnaissance geology of some western Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-E, p. 83-100, 1 sheet, scale unknown.
full-text PDF
4.4 MB
plate 17 PDF
1.6 MB
Current Activity
No new updates for Kasatochi volcano since October 31, 2008, 1:42 pm.
Recent Updates
No new activity observed. Aviation Color Code and Volcano Alert Level reduced.
Oct 31st, 2008 01:42:09 PM
Alert level decrease to Unassigned/Unassigned. No new activity observed.
Oct 30th, 2008 04:41:08 PM
No new activity observed.
Oct 30th, 2008 11:04:09 AM
No new activity observed.
Oct 29th, 2008 12:46:56 PM
No new activity observed.
Oct 28th, 2008 12:33:45 PM
Color Code Timeline
An explanation of color codes and alert levels can be found
here
.
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Ash Forecasting
Mathematical models developed by the USGS forecast various aspects of how a volcanic ash plume will interact with wind—where, how high, and how fast ash particles will be transported in the atmosphere, as well as where ash will fall out and accumulate on the ground. AVO runs these models when a volcano is restless by assuming a reasonable hypothetical eruption, to provide a pre-eruptive forecast of areas likely to be affected. During an ongoing eruption, AVO will update the forecast with actual observations (eruption start time and duration, plume height) as they become available.
View the current airborne ash cloud models for Kasatochi
Ashfall thickness forecast
The Ash3d model was developed by the USGS to forecast how a volcanic ash plume will interact with wind and where ash will fall out and accumulate on the ground. AVO runs these models twice daily when a volcano is restless by assuming a reasonable
hypothetical
eruption altitude and duration. The map shows the model results of ashfall thickness for areas that are likely to be affected, if one were to occur. During an ongoing eruption, AVO will update the forecast with actual observations (eruption start time and duration, plume height) as they become available, and these plots will be automatically updated. The
National Weather Service
Anchorage Forecast Office will issue the official ashfall warning product and post them at
weather.gov/afc
THESE PRODUCTS MAY NOT BE CURRENT.
During an actual eruption, see National Weather Service forecasts of ashfall:
https://weather.gov/afc
.
Ashfall Forecast
Click on the X on the graphic (upper right) to expand the map to show the map legend.
Ashfall Start Time
This map shows the modeled estimate of the time it would take for ashfall to begin following an eruption. It corresponds to the ashfall thickness forecast map shown above. This map uses the start time of either the twice-daily hypothetical model runs (time shown in the legend) or the actual eruption start time (if one were to occur). In the case of an actual eruption, the National Weather Service Anchorage Forecast Office will issue the official ashfall warning product that includes the ashfall start time and post them at
weather.gov/afc
THESE PRODUCTS MAY NOT BE CURRENT.
During an actual eruption, see National Weather Service forecasts of ashfall:
https://weather.gov/afc
.
Ashfall Start Times Forecast
Click on the X on the graphic (upper right) to expand the map to show the map legend.
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