Redoubt
Facts
- Official Name: Redoubt Volcano
- Seismically Monitored: Yes
- Color Code: GREEN
- Alert Level: NORMAL
- Elevation: 3108m (10196ft)
- Latitude: 60.4852
- Longitude: -152.7438
- Smithsonian VNum: 313030
- Pronunciation:
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Nearby Towns:
- Ninilchik 47 mi (76 km) SE
- Salamatof 48 mi (78 km) NE
- Clam Gulch 49 mi (79 km) SE
- Nikiski 50 mi (81 km) NE
- Cohoe 50 mi (80 km) SE
Distance from Anchorage: 108 mi (174 km)
Description
From Miller and others (1998) [1] : "Redoubt Volcano is a steep-sided cone about 10 km in diameter at its base and with a volume of 30-35 cubic kilometers. The volcano is composed of intercalated pyroclastic deposits and lava flows and rests on Mesozoic granitic rocks of the Alaska-Aleutian Range batholith [2] [3] . It has been moderately dissected by the action of numerous alpine glaciers. A 1.8-km-wide, ice-filled summit crater is breached on the north side by a northward-flowing glacier, informally known as the Drift Glacier, which spreads into a piedmont lobe in the upper Drift River Valley. The most recently active vent is located on the north side of the crater at the head of the Drift glacier. Holocene lahar deposits in the Crescent River and Drift River valleys extend downstream as far as Cook Inlet."Name Origin
"Redoubt Volcano" is a translation of the Russian name "Sopka Redutskaya (Tebenkov, 1852). According to Constantin Grewingk (1850), the Native name "Ujakushatsch" also means "fortified place" but it is difficult to determine if one name is derived from the other (Orth, 1971).
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.
intro and TOC PDF 268 KB
references PDF 43 KB [2] Redoubt volcano, southern Alaska: a hazard assessment based on eruptive activity through 1968, 1993
Till, A. B., Yount, M. E., and Riehle, J. R., 1993, Redoubt volcano, southern Alaska: a hazard assessment based on eruptive activity through 1968: U.S. Geological Survey Bulletin 1996, 19 p., 1 sheet, scale 1:125,000.
full-text PDF 1.4 MB
plate 1 PDF 27 MB [3] The geologic history of Redoubt Volcano, Alaska, 1994
Till, A. B., Yount, M. E., and Bevier, M. L., 1994, The geologic history of Redoubt Volcano, Alaska: in Miller, T. P. and Chouet, B. A., (eds.), The 1989-1990 eruptions of Redoubt Volcano, Alaska, Journal of Volcanology and Geothermal Research, v. 62, n. 1, p. 11-30.Current Activity
Recent Updates
Webcams
![Redoubt [Cook Inlet, 40 ft]](https://www.avo.alaska.edu/ashcam-api/images/redoubt-2/2025/90/redoubt-2-20250401T012100Z.jpg)
Webicorder
Color Code Timeline
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Before an eruption
Ashfall & Preparedness Information
- Ashfall impacts & preparedness (US Geological Survey)
- Volcanic health hazards & impacts (International Volcanic Health Hazards Network)
- Ash Alert! Pamphlet (AK Division of Homeland Security & Emergency Management)
- Volcanic Ashfall (AK Department of Environmental Conservation, Division of Air Quality)
During and After an Eruption
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 Redoubt
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
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.