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Amukta

Photo of this volcano
  • United States
  • Alaska
  • Stratovolcano
  • 1997 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 52.5°N
  • 171.252°W

  • 1066 m
    3497 ft

  • 311190
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: September 1997 (BGVN 22:09) Citation IconCite this Report

Ash puff on 2 March rises to just above the summit

On 2 March a pilot reported a small eruption at Amukta volcano in the central Aleutian Islands. Ash barely clearing the top of the volcano was reported.

Information Contacts: Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA (URL: http://www.avo.alaska.edu/), b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA.

The Global Volcanism Program has no Weekly Reports available for Amukta.

Bulletin Reports - Index

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

08/1987 (SEAN 12:08) Possible source of 10.6-km cloud

09/1996 (BGVN 21:09) Small ash plumes observed in mid-September

09/1997 (BGVN 22:09) Ash puff on 2 March rises to just above the summit




Information is preliminary and subject to change. All times are local (unless otherwise noted)


August 1987 (SEAN 12:08) Citation IconCite this Report

Possible source of 10.6-km cloud

At about 1000 on 28 August pilots Charles Kozler, Wayne Russell, and George Wooliver (Reeve Aleutian Airways) reported an eruption plume reaching 10.5 km altitude in the vicinity of Amukta, drifting WNW. The FAA issued a NOTAM warning pilots to stay 25 miles [40 km] from Amukta Island. Heavy weather clouds covered Amukta Island so its activity could not be directly observed. Mt. Cleveland, 100 km ENE, was apparently active that same morning and winds were blowing in the direction of Amukta (see Mt. Cleveland 12:08). The origin of the large cloud remains both uncertain and controversial at the time of this report.

On 4 September Wooliver observed a small dark ash plume rising at least 300 m above the summit of Amukta then drifting as much as 1 km NW. Only the NW flank was visible because of cloud cover. His observations were made from 9,750 m altitude from nearly 120 km N. Wooliver has flown in the Aleutian Islands since the 1950's and is experienced at observing eruptions.

Amukta's last known eruptive activity was on 12 July 1984 (BVE, no. 24). Harold Wilson (Peninsula Airways) notes that normal activity . . . is continuous minor steam emission from several small vents just inside the summit crater rim.

Information Contacts: T. Miller, USGS Anchorage; J. Reeder, ADGGS.


September 1996 (BGVN 21:09) Citation IconCite this Report

Small ash plumes observed in mid-September

On 18 September AVO received a pilot report of a small ash plume above Amukta. An Alaska Airlines pilot noted black and gray ash clouds rising ~300 m above the summit crater during overflights on 17 and 18 September. The ash plumes extended ~16 km S over the Pacific Ocean before dissipating. No plume was visible on satellite imagery.

Information Contacts: Alaska Volcano Observatory (AVO); NOAA/NESDIS Satellite Analysis Branch, Room 401, 5200 Auth Road, Camp Springs, MD 20746, USA.


September 1997 (BGVN 22:09) Citation IconCite this Report

Ash puff on 2 March rises to just above the summit

On 2 March a pilot reported a small eruption at Amukta volcano in the central Aleutian Islands. Ash barely clearing the top of the volcano was reported.

Information Contacts: Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA (URL: http://www.avo.alaska.edu/), b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

There is data available for 8 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1997 Mar 3 Unknown Confirmed 1 Historical Observations
1996 Sep 17 1996 Sep 18 Confirmed 1 Historical Observations
1987 Sep 4 (?) Unknown Confirmed 1 Historical Observations
1963 Feb 13 Unknown Confirmed 3 Historical Observations
1878 Unknown Confirmed   Historical Observations
[ 1876 ] [ Unknown ] Uncertain    
1786 Jun 1791 Confirmed 3 Historical Observations
[ 1770 ] [ Unknown ] Uncertain    
Deformation History

There is data available for 2 deformation periods. Expand each entry for additional details.


Deformation during 1993 - 2009 [Subsidence; Observed by InSAR]

Start Date: 1993 Stop Date: 2009 Direction: Subsidence Method: InSAR
Magnitude: Unknown Spatial Extent: Unknown Latitude: Unknown Longitude: Unknown

Remarks: Subsidence on the SE flank of the volcano due to contraction of magma or depressurization of the hydrothermal system.

Figure (see Caption)

a Average deformation image of Amukta Island produced by stacking interferograms from track 430 (also shown in Fig. 6.62a). b Best-fit source model of the upper southeast flank deformation field shown in (a) using a Mogi source located 1 km beneath the surface at the white dot. A full cycle of colors (i.e., one interferometric fringe) in (a) and (b) represents 10 mm/ year of surface displacement along the LOS. c High-resolution airborne SAR image of Amukta acquired by UAVSAR (illumination from the north). Areas of subsidence on the lower western flank and upper southeastern flank that are identified in Figs. 6.61 and 6.62 are outlined by solid and dashed lines, respectively

From: Lu and Dzurisin 2014.


Reference List: Lu and Dzurisin 2014.

Full References:

Lubis, A. M., 2014. Uplift of Kelud Volcano Prior to the November 2007 Eruption as Observed by L-Band Insar. Journal of Engineering and Technological Sciences, 46(3), 245-257.

Deformation during 1993 - 2009 [Subsidence; Observed by InSAR]

Start Date: 1993 Stop Date: 2009 Direction: Subsidence Method: InSAR
Magnitude: Unknown Spatial Extent: Unknown Latitude: Unknown Longitude: Unknown

Remarks: Subisdence on SW flank of volcano due to contraction of the 1963 lava flow.

Figure (see Caption)

a Average deformation image of Amukta Island produced by stacking interferograms from track 430 (also shown in Fig. 6.62a). b Best-fit source model of the upper southeast flank deformation field shown in (a) using a Mogi source located 1 km beneath the surface at the white dot. A full cycle of colors (i.e., one interferometric fringe) in (a) and (b) represents 10 mm/ year of surface displacement along the LOS. c High-resolution airborne SAR image of Amukta acquired by UAVSAR (illumination from the north). Areas of subsidence on the lower western flank and upper southeastern flank that are identified in Figs. 6.61 and 6.62 are outlined by solid and dashed lines, respectively

From: Lu and Dzurisin 2014.


Reference List: Lu and Dzurisin 2014.

Full References:

Lubis, A. M., 2014. Uplift of Kelud Volcano Prior to the November 2007 Eruption as Observed by L-Band Insar. Journal of Engineering and Technological Sciences, 46(3), 245-257.

Emission History

There is no Emissions History data available for Amukta.

Photo Gallery

Symmetrical snow-capped Amukta stratovolcano in the central Aleutian Islands is located at the northern side of an arcuate caldera-like feature along the coast of the 8-km-wide island of the same name. The 1066-m-high stratovolcano overlies a broad shield volcano and is topped by a 400-m-wide crater. Amukta has had several eruptions since the late 18th century from both summit and flank vents.

Photo by U.S. Fish and Wildlife Service, 1972 (courtesy of Alaska Volcano Observatory).
See title for photo information.
The ruggedly dissected eastern side of the Chagulak volcano rises to 1142 m above a sea of clouds. Chagulak is the summit of a small, unstudied stratovolcano NE of Amukta, the flat-topped volcano in the left distance. The two volcanoes coalesce at depth although they are separated by 7 km of ocean. No historical eruptions have been recorded from Chagulak volcano, and its age is not precisely known.

Photo by Fred Deines, 1992 (U.S. Fish and Wildlife Service).
See title for photo information.
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.


Title: Samalga Island
Publisher: US Department of Commerce, NOAA National Ocean Service
Country: United States
Year: 1987
Map Type: Bathymetric
Scale: 1:250,000
Map of Samalga Island

Title: Dutch Harbor
Publisher: US Department of Commerce, NOAA National Ocean Service
Country: United States
Year: 1987
Series: Section Aero Chart
Map Type: Navigation
Scale: 1:500,000
Map of Dutch Harbor

Title: United States
Publisher: DMA Aerospace Center
Country: United States
Year: 1987
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of United States

Title: Saint George Basin Regional Map
Publisher: USDI Minerals Management Service
Country: United States
Year: 1984
Series: OCSRM maps
Map Type: Bathymetric
Scale: 1:1,000,000
Map of Saint George Basin Regional Map

Title: Magnetic Map of N Pacific Ocean
Publisher: US Department of Commerce, NOAA National Ocean Service
Country: United States
Year: 1973
Series: Seamap
Map Type: Geophysical (Magnetic)
Scale: 1:1,000,000
Map of Magnetic Map of N Pacific Ocean

Title: Gravity Map of N Pacific Ocean
Publisher: US Department of Commerce, NOAA National Ocean Service
Country: United States
Year: 1973
Series: Seamap
Map Type: Geophysical (Gravity)
Scale: 1:1,000,000
Map of Gravity Map of N Pacific Ocean

Title: Amukta
Publisher: US Geological Survey
Country: United States
Year: 1951
Series: AK Recon Topo 250
Map Type: Topographic
Scale: 1:250,000
Map of Amukta
Smithsonian Sample Collections Database

There are no samples for Amukta in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites