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Yunaska

Photo of this volcano
  • Country
  • Volcanic Region
  • Landform | Volc Type
  • Last Known Eruption
  • 52.6394°N
  • 170.6317°W

  • 550 m
    1,804 ft

  • 311210
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports available for Yunaska.

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

The Global Volcanism Program has no Bulletin Reports available for Yunaska.

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 3 confirmed Holocene eruptive periods.

1937 Nov 3 - 1937 Nov 4 Confirmed Eruption VEI: 3

Episode 1 | Eruption
1937 Nov 3 - 1937 Nov 4 Evidence from Observations: Reported
 Coats (1950) reported a major explosive eruption on 3-4 November 1937. Hantke (1939a) noted press reports of a devastating eruption with ashfall and a lava flow. A violent eruption with "flames" originating near the center of the island was reported by a passing ship (Miller et al., 1998).

List of 4 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Lava flow Uncertain
   - - - -    - - - - Flames
1937 Nov 3    - - - - VEI (Explosivity Index)

[ 1929 ] Uncertain Eruption

Episode 1 | Uncertain
1929 - Unknown Evidence from Unknown
 "Smoke" was reported in 1929 (Powers, 1958).

List of 1 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Volcanic "smoke"

[ 1873 ] Uncertain Eruption

Episode 1 | Uncertain
1873 - Unknown Evidence from Unknown
 Decker (1971) lists an eruption in 1873, apparently originating from Becker's (1898) report that Yunaska steamed in 1873.

List of 1 Events for Episode 1

Start Date End Date Event Type Event Remarks
1873    - - - - VEI (Explosivity Index)

1830 Confirmed Eruption VEI: 2

Episode 1 | Eruption
1830 - Unknown Evidence from Observations: Reported
 Minor ash emission took place in 1830 (Coats, 1950).

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion weak or small
   - - - -    - - - - Ash weak or small
1830    - - - - VEI (Explosivity Index)

1824 Confirmed Eruption VEI: 3

Episode 1 | Eruption
1824 - Unknown Evidence from Observations: Reported
 A major explosive eruption took place in 1824 (Coats, 1950).

List of 2 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
1824    - - - - VEI (Explosivity Index)

[ 1817 ] Uncertain Eruption

Episode 1 | Uncertain
1817 - Unknown Evidence from Unknown
 Reports of "smoke" may have been vapor condensation clouds (Coats, 1950).

List of 1 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Volcanic "smoke"
Deformation History

There is data available for 1 deformation periods. Expand each entry for additional details.


Deformation during 2004 - 2009 [Subsidence; Observed by InSAR]

Start Date: 2004 Stop Date: 2009 Direction: Subsidence Method: InSAR
Magnitude: Unknown Spatial Extent: Unknown Latitude: Unknown Longitude: Unknown

Remarks: Subsidence on the north flank due to contraction of 1937 lava flow.

Figure (see Caption)

Averaged deformation images of Yunaska Island produced by stacking all available InSAR images from 2004?2009 from the following tracks: a track 036 (ascending), b track 158 (descending), c track 265 (ascending), and d track 430 (descending). Dashed line delineates subsiding area on the north flank of Yunaska volcano extending from nearly the rim of Caldera II to the north shore. A full cycle of colors (i.e., one interferometric fringe) represents 28 mm/year of surface displacement along the LOS

From: Lu and Dzurisin 2014.


Reference List: Lu and Dzurisin 2014.

Full References:

Lu Z, Dzurisin D, 2014. InSAR imaging of Aleutian volcanoes: monitoring a volcanic arc from space. Springer-Verlag Berlin Heidelberg. https://doi.org/10.1007/978-3-642-00348-6

Emission History

There is no Emissions History data available for Yunaska.

GVP Map Holdings

Maps are not currently available due to technical issues.

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.

Smithsonian Sample Collections Database

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

External Sites