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Ugashik-Peulik

Photo of this volcano
  • United States
  • Alaska Peninsula Volcanic Arc
  • Composite | Stratovolcano
  • 1814 CE
  • Country
  • Volcanic Province
  • Landform | Volc Type
  • Last Known Eruption
  • 57.751°N
  • 156.368°W

  • 1474 m
    4836 ft

  • 312130
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Weekly Report: 12 May-18 May 2021 Citation IconCite this Report

On 12 May AVO changed the Aviation Color Code and Volcano Alert Level for Ugashik-Peulik to Green and Normal, respectively, reflecting that communication with seismic stations had been re-established, allowing for the location of earthquakes and detection of unrest.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Weekly Reports - Index


2021: April | May


12 May-18 May 2021 Citation IconCite this Report

On 12 May AVO changed the Aviation Color Code and Volcano Alert Level for Ugashik-Peulik to Green and Normal, respectively, reflecting that communication with seismic stations had been re-established, allowing for the location of earthquakes and detection of unrest.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


14 April-20 April 2021 Citation IconCite this Report

AVO reported a loss of operation and communication with seismic stations that monitor Ugashik-Peulik, likely caused by snow cover. Both the Aviation Color Code and the Volcano Alert Level were changed to Unassigned on 19 April, reflecting the inability to locate earthquakes to detect unrest. Monitoring will continue with the remaining seismic stations, regional infrasound networks, lightning detection, and satellite images.

Source: US Geological Survey Alaska Volcano Observatory (AVO)


The Global Volcanism Program has no Bulletin Reports available for Ugashik-Peulik.

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 4 confirmed Holocene eruptive periods.

[ 1852 ] Uncertain Eruption

Episode 1 | Eruption Episode Peulik
1852 - Unknown Evidence from Unknown

List of 1 Events for Episode 1 at Peulik

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

1814 Confirmed Eruption Max VEI: 3

Episode 1 | Eruption Episode Peulik
1814 - Unknown Evidence from Observations: Reported

List of 2 Events for Episode 1 at Peulik

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
1814    - - - - VEI (Explosivity Index)

1050 ± 100 years Confirmed Eruption  

Episode 1 | Eruption Episode Peulik
1050 ± 100 years - Unknown Evidence from Isotopic: 14C (uncalibrated)

List of 2 Events for Episode 1 at Peulik

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Ash

5850 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode Peulik
5850 BCE (?) - Unknown Evidence from Isotopic: 14C (uncalibrated)

List of 2 Events for Episode 1 at Peulik

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Ash

6550 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode Peulik
6550 BCE (?) - Unknown Evidence from Isotopic: 14C (uncalibrated)

List of 2 Events for Episode 1 at Peulik

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Ash
Deformation History

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


Deformation during 1996 - 1998 [Uplift; Observed by InSAR]

Start Date: 1996 Stop Date: 1998 Direction: Uplift Method: InSAR
Magnitude: 20.000 cm Spatial Extent: Unknown Latitude: Unknown Longitude: Unknown

Remarks: Uplift event preceded the 1998 Becharof Lake earthquake swarm.

Figure (see Caption)

(Top row) Examples of observed and (bottom row) best-fit synthetic ERS interferograms of Ugashik-Mount Peulik volcanic center. Dates of image acquisitions are in yyyymmdd format: a 19960903_9970715 (track 315) b 19961018_19970923 (track 315) c 19970923_19980804 (track 315), and d 19950725_19980819 (track 021). Synthetic interferograms were produced using a Mogi (1958) source about 7 km BSL and beneath the center of Ugashik caldera. Areas lacking interferometric coherence are uncolored. A full cycle of colors (i.e., one interferometric fringe) represents 28 mm LOS surface displacement

From: Lu and Dzurisin 2014.


Reference List: Lu and Dzurisin 2014, Lu et al. 2002.

Full References:

Lu, Z., T. Masterlark, J. Power, D. Dzurisin, and C. Wicks,, 2002. Subsidence at Kiska volcano, Western Aleutians, Detected by Satellite Radar Interferometry. Geophysical Research Letters, 29, no. 18, 1855. https://doi.org/10.1029/2002GL014948

Emission History

There is no Emissions History data available for Ugashik-Peulik.

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

The following 5 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.

Catalog Number Sample Description Lava Source Collection Date
NMNH 117233-100 Dacite Peulik Volcano --
NMNH 117233-101 Dacite Peulik Volcano --
NMNH 117233-102 Basalt Peulik Volcano --
NMNH 117233-103 Basalt Peulik Volcano --
NMNH 117233-99 Dacite Peulik Volcano --
External Sites