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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 49.358°S
  • 73.28°W

  • 1500 m
    4920 ft

  • 358061
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Viedma.

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

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

Basic Data

Volcano Number

Last Known Eruption



1988 CE

1500 m / 4920 ft


Volcano Types


Rock Types


Tectonic Setting

Subduction zone
Continental crust (> 25 km)


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

An eruption in 1988 confirmed the presence of a postulated subglacial vent in the Patagonian Icefield NW of Viedma Lake (Kilian, 1991). A previously suggested vent location (Shipton, 1960) turned out to be a glacial nunatak of metamorphic and sedimentary rocks. The Volcán Viedma eruptive center is a subglacial dacitic volcano beneath the Patagonian Icecap west of the spectacular granitic spires of the Cerro Torre, Cerro Fitz Roy area. Only part of the older edifice rises above the surface of the icecap. Four large craters or calderas between 1.5 and 4 km in diameter are located along a N-S line. The 1988 eruption deposited ash and pumice on the Patagonian Icecap and produced a mudflow that reached Viedma Lake.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.

Katsui Y (ed), 1971. List of the World Active Volcanoes. Volc Soc Japan draft ms, (limited circulation), 160 p.

Kilian R, 1991. A volcanic eruption of 1988 on the Viedma glacier in the Patagonian Andes (49° 22' S). Preprint from unknown journal.

Shipton E, 1960. Volcanic activity on the Patagonian ice cap. Geog Jour, 126: 389-396.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1988 Nov 15 ± 45 days Unknown Confirmed   Historical Observations Southernmost crater

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.


Nunatak del Viedma

Photo Gallery

The figure-8-shaped area rising above the Patagonian Icefield at the upper left part of this NASA Landsat mosaic is part of the Viedma volcanic complex. An outflow glacier descends into Lake Viedma at the lower right. This mostly subglacial volcano produced an eruption in 1988 that confirmed the presence of a postulated subglacial vent in the Patagonian Icefield NW of Viedma Lake. The 1988 eruption deposited ash and pumice on the icecap and produced a mudflow that reached Viedma Lake.

NASA Landsat7 image (
Nunatak del Viedma is seen from Paso del Viento with Cordón Mariano Moreno partially hidden within the clouds. The huge lateral moraine of Viedma Glacier lies in the foreground. The glacier surface displays three conspicuous irregular tephra bands distorted by differential movement of the glacier.

Photo by Pedro Skvarca, 1994 (Instituto Antártico Argentino, from U. S. Geol. Survey Prof. Paper 1386-I).

Smithsonian Sample Collections Database

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

Affiliated Sites

Large Eruptions of Viedma Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.