Tolguaca

Photo of this volcano
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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 38.31°S
  • 71.645°W

  • 2806 m
    9204 ft

  • 357093
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: March 1987 (SEAN 12:03)


Active solfatara field found

An active solfataric field was detected in one of Tolguaca's NW craters (at 38.29°S, 71.67°W) during a March 1986-January 1987 geologic study. Several vents up to 2 m wide covered an area of ~200 m2. The vents emitted boiling water, high pressure steam, and H2S, with a jet-like noise. The entire area showed intense alteration and a small amount of sulfur deposition.

Information Contacts: H. Moreno, Univ de Chile.

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

Index of Bulletin Reports


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.

03/1987 (SEAN 12:03) Active solfatara field found




Bulletin Reports

All information contained in these reports is preliminary and subject to change.


03/1987 (SEAN 12:03) Active solfatara field found

An active solfataric field was detected in one of Tolguaca's NW craters (at 38.29°S, 71.67°W) during a March 1986-January 1987 geologic study. Several vents up to 2 m wide covered an area of ~200 m2. The vents emitted boiling water, high pressure steam, and H2S, with a jet-like noise. The entire area showed intense alteration and a small amount of sulfur deposition.

Information Contacts: H. Moreno, Univ de Chile.

Tolguaca is a late-Pleistocene to Holocene stratovolcano located immediately NW of Lonquimay volcano. Only fumarolic activity has occurred from basaltic-andesitic Tolguaca during historical time. A NW-SE zone of aligned summit craters is youngest to the NW. Another group of vents cutting the south and east flanks is oriented SW-NE, parallel to the zone of flank vents on nearby Lonquimay volcano, and is of postglacial age (Moreno and Gardeweg 1989). Reports of eruptions in 1876 and on January 7, 1933, have not been confirmed. The latter date probably refers to an eruption of Lonquimay or Llaima volcanoes (Petit-Breuilh 1994, pers. comm.). The glacially eroded surface of Tolguaca contrasts with its neighbor of similar height, Lonquimay, and attests to its older age.

The Global Volcanism Program is not aware of any Holocene eruptions from Tolguaca. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Tolguaca page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

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.


Synonyms

Tolhuaca

Cones

Feature Name Feature Type Elevation Latitude Longitude
Caracol, Volcán Cone 1473 m 38° 21' 0" S 71° 41' 0" W
Holandesa, Volcán la Cone 1600 m 38° 18' 0" S 71° 32' 0" W
Lolco, Volcan Cone 1325 m 38° 17' 0" S 71° 30' 0" W
Verde, Volcán Laguna Cone 1735 m 38° 20' 0" S 71° 36' 0" W
Tolguaca volcano, the snow-capped peak at the left, is a late-Pleistocene to Holocene stratovolcano located immediately NW of Lonquimay volcano. The cinder cone at the right in this view from the SE is the Navidad cone on the NE flank of Lonquimay, which formed during an eruption in 1989. The 2806-m-high Tolguaca is older than its neighbor Lonquimay. It is dissected by glaciers and only fumarolic activity has occurred during historical time. Flank vents are oriented NW-SE, in line with Lonquimay, and SW-NE-trending vents occur on the south flank.

Photo by Norm Banks, 1990 (U.S. Geological Survey).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

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

Moreno H, 1974. Airplane flight over active volcanoes of central-south Chile. Internatl Symp Volc Andean & Antarctic Volc Problems Guidebook, Excur D-3, 56 p.

Moreno H, Gardeweg M C, 1989. La erupcion reciente en el complejo volcanico Lonquimay (Diciembre 1988-), Andes del Sur. Rev Geol Chile, 16: 93-117.

Moreno H, Naranjo J A, 1991. The southern Andes volcanoes (33°-41° 30' S), Chile. 6th Geol Cong Chile, Excur PC-3, 26 p.

Petit-Breuihl M E, 1994. . (pers. comm.).

Smithsonian Institution-SEAN, 1975-89. [Monthly event reports]. Bull Scientific Event Alert Network (SEAN), v 1-14.

Volcano Types

Stratovolcano
Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
82
494
13,873
567,185

Affiliated Databases

Large Eruptions of Tolguaca 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).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.