Antisana

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.481°S
  • 78.141°W

  • 5753 m
    18870 ft

  • 352030
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Antisana.

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

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

Antisana is a massive, glacier-covered stratovolcano NE of Cotopaxi, along the western margin of the Cordillera Real, 50 km SE of Quito. An older edifice forming the east side of the volcano was constructed over granitic and metasedimentary rocks and is itself overtopped on its NW side by the modern edifice. Two small calderas, one breached to the south and the other to the NE, truncate the older edifice. Viscous, youthful block lava flows have issued from radial fissures on the flanks of 5753-m-high Antisana, one of the highest peaks in Ecuador. The only unequivocal historical eruption took place from 1801 to 1802, when a lava flow was erupted from a vent NNE of the summit. Eighteenth-century eruptions occurred SW of Antisana, in the Chacana caldera.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1801 (?) 1802 May (?) Confirmed   Unknown Volcano Uncertain: possibly Reventador
1748 (in or before) Unknown Confirmed   Unknown Volcano Uncertain: possibly Reventador
[ 1728 ] [ Unknown ] Uncertain 0  

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

Antizana

Thermal

Feature Name Feature Type Elevation Latitude Longitude
Quebrada del Azufre Grande Thermal
The floor of the massive Chacana caldera is seen here in the foreground, looking SE with glacier-covered Antisana volcano in the distance. Chacana is a 32 x 24 km caldera complex of Pliocene-Holocene age. Its outer flanks extend over 50 km, making it one of the largest rhyolitic centers of the northern Andes. Numerous lava domes were constructed within the caldera, which has been the source of frequent Holocene explosive eruptions. Dacitic lava flows were erupted during the 18th century and numerous hot springs are found on the caldera floor.

Photo by Minard Hall, 1976 (Escuela Politécnica Nacional, Quito).
Massive, 5753-m-high Antisana volcano is seen here from its SW on the northern flank of Cotopaxi volcano. The glacier-clad Antisana was constructed immediately SE of Chacana caldera, the largest rhyolitic center of the northern Andes, which lies beyond the jagged ridge left of Antisana. The only unequivocal historical eruption of Antisana occurred in 1801-02 from a vent NNE of the summit.

Photo by John Ewert, 1992 (U.S. Geological Survey).
Antisana is a massive, glacier-covered stratovolcano NE of Cotopaxi. The 1.4 x 1.8 km summit crater, seen here from the north, is breached to the SE. Viscous, youthful block lava flows have issued from radial fissures on the flanks of 5753-m-high Antisana. The only unequivocal historical eruption took place from 1801 to 1802. Eighteenth-century eruptions occurred NW of Antisana within Chacana caldera, which lies beneath the cloud bank in the foreground.

Photo by Minard Hall, 1975 (Escuela Politécnica Nacional, Quito).
Antisana volcano is one of four massive glacier-covered stratovolcanoes constructed along a N-S line at the western edge of Ecuador's Cordillera Real. Its summit crater is breached to the SE, behind the summit in this view from the NW. Its only unequivocal historical eruption produced a lava flow from a NNE-flank vent at the beginning of the 19th century.

Photo by Minard Hall, 1979 (Escuela Politécnica Nacional, Quito).

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.

Barragan R, Geist D, Hall M, Larson P, Kurz M, 1998. Subduction controls on the compositions of lavas from the Ecuadorian Andes. Earth Planet Sci Lett, 154: 153-166.

Bourdon E, Eissen J-P, Monzier M, Robin C, Martin H, Cotten J, Hall M L, 2002. Adakite-like lavas from Antisana volcano (Ecuador): evidence for slab metasomatism beneath the Andean Northern Volcanic Zone. J Petr, 43: 199-217.

Hall M L, 1977. El Volcanismo en El Ecuador. Quito: Biblioteca Ecuador, 120 p.

Hall M L, 1992. . (pers. comm.).

Hantke G, Parodi I, 1966. Colombia, Ecuador and Peru. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 19: 1-73.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Volcano Types

Stratovolcano
Caldera(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Dacite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
232
2,220
56,154
3,314,142

Affiliated Databases

Large Eruptions of Antisana 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.