Illiniza

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.659°S
  • 78.714°W

  • 5248 m
    17213 ft

  • 352041
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Illiniza.

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

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

The twin glacier-covered peaks of Iliniza volcano form prominent landmarks west of the Interandean valley. Iliniza Norte lies 1.8 km NNW of the higher peak, 5248-m Iliniza Sur. The dominantly andesitic-to-dacitic Iliniza is largely, if not entirely Pleistocene in age. However, the Tishigcuchi (Rasuyacu) lava dome on the south flank was active during the Holocene. Recent work suggests that Iliniza itself, which is substantially eroded, may have had relatively young eruptions (Hall 1987, pers. comm.). Iliniza Norte is a remnant of the main volcanic edifice, and the younger Iliniza Sur is an andesitic-dacitic stratovolcano surrounded by thick pyroclastic-flow deposits. An explosive eruption formed a small caldera, which is partially filled by a lava dome forming the summit of Iliniza Sur. Two lava domes are found on the southern and NE flanks of the complex.

The Global Volcanism Program is not aware of any Holocene eruptions from Illiniza. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Illiniza 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

Ilinitza | Iliniza

Cones

Feature Name Feature Type Elevation Latitude Longitude
Illiniza Norte Stratovolcano 5126 m 0° 38' 44" S 78° 43' 5" W
Illiniza Sur Stratovolcano 5248 m 0° 39' 34" S 78° 42' 49" W

Domes

Feature Name Feature Type Elevation Latitude Longitude
Pilongo Dome 3935 m
Tishigcuchi
    Rasuyacu
Dome 4185 m 0° 41' 0" S 78° 43' 0" W
Illiniza Sur, seen here from the Interandean valley to its east, is the highest of the twin peaks of Illiniza volcano. A lava dome on its southern flank, Rasuyacu, erupted during the Holocene. Illiniza itself may have had relatively youthful eruptions, although none have been dated.

Photo by Lee Siebert, 1978 (Smithsonian Institution).
The twin peaks of Illiniza volcano form prominent landmarks west of the Interandean Valley. Sharp-peaked, snow-covered Illiniza Sur (right) is the higher of the two peaks. It is seen here from the south with Illiniza Norte to its left. Illiniza is largely, if not entirely Pleistocene in age. However, Rasuyacu lava dome on the south flank was active during the Holocene. Recent work suggests that Illiniza itself, which is substantially eroded, may have had relatively young eruptions.

Photo by Lee Siebert, 1978 (Smithsonian Institution).

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.

Hall M L, 1987. . (pers. comm.).

Hidalgo S, Monzier M, Martin H, Chazot G, Eissen J-P, Cotten J, 2007. Adakitic magmas in the Ecuadorian volcanic front: petrogenesis of the Iliniza volcanic complex (Ecuador). J Volc Geotherm Res, 159: 366-392.

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

Volcano Types

Stratovolcano
Caldera
Lava dome(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Dacite
Minor
Rhyolite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
535
6,034
158,371
3,941,221

Affiliated Databases

Large Eruptions of Illiniza 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.