Emi Koussi

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 19.8°N
  • 18.53°E

  • 3415 m
    11201 ft

  • 225021
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Emi Koussi.

The Global Volcanism Program has no Weekly Reports available for Emi Koussi.

The Global Volcanism Program has no Bulletin Reports available for Emi Koussi.

The large volcano of Emi Koussi at the SE end of the Tibesti Range forms the highest summit of the Sahara. The 60 x 80 km massif was constructed over a basement of Cretaceous and Paleozoic sandstones. Two nested calderas, 12 x 15 km in size, truncate the dominantly trachytic volcano, whose 3415 m high point lies on the southern caldera rim of the low-angle pyroclastic shield volcano. The calderas contain several explosion craters, lava domes, and young scoria cones, along with lava flows of recent and pre-modern age (Geze et al., 1959). The spectacular Era Kohor (Trou au Natron du Koussi) caldera on the SE floor of the 2nd caldera is 2-3 km wide and 350 m deep. The latest activity in the calderas produced three maars, and numerous basaltic cinder cones and associated lava flows have been constructed both within the calderas and on their outer flanks. The Yi-Yerra thermal area is located on the southern flank.

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



Craters
Feature Name Feature Type Elevation Latitude Longitude
Era Kohor
    Trou Au Natron Au Koussi
Caldera 19° 42' 0" N 18° 33' 0" E


Thermal
Feature Name Feature Type Elevation Latitude Longitude
Yi-Yerra Thermal 850 m 19° 23' 0" N 18° 40' 0" E
The vertical stabilizer of the Space Shuttle Endeavor almost appears to point out the summit caldera of Emi Koussi volcano in the Tibesti Mountains of Chad. Emi Koussi lies at the SE end of the Tibesti Range; its 3415-m-high summit is the highest in the Sahara. Nested 12 x 15 km wide calderas at the summit contain large explosion craters and young basaltic scoria cones.

NASA Space Shuttle image STS108-701-008, 2001 (http://eol.jsc.nasa.gov/).

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.

Geze B, Hudeley H, Vincent P, Wacrenier P, 1959. Les volcacans du Tibesti (Sahara du Tchard). Bull Volc, 22: 135-172.

Gourgaud A, Vincent P M, 2004. Petrology of two continental alkaline intraplate series at Emi Koussi volcano, Tibesti, Chad. J Volc Geotherm Res: 129: 261-290.

Permenter J L, Oppenheimer C, 2007. Volcanoes of the Tibesti massif (Chad, northern Africa). Bull Volc, 69: 609-626.

Vincent P M, 1963. Les volcans Tertiares et Quaternaires de Tibesti occidental et central (Sahara du Tchad). Mem Bur Recherche Geol Min, 23: 1-307.

Volcano Types

Pyroclastic shield
Caldera(s)
Pyroclastic cone(s)
Lava dome(s)
Maar(s)

Tectonic Setting

Intraplate
Continental crust (> 25 km)

Rock Types

Major
Trachyte / Trachyandesite
Rhyolite
Basalt / Picro-Basalt
Andesite / Basaltic Andesite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
8
26
1,616

Affiliated Databases

Large Eruptions of Emi Koussi 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.