Igwisi Hills

No photo available for this volcano
Google Earth icon
  Google Earth Placemark
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 4.891°S
  • 31.93°E

  • 1145 m
    3756 ft

  • 222161
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Igwisi Hills.

The Global Volcanism Program has no Weekly Reports available for Igwisi Hills.

The Global Volcanism Program has no Bulletin Reports available for Igwisi Hills.

Volcano Types

Pyroclastic cone(s)

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Rock Types



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

Geological Summary

Three kimberlitic pyroclastic cones of late Pleistocene or Holocene age are located in the Igwisi Hills, WNW of the city of Tabora in NW Tanzania. The volcanoes were erupted along a NE-SW-trending rift through a precambrian granitic gneiss basement and are located on the western side of the Tanzanian Craton far from other Tanzanian volcanoes, which are located near the Gregory Rift. Two pyroclastic cones with well-preserved craters rising 15 to 45 m above the plain occur at Igwisi, with a central cone and crater adjacent to the NE crater that contains a solidified lava lake. The NE crater is the largest, 370 m in diameter, and has been breached on the ENE side, the source of a small lava flow about 1 km in length and width. The SW crater is also breached on the ENE side, with a smaller lava flow on the east flank. Cosmogenic Helium ages for the Igwisi Hills eruption with wide uncertainties range from late Pleistocene to mid Holocene.

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

The Global Volcanism Program has no synonyms or subfeatures listed for Igwisi Hills.

The Global Volcanism Program has no photographs available for Igwisi Hills.


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.

Brown R J, Manya S, Buisman I, Fontana G, Field M, Mac Niocaill C, Sparks R S J, Stuart F M, . Eruption of kimberlite magmas: physical volcanology, geomorphology and age of the youngest kimberlitic volcanoes known on earth (the Upper Pleistocene/Holocene Igwisi Hills volcanoes, Tanzania). Bull Volc, 74: 1621-1643.

Dawson J B, 1994. Quaternary kimberlitic volcanism on the Tanzania craton. Contr Mineral Petr, 116: 473-485.

Latter J H, 1975. The history and geography of active and dormant volcanoes. A worldwide catalogue and index of active and potentially active volcanoes, with an outline of their eruptions.. Unpublished manuscript, unpaginated.

Nixon P H, 1973. Kimberlitic volcanoes in East Africa. Overseas Geol Min Res, 41: 119-138.

Sampson D N, 1956. The volcanic hills at Igwisi. Rec Geol Surv Tanganyika 1953, p 48-53.

Affiliated Databases

Large Eruptions of Igwisi Hills 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.