Namarunu

Photo of this volcano
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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 1.98°N
  • 36.43°E

  • 817 m
    2680 ft

  • 222040
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Namarunu.

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

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

The largely Pliocene Namarunu trachytic shield volcano is topped by parasitic cones and lava flows of upper Pleistocene and Holocene age. Voluminous basaltic effusive and explosive activity took place during the early Holocene on the lower northern, eastern, and southern flanks along the axis of the East African Rift, producing fissure-controlled subaerial basaltic scoria cones and lava flows, and partially or completely sublacustral tuff cones, tuff rings, and pillow lavas. Fluid olivine basalts were also erupted from a breached scoria cone forming the summit of Namarunu. The youngest eruptions postdated the drying out of Lake Sugata about 3000 years ago. Some could be as recent as the historical eruptions at The Barrier volcano to the north (Dunkley et al., 1993). Hot springs are located on some of the young volcanic cones on the rift valley floor and on the eastern side of the rift along the base of the Tirr Tirr Plateau.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
6550 BCE ± 1500 years Unknown Confirmed   Tephrochronology Lower eastern flanks

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.



Cones
Feature Name Feature Type Elevation Latitude Longitude
Aruba Rock Tuff cone
Crescent, the Tuff ring
Young basaltic lavas, scoria cones, and tuff deposits were erupted along the eastern base of Namarunu volcano along the axis of the East African Rift. This view looks south with the rift margin escarpment of the Tirr Tirr Plateau in the distance at the upper left. Numerous fissure-controlled subaerial basaltic scoria cones and lava flows, as well as partially or completely sublacustral tuff cones, tuff rings, and pillow lavas were erupted along the flanks of the volcano. The youngest eruptions postdated the drying out of Lake Sugata about 3000 years ago.

Photo by Martin Smith, 1993 (copyright British Geological Survey, NERC).

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.

Dunkley P N, Smith M, Allen D A, Darling W G, 1993. The geothermal activity and geology of the northern sector of the Kenya Rift Valley. Brit Geol Surv Res Rpt, SC/93/1: 1-185.

Key R M, 1987a. Geology of the Maralal area. Rpt Mines Geol Dept Kenya, 105: 1-93.

Mohr P A, Wood C A, 1976. Volcano Spacings and Lithospheric Attenuation in the Eastern Rift of Africa. Earth Planet Sci Lett, 33: 126-144.

Smith M, 1991. . (pers. comm.).

Volcano Types

Shield
Pyroclastic cone(s)
Tuff ring(s)

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Rock Types

Major
Basalt / Picro-Basalt
Trachyte / Trachyandesite
Rhyolite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
47
537
7,073
186,674

Affiliated Databases

Large Eruptions of Namarunu 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.