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Photo of this volcano
  • Kenya
  • Africa and Red Sea
  • Stratovolcano
  • 1863 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.914°S
  • 36.446°E

  • 2776 m
    9108 ft

  • 222100
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Longonot.

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

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

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.

Eruptive History

There is data available for 3 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1863 ± 5 years Unknown Confirmed 0 Anthropology Northern flank
1330 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected)
7200 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected)
Deformation History

There is data available for 1 deformation periods. Expand each entry for additional details.

Deformation during 2004 Jun 28 - 2006 Mar 20 [Uplift; Observed by InSAR]

Start Date: 2004 Jun 28 Stop Date: 2006 Mar 20 Direction: Uplift Method: InSAR
Magnitude: 9.000 cm Spatial Extent: Unknown Latitude: Unknown Longitude: Unknown
Figure (see Caption)

Longonot in 2003?2006 (stack of seven interferograms). Each fringe (blue-red cycle) represents 2.8 cm of displacement in the satellite line of sight.

From: Biggs et al. 2009a.

Reference List: Biggs et al. 2009a.

Full References:

Biggs J, Amelung F, Gourmelen N, Dixon T, 2009. InSAR Observations of 2007 Tanzania Rifting Episode Reveals Mixed Fault and Dyke Extension in an Immature Continental Rift. Geophysical Journal International. https://doi.org/10.1111/j.1365-246X.2009.04262.x

Emission History

There is no Emissions History data available for Longonot.

Photo Gallery

The broad trachytic Longonot stratovolcano SE of Lake Naivasha is seen from the flanks of Suswa volcano (SSW of Longonot) rising above the floor of the Eastern Rift Valley of Kenya. The modern cone was constructed within a broad 8 x 12 km caldera and itself contains a smaller 1.8-km-wide summit crater that gives the summit a flat profile. Post-caldera lavas are found on the caldera floor and the volcano's flanks. Masai tradition records a lava flow on the northern flank during the 19th century.

Photo by Tom Jorstad, 1990 (Smithsonian Institution).
See title for photo information.
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.

Title: Nairobi (Administrative Boundaries Overlay)
Publisher: Survey of Kenya
Country: Kenya
Year: 1980
Series: Y503 (SK60)
Map Type: Topographic
Scale: 1:250,000
Map of Nairobi  (Administrative Boundaries Overlay)

Title: Sakutiek
Publisher: DOS
Country: Kenya-E Af
Year: 1975
Series: Y731 (423)
Map Type: Topographic
Scale: 1:50,000
Map of Sakutiek

Title: Geological Map of the Suswa Area
Publisher: Kenya MENR Mines and Geological Department
Country: Kenya AF
Year: 1970
Map Type: Geology
Scale: 1:125,000
Map of Geological Map of the Suswa Area

Title: Mombasa-Nairobi
Publisher: US Army Map Service
Country: Africa
Year: 1944
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Mombasa-Nairobi
Smithsonian Sample Collections Database

There are no samples for Longonot in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

External Sites