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Longonot

Photo of this volcano
  • Country
  • Volcanic Region
  • Landform | Volc Type
  • Last Known Eruption
  • 0.914°S
  • 36.446°E

  • 2,776 m
    9,108 ft

  • 222100
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports available 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 confirmed Holocene eruptive periods.

1863 ± 5 years Confirmed Eruption VEI: 0

Episode 1 | Eruption Northern flank
1863 ± 5 years - Unknown Evidence from Correlation: Anthropology

List of 2 Events for Episode 1 at Northern flank

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Lava flow Uncertain
1863 ± 5 years    - - - - VEI (Explosivity Index)

1330 BCE ± 100 years Confirmed Eruption  

Episode 1 | Eruption
1330 BCE ± 100 years - Unknown Evidence from Isotopic: 14C (uncalibrated)

List of 1 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion

7200 BCE ± 100 years Confirmed Eruption  

Episode 1 | Eruption
7200 BCE ± 100 years - Unknown Evidence from Isotopic: 14C (uncalibrated)

List of 2 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Ash
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 central cone of Longonot volcano was constructed within a large, topographically indistinct caldera. The summit of Longonot, seen here from the north, is the west rim of a 1.8-km-wide summit caldera. Late-stage lava flows were erupted on the northern and SW flanks.

Copyrighted photo by Katia and Maurice Krafft, 1976.
The trachytic Longonot stratovolcano SE of Lake Naivasha contains an 8 x 12 km caldera. A large central cone, seen here from the SW, was constructed within the caldera and forms the summit of the volcano. It is truncated by a circular, 1.8-km-wide caldera. Post-caldera lavas erupted onto its floor give it a flat surface. Masai tradition records a lava flow on the northern flank during the 19th century. Similarly youthful-looking lava flows occur on the SW flank.

Copyrighted photo by Katia and Maurice Krafft, 1976.
The central cone of Longonot volcano is truncated by a small steep-walled caldera that is 1.8-km wide. Erosionally furrowed ash deposits related to the caldera-forming eruptions mantle its slopes. Trachytic lava flows up to 30-m thick that built the central cone can be seen in the far west caldera wall. The caldera floor is covered by post-collapse aa lava flows . A line of small craters extends from the SW wall to the center.

Copyrighted photo by Katia and Maurice Krafft, 1976.
The small summit caldera of Longonot volcano is seen here from the NNE. A circular crater tops a symmetrical cone erupted along a N-S fissure on the upper flanks of Longonot. Fissures lower on the north flank produced the youngest eruption of the volcano during the 19th century.

Copyrighted photo by Katia and Maurice Krafft, 1976.
Longonot as seen from the flanks of Suswa volcano (SSW of Longonot) in 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 on the flanks. Masai tradition records a lava flow on the N flank during the 19th century.

Photo by Tom Jorstad, 1990 (Smithsonian Institution).
GVP Map Holdings

Maps are not currently available due to technical issues.

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.

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