Paka

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 0.92°N
  • 36.18°E

  • 1697 m
    5566 ft

  • 222053
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Paka.

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

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

The dominantly Pleistocene Paka shield volcano in the Gregory Rift contains a small 1.5-km-wide summit caldera. Eruption of large volumes of trachytic pyroclastic rocks around the end of the Pleistocene and the beginning of the Holocene formed a NW-trending ridge of pyroclastic cones across the summit region; collapse of this area formed the summit caldera and associated craters. A second large crater SE of the caldera is 0.5 x 1 km wide and contains a pumice cone. The summit caldera is narrowly breached on the north side, which has funneled post-caldera lava flows in this direction. The three youngest post-caldera pyroclastic cones on the NE flank may be only a few hundred years old. A series of viscous trachytic lava flows were erupted from vents on the volcano's lower flanks. Young fissure-fed basalts were also erupted to the south, between Paka and Korosi volcanoes. Surficial geothermal activity is widespread at Paka both within the summit caldera and on extensive portions of the northern flank.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
7550 BCE ± 2000 years Unknown Confirmed 4 Ar/Ar

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.



Synonyms
Pakka


Cones
Feature Name Feature Type Elevation Latitude Longitude
Jamakatan Cone
Kasakat Hill Cone
Katalim Cone
Lokukus Vent
Mundi Cone
Muruese Cone


Domes
Feature Name Feature Type Elevation Latitude Longitude
Cheptomas Dome
Muruese (upper left) is a youthful breached pyroclastic cone on the lower SW flank of Paka volcano. It fed this spectacular lobate trachytic lava flow that is 2 km long and 2.5 km wide. The flow is bounded by steep-sided margins and displays prominent concentric pressure ridges. The dominantly Pleistocene trachytic Paka shield volcano in the Gregory Rift contains a small 1.5-km-wide summit caldera that is cut on the SE by a large explosion crater.

Photo by Hunting Aereo Surveys (published in Green and Short, 1971).
Trachytic pumice cones drape the upper NE flanks of Paka volcano in this aerial view from the NW. The dark-colored trachytic lava flow with well-defined flow ridges at the lower right traveled down the north flank of the volcano through a breach in the caldera wall. The 1.5-km-wide summit caldera is visible at the upper right, and a large crater to the SE appears to its left. Areas of brown vegetation are geothermally active.

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.

Hackman B D, 1988. Geology of the Baringo-Laikipia area. Rpt Mines Geol Dept Kenya, 104: 1-79.

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.).

Williams L A J, Macdonald R, Chapman G R, 1984. Late Quaternary caldera volcanoes of the Kenya Rift Valley. J Geophys Res, 89: 8553-8570.

Volcano Types

Shield
Caldera
Pyroclastic cone(s)

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Rock Types

Major
Trachyte / Trachyandesite
Basalt / Picro-Basalt
Minor
Trachyandesite / Basaltic trachy-andesite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
468
4,354
62,835
1,256,175

Affiliated Databases

Large Eruptions of Paka 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.