Paka

Photo of this volcano
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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.

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude
222053

7550 BCE

1697 m / 5566 ft

0.92°N
36.18°E

Volcano Types

Shield
Caldera
Pyroclastic cone(s)

Rock Types

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

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Population

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

Geological Summary

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.

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

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.

Eruptive History


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

Photo Gallery


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).

Smithsonian Sample Collections Database


A listing of samples from the Smithsonian collections will be available soon.

Affiliated Sites

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).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.