Southern EPR-Segment K

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 17.436°S
  • 113.206°W

  • -2566 m
    -8416 ft

  • 334120
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Southern EPR-Segment K.

The Global Volcanism Program has no Weekly Reports available for Southern EPR-Segment K.

The Global Volcanism Program has no Bulletin Reports available for Southern EPR-Segment K.

Basic Data

Volcano Number

Last Known Eruption



1990 CE

-2566 m / -8416 ft


Volcano Types

Fissure vent(s)

Rock Types

Basalt / Picro-Basalt

Tectonic Setting

Rift zone
Oceanic crust (< 15 km)


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

Lava flows from a very recent volcanic eruption were observed in 1994 along segment K of the southern East Pacific Rise. This segment of the mid-ocean ridge north of the Easter microplate displays the broadest cross-sectional area and the shallowest depth (2566 m) of the southern East Pacific Rise between 13 degrees 40 minutes and 18 degrees 30 minutes south. Glassy, unsedimented lava flows on the 17.5 degrees S segment of the East Pacific Rise were considered from biological observations and chemical analyses of the plume and vent fluids to have been erupted within 2-3 years of a November-December 1993 plume survey. Lava was erupted along two segments of the mid-ocean ridge, a 4-km-long flow at the southern site and a 5-10 km long flow at the northern site. Numerous low- and high-temperature hydrothermal vents are active along this segment of the mid-ocean ridge.


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

Bowles J, Gee J S, Kent D V, Bergmanis E, Sinton J, 2005. Cooling rate effects on paleointensity estimates in submarine basaltic glass and implications for dating young flows. Geochem Geophys Geosyst, 6: Q07002, doi:10.1029/2004GC000900.

Embley R W, Lupton J E, Massoth G, Urabe T, Tunnicliffe V, Butterfield D A, Shibata T, Okano O, Kinoshita M, Fujioka K, 1998. Geological, chemical, and biological evidence for recent volcanism at 17.5° S: East Pacific Rise. Earth Planet Sci Lett, 163: 131-147.

Sinton J M, Smaglik S M, Mahoney J J, Macdonald K C, 1991. Magmatic processes at superfast spreading Mid-Ocean Ridges: glass compositional variations along the East Pacific Rise 13°-23° S. J Geophys Res, 96: 6133-6155.

Sinton J, Bergmanis E, Rubin K, Batiza R, Gregg T K P, Gronvold K, Macdonald K C, White S M, 2002. Volcanic eruptions on mid-ocean ridges: new evidence from the superfast spreading East Pacific Rise, 17°-19° S. J Geophys Res, 107: 2115, doi:10.1029/2000JB000090.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1990 ± 2 years Unknown Confirmed 0 Historical Observations Aldo-Kihi lava flow
1965 (?) Unknown Confirmed 0 Magnetism South of Aldo-Kihi lava flow
1930 (?) Unknown Confirmed 0 Magnetism North of Aldo-Kiri lava flow
1840 (?) Unknown Confirmed 0 Magnetism North of Aldo-Kiri lava flow
1625 (?) Unknown Confirmed 0 Magnetism South of Aldo-Kihi lava flow

The Global Volcanism Program has no synonyms or subfeatures listed for Southern EPR-Segment K.

Photo Gallery

Shrimp swimming above a hydrothermally active crack in basalt on the Southern East Pacific Rise near 17 deg 27 min S were photographed in November 1994 from the Japanese submersible Shinkai 6500. Both shrimp and crab were seen to enter and exit similar cracks in this area. Lava flows from a very recent volcanic eruption were observed in 1994 along segment K of the Southern East Pacific Rise.

Image courtesy of NOAA Vents Program, 1994 (

Smithsonian Sample Collections Database

There are no samples for Southern EPR-Segment K in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites

Large Eruptions of Southern EPR-Segment K 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.