Southern EPR-Segment J

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 18.175°S
  • 113.35°W

  • -2650 m
    -8692 ft

  • 334130
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

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

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

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

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude
334130

1890 CE

-2650 m / -8692 ft

18.175°S
113.35°W

Volcano Types

Submarine
Fissure vent(s)

Rock Types

Major
Basalt / Picro-Basalt

Tectonic Setting

Rift zone
Oceanic crust (< 15 km)

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
0
0

Geological Summary

The axial crest of Segment J of the Southern East Pacific Rise consists of an asymmetrical shallow graben varying from 250 to 600 m wide with walls about 20 m high. Horst and graben structures expose cooled lava lakes and both active and extinct hydrothermal chimneys. Basaltic lava flow fields, lava pillars, and pillow mounds are found on the floor of the graben. The largest lava flow field is the Moai lava flow at about 18 deg 12 min S. Two lava flows in Segment J have been dated by paleomagnetic evidence at about 1820 and 1890 AD.

References

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.

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
1890 (?) Unknown Confirmed 0 Magnetism
1820 (?) Unknown Confirmed 0 Magnetism

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

Photo Gallery


"Black smoker" vents (high chlorinity fluids) were photographed at the "RM29" site at 18 deg 10 min S. This image was taken in November 1994 from the Japanese submersible Shinkai 6500. The axial crest of Segment J of the Southern East Pacific Rise consists of an asymmetrical shallow graben varying from 250 to 600 m wide with walls about 20 m high.

Image courtesy of NOAA Vents Program, 1994 (www.pmel.noaa.gov/vents/chemistry/images/).

Smithsonian Sample Collections Database


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

Affiliated Sites

Large Eruptions of Southern EPR-Segment J 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.