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Southern EPR-Segment J

Southern EPR at 18.2°S (Segment J)

Fissure vent · Undersea Features · 2650m (submarine)

Black smoker hydrothermal vents emitting high-chlorinity fluids were photographed at the "RM29" site at 18°10’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.
Black smoker hydrothermal vents emitting high-chlorinity fluids were photographed at the "RM29" site at 18°10’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. · Photo: Image courtesy of NOAA Vents Program, 1994 (www.pmel.noaa.gov/vents/chemistry/images/).
Type
Fissure vent
Country
Undersea Features
Region
Southern Pacific Volcanic Regions / Southern East Pacific Rise Volcanic Province
Elevation
2650m (submarine)
Coordinates
-18.175, -113.350
Last eruption
1890
Tectonic setting
Rift zone / Oceanic crust (< 15 km)
Landform
Cluster
Major rock type
Basalt / Picro-Basalt
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°12'S. Two lava flows have been dated by paleomagnetic evidence at about 1820 and 1890 CE.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1820~1827 · 1 eruptions · max VEI 01883~1890 · 1 eruptions · max VEI 018201834185518691883

Detailed timeline

  1. 1890VEI 0Geological estimate
    1890 – Ongoing
  2. 1820VEI 0Geological estimate
    1820 – Ongoing

External links

⚠ For reference only. Not for emergency response.