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Southern EPR-Segment I

Southern EPR at 18.5°S (Segment I)

Fissure vent · Undersea Features · 2600m (submarine)

Black smoker vents emitting low-chlorinity fluids at 374°C were photographed at the "RM28" site at 18°26’S on Segment I of the Southern East Pacific Rise in November 1994 from the Japanese submersible Shinkai 6500. The narrow axial crest of Segment I of the Southern East Pacific Rise in some places is less than 50 m wide. The largest lava flow field in this area is the Animal Farm flow, named after a thriving low-temperature hydrothermal site discovered during a 1993 submersible expedition.
Black smoker vents emitting low-chlorinity fluids at 374°C were photographed at the "RM28" site at 18°26’S on Segment I of the Southern East Pacific Rise in November 1994 from the Japanese submersible Shinkai 6500. The narrow axial crest of Segment I of the Southern East Pacific Rise in some places is less than 50 m wide. The largest lava flow field in this area is the Animal Farm flow, named after a thriving low-temperature hydrothermal site discovered during a 1993 submersible expedition. · 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
2600m (submarine)
Coordinates
-18.530, -113.420
Last eruption
1915
Tectonic setting
Rift zone / Oceanic crust (< 15 km)
Landform
Cluster
Major rock type
Basalt / Picro-Basalt
Geological summary

The narrow axial crest of Segment I of the Southern East Pacific Rise in some places is less than 50 m wide. An axial dome is located along the southern part of the segment. The largest lava flow field in this segment is the Animal Farm flow, named after a thriving low-temperature hydrothermal site discovered during a submersible expedition in 1993. The Animal Farm lava flow was dated by magnetic paleointensity measurements at about 1880-1950 CE, and older flows were dated by similar techniques to the 17th and 19th centuries.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1620~1650 · 1 eruptions · max VEI 01856~1886 · 1 eruptions · max VEI 01886~1915 · 1 eruptions · max VEI 016201679176818271886

Detailed timeline

  1. 1915 (±40 yrs)VEI 0Geological estimate
    1915 – Ongoing
  2. 1860VEI 0Geological estimate
    1860 – Ongoing
  3. 1620VEI 0Geological estimate
    1620 – Ongoing

External links

⚠ For reference only. Not for emergency response.