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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.
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.
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.
|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 (www.pmel.noaa.gov/vents/chemistry/images/).
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.