Minami Kasuga Volcano
Updated: Apr 25, 2024 07:00 GMT -
submarine volcano -274 m / -899 ft
Volcano Islands (Japan), 21.6°N / 143.64°E
Current status: normal or dormant (1 out of 5)
Volcano Islands (Japan), 21.6°N / 143.64°E
Current status: normal or dormant (1 out of 5)
Minami Kasuga (South Kasuga, or Kasuga 2) is the central of 3 NNE-SSW trending volcanoes forming the Kasuga seamount chain, which trends SSE from the volcanic front of the Izu-Marianas arc.
The volcano rises from about 3000 m depth to within 170 m of the sea surface and is the highest and largest volume of the 3 volcanoes.
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Minami Kasuga volcano eruptions: unknown, probably less than 1000 years ago
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Background
Two subsidiary cones are located low on the eastern flank. The morphology of Minami Kasuga is more complex than Kasuga 1 volcano to the north, and prominent ridges separate slopes of interspersed volcaniclastic and lava flow fields. Radionuclide decay rates indicate an age for Minami Kasuga of less than 8000 years and probably less than 1000 years; radium/thorium disequilibrium ratios suggest the flows may be only a few centuries old (Fryer et al., 1997). Active hydrothermal fields are located at the summit of Minami Kasuga, at the base of summit ridges, and on the lower flanks.---
Fryer P, Gill J B, Jackson M C, 1997. Volcanological and tectonic evolution of the Kasuga seamounts, northern Mariana Trough: Alvin submersible investigations. J Volc Geotherm Res, 79: 277-311
from: Smithsonian / GVP volcano information
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