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Minami Kasuga volcanVolcan sous-marin -274 m / -899 ft
Volcano Islands, Japon, 21.6°N / 143.64°E Condition actuelle: en sommeil (1 sur 5)
Style éruptif tipique: effusive & explosive ?
Eruptions du volcan Minami Kasuga: unknown, probably less than 1000 years ago Derniers séismes proches:
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. Introduction: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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