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Nikko volcanosubmarine volcano -391 m / -1,283 ft
Volcano Islands, Japan, 23.08°N / 142.31°E Current status: dormant (1 out of 5) [hide map] [enlarge map]
Typical eruption style: fumarolic
Nikko volcano eruptions: 1979 (?) Last earthquakes nearby:
Background:from Smithsonian / GVP volcano information:Nikko submarine volcano is a massive seamount that rises from nearly 3 km depth to within 391 m of the sea surface at the SE end of a submarine ridge segment extending from Minami-Iwo-jima island. Two large cones at the basaltic-to-andesitic volcano have been constructed on the NW and NE rims of a roughly 3-km-wide, flat-floored submarine caldera, whose rim is prominently displayed on the southern side, but largely buried on the north. A smaller cones lies on the SE caldera floor. The larger NW cone lies within a partially buried crater and displays hydrothermal activity. Discolored water was observed above Nikko seamount in July 1979, but no water discoloration has been observed during semi-regular seasonal reconnaissance flights since then. Hydrothermal venting was documented during a recent NOAA expedition. |
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