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Report on Fukutoku-Oka-no-Ba (Japan) — October 1985

Scientific Event Alert Network Bulletin, vol. 10, no. 10 (October 1985)
Managing Editor: Lindsay McClelland.

Fukutoku-Oka-no-Ba (Japan) Discolored water

Please cite this report as:

Global Volcanism Program, 1985. Report on Fukutoku-Oka-no-Ba (Japan). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 10:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198510-284130.

Volcano Profile |  Complete Bulletin


Fukutoku-Oka-no-Ba

Japan

24.285°N, 141.481°E; summit elev. -29 m

All times are local (unless otherwise noted)


A milky white discoloration, about 100 m in diameter, was observed on 17 September and discoloration was noted again on 17 October.

Geologic Background. Fukutoku-Oka-no-ba is a submarine volcano located 5 km NE of the pyramidal island of Minami-Ioto. Water discoloration is frequently observed from the volcano, and several ephemeral islands have formed in the 20th century. The first of these formed Shin-Ioto ("New Sulfur Island") in 1904, and the most recent island was formed in 1986. The volcano is part of an elongated edifice with two major topographic highs trending NNW-SSE, and is a trachyandesitic volcano geochemically similar to Ioto.

Information Contacts: JMA, Tokyo.