Report on Fukutoku-Oka-no-Ba (Japan) — August 1977
Natural Science Event Bulletin, vol. 2, no. 8 (August 1977)
Managing Editor: David Squires.
Fukutoku-Oka-no-Ba (Japan) Sea surface discoloration in May
Please cite this report as:
Global Volcanism Program, 1977. Report on Fukutoku-Oka-no-Ba (Japan). In: Squires, D. (ed.), Natural Science Event Bulletin, 2:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.NSEB197708-284130.
24.285°N, 141.481°E; summit elev. -29 m
All times are local (unless otherwise noted)
Sea surface discoloration was observed from the air on 1, [12, 13, 16, 17, 21, 22, and 25 May].
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; D. Shackelford, CA.