Report on Fukutoku-Oka-no-Ba (Japan) — October 1988
Scientific Event Alert Network Bulletin, vol. 13, no. 10 (October 1988)
Managing Editor: Lindsay McClelland.
Fukutoku-Oka-no-Ba (Japan) Discolored water
Please cite this report as:
Global Volcanism Program, 1988. Report on Fukutoku-Oka-no-Ba (Japan). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 13:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198810-284130.
24.285°N, 141.481°E; summit elev. -29 m
All times are local (unless otherwise noted)
JMSA observed sea discolorations on 12 August in an area of 0.09 x 0.9 km and on 15 September in a zone of 0.05 km (N-S) by 1.8 km (E-W).
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: Y. Sawada, JMA; D. Shackelford, Fullerton, CA.