Report on Fukutoku-Oka-no-Ba (Japan) — December 1993
Bulletin of the Global Volcanism Network, vol. 18, no. 12 (December 1993)
Managing Editor: Edward Venzke.
Fukutoku-Oka-no-Ba (Japan) Discolored water observed over volcano four times in 1993
Please cite this report as:
Global Volcanism Program, 1993. Report on Fukutoku-Oka-no-Ba (Japan) (Venzke, E., ed.). Bulletin of the Global Volcanism Network, 18:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199312-284130.
24.285°N, 141.481°E; summit elev. -29 m
All times are local (unless otherwise noted)
Discolored seawater over an area a few hundred meters wide was seen during monthly aerial observations . . . in February, March, June, and September 1993.
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.