Report on Fukutoku-Oka-no-Ba (Japan) — May 1978
Scientific Event Alert Network Bulletin, vol. 3, no. 5 (May 1978)
Managing Editor: David Squires.
Fukutoku-Oka-no-Ba (Japan) Water discoloration observed October-December 1977 and January 1978
Please cite this report as:
Global Volcanism Program, 1978. Report on Fukutoku-Oka-no-Ba (Japan) (Squires, D., ed.). Scientific Event Alert Network Bulletin, 3:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197805-284130.
24.285°N, 141.481°E; summit elev. -29 m
All times are local (unless otherwise noted)
Discoloration was observed on 14 October 1977, 15 and 25 November 1977, 8 and 23 December 1977, and 10, 24, and 25 January 1978.
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.