Report on Fukutoku-Oka-no-Ba (Japan) — March 1979
Scientific Event Alert Network Bulletin, vol. 4, no. 3 (March 1979)
Managing Editor: David Squires.
Fukutoku-Oka-no-Ba (Japan) Sea water discoloration
Please cite this report as:
Global Volcanism Program, 1979. Report on Fukutoku-Oka-no-Ba (Japan). In: Squires, D. (ed.), Scientific Event Alert Network Bulletin, 4:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN197903-284130.
24.285°N, 141.481°E; summit elev. -29 m
All times are local (unless otherwise noted)
Aerial reconnaissance by the JMSA in late January showed slight discoloration of the ocean around this volcano, at 24.30°N, 141.48°E.
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, Meteorolgical Research Institute, Tokyo; D. Shackelford, CA.