Report on Minami-Hiyoshi (Japan) — December 1990
Bulletin of the Global Volcanism Network, vol. 15, no. 12 (December 1990)
Managing Editor: Lindsay McClelland.
Minami-Hiyoshi (Japan) No water discoloration seen in 1990
Please cite this report as:
Global Volcanism Program, 1990. Report on Minami-Hiyoshi (Japan) (McClelland, L., ed.). Bulletin of the Global Volcanism Network, 15:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199012-284131.
23.5°N, 141.935°E; summit elev. -107 m
All times are local (unless otherwise noted)
No discolorations were observed at . . . Minami-Hiyoshi . . . during 1990.
Geologic Background. Periodic water discoloration and water-spouting have been reported over this submarine volcano since 1975, when detonations and an explosion were also reported. It lies near the SE end of a coalescing chain of youthful seamounts, and is the only historically active vent. The reported depth of the summit of the trachyandesitic volcano has varied between 274 and 30 m. The morphologically youthful seamounts Kita-Hiyoshi and Naka-Hiyoshi lie to the NW, and Ko-Hiyoshi to the SE.
Information Contacts: Hydrographic Department, JMSA.