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Report on Additional Reports (Unknown) — June 1986

Additional Reports

Scientific Event Alert Network Bulletin, vol. 11, no. 6 (June 1986)
Managing Editor: Lindsay McClelland.

Additional Reports (Unknown) Japan: Pumice rafts in the Ryukyu Islands

Please cite this report as:

Global Volcanism Program, 1986. Report on Additional Reports (Unknown) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 11:6. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198606-600500

Additional Reports


Lat Unknown, Unknown; summit elev. m

All times are local (unless otherwise noted)

Pumice rafts have been drifting ashore in the Ryukyu Islands from late May through June 1986. Pumice was observed by JMA weather station personnel on eight islands: Amami-Oshima, Okinawa, Kume, Minami-Daito, Miyako, Ishigaki, Yonaguni, and Iriomote. More pumice has been observed on E coasts (Pacific coasts) than W coasts of the islands. The coarsest pumice was ~20 cm in diameter on Okinawa, but most of the pumice was small. On most islands, some pumice carried shellfish on the surface. No recent eruptions have been reported at volcanoes in and near the Ryukyu Island chain, and the source of the pumice is unknown.

Geological Summary. Reports of floating pumice from an unknown source, hydroacoustic signals, or possible eruption plumes seen in satellite imagery.

Information Contacts: JMA.