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Report on Additional Reports (Unknown) — December 1986

Additional Reports

Scientific Event Alert Network Bulletin, vol. 11, no. 12 (December 1986)
Managing Editor: Lindsay McClelland.

Additional Reports (Unknown) South China Sea: Pumice from unknown source clogs ship's intakes

Please cite this report as:

Global Volcanism Program, 1986. Report on Additional Reports (Unknown) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 11:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198612-600500

Additional Reports


Lat Unknown, Unknown; summit elev. m

All times are local (unless otherwise noted)

On 28 August 1986, floating pumice at 16.47°N, 110.40°E blocked the water inlet filters of the Dutch MV Nedlloyd Colombo, causing severe engine trouble. Samples were collected.

No recent submarine eruption has been reported in the area. The nearest known Holocene volcano is Cu-Lao Re Island at 15.38°N, 109.12°E, 180 km to the SW. A submarine eruption of Fukutoku-okanoba (3,350 km to the ENE) in January built a temporary island and produced considerable quantities of pumice. Teardrop-shaped 10 x 4 km pumice rafts were observed in a NW-SE trending, 200 x 50 km, zone extending 100-300 km SE of the volcano on 28 January. Submarine eruptions at Rumble III in June and Kavachi in July were 9,200 and 6,000 km from the position of the MV Nedlloyd Colombo, and separated from it by numerous intervening islands.

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

Information Contacts: F.B. Koek, Bureau of Marine Affairs, Ministry of Transport and Public Works, Royal Netherlands Meteorological Institute, P.O. Box 201, 3730 AE De Bilt, Netherlands.