Report on Bagana (Papua New Guinea) — October 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 10 (October 1987)
Managing Editor: Lindsay McClelland.
Bagana (Papua New Guinea) Continuous vapor emissions; weak glow
Please cite this report as:
Global Volcanism Program, 1987. Report on Bagana (Papua New Guinea). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 12:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198710-255020.
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
Following the September pyroclastic avalanches, Bagana emitted continuous moderate-strong white vapour for most of October. Weak glow from the summit was visible during the first 2 weeks of the month. Seismicity was at a low level, except from 15-19 October when a total of 75 events were recorded.
Geologic Background. Bagana volcano, occupying a remote portion of central Bougainville Island, is one of Melanesia's youngest and most active volcanoes. This massive symmetrical cone was largely constructed by an accumulation of viscous andesitic lava flows. The entire edifice could have been constructed in about 300 years at its present rate of lava production. Eruptive activity is frequent and characterized by non-explosive effusion of viscous lava that maintains a small lava dome in the summit crater, although explosive activity occasionally producing pyroclastic flows also occurs. Lava flows form dramatic, freshly preserved tongue-shaped lobes up to 50 m thick with prominent levees that descend the flanks on all sides.
Information Contacts: J. Mori, D. Lolok, and P. Lowenstein, RVO.