Report on Bagana (Papua New Guinea) — August 1990
Bulletin of the Global Volcanism Network, vol. 15, no. 8 (August 1990)
Managing Editor: Lindsay McClelland.
Bagana (Papua New Guinea) Summit block lava extrusion and plume emission; reporting problems
Please cite this report as:
Global Volcanism Program, 1990. Report on Bagana (Papua New Guinea). In: McClelland, L. (ed.), Bulletin of the Global Volcanism Network, 15:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199008-255020.
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
"Due to social unrest and political isolation on Bougainville Island Island, instrumental data is no longer being recorded and no reliable reports of visual observation were received. From the sparse reports of observations received between 12 and 27 August, it is presumed that the volcano is still extruding a blocky lava flow from its summit crater with accompanying moderate to strong white to grey plumes, summit night glow, and numerous rockfalls."
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: I. Itikarai and C. McKee, RVO.