Report on Bagana (Papua New Guinea) — July 1990
Bulletin of the Global Volcanism Network, vol. 15, no. 7 (July 1990)
Managing Editor: Lindsay McClelland.
Bagana (Papua New Guinea) Blocky lava overflows onto SE and E flanks
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, 15:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199007-255020.
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
"Activity continued at a steady level in July. White and grey emissions were released during most days from the summit, accompanied by low rumbling noises. Explosions occurred on 3, 13, 16-18, 20, 25, and 26 July, producing brown to black plumes. A weak red glow was observed over the crater on most nights.
"The blocky lava flow being slowly extruded from the summit crater was seen on two occasions to overflow onto the SE and E flanks, with rockfalls reported on most days."
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: H. Patia and C. McKee, RVO.