Report on Bagana (Papua New Guinea) — 12 December-18 December 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 12 December-18 December 2012
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2012. Report on Bagana (Papua New Guinea). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 12 December-18 December 2012. Smithsonian Institution and US Geological Survey.
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
RVO reported that white vapor from Bagana was emitted during 1 November-12 December. Occasional weak incandescence from the crater was observed at night during 3-8, 10, 17-20, and 29-30 November. An eruption during 1200-1300 on 13 December was followed by light ashfall in Arawa (40 km SE) and heavier ashfall in Manetai (11 km E). A small amount of ashfall was reported in Arawa the next day; the volcano was mostly quiet during 14-15 December.
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.
Source: Rabaul Volcano Observatory (RVO)