Report on Bagana (Papua New Guinea) — July 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 7 (July 1987)
Managing Editor: Lindsay McClelland.
Bagana (Papua New Guinea) Vapor emissions continue; no incandescence seen
Please cite this report as:
Global Volcanism Program, 1987. Report on Bagana (Papua New Guinea) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 12:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198707-255020
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
Activity may have declined in July although moderate to strong, thick, white, vapor emissions were observed throughout the month. No sounds were heard and no night glow from the summit crater was seen. Night glow . . . is thought to be evidence of lava flow activity.
Geological Summary. Bagana volcano, in a remote portion of central Bougainville Island, is frequently active. 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 characterized by non-explosive effusion of viscous lava that maintains a small lava dome in the summit crater, although occasional explosive activity produces pyroclastic flows. Lava flows with tongue-shaped lobes up to 50 m thick and prominent levees descend the flanks on all sides.
Information Contacts: B. Talai and P. Lowenstein, RVO.