Report on Bagana (Papua New Guinea) — December 1986
Scientific Event Alert Network Bulletin, vol. 11, no. 12 (December 1986)
Managing Editor: Lindsay McClelland.
Bagana (Papua New Guinea) Lava extrusion probably continuing
Please cite this report as:
Global Volcanism Program, 1986. Report on Bagana (Papua New Guinea) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 11:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198612-255020
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
December observations indicated that the lava extrusion that has been ongoing for most of 1986 was probably continuing. A weak glow was often seen at night. [White and brown emissions] from the summit were moderate to strong.
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: J. Mori and P. Lowenstein, RVO.