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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) (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."

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: H. Patia and C. McKee, RVO.