Report on Bagana (Papua New Guinea) — March 1984
Scientific Event Alert Network Bulletin, vol. 9, no. 3 (March 1984)
Managing Editor: Lindsay McClelland.
Bagana (Papua New Guinea) Sounds, glow, tephra emissions; but no new lava flows
Please cite this report as:
Global Volcanism Program, 1984. Report on Bagana (Papua New Guinea). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 9:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198403-255020.
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
"The increased activity continued in February and March. Occasional brown and grey tephra emissions were observed, and rumbling and explosion sounds were heard 17 km away. Nighttime summit glows were occasionally seen.
"New lava flows were reported in January, but aerial inspections have failed to confirm these reports. They indicated a relatively static body of lava extending about 200 m from the summit, but this is an old lava flow. The main development of the known active lava flow at Bagana in recent times has been a sharp change in direction of flow on the lower slopes. The nose of the flow is now abutting the dome on the W foot of Bagana after completing a 60°C turn toward the W from the established flow channel on the N flank."
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: C. McKee, RVO.