RVO reported that white vapor emissions from Bagana continued during 10 January-9 March. Emissions were occasionally forceful, and on 3 March were accompanied by an ash cloud that drifted E. Summit incandescence was visible on 7 and 8 March. Based on satellite imagery, the Darwin VAAC reported that a diffuse plume rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted WSW on 10 March.

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.

Sources: Rabaul Volcano Observatory (RVO), Darwin Volcanic Ash Advisory Centre (VAAC)