Report on Bagana (Papua New Guinea) — 29 March-4 April 2017
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 29 March-4 April 2017
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2017. Report on Bagana (Papua New Guinea) (Sennert, S, ed.). Weekly Volcanic Activity Report, 29 March-4 April 2017. Smithsonian Institution and US Geological Survey.
Papua New Guinea
6.137°S, 155.196°E; summit elev. 1855 m
All times are local (unless otherwise noted)
Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 29 March an ash plume from Bagana rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted SW. On 31 March a NOTAM (notice to airmen) and pilot report suggested that an ash plume rose to an altitude of 2.1 km though ash was not identified in mostly clear satellite images. An ash plume observed on 2 April rose to an altitude of 2.1 km and drifted almost 40 km E.
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.