Report on Sinabung (Indonesia) — 4 March-10 March 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 4 March-10 March 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Sinabung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 4 March-10 March 2015. Smithsonian Institution and US Geological Survey.
3.17°N, 98.392°E; summit elev. 2460 m
All times are local (unless otherwise noted)
Based on reports from PVMBG, the Darwin VAAC reported that on 5 March an eruption at Sinabung generated a plume that rose 3 km above the summit. Satellite images detected an ash plume that rose to an altitude of 9.1 km (30,000 ft) a.s.l. and drifted 100-230 km WNW and NW. Later that day an ash plume rose to an altitude of 4.3 km (14,000 ft) a.s.l. and drifted 75 km SW.
Geologic Background. Gunung Sinabung is a Pleistocene-to-Holocene stratovolcano with many lava flows on its flanks. The migration of summit vents along a N-S line gives the summit crater complex an elongated form. The youngest crater of this conical andesitic-to-dacitic edifice is at the southern end of the four overlapping summit craters. The youngest deposit is a SE-flank pyroclastic flow 14C dated by Hendrasto et al. (2012) at 740-880 CE. An unconfirmed eruption was noted in 1881, and solfataric activity was seen at the summit and upper flanks in 1912. No confirmed historical eruptions were recorded prior to explosive eruptions during August-September 2010 that produced ash plumes to 5 km above the summit.