Report on Sinabung (Indonesia) — 7 January-13 January 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 7 January-13 January 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, 7 January-13 January 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 satellite images, weather models, and ground observations, the Darwin VAAC reported an eruption from Sinabung on 10 January with an ash plume that rose to an altitude of 4 km (13,000 ft) a.s.l. Ashfall was reported in nearby areas at night on 11 January. During 12-13 January ash plumes rose to an altitude of 4.6 km (15,000 ft) a.s.l. and drifted E.
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.