Report on Sinabung (Indonesia) — 24 September-30 September 2014
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 24 September-30 September 2014
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2014. Report on Sinabung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 24 September-30 September 2014. Smithsonian Institution and US Geological Survey.
3.17°N, 98.392°E; summit elev. 2460 m
All times are local (unless otherwise noted)
According to news articles a pyroclastic flow at Sinabung traveled 2 km SE down the flanks at 1343 on 24 September. The height of a corresponding ash plume could not be determined because it rose into the cloud cover. About 4,700 people remained in evacuation shelters. On 30 September at 1720 an ash plume rose 2 km and a pyroclastic flow traveled 3.5 km.
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.