Report on Sinabung (Indonesia) — 17 January-23 January 2018
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 17 January-23 January 2018
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2018. Report on Sinabung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 17 January-23 January 2018. Smithsonian Institution and US Geological Survey.
3.17°N, 98.392°E; summit elev. 2460 m
All times are local (unless otherwise noted)
PVMBG and BNPB reported that ash plumes at Sinabung were seen rising as high as 3.5 km above the crater during 18-23 January and drifting E, SE, and W, although sometimes foggy conditions prevented visual observations. Avalanches of incandescent material traveled as far as 1.5 km down the ESE flank during 21-23 January. The Alert Level remained at 4 (on a scale of 1-4), with a general exclusion zone 3 km and extensions of 7 km on the SSE sector, and 6 km in the ESE sector, and 4 km in the NNE sector.
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.