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Report on Sinabung (Indonesia) — 2 June-8 June 2021


Sinabung

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
2 June-8 June 2021
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2021. Report on Sinabung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 2 June-8 June 2021. Smithsonian Institution and US Geological Survey.

Weekly Report (2 June-8 June 2021)

Sinabung

Indonesia

3.17°N, 98.392°E; summit elev. 2460 m

All times are local (unless otherwise noted)


PVMBG reported that the eruption at Sinabung continued during 2-8 June. An eruptive event was recorded at 2004 on 3 June but not visually confirmed due to inclement weather. Another event, at 2335 on 6 June, produced ash plumes and pyroclastic flows, though weather again inhibited visual observations. The Darwin VAAC reported that an ash plume rose to 9.1 km (30,000 ft) a.s.l. and drifted W and SW. Ash continued to be identified in satellite images; the next day ash clouds drifted W and WSW at 9.1 km, W at 7.3 km (24,000 ft) a.s.l., WNW at 6.1 km (20,000 ft) a.s.l., and N at 4.3 km (14,000 ft) a.s.l. The Alert Level remained at 3 (on a scale of 1-4), with a general exclusion zone of 3 km and extensions to 5 km in the SE sector and 4 km in the NE sector.

Geological Summary. 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.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)