After more than a month of dome growth and lava flows, PVMBG reported that Sinabung erupted explosively again on 29 June. The eruption plume rose to 4 km (13,000 ft) a.s.l. and pyroclastic flows extended 4.5 km SE. Visual observations were impeded by inclement weather. About 14,000 persons remain evacuated since September 2013. The Alert Level remains at 3 (on a scale of 1-4).

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), People's Daily Online (China)