The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported increased seismicity at Bur ni Telong. The seismic network detected an increase in the number of deep volcanic events, with 87 events recorded during 1-3 December. Additionally, the network recorded 19 local tectonic earthquakes. During 0000-1317 on 4 December there were 39 shallow volcanic earthquakes, one deep volcanic earthquake, and two local tectonic earthquakes. No emissions were observed. The Alert Level remained at 2 (the second lowest level on a scale of 1-4), though at 1500 on 4 December the exclusion zone was increased to a radius of 3 km from the crater area. The public was reminded to avoid the fumarole and solfatara regions, especially during cloudy or rainy weather.

Geological Summary. The conical Bur ni Telong volcano was constructed at the southern base of the massive Bur ni Geureudong volcanic complex, one of the largest in northern Sumatra. The historically active volcano lies 4.5 km from the summit of Geureudong,and its summit crater has migrated to the ESE, leaving arcuate crater rims. Lava flows are exposed on the southern flank. Explosive eruptions were recorded during the 19th and 20th centuries.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)