The KVERT passed the aviation code from yellow to orange at Bezymianny, on December 18, following an increase in activity.
Avalanches have been observed on the southeast flank of the lava dome for several hours following a likely extrusion.
Possible ash explosions can occur at any time, up to 10 to 15 km in height, and affect international and local air traffic.
For several days, the Fuego maintains an activity characterized by white fumaroles, and explosions, between 4 and 8 per hour, generating plumes of gray ash reaching up to 5,000 meters asl and dispersing over 15-20 km to the west and southwest.
Fine ashes are observed e.a. on Panimaché I y II, Morelia, Santa Sofía, and el Porvenir.
Incandescent impulses 200-250 meters above the crater cause avalanches in the vicinity of the crater.
Source: Insivumeh & VAAC Washington
Agung crater before the eruption - zenith view from 20.10.2017, via drone ATS Ai300 vs.. Google image (to view the relief) Agung crater - zenith view from 20.10.2017, via drone ATS Ai300 vs.. Google image (to view the relief) - a click to enlarge
Agung - zenith view from 16.12.2017, via drone ATS Ai300 - courtesy of id magma, of the KementerianESDM, GeologiBadan vulkanologi mbg
Comparative photos of the Agung Crater show its evolution between October 20 (before the eruption) and December 16 (eruption in progress).
Lava occupies about 1/3 of the volume of the crater, and the seismicity remains in the norms of the previous days without much difference; on December 17, 44 emission earthquakes were recorded, and 6 low frequency earthquakes.
Emissions of gas and ash are maintained between 1,000 and 2,000 meters above the summit.
Sources: PVMBG, Magma Indonesia, BNPB