At the Nyiragongo, the vent opened in March 2016 on the upper terrace surrounding the lava lake found a nice activity in early December, with fountaining and intracratory flows (photos and video following this link / Georgios Grigoriadis / Shérine France )
As reported by the volcanologist Ludovic Leduc, the major risk is the pressure made by all this lava on the flanks of the volcano, which could crack and let escape lava flows as in 2002.
In Chile, Nevados de Chillan reported an explosion on December 5 at 11:32 local time (UTC -3h), associated with an LP seismic signal, and a plume of ash and gas at a height of about 1,600 meters.
On the other hand, among the earthquakes of the day, we point the most energetic at4.5 km to the ESE of the active crater and a depth of 3,400 meters.
Inflation continues to be recorded, as well as thermal anomalies: 7MW on 05.12 and 19 Mw on 06.12 / 4.05.
Nicanor Crater has four emission centers, acting independently or simultaneously. Their activity is associated with pyroclastic flows, 1,100 meters long towards East and 400 meters towards South.
Lava flows, from L1 to L4, observed previously, show no further progress.
The technical alert is maintained in Naranja
Source: Sernageomin OVDAS
In the Aleutian arc, the thermal anomalies recorded on December 5 at Shishaldin are consistent with an ongoing lava effusion. The continuous tremor is also rising.
Small emissions of steam and a little ash are observable by the webcam on the summit and the north flank.
The volcanic alert remains at Watch and the aviation code is orange.