As reported in the update of yesterday's article, the Sinabung was the site of a strong eruption on December 27 at 15:36 WIB.
The height of the eruptive column could not be observed due to atmospheric conditions (see video); Following the eruption, two pyroclastic flows were reported by the Sinabung observation post, one traveling over 3,500 meters to the ESE, the other over 4,500 meters to the SSE. They did not cause any casualties, remaining confined within the forbidden zone.
The ash falls have affected thousands of people, without causing panic. They have fallen on a large eastern sector, including Sukanalu, Tonggal Town, Kuta Central, Gamber, Berastepu, Jeraya, Iron Door.
The aviation alert level is orange, and the PVMBG reminds the prohibited areas, and the instructions to follow in case of ash falls. Vigilance is important for people close to rivers, particularly the River Laborus, on which a barrage of ashes can give way at any moment.
Sources: PVMBG, BNPB, Magma Indonesia
The latest bulletin of the Colombian Geological Survey concerning Nevado del Ruiz mentions a seismicity related to the fracturing of rocks in slight increase compared to the previous week. The earthquakes are mainly located in the north, south-west, north-east and Arenas crater, at depths between 900 and 6.7 km. The strongest earthquake was on December 25 at 14:58 local time. ML 1.6, located NE of Arenas crater at a depth of 3.1 km.
Several thermal anomalies have been reported by the Mirova and Nasa Firms sites around the Arenas crater.
The plumes of gas and steam are noted at a maximum height of 1,200 meters above the volcano, with a dispersion towards a southwestern sector.
The level of activity of Nevado del Ruiz remains in Amarillo.
Source: Servicio Geologico Colombiano - link
The Pacaya presented Strombolian explosions during the 24-26 December period, accompanied by ejections of pyroclastic materials 50 meters above the main cone, and a lava flow on the west flank a hundred meters long.
Sources: GVP & Insivumeh