On October 11, during the last hours, a slight increase in the explosive activity of the Fuego is reported by the Insivumeh: 10 to 14 hourly explosions, weak to moderate, accompanied by plumes of ash rising to 4,600 meters asl. traveling 15 km to the west and southwest.
Incandescent impulses are observed 100-200 meters above the crater, generating the fall of volcanic materials and avalanches towards the Santa Teresa and Las Lajas barrancas.
This activity is accompanied by moderate fallout, shock waves and constant outgassing noise.
Source: Insivumeh report 11.10.2018 / 22h local
From 3.50 am on October 12, a new phase of the eruption began, effusive: fountains of 400 meters above the crater generated a lava flow that reaches 600 meters long towards the west drainages of the volcano.
A possibility of pyroclastic flows is considered towards the seca, Las Lajas and Cenizas barrancas.
As a preventive measure, the Conred has restricted access to the national road 14 to the surveillance units, and asks the population to be attentive to possible evacuations.
Sources: Insivumeh & Conred 12.10.2018 / 4h local.
On the evening of October 12, pyroclastic flows are reported in the Barranca Seca, where the lava flow reaches a length of 1,500 meters. Its advance causes a lifting of materials and some avalanches.
A pyroclastic flow is also observed in the Barranca Santa Teresa.
The eruptive dynamics is maintained with moderate explosions, which are accompanied by ash plumes at 5,000 meters asl, dispersing to the SW, O and SE over 15-20 km. ; incandescent impulses are observed 200-300 meters above the crater. The fallout of ashes concerns Panimache I, Morelia, Sangre de Cristo, El Porvenir, and Finca Palo Verde.
Source: Insivumeh local report 13.10.2018 / 00h
Fuego - Pyroclastic flows in Seca Barranca (left) and Santa Teresa barranca (right) 12.10.2018 - according to Conred videos - one click to enlarge
At Pacaya, an increase in seismic activity is observed in relation to the tremor produced by the lava flow and an increase in degassing.
The lava flow is measured 600-700 m long towards Cerro Chino on the northwest flank. Explosions expel material 25 to 50 meters above the crater, which produces avalanches and fine particles in the area from which the flows originate. The intracraterical cone has reached a height of more than 75 meters.
Source: Insivumeh & Conred