Activity of Turrialba, Agung, Nyiragongo and Niamuragira.

Between 05:20 and 08:40 local, on October 20, 2017, the Turrialba presented sporadic passive emissions of ash; ash plumes are reported between 300 and 500 meters maximum above the crater, before dispersing to the northwest.

Sources: Ovsicori & RSN

At Agung, no change of status.
The white plume of steam oscillates between 50 and 100 meters above the summit.
At the seismicity level, there is a general decline, with
- October 19, 4 episodes of harmonic tremor, 608 deep volcanic earthquakes VA, 245 superficial volcanic earthquakes VB, and 113 local tectonic earthquakes.
- October 20, 5 episodes of non-harmonic tremor, 253 deep volcanic earthquakes VA, 126 volcanic superficial earthquakes VB, and 20 local earthquakes.

Sources: PVMBG & Magma Indonesia

The Zairean press reported a statement from the OVGoma that Nyiragongo and Niamuragira volcanoes experienced intense activity in their respective craters on 17 and 18 October. This activity has been trending down until Friday morning.

In Nyiragongo, the activity remains confined in the crater, without fumaroles or other traces on the flanks.
Two photos published on Instagram shows that the activity of the cone stuck to the wall of the crater has resumed, with a flow to the pit crater and the lava lake; this activity is confirmed by Charles Balagizi / OVG.

Source: Africa time