Activity of Tinakula, Stromboli, Sabancaya and Agung.

The eruption of Tinakula remains poorly documented.

On a Landsat 8 satellite image dated 21.10.2017, we can see the thermal signature of a lava flow towards the avalanche caldera breaching the western slope of the volcano.

Two images, provided by Planetlabs on 9 September and 22 October respectively, show that volcanic ash covers the island and that a new pyroclastic delta has formed on the north-west coast.

Sources: Landsat 8; Planetlabs; Simon Carn; Gamara Okzman Bencarson

A strong explosion rocked Stromboli on October 23, 2017 at 16:40 local, accompanied by the emission of bombs that fell on a large area around the craters, including the point of view of Pizzo. Fortunately no one was present there at the time of the explosion, which occurred without significant warning signs ... Stromboli can be dangerous, even in times of relatively low activity.

Sources: Volcanodiscovery; Laboratorio Geofisica Sperimentale; INGV Catania

During the week of October 16 to 22, 2017, explosive activity increased in Sabancaya, with an average of 47 episodes per day.

Seismicity remains dominated by LP earthquakes, in relation to fluid movements; the tremor, linked to ash emissions, is also increasing.

The eruptive plumes have reached a max. of 3,800 meters above the crater, with a scattering of ashes to a large eastern area about 60 km.

The sulfur dioxide flux peaks at 2,196 tonnes / day on October 16th.

Four thermal anomalies, between 2 and 31 MW, were recorded by Mirova.

Source: IGPeru / OVI / Ingemmet

At the Agung, visibility has allow to see steam and gas plumes between 200 and 500 meters above the summit.

The seismicity has decreased, while remaining important:

- on October 22nd, the PVMBG reports 122 VA deep volcanic earthquakes, 62 VB superficial volcanic earthquakes, and 9 local tectonic earthquakes.

- On October 23, there were 4 episodes of non-harmonic tremor, 154 VA earthquakes, 53 VB earthquakes and 11 local tectonic earthquakes.

Sources: PVMBG; Magma Indonesia.