Activity of Merapi, Ibu, Etna and Fagradalsfjall.

At Merapi on June 17, a white fumarole is observed at the main crater, with moderate to thick intensity, about 200 meters from the summit.

A hot cloud (PDC) was observed with a sliding distance of 2000 m towards the southwest.

Two lava avalanches were observed to the southwest with a maximum slide distance of 1000 m and to the southeast with a slide distance of 900 m. Six avalanches of incandescent lava were observed with a maximum sliding distance of 1,200 meters to the southwest.
Thanks to the seismographic recordings of June 17, 2021, it was recorded:
- 4 earthquakes related to pyroclastic flows of collapse
- 164 avalanche earthquakes
- 18 blast / emission earthquakes
- 21 hybrid / multiphase earthquakes
- 2 distant tectonic earthquakes

The activity level remains at 3 / Siaga.

The current potential danger is lava avalanches and hot clouds in the south-southwest sector covering the Boyong, Bedog, Krasak, Bebeng and Putih rivers for a maximum of 5 km. During this time, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

Sources: PVMBG, Magma Indonesia and BPPTKG

In the Moluccas, the Ibu volcano is on alert 2 / waspada; a white-gray plume surmounts the summit and the growing dome, from 200 to 800 meters on June 17, 2021.

Seismicity is characterized by:
- 63 eruption earthquakes, with an amplitude of 15-30 mm and an earthquake duration of 19-65 seconds.
- 53 avalanche earthquakes, with an amplitude of 3-24 mm and an earthquake duration of 25-60 seconds.
- 46 bursts of earthquakes with an amplitude of 5 to 14 mm and a duration of 10 to 35 seconds.
- 10 episodes of harmonic tremor
- 2 distant tectonic earthquakes

Communities around Mt Ibu and visitors / tourists should not move within a 2.0 km radius and the sector expansion is 3.5 km towards the crater opening in the northern part of the active crater of Mt. Ibu.
In case of ash rain, people active outside the home are advised to use nasal, mouth and eye protection.

Sources: PVMBG, Magma Indonesia

The INGV communicates that Strombolian activity continues at the south-eastern crater of Etna. This activity is accompanied by ash emissions which vary in intensity and frequency.

On June 17, 2021 from approximately 20:20 UTC, a sudden increase in Strombolian activity is observed at the level of the Southeast crater, which produces a continuous emission of ash which disperses in the summit area and an overflow that is propagates to the SW. The products of Strombolian activity go beyond the rim of the crater falling along the sides of the crater.

From approximately 23:20 UTC, the Strombolian activity of the southeast crater passed to the lava fountain stage. Based on the forecast model, the eruptive cloud produced by the current activity disperses in the SE direction.
The tendency to increase the mean amplitude of the volcanic tremor continues with very high values. The center of gravity of the volcanic tremor sources is located in the area of ​​the Southeast Crater, at an altitude of about 2900-3000 m above sea level.

The fountaining ceased at 00:10 UTC.
As for the lava overflow directed to the southwest, it continues to be fed.

Source: INGV OE

In Reykjanes Peninsula, the eruption of Fagradalsfjall continues.

The flows in the valley of Nátthaga continue to slowly advance and especially to thicken.

Access to the active cone is only via path B, which is steeper; it allows a good vision on the crack and the alignment of the eruptive cones.

Sources: Sentinel-2, Jarðsöguvinir - Friends of Historical Geology and Pierre Gondolff.