From 17:39 UTC on June 25, the resumption of Strombolian activity at the south-eastern crater of Etna is observed from surveillance cameras, increasing around 18:05 UTC, and emerging, according to a pattern now known, around 18:25 UTCon an overflow of lava, which from the southern slope of the southeast crater, spreads in a southwest direction.
From around 6:40 p.m. UTC, the transition of Strombolian activity from the Southeast Crater to a lava fountain can be observed from surveillance cameras. The height of the eruptive column reached about 7.6 km above sea level, dispersing to the east. As of 7:15 p.m. UTC, the lava fountain in the southeast crater has gradually depleted.
The lava fountain produced an overflow of lava along the southern slope of the southeast crater, which spread in a southwest direction. On the east side, a third small lava flow is still observed, generated from the effusive vent at an altitude of 3050 m., During the last episode of the fountain.
Source: INGV OE
At Fagradalsfjall, the Nátthaga Valley appears to be filled with lava from the ongoing eruption ... and is starting to come out. No more obstacles now between the main road and the flow.
Based on the current eruption activity, the lava flow will, in all likelihood, reach Suðurstrandarvegur via Nátthaga in the coming weeks.
The Natthaga Valley is full! 25.06.20210 - Lava starts to come out towards the main road - video Rafn Sigurbjörnsson
A map of soil deformation due to lava effusion in the Reykjanes Peninsula has been uploaded by the University of Iceland. The data taken into account for the period from March 25 to June 23, 2021 are corrected for the deformation of the plate boundary and the seasonal effects.
Sources: Almannavarnir, Rafn Sif photos, webcams and Univ. Iceland
More details on the Merapi éruption : between June 18 and 24, 2021, the BPPTKG recorded:
Pyroclastic avalanche flows occurred 17 times with a maximum slide distance of 2,500 m in the southwest and 5 times with a slide distance of 1,400 m in the southeast.
Lava boulder avalanches have been observed 206 times with a maximum slide distance of 2,000 meters to the southwest and 600 m to the southeast.
The volume of the lava dome in the southwest sector is 1,590,000 m³ with a growth rate of 11,400 m³ / day.
Morphological analysis of the peak area based on photos of the southeast sector from June 24 to June 17, 2021 shows an increase in the height of the central dome of 0.5 m. The deformation of Mount Merapi, which was monitored by EDM this week, showed a distance shortening rate of 2 cm / day.
The current potential danger consists of lava avalanches and hot clouds in the southeast-southwest sector for a maximum of 3 km to the Woro River and 5 km to the Gendol, Kuning, Boyong rivers, Bedog, Krasak, Bebeng and Putih.
Merapi - map of areas at risk of avalanches and pyroclastic flows - Doc. BPPTKG - Orange spots : hamlets - gray : areas of possible pyroclastic flows.