Fagradalsfjall - 05.06.2021 / 10h29 - overflow of the west dam towards the Nátthaga valley - webcam Veðurstofa Íslands / Meradalur - one click to enlarge
On the morning of June 5, the Meteorological Office team noticed an increase in turbulence and gas emissions during the eruption in Fagradalsfjall.
A lava overflow occurred at the western dam and a very rapid lava flow flowed into the Nátthaga valley. The lava advanced to the ephemeral pond, while widening; it is fed by a bifid flow at the level of the drop closing the valley to the north.
South of Geldingadalur, the flow has thickened and is heading south of the valley and could descend into Nátthaga, and block hiking trail A and access to the eruption.
Sources: RUV, mbls, local observers
Fagradalsfjall eruption - Nátthaga Valley, the flow reaches the ephemeral pond - 05.06.2021 / 10:09 pm - webcam RUV Langihryggur
The lava has pierced the western wall and is flowing at high speed into Syðri Meradalur (valley above Natthagi) and the lava is spreading over this valley in a large hot lake.
Nátthaga Valley - flow progress timelapse from 05.06.2021 - new mbls camera
In Sinabung, this June 6 from 11:35 pm WIT, an eruption generating a pyroclastic flow occurred. It could not be observed directly because of the fog, but Sadrah Peranginangin reports fallout of small pumice stones on the villages of Kuta Gugung and Kuta Rayat around midnight.
An Incandescent zone remained visible above the village of Sigarang-garang; the cause is not clearly identified, lava or pyroclastic flow, because of the fog blanket.
Several villages on the slopes of the Sinabung were hit by a hail of stones and gravel, the ash was confirmed to have reached Stabat.
Sinabung - plot on the seismogram of 06.06.2021 / 11:50 p.m. APG - and pumice samples - photos Sadrah Peranginangin / Beidar - one click to enlarge
The seismicity of June 6 from 6 to midnight local is characterized by;
- 1 eruption earthquake; with an amplitude of 36 mm and a duration of 85 seconds.
- 1 pyroclastic flow collapse earthquake, with an amplitude of 120 mm and a duration of 421 seconds.
- 9 avalanche earthquakes, with an amplitude of 6-37 mm and an earthquake duration of 31-163 seconds.
- 23 hybrid / multiphase earthquakes with an amplitude of 2-23 mm, S-P was not observed and the duration of the earthquake was 6-21 seconds.
- 1 distant tectonic earthquake with an amplitude of 72 mm lasting 57 seconds.
The activity level remained at 3 / siaga
The community and visitors / tourists should not conduct activities in the relocated villages, as well as the locations within a radial radius of 3 km from the summit of Mount Sinabung, as well as a sector radius of 5 km for the southeast sector, and 4 km for the east-north sector.
In the event of ash rain, people are advised to wear masks when leaving the house to reduce the health impact of volcanic ash. Secure drinking water facilities and clean roofs of houses from heavy volcanic ash so that they do not collapse.
People who live and live near rivers that originate at Mount Sinabung to stay alert to the dangers of lahars.
Sources: PVMBG, Magma Indonesia, Beidar Sinabung / Sadrah Peranginangin
In the Ryukyu archipelago, the eruption continues in Suwanosejima, with this June 7 at 2:38 pm, an explosion accompanied by a plume entering the clouds at an altitude of 1,500 meters; the plume is heading northeast.
Source: JMA webcams