The PVMBG said the state of Mount Semeru is still at Level II or `` Alert '', following the production of a pyroclastic flow of collapse (APG / Awan Panas Guguran) which has slipped by about 4 kilometers to the south-eastern and southern sectors of the summit and was accompanied by boulder avalanches, over a sliding distance of between 500 and 1000 meters from the Jonggring Seleko crater towards Besuk Kobokan this Saturday January 16, 2021 at 5:24 pm WIB .
Based on the seismic results, APG recordings were reported with a maximum amplitude of 22 millimeters and a duration of 4,287 seconds.
Semeru - the development of the pyroclastic flow and the co-pyroclastic plume of January 16, 2021 from 5:24 pm WIB - Doc. PVMBG - one click to enlarge
The number of occurrences of avalanche earthquakes, eruption earthquakes, emission earthquakes and harmonic earthquakes during this period still remains high, indicating that the movement of magma towards the surface is still occurring.
The PVMBG also recalls that the potential risk of the Mount Semeru eruption is in the form of glowing rock around the summit, while the ash-sized ejection material may be spread further depending on the direction and wind speed. Then, other potential dangers are pyroclastic avalanches and avalanches of rocks from the dome / tip of the lava tongue towards the southeast and south sectors of the summit.
In case of rain, lahars can occur along the course of the river which begins in the area of the lava tip.
In level II (alert) status, people / visitors / tourists are advised not to do activities within 1 km radius of the crater / summit of Mount Semeru and at a distance of 4 km from the direction of the opening of the crater in the south-southeast sector.
At Merapi, on Java, the dome continues to grow; it is incandescent at night, with rockslides.
The seismicity of January 16 breaks down into:
- Two earthquakes, accompanying pyoclastic flows of collapse, with an amplitude of 28 to 60 mm and an earthquake duration of 83.1 to 150.6 seconds.
- 113 collapse / avalanche earthquakes, with an amplitude of 3 to 23 mm and a duration of 13 to 122 seconds.
- 5 emission earthquakes, with an amplitude of 4 to 8 mm and the earthquake lasted 12 to 29 seconds.
- 38 hybrid / multiphase earthquakes with an amplitude of 3-25 mm, S-P 0.3-0.5 seconds and the duration of the earthquake was 4-13 seconds.
- 7 shallow volcanic earthquakes
- 1 distant tectonic earthquake.
The alert level remains at 3 / siaga, with a no-access zone that varies according to the orientations
Source: PVMBG & BPPTKG
Soufrière de St Vincent - 16.01.2021 - collection of lava samples from the dome by Dr. R. Robertson - UWI-RSC
Scientists safely and successfully collected rock samples from the new lava dome at St Vincent's Soufriere on January 16.
Analyzing the composition of these rocks will provide valuable information on whether the new dome is made of old material (linked to the 1979 eruption) or fresh material from greater depths. This will complement data from other monitoring techniques, which will allow scientists to better understand how the current eruption occurred, and will evolve.
There is no explosive eruption at the Soufriere volcano at this time. No evacuation order was issued either.
Soufriere continues to erupt "effusively" as hot magma reaches the surface at extreme temperatures. This appears overnight as a bright red glow above the crater, observed by the villagers of Chateaubelair and surrounding areas on the western flank of the volcano.
Sources: UWI-SRC, NEMO
At Klyuchevskoy, the explosive-effusive eruption continues.
A plume of gas, steam and a little ash was emitted and formed a cloud at 6,000-6,500 meters asl. stretching 65 km northeast of the volcano.
The thermal anomalies, marking the effusion, are very variable as the weather conditions.
The aviation code is orange, other ash explosions can occur at any time.
Sources: KVERT & VAAC Tokyo