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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity
  Fagradalsfjall - night activity 25.07.2021 - mbls webcam

 Fagradalsfjall - night activity 25.07.2021 - mbls webcam

Fagradalsfjall - 25.07.2021, respectively at 7.40 p.m. and 10.00 p.m. - webcam_langihryggur NV
Fagradalsfjall - 25.07.2021, respectively at 7.40 p.m. and 10.00 p.m. - webcam_langihryggur NV

Fagradalsfjall - 25.07.2021, respectively at 7.40 p.m. and 10.00 p.m. - webcam_langihryggur NV

In Fagradalsfjall, the eruption remains active, with a strong spattering between 5 p.m. on July 25 and 2 a.m. on July 26, before the fog obscures the site.

The oscillations of the tremor seem more regular for a few days.

 

Sources: Jarðvísindastofnun Háskólans, Hraun.vedur webcams mbls, RUV and Visir

Fagradalsfjall - tremor at 26.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 26.07.2021 - Doc. Hraun.vedur.is

Persistent nighttime glow observations on Whakaari / White Island web cameras indicate continued high temperature gas emission. Observation of the night glow on web cameras continued from June 30 until today. Last week's thermal infrared (IR) observation and measurement flight reported the emission of very hot gas (498-654°C) from some of the 2019 lava extrusion vents.
The continued drop in the carbon dioxide / sulfur dioxide ratio indicates continued degassing of fresh magma.

 

The volcanic alert level has been raised to 2 and the aviation color code to yellow.
While Volcanic Alert Level 2 is primarily associated with the risks of volcanic unrest (including releases of hot volcanic steam and gases, earthquakes, landslides, and hydrothermal activity), there are also Risk of rash and rashes can always occur with little or no warning.

 

Source: GeoNet / Volcanic alert bulletin 26,07,2021

Whakaari / White island - volcanic alert level 2 code aviation yellow - Photo GeoNet 26.07.2021

Whakaari / White island - volcanic alert level 2 code aviation yellow - Photo GeoNet 26.07.2021

At Merapi, on Java, the main crater plume is observed white in color with high intensity about 100 meters from the summit.

At the seismicity level, the PVMBG reports:

- 156 Avalanche earthquakes with an amplitude of 3 to 31 mm and a duration of 12.9 to 161.2 seconds.
- 17 blast / emission earthquakes with an amplitude of 3 to 10 mm and the duration of the earthquake from 9.5 to 31.7 seconds.
- 185 hybrid / multiphase earthquakes with an amplitude of 3-22 mm, S-P 0.2-0.9 seconds and an earthquake duration of 5.5 to 11.5 seconds.
- 69 shallow volcanic earthquakes with an amplitude of 22 to 78 mm and a duration of 6.4 to 35.1 seconds.
- 2 distant tectonic earthquakes.

 

Sources: PVMBG, Magma Indonesia and BPPTKG

Merapi - 07.25.2021 / 11:34 pm - webcam Magma Indonesia

Merapi - 07.25.2021 / 11:34 pm - webcam Magma Indonesia

Merapi from Kemalang - 07.26.2021 / 06:11 - photo Sukiman Lintas Merapi

Merapi from Kemalang - 07.26.2021 / 06:11 - photo Sukiman Lintas Merapi

Merapi - seismicity at 25.07.2021 - Doc. BPPTKG

Merapi - seismicity at 25.07.2021 - Doc. BPPTKG

" The Volcanological Observatory of Goma (OVG) informs the entire population of Goma and its surroundings that this Saturday, July 24, 2021 afternoon, a fall of dust / volcanic ash over a large part of the surrounding area is observed from the Nyiragongo volcano.

These ashes come from the collapse of part of the crust of the central crater of the Nyiragongo volcano. This event has no relation to a certain eruptive activity of the volcano which could worry the public.

The OVG then asks everyone to observe the rules of hygiene by carefully covering food and dishes as well as to reserve the use of rainwater as drinking water. "

 

Source: The Director General of the OVG, Prof Dr MUHINDO SYAVULISEMBO Adalbert

Nyiragongo - the crater seen at night on 06.12.2021 - Photo by Arsène T. Sadiki via Ch.Balagizi

Nyiragongo - the crater seen at night on 06.12.2021 - Photo by Arsène T. Sadiki via Ch.Balagizi

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