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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 : #Actualités volcaniques

Great photos posted yesterday by ESA astronaut Alexander Gerst illustrate the Anak Krakatau's activity of the last days, and his change since 21 September.

Anak Krakatau - activity of 24.09.2018 - photo ESA astronaut Alexander Gerst official Facebook page. Expedition 56/57 (Sumatre, to the left - Java, to the right)

Anak Krakatau - activity of 24.09.2018 - photo ESA astronaut Alexander Gerst official Facebook page. Expedition 56/57 (Sumatre, to the left - Java, to the right)

Anak Krakatau - activity of 24.09.2018 - photo ESA astronaut Alexander Gerst official Facebook page. Expedition 56/57
Anak Krakatau - activity of 24.09.2018 - photo ESA astronaut Alexander Gerst official Facebook page. Expedition 56/57

Anak Krakatau - activity of 24.09.2018 - photo ESA astronaut Alexander Gerst official Facebook page. Expedition 56/57

Anak Krakatau - seismicity revealing a change of behavior of the volcano from 21.09.2018 - Doc. Magma Indonesia 24.09.2018

Anak Krakatau - seismicity revealing a change of behavior of the volcano from 21.09.2018 - Doc. Magma Indonesia 24.09.2018

The Aura / IMO satellite has reported sulfur dioxide emissions on 23 September to the northwest and south of Sumatra.

The PVMBG reports for September 24, 69 earthquakes eruption and a continuous tremor of dominant amplitude at 45 mm.

The alert level remains at 2 / Waspada, with a 2 km forbidden zone.

Sources: PVMBG & Magma Indonesia
 

Krakatau - sulfur dioxide emissions over southern Sumatra - image Nasa / OMI 23,09,2018 / via Simon Carn

Krakatau - sulfur dioxide emissions over southern Sumatra - image Nasa / OMI 23,09,2018 / via Simon Carn

Etna has been active in recent days in three of its summit craters: the NSEC "Puttusiddu", the Bocca Nuova, and the northeast crater.

On September 20th, an overflight of the Bocca Nuova showed an incandescent mouth (photo Joseph Nasi / Butterfly helicopters)

On September 24, Boris Behncke reported small explosions in the northeast, with ejection of blocks, bombs and ashes, from one of the internal mouths; on September 23, another mouth showed Strombolian activity.

Sources: the observers cited

Etna Bocca nuova - incandescence and degassing on 20.09.2018 - photo J.Nasi / Butterfly Helicopters

Etna Bocca nuova - incandescence and degassing on 20.09.2018 - photo J.Nasi / Butterfly Helicopters

Etna 24.09.2018 / 9:45 - EMOT thermal webcam - in the absence of a scale, not easy to interpret at my level ... to note that Mirova reports a thermal anomaly between 6 and 12 MW on 24.09

Etna 24.09.2018 / 9:45 - EMOT thermal webcam - in the absence of a scale, not easy to interpret at my level ... to note that Mirova reports a thermal anomaly between 6 and 12 MW on 24.09

At the Piton de La Fournaise, the images of the webcam shows a modification to the active cone:

The OVPF, in its report of 24.09 / 16h indicated a cone still riddled towards the south, with a lava flow very channeled.

By comparing the images of the webcam during the night, with a beautiful lava flow, and that of the early afternoon, when the casting seems inactive, a clear change occurred.

More news is expected from volcanologists ... the tremor, after a slight increase on 23.09, has returned to a relatively stable level and surface flow rates are still between 1 and 3 m³ per second.

Source: OVPF

Piton de La Fournaise - 24.09.2018 / 14h06 UTC - Bert Piton webcam OVPF

Piton de La Fournaise - 24.09.2018 / 14h06 UTC - Bert Piton webcam OVPF

Piton de La Fournaise - 25.09.2018 / 09h32 - webcam IRT / OVPF

Piton de La Fournaise - 25.09.2018 / 09h32 - webcam IRT / OVPF

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