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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
Piton de La Fournaise - view of the eruptive site on September 22 at 11am (local time). (© OVPF / IPGP)

Piton de La Fournaise - view of the eruptive site on September 22 at 11am (local time). (© OVPF / IPGP)

The eruption began September 15 at 4:25 local time at Piton de La Fournaise continues. The volcanic tremor (indicator of eruptive intensity on the surface) has undergone many fluctuations in the last 24 hours, certainly related to fluctuations in the geometry of the volcanic cone being formed (successions of obstructions and partial dismantling)

A deep volcano-tectonic earthquake (about 2.6 km below sea level) was recorded under the east flank of the volcano during the day of 21 September. No volcano-tectonic earthquakes have been recorded during the current day.

No significant deformation are noticeable since the onset of the eruption.

Surface flows estimated from satellite data, via the HOTVOLC platform (OPGC - Clermont Auvergne University) are between 1 m3 / s and 3 m3 / s over the last 24 hours.

Piton de La Fournaise - view of the eruptive site on September 22 at 11am (local time). (© OVPF / IPGP)

Piton de La Fournaise - view of the eruptive site on September 22 at 11am (local time). (© OVPF / IPGP)

Piton de La Fournaise - 22.09.2018 / 16h22 - the winds responsible for the emission of Pelé's hair blow towards the west - webcam fullHD IRT and IPGP-OVPF

Piton de La Fournaise - 22.09.2018 / 16h22 - the winds responsible for the emission of Pelé's hair blow towards the west - webcam fullHD IRT and IPGP-OVPF

Fallout of Pele's hair was reported in the Grand Coude area this morning, more than 8 km from the volcano. Given the current wind above 2000 m altitude, we can assume that the exposed areas are the upper St. Joseph (Jean Petit, Grand Coude, Plain of the Grebe ...), Petite-Ile (Piton Bloc, Manapany the highs) and potentially even Montvert the highs.

Pele's hair is formed from very fluid lava ejecta (at the level of the eruptive vent) which stretch into fine filaments under the action of the wind, which can disperse over long distances under the action of the wind. Such eruptions producing Pele's hair are feared by the Reunionese breeders, because the wind can transport them far enough, on pastures. And the cattle, while grazing, also swallow this hair of Pele, causing irritations, ulcerations even stomach and intestinal perforations.

Piton de La Fournaise - Hair of Pelé on the  young plants of tea at Grand Elbow, this 22.09.2018 - photo Piton de La Fournaise / Facebook

Piton de La Fournaise - Hair of Pelé on the  young plants of tea at Grand Elbow, this 22.09.2018 - photo Piton de La Fournaise / Facebook

During the flyover at 11am this morning, the cone continued its construction and the hanging wall East, observed yesterday was gradually covered with slag fallout.

The cone, always south-facing, lets out a main flow in a deep channel (photos above). Lava tubes have been observed during formation in the most upstream part of this main channel.

Three regimes of lava fountains were still visible inside the cone.

Source: OVPF & Piton of La Fournaise 974 / Facebook

Anak Krakatau - activity from 22.09.2018 - one click to enlarge - image Sentinel-2 image bands 12,11,4

Anak Krakatau - activity from 22.09.2018 - one click to enlarge - image Sentinel-2 image bands 12,11,4

The eruptive activity of Krakatau changed from 21 September: 253 eruptions of eruptions were recorded, as well as a continuous tremor of dominant amplitude at 40 mm.

Magma Indonesia has released an Orange VONA on 21.09 / 3.27 WIB.

On September 22, 56 eruptions were observed, accompanied by black ash plume rising to 200-300 m. above the crater. Between eruptions, a tick white plume with more or less gray is emitted, rising up to 1,000 m. above the summit. Nighttime glow is reported.

The PVMBG recommends not to approach the crater within a radius of 2 km.

Sources: PVMBG & Magma Indonesia

Anak Krakatau - Thermal anomalies of 22.09.2018 - Doc Mirova Modis 2018.09.22 / 15h

Anak Krakatau - Thermal anomalies of 22.09.2018 - Doc Mirova Modis 2018.09.22 / 15h

Anak Krakatau - 22.09.2018 / 11h10 - photo Webcam PVMBG (reworked to reveal the eruptive plume)

Anak Krakatau - 22.09.2018 / 11h10 - photo Webcam PVMBG (reworked to reveal the eruptive plume)

Krakatau - Volcanic Ash Adivisory 22.09.2018 / 11.30 - Doc. VAAC Darwin IDD65295

Krakatau - Volcanic Ash Adivisory 22.09.2018 / 11.30 - Doc. VAAC Darwin IDD65295

Anak Krakatau - resumption of eruption earthquakes (right part of the seismicity diagram - Doc.Magma Indonesia

Anak Krakatau - resumption of eruption earthquakes (right part of the seismicity diagram - Doc.Magma Indonesia

At Kilauea, the cone and the flow of fissure 8 no longer show any trace of active lava, no visible glow,  while nearby vents continue to degas regularly.
The vegetation begins to be seen in the Leilani area, except in areas close to the cracks.
No signs of reactivation are observed ... seismicity and sulfur dioxide emissions are reduced in the eastern rift zone.
 
Sources: AVO & Mick Kalber / Bruce Omori

Kilauea East Rift Zone - The cone and the flow of fissure 8 on 20.09.2018 - The inner walls of the cone and channel, mostly overhanging and unstable, have collapsed. - Bruce Omori Photos
Kilauea East Rift Zone - The cone and the flow of fissure 8 on 20.09.2018 - The inner walls of the cone and channel, mostly overhanging and unstable, have collapsed. - Bruce Omori Photos

Kilauea East Rift Zone - The cone and the flow of fissure 8 on 20.09.2018 - The inner walls of the cone and channel, mostly overhanging and unstable, have collapsed. - Bruce Omori Photos

Kilauea East Rift Zone - A "kipuka", leaving intact a portion of Pohoiki road, gently reverberating - photo Bruce Omori 20.09.2018

Kilauea East Rift Zone - A "kipuka", leaving intact a portion of Pohoiki road, gently reverberating - photo Bruce Omori 20.09.2018

Vidéo Mick Kalber - September 20, 2018 No News is Good News In spite of cloudy conditions this morning, we were able to access the entire flow field of Kilauea Volcano's lower east rift zone eruption.

At Popocatépetl, the last 24 hours were marked by 40 exhalations, three explosions on 22nd September, at 14h11, 15h18 and 20h23 respectively; the first explosion was accompanied by a plume of 2,800 meters above the crater.

Popocatépetl - explosion of 22.09.2018 / 14h17 - Cenapred Webcam

Popocatépetl - explosion of 22.09.2018 / 14h17 - Cenapred Webcam

In the early evening, explosions occurred at 20:56, 21:47 and 22:07, interspersed with emissions of steam and gas, and incandescence.
This activity is related to the destruction of the dome observed during the flight on September 21st, and remains in the context of the Amarillo Fase 2 warning.
 
Sources: Cenapred and Webcams from Mexico.

Popocatépetl - explosions of 22.09.2018, respectively at 21h47 and 22h07 - WebcamsdeMexico / Cenapred
Popocatépetl - explosions of 22.09.2018, respectively at 21h47 and 22h07 - WebcamsdeMexico / Cenapred

Popocatépetl - explosions of 22.09.2018, respectively at 21h47 and 22h07 - WebcamsdeMexico / Cenapred

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