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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
Pavlof - image Sat. Worldview-3 bands 8,5,3 of 28.02.2022 - Doc. matt Loewen / AVO - one click to enlarge

Pavlof - image Sat. Worldview-3 bands 8,5,3 of 28.02.2022 - Doc. matt Loewen / AVO - one click to enlarge

Pavlof Volcano continues to erupt from the active vent just below the summit on its southeastern flank. Several explosions were detected daily. These explosions had higher seismic and infrasound amplitudes than previous weeks, marking an increase in explosive activity this week. An almost continuous seismic tremor was also recorded throughout the week. Cloudy conditions generally obscured views of the volcano, although low-level ash and steam emissions were observed intermittently in clear web camera views. Elevated surface temperatures have been observed in satellite data over several days over the past week.

Periods of lava spattering and fountaining from the vent on the volcano's upper eastern flank have been occurring since mid-November 2021. This activity has built a small cone and sent lava flows down the flank that are melting snow and ice and produce varying amounts of meltwater. . Meltwater usually incorporates loose debris on the volcano's flank and forms thin lahars (less than 2 m thick). The lahar deposits extend down the east-southeast flank for several kilometres, not quite to the base of the volcano.

Previous eruptions at Pavlof indicate that the level of unrest may change rapidly and progression to greater eruptive activity may occur with little or no warning.

The Volcanic Alert Level is: Watch and the Aviation Code: Orange.

 

Source: AVO

Sheveluch - photo Yu. Demyanchuk, IVS FEB RAS, KVERT - one click to enlarge

Sheveluch - photo Yu. Demyanchuk, IVS FEB RAS, KVERT - one click to enlarge

Sheveluch - Volcanic ash advisory at 29.10.2022 / 0600Z - Doc. VAAC Tokyo

Sheveluch - Volcanic ash advisory at 29.10.2022 / 0600Z - Doc. VAAC Tokyo

A strong wind lifts the ashes from the southern slopes of the Sheveluch volcano, a plume of resuspended ash extends to 3,000 m. asl. 80 km southeast of the volcano.

The growth of the lava dome continues, strong fumarolic activity and incandescence of the lava dome, explosions and hot avalanches accompany this process.
The extrusive eruption of the volcano continues. Ash explosions up to 10-15 km. a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

The aviation code remains at Orange.

 

Sources: KVERT & VAAC Tokyo

Merapi - activity from 21 to 27.10.2022 - photo BPPTKG - one click to enlarge

Merapi - activity from 21 to 27.10.2022 - photo BPPTKG - one click to enlarge

At Merapi, between October 21 and 27, 2022, 14 lava avalanches were observed in the southwest, dominant up to the Bebeng River with a maximum slip distance of 1,500 m. The sound of the avalanches was heard from Babadan post 7 times with moderate intensity.

No significant morphological changes were observed from the southwest dome and the central dome. The volume of the dome is fixed, namely for the southwest lava dome of 1,626,000 m³ and the central dome of 2,772,000 m³.

During this week, the seismicity of Mount Merapi recorded 247 deep volcanic earthquakes (VTA), 70 multiphase earthquakes (MP), 303 abortion earthquakes (RF), 25 blowing earthquakes (DG ) and 1 tectonic earthquake (TT).

Seismicity is still quite high. Mount Merapi's deformation that was monitored using EDM this week showed no significant changes.

 

The activity level remains unchanged at 3 / Siaga

The current potential danger is in the form of lava avalanches and hot clouds in the south-southwest sector covering the Boyong River for a maximum of 5 km, Bedog River, Krasak, Bebeng for a maximum of 7 km . The southeastern sector covers the Woro River for a maximum of 3 km and the Gendol River for 5 km.

 

Source: BPPTKG

Piton de La Fournaise - Baptism of the Piton Tikal - Doc. annotated OVPF-IPGP on a photo from 06.10.2022 - click to enlarge

Piton de La Fournaise - Baptism of the Piton Tikal - Doc. annotated OVPF-IPGP on a photo from 06.10.2022 - click to enlarge

The Cité du Volcan, the Volcanological Observatory of Piton de la Fournaise and the National Park of La Réunion, are pleased to announce the baptismal name of the new volcanic cone, resulting from the eruption from September 19 to October 5, 2022: the TIKAL peak.

Why the choice of this name?

This name refers to the tales and legends of Reunion associated with "Gran Mèr Kal". In these different "zistwar" reference is sometimes made to his son, under the name of "Ti Kala" or Tikal.

This new volcanic cone having been built near the Piton Kala Pélé, with a relatively identical shape, it is quite naturally that this name appeared.

In the midst of "somèn kréol" and on the eve of "Fèt Gran Mèr Kal", the choice of this name seems all the more relevant.

 

Sources: OVPF & Cité du Volcan

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