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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
Chikurachki - image Sentinel Hub nat. colors from 01.07.2022 / Copernicus - one click to enlarge

Chikurachki - image Sentinel Hub nat. colors from 01.07.2022 / Copernicus - one click to enlarge

The explosive activity of the Chikurachki volcano was renewed, exactly one week after the cessation of the previous one.
The new phase of the explosive eruption of the Chikurachki volcano began around 00:30 UTC on June 30, 2022. The explosions sent ash up to 4.5 km a.s.l., the ash plume continues to move south- west of the volcano.

Three eruptions have taken place from the volcano in the past two days (June 30 and July 1) to produce ash columns up to 3 km and 4.6 km a.s.l. spanning about 300 and 50 km to the west and south-southeast of the volcano.
A thermal anomaly was detected yesterday.

Eruptive activity of the volcano continues. Ash explosions up to 6 km above sea level could occur at any time. Ongoing activity could affect low-flying aircraft. The aviation code is orange.

 

Source: KVERT & VAAC Tokyo.

Kavachi - Sentinel-2 image from 06.29.2022 / Copernicus - one click to enlarge

Kavachi - Sentinel-2 image from 06.29.2022 / Copernicus - one click to enlarge

Satellite data showed discolored water around Kavachi on June 29, 2022.
Kavachi is one of the most active submarine volcanoes in the Southwest Pacific, located in the Solomon Islands south of Vangunu Island. Sometimes called Rejo te Kvachi ("Kavachi Furnace"), this shallow basaltic to andesitic submarine volcano has repeatedly produced ephemeral islands up to 1 km long since its first recorded eruption in 1939.

The current eruptive phase began on October 2, 2021, and is still ongoing at the end of June.

 

Sources: Global Volcanism Program and Senrinel-2

Ili Lewotolok - 01.07.2022 / 21:39 WITA - PVMBG Magma Indonesia webcam - one click to enlarge

Ili Lewotolok - 01.07.2022 / 21:39 WITA - PVMBG Magma Indonesia webcam - one click to enlarge

The day of July 1, 2022 at Ili Lewotolok showed continuous activity, marked by a white, gray or black plume, of varying intensity, 50-1,300 meters from the summit.

Seismicity was characterized by:
- 35 eruption earthquakes, with an amplitude of 5.9 to 37.8 mm and an earthquake duration of 25.8 to 123 seconds.
- 6 avalanche earthquakes, with an amplitude of 1.3 to 21.6 mm and an earthquake duration of 69 to 178 seconds.
- 96 emission earthquakes, with an amplitude of 1.9 to 29.8 mm and an earthquake duration of 19 to 112 seconds.
- 7 harmonic episodes, with an amplitude of 2.3 to 35.1 mm and an earthquake duration of 39 to 249 seconds.
- 31 episodes of non-harmonic tremor, with an amplitude of 1.9 to 37.2 mm and an earthquake duration of 80 to 526 seconds.
- 1 hybrid / multiphase earthquake with an amplitude of 2.2 mm and the duration of the earthquake was 19.8 seconds.
- 1 shallow volcanic earthquake
- 2 deep volcanic earthquakes
- 4 episodes of continuous tremor, with an amplitude of 0.5 to 1.7 mm, mainly 0.5 mm.

Ili Lewotolok - 02.074.2022 / 05:47 - PVMBG Magma Indonesia webcam - one click to enlarge

Ili Lewotolok - 02.074.2022 / 05:47 - PVMBG Magma Indonesia webcam - one click to enlarge

For 02.07.2022 / from 00h to 12h, the PVMBG reports 21 eruption earthquakes and 47 emission earthquakes.


Based on the results of a thorough analysis and assessment, on June 14, 2022, the activity level of the Ili Lewotolok volcano is still at level III (watch) with new recommendations adjusted to the latest potential threats.
At Level III (Siaga) activity level, people around Mount Ili Lewotolok as well as visitors/climbers/tourists are recommended not to carry out activities within 3 km of the summit/ crater of Mount Ili Lewotolok, 3.5 km radius for the southeast sector, a radius of 4 km for the east and northeast sectors. Residents of Lamawolo Village, Lamatokan Village and Jontona Village should always be aware of the potential threat of incandescent lava and hot clouds from the eastern part of G. Ili Lewotolok peak/crater.

 

Sources: PVMBG, Magma Indonesia

Piton de La Fournaise - Illustration of the deformation over the last six months (the eruptive and intrusive periods are respectively in red and green). The variations in distance between two GPS receivers crossing the Piton de la Fournaise building are shown here, at the top (reference BOMG; top), at the base of the terminal cone (reference FOAG; middle) and in the far field (reference PRAG; bottom). A rise is synonymous with elongation and therefore swelling of the volcano; conversely a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPF-IPGP)

Piton de La Fournaise - Illustration of the deformation over the last six months (the eruptive and intrusive periods are respectively in red and green). The variations in distance between two GPS receivers crossing the Piton de la Fournaise building are shown here, at the top (reference BOMG; top), at the base of the terminal cone (reference FOAG; middle) and in the far field (reference PRAG; bottom). A rise is synonymous with elongation and therefore swelling of the volcano; conversely a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPF-IPGP)

In May 2022, the OVPF-IPGP recorded at the level of the Piton de la Fournaise massif in total:
- 23 superficial volcano-tectonic earthquakes (0 to 2.5 km above sea level) under the summit craters;
- 2 deep earthquakes (below sea level);
- 619 landslides (in the Cratère Dolomieu, the ramparts of the Enclos Fouqué and the Piton de Crac, and the Rivière de l'Est).

A weak resumption of inflation was observed, this one is the witness of a pressurization of the reservoir and its replenishment by deeper magmas.

 

The deep replenishment of magma and the pressurization of the superficial magmatic reservoir which had resumed following the end of the last eruption on January 17, 2022, and which were marked by an inflation of the building and an increase in the fluxes of CO2 in the ground in far field, seem to have ceased since mid-May. It should be noted that since 2016, the deep recharges under the Piton de la Fournaise have been done by pulses, thus such phases of calm in the deformations and seismicity have already been observed on several occasions since 2016 over periods ranging from 15 at around 80 days. Given the amount of magma already present in the superficial magma reservoir, the next deep magma pulse towards the superficial reservoir could be the trigger for a new eruption as has been observed in the past. The resumptions of the pressurization of the magmatic reservoir had then only preceded an eruption by 1 to 25 days.

 

Source: OVPF

The Interreg Hatari project on the sources of volcanic and seismic risks in the Comoros has just started at the summit of Karthala - doc. OVPF 06.2022

The Interreg Hatari project on the sources of volcanic and seismic risks in the Comoros has just started at the summit of Karthala - doc. OVPF 06.2022

The 2nd year of the Interreg Hatari project on the sources of volcanic and seismic risks in the Comoros has just started at the summit of Karthala.

During their fieldwork, teams from the Volcanological Observatory of Piton de la Fournaise (OVPF/IPGP), the Volcanological Observatory of Karthala (OVK/CDNRS), including master's and doctoral students and post-graduate researchers -doc, had the opportunity to discuss volcanic risks with the Comorian authorities, the French Ambassador to the Comoros and his team, a group of international volunteers and the Interreg Focal Point of the Ministry of Foreign Affairs and Cooperation International.

 

Source: OVPF-IPGP

Reynisfjara - Black sand beach in the fog - photo archives © Bernard Duyck 2015 - one click to enlarge

Reynisfjara - Black sand beach in the fog - photo archives © Bernard Duyck 2015 - one click to enlarge

Vegagerðin (the Road and Coastal Authority) is working on a new electrical panel for Reynisfjara (known to tourists as "Black Sand Beach") in southern Iceland.
The panel will flash red when the sea conditions are particularly dangerous. Vegagerðin used police incident records to decide what wave height poses a high hazard to visitors.

A warning sign is in the works, with flashing lights to warn visitors. It will be installed next to all existing traffic signs between the car park and the beach. Red lights will warn of danger, but there will be no green lights when the waves are at their calmest.

 

Sources: RUV & https://www.vegagerdin.is/

Reynisfjara - basalt columns and black sand - photo archives © Bernard Duyck 2015 - one click to enlarge

Reynisfjara - basalt columns and black sand - photo archives © Bernard Duyck 2015 - one click to enlarge

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