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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, #Sismologia
Sakurajima - eruption of 07.24.2022 / 8:50 p.m. - Doc. JMA

Sakurajima - eruption of 07.24.2022 / 8:50 p.m. - Doc. JMA

 Sakurajima - 24.07.2022 / 21h12 - Doc. JMA

Sakurajima - 24.07.2022 / 21h12 - Doc. JMA

Around 8:05 p.m. on the 24th, an explosive eruption occurred at the Minamidake Crater of Sakurajima (Kagoshima Prefecture), and large volcanic bombs dispersed about 2.5 km from the crater.

The Japan Meteorological Agency has raised the eruption alert level from 3 (mountain entry restrictions) to the highest level 5 (Evacuation from hazardous residential areas is required). Kagoshima City issues an evacuation order to areas within 3 km of Minamidake's summit crater for 33 families in Arimura-cho and Furusato-cho.

Sakurajima - eruption of 25.07.2022 / 01:51 - doc. JMA

Sakurajima - eruption of 25.07.2022 / 01:51 - doc. JMA

Sakurajima Volcano Erupts, Triggers Highest Alert & Evacuations - Jul. 24, 2022 桜島火山の噴火 - https://youtu.be/MYyTt3g2Zt4

On Sakurajima, the expansion of the mountain body was gradually observed from July 18 by tiltmeters and extensometers, and eruptions were observed once on the 22nd and four times on the 23rd. Both were full-scale eruptions rather than explosive eruptions.

Since the JMA introduced the alert level for volcanic eruptions nationwide in 2007, this is the second time the level has been raised to 5 since it was announced on the island of Kuchinoerabu in the Kagoshima prefecture in 2015, and in Sakurajima.

Kazuhiro Ishihara, professor emeritus of Kyoto University, points out that "although it was frequent in the 1970s and 1980s, it is a large eruption that is in the top three of the last 20 years".

Sakurajima - 2nd eruption 07.25.2022 / 06:31 - Doc. JMA

Sakurajima - 2nd eruption 07.25.2022 / 06:31 - Doc. JMA

A new report from the JMA informs of an eruptive episode this July 25 at 06:31, accompanied by a plume of ash at 2,200 meters above the crater, and entering the clouds

 

Sources: JMA, Asahi, VAAC Tokyo

Sheveluch - enhanced signal of 3.04 DU of SO2 at a distance of 13.1 km from the Sheveluch. Other nearby sources: the Kliuchevskoi, Bezymianny and Tolbatschik volcanoes. - image Sentinel-5P / Tropomi - Doc. DLR / BIRA / ESA

Sheveluch - enhanced signal of 3.04 DU of SO2 at a distance of 13.1 km from the Sheveluch. Other nearby sources: the Kliuchevskoi, Bezymianny and Tolbatschik volcanoes. - image Sentinel-5P / Tropomi - Doc. DLR / BIRA / ESA

Lava dome growth continues at Sheveluch. Strong fumarolic activity, incandescence of the lava dome, explosions, and hot avalanches accompany this process. Satellite data from KVERT showed an extensive ash plume about 51 km southeast of the volcano, and a thermal anomaly over the volcano.

Tropomi/Sentinel-5P mentions an improved signal of 3.04 DU of SO2 at a distance of 13.1 km from the Shiveluch. Other nearby sources: the Kliuchevskoi, Bezymianny and Tolbatschik volcanoes.

The aviation code remains orange.

 

Sources: KVERT, Tropomi and VAAC Tokyo

Stromboli - on 25.07.2022 from 02:56 UTC, recording of a series of explosions in the area of ​​the North crater of Stromboli - Doc. INGV

Stromboli - on 25.07.2022 from 02:56 UTC, recording of a series of explosions in the area of ​​the North crater of Stromboli - Doc. INGV

The National Institute of Geophysics and Volcanology, Etneo Observatory, announces that the analysis of video surveillance cameras, from 02:56 UTC, recorded a series of explosions from the area of ​​​​the North crater of Stromboli, the most strong occurred at 02:56:30 UTC.

Stromboli - on 25.07.2022 from 02:56 UTC, recording of a series of explosions in the area of ​​the North crater of Stromboli - Doc. INGV

Stromboli - on 25.07.2022 from 02:56 UTC, recording of a series of explosions in the area of ​​the North crater of Stromboli - Doc. INGV

Stromboli - 25.07.2022 - abundant fallout in the Sciara del Fuoco - Doc. INGV

Stromboli - 25.07.2022 - abundant fallout in the Sciara del Fuoco - Doc. INGV

The material produced fell abundantly along the entire Sciara del Fuoco, while there were no significant fallouts of coarse material in the Pizzo area. After the more intense initial explosive phase, Strombolian activity continues at the N2 vent of the North Crater area, with frequent low-intensity explosions.

The seismic signal after the maximum amplitude values ​​reached at 2:56 UTC showed a rapid decrease reaching at 3:40 am values ​​similar to those before the explosion. The tilt grating shows a modest momentum shift (about 0.05 mrad) in the N275E component from the TDF (Timpone del Fuoco) station at 2:55 a.m. No significant change in the high frequency GNSS network.

 

Source: INGV OE, INGVvulcani

Vatnajökull / Bardarbunga volcano - location of earthquakes and magnitude as of 24.07.2022 / 4:30 p.m. - Doc. IMO
Vatnajökull / Bardarbunga volcano - location of earthquakes and magnitude as of 24.07.2022 / 4:30 p.m. - Doc. IMO
Vatnajökull / Bardarbunga volcano - location of earthquakes and magnitude as of 24.07.2022 / 4:30 p.m. - Doc. IMO

Vatnajökull / Bardarbunga volcano - location of earthquakes and magnitude as of 24.07.2022 / 4:30 p.m. - Doc. IMO

On July 24, 2022 at 1:23 p.m. there was a magnitude 4.4 earthquake and almost half an hour later another 4.9 in the northern caldera of Bárðarbunga, Iceland. These larger earthquakes were accompanied by a number of smaller ones.
The last time an earthquake of this magnitude was recorded was in January 2020 and before that in January 2018. Earthquakes of this magnitude are not uncommon in Bárðarbunga and a total of 50 more than 4.0 have been recorded since the end of the eruption at Holuhrauni in early 2015. .
In the photo you can see the so-called Shakemap, which describes the zone of influence of the second earthquake.

 

Source: IMO

Bardarbunga - seismogram 23-24.07.2022 - Doc. CamVolcSeis VON/VONK station, plot provided by Vedurstofan

Bardarbunga - seismogram 23-24.07.2022 - Doc. CamVolcSeis VON/VONK station, plot provided by Vedurstofan

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