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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
Etna NSEC - 10.05.2020 / 00h21 weak Strombolian explosion at the "saddle cone" of the new crater of the Southeast - photo Boris Behncke

Etna NSEC - 10.05.2020 / 00h21 weak Strombolian explosion at the "saddle cone" of the new crater of the Southeast - photo Boris Behncke

During the first hours of May 10, 2020, a new episode of modest Strombolian activity took place in the "saddle cone" of the New Crater southeast of Etna.

The INGV OE reports that the surveillance networks recorded at 03:27 hours (01:27 UTC), a continuous strombolian activity, with an ejection of products beyond the crater. Some blocks partially accumulate at the edge of the crater while others roll along the slopes.
At the same time as the eruptive activity of the New Southeast Crater, there is also an increase in the eruptive activity of Voragine, with ballistic ejections beyond the crater edge.

From approximately 04:00 hours, there is a significant decrease in Strombolian activity in the New Crater of Southeast, where a strong degassing remains. At La Voragine crater, an explosive activity is less strong and frequent than the previous hours.

Etna - 10.05.2020 - simultaneous explosions with Voragine (on the left) and with the saddle cone of the SEC-webcam therm. Montagnola 0h54 - stronger explosion in the saddle cone - visible webcam Montagnola 01h00 - one click to enlargeEtna - 10.05.2020 - simultaneous explosions with Voragine (on the left) and with the saddle cone of the SEC-webcam therm. Montagnola 0h54 - stronger explosion in the saddle cone - visible webcam Montagnola 01h00 - one click to enlarge

Etna - 10.05.2020 - simultaneous explosions with Voragine (on the left) and with the saddle cone of the SEC-webcam therm. Montagnola 0h54 - stronger explosion in the saddle cone - visible webcam Montagnola 01h00 - one click to enlarge

As for the amplitude of the volcanic tremor, it showed a sudden increase from 11:30 p.m. UTC on May 9, reaching its maximum value around 12:30 p.m. UTC on May 10, and then remained at high values. A rapid decline is observed, with a return to average levels around 02:20 UTC on May 10.

The location of the source of the tremor is located near the area of ​​the New Southeast Crater, at a depth of about 2800-3000 meters above mean sea level.

Etna - variation of the amplitude of the tremor at 10.05.2020 / 9.10 am - Doc. INGV OE

Etna - variation of the amplitude of the tremor at 10.05.2020 / 9.10 am - Doc. INGV OE

In Kamchatka, volcanic activity marks the volcanoes Ebeko, Klyuchevskoy, and Karymsky.

In Klyuchevskoy, Strombolian activity persists, with a lava flow on the south-eastern flank, and gas and ash explosions, with a cloud spotted at 5,500-6,000 meters extending over 50 km to the east.

At the Ebeko, an explosion of gas and ash is observed, with a plume at 1,500 meters asl., Drifting towards the southwest over 5 km.

In Karymsky, an emission of gas and vapor, containing a little ash, is located by the satellites, drifting up to 77 km to the ESE of the volcano.

Aviation codes are orange for Klyuchevskoy and Ebeko, yellow for Karymsky.

 

Source: KVERT & VAAC Tokyo

Karymsky - photo archive KVERT 09.09.2019 / А. Маневич. ИВиС ДВО РАН, KVERT

Karymsky - photo archive KVERT 09.09.2019 / А. Маневич. ИВиС ДВО РАН, KVERT

At Fuego, a change in the type of activity is recorded by the seismic and acoustic networks from May 5, 2020 .

On the evening of May 8, Insivumeh reports that a lava flow has been observed since the morning, in the direction of Barranca Ceniza reaching a length of about 400 meters. It is accompanied by almost constant incandescence at the crater and avalanches towards the vegetation zone over 1 km. The explosions remain weak to moderate, with shock waves and ash plumes reaching 4,800 m. asl.

 

Sources: Insivumeh & Sentinel-2

Fuego - 09.05.2020 - Sentinel image 2 bands 7,6,2 / Insivumeh - one click to enlarge

Fuego - 09.05.2020 - Sentinel image 2 bands 7,6,2 / Insivumeh - one click to enlarge

Fuego - 10.05.2020 - Sentinel-2 L1C bands 12,11,4 image - one click to enlarge

Fuego - 10.05.2020 - Sentinel-2 L1C bands 12,11,4 image - one click to enlarge

An overview of Nishinoshima, in the Ogasawara Islands in southern Japan, was conducted by the Japan Coast Guards on April 29, 2020.

The surface of the slag cone has been renewed and deposits of sulfur can be seen in places on the northeast surface of the cone.

Although it cannot be seen from the front of the image, it appears that the collapsed crater southwest of the summit that appeared on April 19 has been buried again. Between April 29 and the previous sighting on April 19, there was obviously a good activity.

Thermal images are also interesting. Although the exit is the same, you can see the lava flow move clockwise through the pyroclastic cone and head south. A beautiful fan of lava in the north direction, and a flow to the east coast consists of three arms.

 

Source: Japan Coast Guards - link via Shérine France

Nishinoshima - summit of the active cone and sulfur deposits on 04.29.2020 / 12:40 p.m. - photo Japan Coast Guards

Nishinoshima - summit of the active cone and sulfur deposits on 04.29.2020 / 12:40 p.m. - photo Japan Coast Guards

Nishinoshima - lava flow at sea - 04.29.2020 / 12:30 p.m. - photo Japan Coast Guards

Nishinoshima - lava flow at sea - 04.29.2020 / 12:30 p.m. - photo Japan Coast Guards

 Nishinoshima - thermal camera image of the lava flows on April 29, 2020 / 12:30 p.m. - photo Japan Coast Guards

 Nishinoshima - thermal camera image of the lava flows on April 29, 2020 / 12:30 p.m. - photo Japan Coast Guards

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