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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 makes the show with a new eruptive episode on June 24, 2021, which produced lava fountains of three mouths ( " saddle " zone), an overflow of lava towards the southeast, and an eruptive column which reached a height of about 10 kilometers above sea level. After the paroxysm, the effusive mouth was reactivated on the lower south-eastern slope of the South-East Crater, which emits a small flow of wash.

 

Activity in details:

During the night and dawn of June 24, weak effusive activity continued at the open mouths at the southeast base of the southeast crater, which fed a lava flow to the west wall of theValle del Bove with a front at about 2600 m. At dawn today a small stream was bustling near the effusive mouth, a few tens of meters long.

Etna SEC - 06.24.2021 / 9.45am - therm webcam. EMCT / INGV

Etna SEC - 06.24.2021 / 9.45am - therm webcam. EMCT / INGV

and from 09:05 UTC, there is a resumption of Strombolian activity at the Southeast Crater, which is accompanied by the emission of modest amounts of volcanic ash. In addition, the emission of a small lava flow from the lower southeast flank of the crater continues to the South East.

Strombolian activity at the southeast crater gradually turned into a lava fountain, with at least three explosive vents; at the same time an overflow of lava started in a south-westerly direction.

The activity of the lava fountain at three mouths of the southeast crater produced jets of lava 400 to 500 m high, while the eruptive column reached a height of 9 to 10 km above the level of the sea, the dispersion of the eruptive cloud concerns the East-North-East sector of the volcano.

Etna SEC - Activity from 06.24.2021 - photos Gio Giusa  / FB - one click to enlarge
Etna SEC - Activity from 06.24.2021 - photos Gio Giusa  / FB - one click to enlarge

Etna SEC - Activity from 06.24.2021 - photos Gio Giusa / FB - one click to enlarge

The INGV announces at 10:45 UTC that the explosive activity at the Southeast Crater is decreasing sharply. The lava fountains have ceased; the weak strombolian activity continues accompanied by modest ash emissions. There is an ash fall in the Linguaglossa region (northeast side of Mount Etna).

The southwest-facing lava overflow is still fed ; on the other hand, the small lava flow present on the lower southeast flank of the cone seems to cool down before the start of this eruptive episode.

After the cessation of the explosive activity at the level of the Southeast crater, the gradual reactivation of the effusive vent located at an altitude of about 3050 m. on the south-eastern flank of the cone was observed, with the emission of a small lava flow. This flow reached, at 14:20 UTC, an altitude of about 2800 m, and is slowly moving towards the Valle del Bove.

From 23:50 UTC on June 24, an increase in Strombolian activity is observed at the level of the SE crater.

Etna SEC - 06.25.2021 / 01h58 - LAVE webcam

Etna SEC - 06.25.2021 / 01h58 - LAVE webcam

Etna SEC - 25.06.2021 - lava fountain and lava flows - photo Boris Behncke

Etna SEC - 25.06.2021 - lava fountain and lava flows - photo Boris Behncke

Here we go again ... around 01:00 UTC on June 25, from the surveillance cameras, it is observed that the Strombolian activity of the southeast crater gradually turned into a lava fountain.
From around 01:15 UTC an overflow of lava is also observed which, from the southern slope of the southeast crater, spreads in a southwest direction.
At 01:48 UTC, the southeast crater lava fountain ceased to be active, but there remains weak Strombolian activity. The eruptive cloud produced reached a height of about 8.5 km asl. derived from satellite data and, in accordance with the forecast model, its dispersion concerned the eastern sector of the volcano.


Regarding the lava overflow that has spread to the southwest, its front seems to settle at an altitude estimated at about 2900 m. altitude. On the south-eastern side of the south-eastern crater, the lava flow continues from 3050 m. asl. . The effusive vent feeds two main lava flows, the most advanced front of which is located at an altitude estimated at about 2700 m above sea level.
After the maximum amplitude at 01:30 UTC the volcanic tremor began a rapid descent still in progress

 

Sources: INGV OE, Boris Behncke and Gio Giusa

Etna SEC - 06.25.2021 / 02h58 - LAVE webcam

Etna SEC - 06.25.2021 / 02h58 - LAVE webcam

Etna - trémor variations in the late six days - Doc. INGV OE 25.06.2021

Etna - trémor variations in the late six days - Doc. INGV OE 25.06.2021

On June 25, 2021 at 04:43 WIB, three pyroclastic flows were observed at Merapi, and recorded on a seismogram with an amplitude of 75 mm and a duration of 61, 132 and 245 seconds. Maximum glide distance of 3,000 meters to the southeast. The smoke column is observable up to ± 1000 m above the peak.

After the warm clouds this morning, the seismicity was dominated by avalanches. Ash rains were reported in several places. The public is advised to remain calm, to comply with BPPTKG recommendations and to anticipate disturbances due to volcanic ash such as wearing masks and closing water supplies.

 

On June 25, 2021 at 7:33 am WIB, a pyroclastic flow was recorded on a seismogram with an amplitude of 28 mm and a duration of 104 seconds. The glide distance is 1000 m to the southeast. A column of smoke as high as 600 m was observed.

 

Sources: BPPTKG & Magma Indonesia

Merapi - 06.25.2021 / 04:50 - webcam Panguk TRM Badan Geologi

Merapi - 06.25.2021 / 04:50 - webcam Panguk TRM Badan Geologi

Merapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlarge
Merapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlargeMerapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlarge

Merapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlarge

Merapi - 06.25.2021 / 07:35 - explosive plume and pyroclastic flow - Panguk webcam

Merapi - 06.25.2021 / 07:35 - explosive plume and pyroclastic flow - Panguk webcam

At Suwanosejima Ontake Crater, eruptive activity has become more active as the eruptions are repeated over a long period of time.

The volcanic alert level went from 2 (crater zone regulation) to 3 (mountain entry regulation), with a danger notice within a radius of 2 km. due to projections of volcanic bombs.

 

The explosions have multiplied since the 20th at the Otake crater: ... 9 times on the 20th, 10 times on the 21st, 15 times on the 22nd, 8 times on the 23rd. On June 24th at 3:00 pm, the observatory counted 6 explosions (provisional number) .

At 10:54 p.m. on June 21 and 12:04 a.m. on June 22, the explosions ejected ballistic projectiles. Large volcanic bombs scattered about 900 m. from the crater in the northwest and southeast directions, respectively.

On top of that, multiple volcanic bombs were scattered from the crater several hundred meters away.

 

Source : JMA

Suwanosejima - 06.22.2021 / 07:26 - JMA webcam

Suwanosejima - 06.22.2021 / 07:26 - JMA webcam

Suwanosejima - 06/23/2021 / 6:06 p.m. & 10:50 p.m. - JMA webcam
Suwanosejima - 06/23/2021 / 6:06 p.m. & 10:50 p.m. - JMA webcam

Suwanosejima - 06/23/2021 / 6:06 p.m. & 10:50 p.m. - JMA webcam

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