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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

An important change to the dome of Sinabung, which this February 12 presents a wafer of lava extruded at the top, a little unbalanced and which will generate more  collapses.

Sinabung - morphological change at the top of the dome - photo Sadrah Peranginangin 12.02.2021 - one click to enlarge

Sinabung - morphological change at the top of the dome - photo Sadrah Peranginangin 12.02.2021 - one click to enlarge

Sinabung - fall of incandescent blocks on 02.12.2021 / 9:55 p.m. WIB, over 2,000 meters towards the ESE - via Beidar Sinabung Sadrah

Sinabung - fall of incandescent blocks on 02.12.2021 / 9:55 p.m. WIB, over 2,000 meters towards the ESE - via Beidar Sinabung Sadrah

This February 12, the PVMBG recorded:

- two earthquakes related to pyroclastic flows,

- 209 collapse / avalanche earthquakes, with an amplitude of 2 to 95 mm and a duration of 17 to 230 seconds.

- 7 blast / emission earthquakes, with an amplitude of 5 to 78 mm and the earthquake lasted 20 to 75 seconds.

- 36 low frequency earthquakes

- 92 hybrid / multiphase earthquakes.

 

The level of activity remains unchanged

 

Sources: PVMBG, Magma Indonesia & Beidar Siinabung

Sinabung - seismicity on 02.12.2021 ... increasing - Doc. Magma Indonesia

Sinabung - seismicity on 02.12.2021 ... increasing - Doc. Magma Indonesia

In Merapi, the seismicity of February 12 is characterized by:

- 151 collapse / avalanche earthquakes, with an amplitude of 3-45 mm and a duration of 10-167 seconds from the earthquake.

- 2 emission earthquakes, with an amplitude of 4 to 8 mm and the earthquake lasted 11 to 15 seconds.

- 13 hybrid / multiphase earthquakes

- 1 shallow volcanic earthquake, with an amplitude of 27 mm, and the duration of the earthquake was 9 seconds.

- 1 distant tectonic earthquake.

 

The level of activity remains unchanged

 

Source: PVMBG, Magma Indonesia

Merapi - 02.12.2021 / 11.58pm WIB - Doc. PVMBG / PGM NGEPOS

Merapi - 02.12.2021 / 11.58pm WIB - Doc. PVMBG / PGM NGEPOS

Merapi - the summit of its domes on 02/13/2021 / 12:16 p.m. WIB - Doc. PVMBG / PGM NGEPOS

Merapi - the summit of its domes on 02/13/2021 / 12:16 p.m. WIB - Doc. PVMBG / PGM NGEPOS

The activity of Etna remains in the standards of the last days, with a stable tremor, but high.

Etna - trémor at 13.02.2021 / 03:10 - Doc. INGV OE


At nightfall on February 11, 2021, Strombolian activity continues at the south-eastern crater, sporadic sequences of explosions occur at the Voragine crater, and rarer but fairly powerful explosions at the Bocca Nuova crater.

Etna - Sentinel-2 image enhanced nat. colors + IR overlay 02.11.2021 - by Pierre Markuse / Copernicus data - one click to enlarge

Etna - Sentinel-2 image enhanced nat. colors + IR overlay 02.11.2021 - by Pierre Markuse / Copernicus data - one click to enlarge

Etna SEC - Morphology of the south-eastern crater on 02.11.2021 - photo Gio Giusa

Etna SEC - Morphology of the south-eastern crater on 02.11.2021 - photo Gio Giusa

After a beautiful informative photo of the morphology of the south-eastern crater, its activity is located deep in the large scar left by the collapse of the side of the south-eastern crater on December 13, 2020, where three small vents make small explosions and build tiny cinder cones this February 12, 2021 at nightfall.

 

Sources: Boris Behncke, Gio Giusa, Sentinel-2 / P.Markuse

Etna SEC, seen from Biancavilla, on the southwest flank of the volcano - explosions at vents located in the scar this 02.12.2021 - photo Boris Behncke

Etna SEC, seen from Biancavilla, on the southwest flank of the volcano - explosions at vents located in the scar this 02.12.2021 - photo Boris Behncke

The explosive-effusive phase of the Klyuchevskoy eruption, which began last October, is over.

According to seismic data from KB GS RAS (http://www.emsd.ru/~ssl/monitoring), the magnitude of the volcanic tremor decreased from 34 to 0.89 mkm / s from February 07 to 08. The temperature of the volcano's thermal anomaly fell sharply on February 07 and continues to drop. There was no Strombolian activity on the night of February 11 to 12. Only the low activity of the volcano's fumaroles is noted.

February 08, 2021 can probably be considered as the end date of the eruption.

 

Moderate gas-vapor activity from the volcano continues. The danger of ash explosion up to 19,700-23,000 ft (6-7 km) a.s.l. Remain however. Ongoing activities could affect low-flying planes.

The aviation code has been lowered to yellow.

 

Source: KVERT

Klyuchevskoy - activity ended on 02.11.2021 / 10 p.m. - IVS FEB RAS KVERT webcam

Klyuchevskoy - activity ended on 02.11.2021 / 10 p.m. - IVS FEB RAS KVERT webcam

The Kīlauea volcano is erupting. His USGS volcano alert level is at WATCH

Lava activity is confined to Halemaʻumaʻu crater, with lava erupting from a vent on the northwest side of the crater.

As of the morning of February 11, the lava in the active potion west of Halema'uma'u lake was about 215m deep, with the eastern part of the lava lake solidifying on the surface.

Summit tiltmeters show inflationary tilt continuing over the past day.

Sulfur dioxide emission rate measurements taken on February 10 were approximately 1,600 t / d, below the range of pre-2018 lava lake emission rates.

Seismicity remains high but stable, with high earthquakes and a few minor earthquakes.

 

Source: HVO

Kilauea - Halema'uma'u - active western (left) part of the lava lake, which has hot glowing lava visible at the boundaries between the plates on the lava lake. The inactive eastern (right) part of the lake looks dark. USGS photo taken by N. Deligne on February 10, 2021.

Kilauea - Halema'uma'u - active western (left) part of the lava lake, which has hot glowing lava visible at the boundaries between the plates on the lava lake. The inactive eastern (right) part of the lake looks dark. USGS photo taken by N. Deligne on February 10, 2021.

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