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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

At Etna, a weak Strombolian activity at the eastern mouth of the SE crater is observed from 17:30 UTC on February 20, 2021. The average amplitude of the volcanic tremor gradually increases, being located in the average level. The source of the tremor is located under the SE crater, at a depth of 2500-2600 m above sea level.

From around 19:30 UTC, the average amplitude of the volcanic tremor shows another sudden increase, in the high level. Lava overflow is observed from the mouth east of the SE Crater, which began shortly after 9:30 p.m. UTC. The lava flow is heading towards the Valle del Bove. The amplitude of the volcanic tremor continues to increase.

Etna - strombolian activity on 02.20.2021 / 7:58 p.m. - LAVE webcam

Etna - strombolian activity on 02.20.2021 / 7:58 p.m. - LAVE webcam

Around 10 p.m., the activity at the eastern mouth of the SE crater gradually shifted to a pulsating lava fountain. The lava flow generated by the overflow on the eastern flank of the cone, previously communicated, has traveled approximately 150-200 m.

Etna - lava fountain on 02.20.2021 / 11:21 p.m. - EMOT / INGV OE webcam

Etna - lava fountain on 02.20.2021 / 11:21 p.m. - EMOT / INGV OE webcam

At 12:28 am - 12:30 am on February 21, according to the INGV, the activity of the lava fountain further intensified, generating jets of lava at an altitude of 800-1000 m above the southeast crater. , but remains however confined to the eastern part of the south-eastern crater. A relatively diluted eruptive column forms at the top of the volcano. The lava flow directed towards the Valle del Bove has reached a length of about 1 km, with a front that rises to about 2800 m. Shortly afterwards, an overflow of lava began from the "saddle mouth", feeding a lava flow directed towards the southwest. The average amplitude of the volcanic tremor shows high values ​​with a tendency to increase further. The location of the source of the tremor remains below the SE crater. Infrasound signals also increase in both the frequency of occurrence and the energy of infrasonic transients.

Etna - activity on 02.21.2021 at 12:28 am and 1:00 am respectively - Doc. LAVE webcam & INGV OE webcam - one click to enlargeEtna - activity on 02.21.2021 at 12:28 am and 1:00 am respectively - Doc. LAVE webcam & INGV OE webcam - one click to enlarge

Etna - activity on 02.21.2021 at 12:28 am and 1:00 am respectively - Doc. LAVE webcam & INGV OE webcam - one click to enlarge

Etna - trémor on 02.21.2021 / 03.10 a.m. - Doc. INGV OE. we can clearly see the 4 peaks of successive paroxysms - one click to enlarge.

Etna - trémor on 02.21.2021 / 03.10 a.m. - Doc. INGV OE. we can clearly see the 4 peaks of successive paroxysms - one click to enlarge.

Etna - thermal anomalies at 02.21.2021 / 01.45 a.m. - DocMirova _MODIS_Latest10NTI

Etna - thermal anomalies at 02.21.2021 / 01.45 a.m. - DocMirova _MODIS_Latest10NTI

Between 1:00 a.m. and 1:15 a.m., the eruptive activity at the southeast crater rapidly diminished and ceased completely around 1:20 a.m. The lava flows are still advancing slowly, the fronts of the longest flow in Valle del Bove, settling about 3.5-4 km away from the mouth and at an altitude of between 1700 and 1800 m. The southwest lava flow only traveled a few hundred meters.

From 00:50 UTC, the average amplitude of the volcanic tremor underwent a sudden and drastic decrease in its values ​​and reached the average level around 01:30 UTC. Currently, the parameter shows the tendency to decrease further. At the same time, infrasound signals also show a marked reduction in explosive activity.

Etna - stop of activity and flow in cooling on 02.21.2021 respectively at 01:33 and 07:09 - EMOT INGV OE webcamEtna - stop of activity and flow in cooling on 02.21.2021 respectively at 01:33 and 07:09 - EMOT INGV OE webcam

Etna - stop of activity and flow in cooling on 02.21.2021 respectively at 01:33 and 07:09 - EMOT INGV OE webcam

The fourth consecutive paroxysm of Etna was spectacular, but without any danger for the inhabitants.

Source: INGV-OE

FUERTE ERUPCIÓN DEL VOLCÁN PACAYA EN GUATEMALA HOY 19 DE FEBRERO 2021

The Pacaya volcano, from the afternoon of February 19, 2021, showed an increase in activity and ash dispersion according to INSIVUMEH reports. In its special volcanological bulletin No. 31-2021, the seismic monitoring indicates the recording of two new incremental pulses from 5 and 11 a.m., which generated a new lava flow on the northeast flank and the emission of ash plumes 500 meters above MacKenney crater.

The Pacaya volcano, from the afternoon of February 19, 2021, showed an increase in activity and ash dispersion according to INSIVUMEH reports. In its special volcanological bulletin No. 31-2021, the seismic monitoring indicates the recording of two new incremental pulses from 5 and 11 a.m., which generated a new lava flow on the northeast flank and the emission of ash plumes 500 meters above MacKenney crater.

The Pacaya volcano, from the afternoon of February 19, 2021, showed an increase in activity and ash dispersion according to INSIVUMEH reports. In its special volcanological bulletin No. 31-2021, the seismic monitoring indicates the recording of two new incremental pulses from 5 and 11 a.m., which generated a new lava flow on the northeast flank and the emission of ash plumes 500 meters above MacKenney crater.

Pacaya- seismogram of 19.02.2021 and corresponding activity on the thumbnails - Doc. Insivumeh - one click to enlarge

Pacaya- seismogram of 19.02.2021 and corresponding activity on the thumbnails - Doc. Insivumeh - one click to enlarge

The Pacaya maintains this February 20 Strombolian explosions, accompanied by expulsion of ballistic materials 100-300 meters above the crater; ash plumes are observed at certain times as high as 3,000 meters asl. and moved by strong winds to the south and southwest, over 10-25 km. A single lava flow remains active on the southern flank, 1,000 meters long. This type of activity may increase further in the coming hours.

Pacaya - activity of 20.02.2021 - Doc. Insivumeh report 02.20.2021 / 12:10 loc.

Pacaya - activity of 20.02.2021 - Doc. Insivumeh report 02.20.2021 / 12:10 loc.

The Pacaya National Park remains closed.

The general population is recommended to take into account the indications contained in the informative notices, to follow the recommendations of their authorities, to use a mask at all times, to cover their eyes with volcanic ash and in case they smell that their life is in danger, promote the principle of Self-evacuation.

Sources: Insivumeh & Conred

Merapi - boulder avalanche of 02.20.2021 / 2:54 p.m. - photo PVMBG

Merapi - boulder avalanche of 02.20.2021 / 2:54 p.m. - photo PVMBG

In Merapi, in activity level 3 / siaga, the seismicity of February 20 is dominated by:

- 124 collapse / avalanche earthquakes, with an amplitude of 3-38 mm and a duration of 8-140 seconds.

- 9 blast / emission earthquakes, with an amplitude of 2 to 18 mm and the earthquake lasted 10 to 22 seconds.

- 2 hybrid / multiphase earthquakes, with an amplitude of 3-4 mm, S-P 0.6-0.7 seconds and the duration of the earthquake 8-10 seconds.

 

Sources: PVMBG, Magma Indonesia, BPBD and BPPTKG

Merapi - seismicity of the last 7 days, finalized on 20.02.2021 - Doc. BPPTKG

Merapi - seismicity of the last 7 days, finalized on 20.02.2021 - Doc. BPPTKG

Merapi - the summit and the dome,  on 02.20.2021 / 3:33 p.m. - Doc. BPBD Sleman

Merapi - the summit and the dome, on 02.20.2021 / 3:33 p.m. - Doc. BPBD Sleman

Merapi - avalanche of incandescent blocks on 02.20.2021 / 6:27 p.m. - Doc. BPPTKG

Merapi - avalanche of incandescent blocks on 02.20.2021 / 6:27 p.m. - Doc. BPPTKG

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