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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
Nyiragongo - lava flows on the right of the Sentinel 1 image of 25.05.2021 - Doc. Copernicus - one click to enlarge

Nyiragongo - lava flows on the right of the Sentinel 1 image of 25.05.2021 - Doc. Copernicus - one click to enlarge

According to an AFP correspondent at the Belga agency, two long cracks appeared on May 25 in the city of Goma.

One has split the ground in the western part of the city and stretches for several hundred meters, between Mount Goma, which marks the northern limit of the city, to the general hospital and the shores of the lake. Kivu.

The other, nearly a hundred meters long, appeared at the end of the morning near Goma airport, in the northeast of the city, on the roadway of the main road leaving Goma for Butembo, towards the north. of the province.

 

Goma - crevasses in the road - photo georiska.africamuseum.be/


 

The preliminary models obtained show that the deformation recorded by the stations of the KivuGNet network since the start of the eruption (last data processed on 05/24/2021) is compatible with the opening (~ 1m) and the migration of a shallow dyke (0-4km) from the southern flank of Mount Nyiragongo to the south for about 10km. These initial estimates are likely to change with the analysis of additional data.
A column of ash was observed above the volcano and ash falls were reported in town this morning of Tuesday, May 25.

The United Nations fears a possible eruption, as the Nyiragongo crater is once again filling with lava.

Nyiragongo and goma region - Sentinel-1 interferogram 19.05.2021 - 25.05.2021 - Doc. Copernicus via georiska.africamuseum.be/

Nyiragongo and goma region - Sentinel-1 interferogram 19.05.2021 - 25.05.2021 - Doc. Copernicus via georiska.africamuseum.be/

The toll of the eruption has increased: 32 dead and at least 5,000 homeless. Half a million people risk a shortage of drinking water, due to a damaged reservoir ...

 

Sources: RTBF Info 25.05.2021 / 2:33 p.m. & georiska.africamuseum.be/

Etna - the active summit craters and the SE crater flows - image Sentinel-2 bands 12.8A, 4 of 24.05.2021 - one click to enlarge

Etna - the active summit craters and the SE crater flows - image Sentinel-2 bands 12.8A, 4 of 24.05.2021 - one click to enlarge

Etna SEC - the flows of May 19, 21 and 22 interpreted according to the Sentinel images of May 21, 22 and 24 - doc. INGV OE

Etna SEC - the flows of May 19, 21 and 22 interpreted according to the Sentinel images of May 21, 22 and 24 - doc. INGV OE

During the week of May 17 to 25, there were 4 episodes of lava fountains carried by the southeast crater (SEC) of Etna, respectively on May 19, 21, 22 and 24-25.

The evolutionary phenomenology of eruptive events was common to the four fountains observed, and consists of the resumption of Strombolian activity at the SEC followed by a gradual intensification up to the lava fountain.
This phenomenon was often accompanied by one or more flows fed by the same crater. The end of the activity of the lava fountains also marked the end of the explosive activity.

Etna SEC - the "tail shots" of May 23 and 25, 2021 - webcam therm. Montagnola INGV and photo of 25.05. / from 10:30 am. - one click to enlargeEtna SEC - the "tail shots" of May 23 and 25, 2021 - webcam therm. Montagnola INGV and photo of 25.05. / from 10:30 am. - one click to enlarge

Etna SEC - the "tail shots" of May 23 and 25, 2021 - webcam therm. Montagnola INGV and photo of 25.05. / from 10:30 am. - one click to enlarge

After its 21 ° paroxysm, Etna produced "a tail stroke", this May 25 from 10:30 am, with intermittent explosive activity and the emission of old materials at a modest temperature, in the form of an ash plume. , lapilli and gas at an altitude of about 4,000 meters. This episode lasted until 11:50 loc.

According to Boris Behncke, it is a repetition of the nocturnal "tail stroke", captured by the thermal webcam of the Montagnola on May 23 at 2:01 am (following the paroxysm of 05/22).

Etna SEC- Lava fountain on 25.05.2021 from 8:20 p.m., accompanied by an ash plume - photo Boris Behncke

Etna SEC- Lava fountain on 25.05.2021 from 8:20 p.m., accompanied by an ash plume - photo Boris Behncke

Etna SEC- 25.05.2021 / 8:45 p.m. - 3 mouths are active in the Saddle - photo Boris Behncke

Etna SEC- 25.05.2021 / 8:45 p.m. - 3 mouths are active in the Saddle - photo Boris Behncke

Lava fountaining night at Etna ! On May 25, beginning of this activity 8:20 pm, generating an eruptive column going up to 6000 m at sea level; it lasted a little over an hour.

Etna - trémor at 26.05.2021 / 08h UTC - Doc. INGV OE

Etna - trémor at 26.05.2021 / 08h UTC - Doc. INGV OE

The INGV reports on May 26 at 03:19 loc. / 01:19 UTC the resumption of weak Strombolian activity at the SE crater

At 03:45 (01:45 UTC), Strombolian activity increases at the SE crater. Based on the forecast model, the eruptive cloud produced by the current activity disperses towards E.
From around 00:40 UTC there is a sudden increase in the mean amplitude of the volcanic tremor which is currently at high levels. The center of gravity of the sources of volcanic tremor is located in the region of the south-eastern crater at an altitude of 2800 m s.l.m ...

Strombolian activity evolves towards the lava fountain around 01:55 UTC. According to the forecast model, the eruptive cloud produced by the current activity disperses to the east.

From around 02:00 UTC, a decrease in the average amplitude of the volcanic tremor was observed which continued, with some fluctuations, in the following hours.

At 05:47 (03:47 UTC) the analysis of the images of the CCTV cameras shows that the lava fountain has ceased its activity.


The INGV reports that at 06:46 am (04:46 UTC), the explosive activity in the southeast crater has ceased. This activity fed a flow which moved along the flank of the southeast crater, towards the SW.


Sources: INGV OE & Boris Behncke weekly bulletin - INGV

Etna SEC - 05.26.2021 / 09:06 - INGV webcam

Etna SEC - 05.26.2021 / 09:06 - INGV webcam

Update: At around 09:40 UTC, an increase in the average amplitude of the volcanic tremor was observed, whose values remain at high levels. The center of gravity of the volcanic tremor sources is located in the region of the southeast crater at an altitude of about 2200 m above sea level ... a lava fountain is underway at the southeast crater.

At around 11am UTC, the lava fountain feeds a lava flow which is propagating in a southwest direction.
There is an increase in explosive activity which forms a volcanic cloud at an altitude of about 7,000 m above sea level.

Etna - trémor at 05.26.2021 / 1 p.m. - Doc. INGV OE

Etna - trémor at 05.26.2021 / 1 p.m. - Doc. INGV OE

Etna SEC - 05.26.2021 / 10:36 am - webcam INGV

Etna SEC - 05.26.2021 / 10:36 am - webcam INGV

Etna SEC - 05.26.2021 / 11:03 am - webcam INGV

Etna SEC - 05.26.2021 / 11:03 am - webcam INGV

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