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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
 Piton de La Fournaise - two eruptive cones active on 04/28/2021 / 2:30 a.m. UT - local 6:30 a.m. - Piton de Bert webcam - IRT-OVPF-IPGP - one click to enlarge

Piton de La Fournaise - two eruptive cones active on 04/28/2021 / 2:30 a.m. UT - local 6:30 a.m. - Piton de Bert webcam - IRT-OVPF-IPGP - one click to enlarge

At Piton de La Fournaise, after a few days without much visibility and visual observations, the intensity of the tremor seems to have started to decrease for 2 days.

The very bad weather conditions on the volcano (precipitation and thunderstorms) for more than two weeks have strongly impacted the OVPF surveillance network. Thus 17 sensors (16% of the OVPF network), including 12 located in the eastern sector of the volcano, are no longer operational due to the lack of energy (not enough sunlight to supply the solar panels for two weeks ) or lightning strikes.

An overview of the eruptive site by the aerial section of the gendarmerie and the PGHM this morning confirmed that the two eruptive cones were still active, and that the majority of the activity was done in a lava tunnel with few visible flows in area.

Piton de La Fournaise - the eruptive site on 04/28/2021 / 6:17 am - panoramic HD webcam - one click to enlarge

Piton de La Fournaise - the eruptive site on 04/28/2021 / 6:17 am - panoramic HD webcam - one click to enlarge

Over the last 24 hours, 2 superficial volcano-tectonic earthquakes (between sea level and the surface) have been recorded under the summit craters.

CO2 fluxes in the soil are still increasing in the far field (Plaine des Cafres and Plaine des Palmistes).

Averaged over the past few days, no significant trend can be seen in the deformations of the building (neither in deflation nor in inflation). This could suggest a deep magma flow entering the shallow magmatic reservoir equivalent to the outflow from the reservoir that feeds the eruptive site.

 

Source : OVPF press release dated 28.04.2021

Sinabung by TigaKicat on 04/28/2021 / between 5 a.m. and 7:21 a.m. WIB - photo Firdaus Surbakti / Beidar Sinabung

Sinabung by TigaKicat on 04/28/2021 / between 5 a.m. and 7:21 a.m. WIB - photo Firdaus Surbakti / Beidar Sinabung

At Sinabung, this April 28, the main crater is surmounted by a white plume with a strong thickness of about 50-500 meters from the summit, interspersed with an explosion and emission of gray plume.

Thanks to seismographic recordings of April 28, 2021, it was recorded:
6 times the eruption / earthquake eruption
138 collapse / avalanche earthquakes
3 blast / emission earthquakes
2 low frequency earthquakes
4 hybrid / multiphase earthquakes
1 deep volcanic earthquake

The activity is at 3 / siaga and the aviation code is orange.

Sources: PVMBG & Magma Indonesia

Sinabung by TigaKicat - the dome is imposing on 04.28.2021 / between 05:00 and 07:21 WIB - photo Firdaus Surbakti / Beidar Sinabung

Sinabung by TigaKicat - the dome is imposing on 04.28.2021 / between 05:00 and 07:21 WIB - photo Firdaus Surbakti / Beidar Sinabung

In the Reykjanes peninsula, the most eruptive activity is now located in the last craters of the eruption area, and in particular in the crater that can be seen on the mbl.is webcam.

Near this crater, steam is emitted by mosses which burn, under the effect of the intense heat of the eruption (The naturalist of the Meteorological Office)

There is no more activity in the southernmost crater and the northernmost one, from which only steam comes out. Thermal anomalies remain significant according to Mirova.

Sources: IMO, RUV, mbls, Univ. Iceland, Mirova

The eruptive site seen from the Icelandair flight Amsterdam- Keflavik on 04.27.2021- photo via Veðurstofa Íslands - Geldingadalur on the left, Meradalur in the background on the right, the active flow has branched off in the direction of the "Nameless Valley"

The eruptive site seen from the Icelandair flight Amsterdam- Keflavik on 04.27.2021- photo via Veðurstofa Íslands - Geldingadalur on the left, Meradalur in the background on the right, the active flow has branched off in the direction of the "Nameless Valley"

Eruptive site map, with the position of the vents and webcams - by Ragnar Heiðar Þrastarson - mapmaker and GIS Coordinator of The Icelandic Met Office - updated 04/28/2021 - one click to enlarge

Eruptive site map, with the position of the vents and webcams - by Ragnar Heiðar Þrastarson - mapmaker and GIS Coordinator of The Icelandic Met Office - updated 04/28/2021 - one click to enlarge

Reykjanes Peninsula - thermal anomalies at 04/29/2021 / 03:50 - Doc. Krisuvik / Mirova_MODIS_Latest10NTI

Reykjanes Peninsula - thermal anomalies at 04/29/2021 / 03:50 - Doc. Krisuvik / Mirova_MODIS_Latest10NTI

Reykjanes Peninsula - the parameters of the eruption as of 04/26/2021 / 1:30 p.m. - Doc. Jarðvísindastofnun Háskólans

Reykjanes Peninsula - the parameters of the eruption as of 04/26/2021 / 1:30 p.m. - Doc. Jarðvísindastofnun Háskólans

During the week of April 19 to 25, 2021, the eruptive activity of Sabancaya was maintained at moderate levels, with the occurrence of an average of 90 daily explosions accompanied by plumes of gas and ash reaching up to 2,000 m high above the summit.

At the seismic level, 1659 earthquakes of volcanic origin have been counted, associated with the circulation of internal fluids. Eleven thermal anomalies, with a VRP max. of 32 MW, in relation to the presence of a lava body in the crater. The other parameters do not present any significant anomalies, according to the IGP.

The alert level remains in Naranja

 

Source: I.G. Peru

Sabancaya - activity between 19 and 25.04.2021 - Doc. I.G. Peru

Sabancaya - activity between 19 and 25.04.2021 - Doc. I.G. Peru

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