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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 - A small lava lake has taken place inside the upstream eruptive vent - overview of 03.05.2021 - Doc. OVPF / SAG / PGHM

Piton de La Fournaise - A small lava lake has taken place inside the upstream eruptive vent - overview of 03.05.2021 - Doc. OVPF / SAG / PGHM

The eruption that began at Piton de La Fournaise on 04/09/2021 at 7 p.m. (appearance of the tremor) continues. The amplitude of the tremor after having stagnated from April 29 to May 1, resumed its tendency to slowly decrease since May 2. However, its amplitude remains significant, still reaching 50% of the maximum amplitude observed during this eruption on April 13.

Over the past 24 hours, 6 superficial volcano-tectonic earthquakes (between sea level and the surface) have been recorded, all located directly above the summit craters.

The CO2 fluxes in the soil are always increasing in the far field (Plains region). The slight inflation (swelling) of the summit area and the base of the terminal cone is confirmed. This parameter will be carefully monitored over the next few days because it may correspond to the pressurization of the superficial magmatic reservoir located under the summit and could suggest a deep magma flow entering the upper superficial magmatic reservoir adding to the outlet flow of the reservoir which feeds the eruptive site.

The improvement in weather conditions on site since yesterday has continued, making it possible to observe the eruption from Piton de Bert and more generally from the southern rampart of Enclos Fouqué.

Piton de La Fournaise - 03.05.2021 - eruptive vents and fumaroles on the lava tunnel field - Doc. OVPF

Piton de La Fournaise - 03.05.2021 - eruptive vents and fumaroles on the lava tunnel field - Doc. OVPF

Piton de La Fournaise - interventions (sometimes acrobatic) on the Piton de la Fournaise massif for the OVPF-IPGP teams on May 3, 2021, for the repair of a station, the sampling of the flow and the last readings , with the support of SAG / PGHM

Piton de La Fournaise - interventions (sometimes acrobatic) on the Piton de la Fournaise massif for the OVPF-IPGP teams on May 3, 2021, for the repair of a station, the sampling of the flow and the last readings , with the support of SAG / PGHM

An intervention carried out this morning with the support of the SAG and the PGHM, allowed us to observe that the flow front was still located upstream of the Bonnet crater and that it had resumed a slow progression downstream, to achieve lava samples, and to put a broken down seismic station back into operation.

The flow of lava at the exit of the eruptive vents is mainly tunneled and almost to the upper limit of the large slopes. The lava is visible from the RN2.

The lava fountains, clearly visible until the beginning of the bad weather period, are now much weaker. A small lava lake has taken place inside the upstream eruptive vent, while the gas plume concentrates on the downstream vent.

The favorable weather conditions allowed an estimation of the lava flow by satellite imagery. Surface flows estimated from satellite data via the HOTVOLC platform (OPGC - Clermont Auvergne University) remain below 7 m³ / s. However, the lava flow, now largely tunneled, probably leads to an underestimation of this flow.

Note, this morning as yesterday morning, the presence of fires in the vegetation located at the foot of the nose cut of Tremblet.

 

Source: OVPF

Sabancaya - activity from 26.04 to 02.05.2021 - Doc. I.G. Peru

Sabancaya - activity from 26.04 to 02.05.2021 - Doc. I.G. Peru

I.G.Peru informs us of a moderate level of activity in Sabancaya for the period from April 26 to May 2, 2021. It is characterized by an average of 91 daily explosions, accompanied by plumes of gas and ash reaching 2,300 meters above Summit.

During the period, 1,703 earthquakes of volcanic origin associated with the circulation of internal fluids. VT earthquakes, related to rock fracturing, are detected mainly to the east and northwest of the volcano, with a magnitude between 1.4 and 2.5.

At the deformation level, no significant anomalies, apart from a slight inflation in the northern sector.

Eleven thermal anomalies are identified, with a max. of VRP 42 MW.

Lahars are possible between May 5 and 7 following the forecast precipitation.

The alert level remains at Naranja, with its 12 km exclusion zone. radius.

 

Source: I.G. Peru

Sabancaya - Sentinel2 bands 12,11,8A and Mirova Modis thermal volcanic activity on 04.29.2021

Sabancaya - Sentinel2 bands 12,11,8A and Mirova Modis thermal volcanic activity on 04.29.2021

Sabancaya - Sentinel-2 bands 12,11,8A on 24.04.2021 - latest via mounts project

Sabancaya - Sentinel-2 bands 12,11,8A on 24.04.2021 - latest via mounts project

On the morning of Monday, May 3, clearings in the existing cloudiness on the Nevados de Chillan Volcanic Complex made it possible to observe the eruptive activity, through the volcanic surveillance cameras of Sernageomin.

Nevados de Chillan - 03.05.2021 - webcam Sernageomin


The activity is characterized by explosions and persistent ash emissions, very similar to what was observed during much of the 2016-2021 eruptive cycle. The observations come after Sernageomin released a series of Special Volcanic Activity Reports (REAVs) yesterday, representing a series of seismic events related to the movement of fluids in the system.

The agency maintains the yellow technical alert.

 

Source: Sernageomin via Volcanes in Chile

Fagradalsfjall volcanic eruption 03.05.2021 - The 3D models of the Institute of Natural History are based on photographs taken from an airplane and processed by the institute's imaging team. The project is carried out in collaboration with Civil Defense, the National Land Survey of Iceland and the University of Iceland.

Fagradalsfjall volcanic eruption 03.05.2021 - The 3D models of the Institute of Natural History are based on photographs taken from an airplane and processed by the institute's imaging team. The project is carried out in collaboration with Civil Defense, the National Land Survey of Iceland and the University of Iceland.

The current eruptive phase of Fagradalsfjall, characterized by stops of about 3 minutes, then a sharp increase with jets higher than before (about up to 300 m. In height), which lasts about 10 minutes, continues. The lava fountains are visible from the coast.

Note that the flow towards Meradalur has joined the flows in place (see 3D model above.

The thermal anomalies observed by Mirova remain very high.

 

Sources: IMO, RUV, webcam langihryggur N, Institute of Natural History.

Geldingadalur - the eruptive site / vent 5 - webcam_langihryggur N on 03.05.2021, at 11:10 a.m. and 8:50 p.m. respectively.
Geldingadalur - the eruptive site / vent 5 - webcam_langihryggur N on 03.05.2021, at 11:10 a.m. and 8:50 p.m. respectively.

Geldingadalur - the eruptive site / vent 5 - webcam_langihryggur N on 03.05.2021, at 11:10 a.m. and 8:50 p.m. respectively.

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