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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
  Fagradalsfjall active vent #5 - 29.06.2021 / 20h57 - Visir webcam - one click to enlarge

 Fagradalsfjall active vent #5 - 29.06.2021 / 20h57 - Visir webcam - one click to enlarge

  Fagradalsfjall active vent #5 - 29.06.2021 / 20h58 - Visir webcam - one click to enlarge

 Fagradalsfjall active vent #5 - 29.06.2021 / 20h58 - Visir webcam - one click to enlarge

Eruption of Fagradalsfjall

Difficult to interpret what is happening at the eruption site in Geldingadalur, where the seismic tremor dropped on June 28 and then picked up again.

A heavy fog is blocking the view of the crater and is expected to last until Friday. The stability of the atmosphere may prevent the eruptive plume from forming.

But on 29 June at 20:55, it was clear that there was still intense activity and plenty of lava. However, until verified on the ground, a new phase seems to be emerging.

 

Sources: mbls & Visir

Etna SEC - lava fountain and ash plume on 28.06.2021 - photo Gio Giusa

Etna SEC - lava fountain and ash plume on 28.06.2021 - photo Gio Giusa

Etna SEC - all the power of the volcano in this photo of 28.06.2021 - photo by Gio Giusa

Etna SEC - all the power of the volcano in this photo of 28.06.2021 - photo by Gio Giusa

With a slight delay, ... on 28 June at about 16:00 (14:01 UTC), strombolian activity at the South-East Crater of Etna resumed, passing to the lava fountain phase at about 17:00 (15:01 UTC).

This explosive activity was accompanied by two lava flows, one towards the SW and the other in the southwest of the South-East Crater.

In accordance with the predictive model, the eruptive column dispersed to the south-southeast, reaching a height of about 10 km s.l.m.

At about 17.30 hrs the lava fountain stopped.

 

Sources: INGV OE

Etna - tremor variations on 30.06.2021 / 06h - Doc. INGV OE

Etna - tremor variations on 30.06.2021 / 06h - Doc. INGV OE

The activity of Sabancaya remained at a moderate level during the week of 21-27 June 2021, with an average of 80 daily explosions, accompanied by plumes of ash and gas reaching up to 3,000 metres above the summit.

I.G.Peru has detected 1,102 earthquakes of volcanic origin associated with the circulation of internal magma fluids over this period. The VT earthquakes, related to rock fracturing, with magnitudes between 1.8 and 2.9, occurred mainly to the north and northeast of the volcano.

The deformation parameters do not show significant anomalies. Four thermal anomalies were recorded, with a maximum of 16 MW.

The volcanic alert remains at naranja, associated with the 12 km radius non-accessible area around the crater.

 

Source: I.G.Peru

Sabancaya - activity from 21 to 27.06.2021 - doc. I.G.Peru

Sabancaya - activity from 21 to 27.06.2021 - doc. I.G.Peru

 Sabancaya - thermal anomalies at 28.06.2021 / 15h07 - Sentinel-2 & MODIS thermal volcanic activity - Doc. Mirova

Sabancaya - thermal anomalies at 28.06.2021 / 15h07 - Sentinel-2 & MODIS thermal volcanic activity - Doc. Mirova

La Soufrière de St. Vincent volcano - Update of 29/06/21 13:00


Seismic activity at La Soufrière, St Vincent has remained low since the tremor associated with the April 22 explosion and ash discharge. Over the past 24 hours, only a few small earthquakes have been recorded.
Persistent steam emissions from some areas within the crater continue to be the dominant observable feature.
Thermal anomalies continue to be detected but do not indicate that an explosive event is imminent but that there is a source of heat, most likely from a small body of remaining magma near the floor of the summit crater.
Sulphur dioxide flux measurement was carried out by helicopter on 25 June and gave an average SO2 flux of 215 tonnes per day.

 

While volcanic activity is declining, the continued presence of hot spots near the surface, daily seismic activity and significant outgassing are evidence that the system is still active. There is a small but NOT INSIGNIFICANT possibility that escalation of activity may still occur with little or no warning.
The volcano is at ORANGE alert level.

 

Source: UWI-SRC

Soufrière de St. Vincent - the crater on 29.06.2021 and 29.03.2021 - photos UWI-SRC - click to enlarge
Soufrière de St. Vincent - the crater on 29.06.2021 and 29.03.2021 - photos UWI-SRC - click to enlarge

Soufrière de St. Vincent - the crater on 29.06.2021 and 29.03.2021 - photos UWI-SRC - click to enlarge

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