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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 eruption: stop or go ?

After a sudden drop in the tremor on July 2 at around 1 a.m., no incandescent lava is now visible in the crater in Geldingadalur.

Is the volcano taking a break, or is the eruption over?

Fagradalsfjall - flight over vent # 5 where no activity is visible - photo Visit Reykjanes via Kristín Jónsdóttir / ~3pm

Fagradalsfjall - flight over vent # 5 where no activity is visible - photo Visit Reykjanes via Kristín Jónsdóttir / ~3pm

Fagradalsfjall - helicopter flight over the eruptive site - photo Gisli Olafsson 02.07.2021 / online around 4 p.m.

Fagradalsfjall - helicopter flight over the eruptive site - photo Gisli Olafsson 02.07.2021 / online around 4 p.m.

An overview of the active vent in Geldingadalur by Gisli Olafsson shows that the crater has emptied and that no trace of incandescent lava is visible.

The Coast Guard helicopter passes a little later and notices that lava has returned ... a rise of the tremor around 4 p.m. marks the return to business of the volcano, and around 7 p.m., a spattering is visible at the vent # 5.

2021.07.02 Fagradalsfjall - some lava in the crater on 02.07.2021 - photo Coast Guards via mbls

2021.07.02 Fagradalsfjall - some lava in the crater on 02.07.2021 - photo Coast Guards via mbls

Fagradalsfjall - 02.07.2021 - after a steep fall, the tremor started to rise again - Doc. Kristín Jónsdóttir / IMO

Fagradalsfjall - 02.07.2021 - after a steep fall, the tremor started to rise again - Doc. Kristín Jónsdóttir / IMO

Fagradalsfjall vent # 5 - resumption of incandescence on 02.07.2021, at 6:57 p.m. and 7:02 p.m. respectively - Visir and RUV webcam - one click to enlargeFagradalsfjall vent # 5 - resumption of incandescence on 02.07.2021, at 6:57 p.m. and 7:02 p.m. respectively - Visir and RUV webcam - one click to enlarge

Fagradalsfjall vent # 5 - resumption of incandescence on 02.07.2021, at 6:57 p.m. and 7:02 p.m. respectively - Visir and RUV webcam - one click to enlarge

The flows resume towards Meradalur around 10 p.m. And they are still active this July 3 at the start of the day.

 

Sources: webcams of the volcano - and followed by Kristín Jónsdóttir and Gisli Olafsson

Meradalur - 02.07.2021 / 22h00 an active casting - webcam Veðurstofa Íslands

Meradalur - 02.07.2021 / 22h00 an active casting - webcam Veðurstofa Íslands

Fagradalsfjall - 03.07.2021 / 01:05 - webcam_slaga NNA

Fagradalsfjall - 03.07.2021 / 01:05 - webcam_slaga NNA

Fagradalsfjall - 03.07.2021 / 02h00 - webcam_langihryggur NV

Fagradalsfjall - 03.07.2021 / 02h00 - webcam_langihryggur NV

Fagradasfjall eruption - resume at the beginning of the video with the red cursor to see the resumption of the flows - mbls video

A series of three (3) short phreatomagmatic gusts occurred at 10:25 a.m., 10:47 a.m. and 11:01 a.m. on July 2, 2021, and produced short plumes rising 100 meters above the main crater lake of Taal. An active ascent of hot volcanic fluids from the main Taal crater lake followed in the afternoon.

In the last 24 hours, the Taal Volcano Network recorded forty-eight (48) volcanic earthquakes, including two (2) volcano-tectonic earthquakes, forty (40) low frequency volcanic earthquakes, six ( 6) volcanic earthquakes lasting up to four (4) minutes, and one low level earthquake that has persisted since April 8, 2021.

High levels of volcanic sulfur dioxide emissions are observed, as are vapor-rich plumes that reached up to three thousand (3,000) meters high that drifted southwest and north-north. west from the main Taal crater. Sulfur dioxide  emissions were on average 10,254 tonnes / day on July 2, 2021. In addition, vog was observed on the Taal volcano and its surroundings.

Based on ground deformation parameters from electronic tilt, continuous monitoring by GPS and InSAR, Taal Volcano Island began to deflate in April 2021 as the Taal region continues to undergo expansion. very slow since 2020.


This July 3, an active upwelling of hot volcanic fluids from the main crater lake of Taal is observed from 7.15 a.m. to 7.42 a.m. The generated plumes rose 2,400 meters above the crater and contributed to vog over the Taal Caldera area.

 

About 317 families or 1,282 people have been preventively evacuated due to phreatomagmatic eruptions, the National Council for Disaster Risk Reduction and Management reported yesterday.
The Ministry of Tourism has called on tourists and tour operators near the Taal volcano to evacuate. He also called for postponing non-essential activities and trips to high-risk cities until they are declared safe by authorities.
Malacañang called on residents living near the volcano to heed the call of local government units for evacuation and to take precautionary measures due to a possible eruption.

 

Alert level 3 (magmatic agitation) now prevails over the Taal volcano.

 

Sources: Phivolcs and Philippine Star

Taal - activity summary on 03.07.2021 - Doc. Phivolcs

Taal - activity summary on 03.07.2021 - Doc. Phivolcs

Several ash emissions were observed at the Reventador, in the morning of July 2, 2021, in a westerly and north-westerly direction, heights around 800 and 1000 meters above the crater level.

The Washington VAAC reported 2 warnings of emissions observed in satellites, its direction was maintained towards the west and the heights did not exceed 1000 meters above the level of the crater.

FIRMS reported 7 thermal alerts to Reventador in the last 24 hours

From the night and part of the morning of today the volcano appeared clear allowing to observe the described emissions and at night the incandescence in the crater and the rolling of incandescent material on the south-eastern and north-eastern flanks. east of the volcano.

The seismicity from 01 to 02.07.2021 / 11h is characterized by 53 explosion earthquakes, 42 LP earthquakes, 6 emission tremor episodes and one harmonic tremor

Alert: naranja - Level of superficial activity: high - and internal activity: moderate

 

Source: IGEPN

 Reventador - 07/02/2021 / 12:30 p.m. - ash plume - IGEPN webcam

 Reventador - 07/02/2021 / 12:30 p.m. - ash plume - IGEPN webcam

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