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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
 White island - photo GeoNet

White island - photo GeoNet

Recent aerial surveillance from Whakaari / White Island shows high temperatures of 498 to 654 ° C near the lava domes that formed in December 2019 ... an increase from the 110 ° C measured in May-June.

The volcano continues to produce a plume of gas and vapor, which continues to cause acid rain downwind.

The high temperature magmatic gases again reach the surface vents. The mechanism causing these changes is not identified with certainty: either the magma is involved in these subterranean movements towards the surface, or they come from gases released by a stationary body of magma.

Short-lived tremor and volcanic earthquakes have also been recorded.

The volcanic alert level remains at 1, associated with dangerous phenomena (discharge of steam and hot volcanic gases, earthquakes, landslides, and hydrothermal activity). Rashes can occur with little or no warning signs.

 

Source: GeoNet

Taal - steam and gas plume - photo archives CNNPH Philippines Army / Marcello Teofilo

Taal - steam and gas plume - photo archives CNNPH Philippines Army / Marcello Teofilo

In the last 24 hours, the Taal Volcano Network has recorded 10 volcanic earthquakes, including 3 lasting 2-3 minutes, six 6 low frequency earthquakes, and low intensity background tremor persisting since July 7, 2021. .

High levels of volcanic sulfur dioxide emissions and vapor-rich plumes that rose 900 meters before drifting east and northeast were generated by the Taal Main Crater.

Sulfur dioxide emissions average 5,286 tonnes / day on July 20, 2021.

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


Alert level 3 (magmatic disturbances) now prevails over the Taal volcano. At Alert Level 3, magma exiting the main crater could cause an explosive eruption.

 

Source: Phivolcs

Fagradalsfjall - the active cone and the lava flows on 20.07.2021 / 13:42 - webcam mbls

Fagradalsfjall - the active cone and the lava flows on 20.07.2021 / 13:42 - webcam mbls

Four months and a day have passed since the start of the volcanic eruption on the Reykjanes Peninsula. Scientists have been working for several days to measure the current character of the lava flow, as well as the growth and composition of the lava field.

The eruption has been irregular recently. Geophysicist Þorvaldur Þórðarson says it oscillates between phases of high and low activity and the activity of lava fountains changes about every five to seven minutes, with ten to fifteen minutes between periods of activity.

A drop of ten meters is still to be overcome by the lava before it overflows Meradalur, and resumes its route towards the sea.

We are awaiting the results of an observation and parameterization of the lava field.

 

Source: RUV

Fagradalsfjall - tremor at 21.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 21.07.2021 - Doc. Hraun.vedur.is

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