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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
Etna SEC - 05.30.2021 / 04h00 -  INGV ECV webcam

Etna SEC - 05.30.2021 / 04h00 - INGV ECV webcam

At Etna, from 03:45 UTC on May 30, 201, we observe the resumption of Strombolian activity at the Southeast crater.


From around 01:10 UTC, there is a gradual increase in the average amplitude of the volcanic tremor whose values ​​reached high levels around 03:30 UTC. The volcanic tremor source centroid is located in the southeastern crater region at an altitude of about 2900 m s.l.m.
From around 03:40 UTC, an increase in infrasound activity is observed.
Analysis of soil deformation data shows the onset of a very weak disturbance at some stations of the clinometric network around 03:30 UTC

Etna SEC - Fountaining le 30.05.2021 / 05h47 - webcam INGV Emot0115

Etna SEC - Fountaining le 30.05.2021 / 05h47 - webcam INGV Emot0115

The INGV announces, at 04:40 UTC, that a lava fountain is in progress at the level of the Southeast crater. According to the forecast model, the eruptive cloud produced by the current activity is dispersing towards the SE.
The amplitude of the volcanic tremor has reached very high levels and, at the same time, the appearance of an infrasonic tremor is observed, both located in the Southeast crater.
The analysis of the deformations of the ground shows, from 04:00, an increase in the disturbance of the clinometric signals.

 

Source; INGV OE

Etna - trémor at 05.30.2021 / 07h - Doc. INGV - one click to enlarge

Etna - trémor at 05.30.2021 / 07h - Doc. INGV - one click to enlarge

In Nevado del Ruiz, Colombia, low temperatures have dominated the region's meteorology in recent weeks; significant snow loads are observed at altitudes above 4800 m altitude.

The volcanic summit was, at the time of the capture on May 28, almost completely clear, with greater cloudiness towards the north of the volcanic building, but allowing the visualization of the volcanic plume in all its splendor, lying to the north by the action of the wind, about 2,500 m before merging with the clouds.
 

Nevado del Ruiz - the Arenas crater on 05.28.2021 - photo SGC

Due to the whitish coloration of the emission column, a composition significant of water vapor is highlighted, without excluding the presence of aerosols and ash in suspension accompanying the volcanic gases.
The volcanic emissions themselves did not allow, at the time of capture (7:46 am), the observation of the bottom of the Arenas crater; however, after treatment, a close-up image of the crater area reveals emission sources mainly localized towards the eastern part of the crater floor.

 

Source: SGC - link

Nevado del Ruiz - 05.28.2021 - photo SGC

Nevado del Ruiz - 05.28.2021 - photo SGC

The eruption of Fagradalsfall continues, somewhat obscured by the bad weather conditions.

After more than 2 laws of eruption, the lava covers more than 2 km², and always causes fires in the vegetation. According to the Icelandic Institute of Natural History, around 31 hectares were burnt down.

Geldingadalur / vent # 5 - Five minute overview camera timelapse from May 28 at midnight - Doc. mblsau May 29, 2021 at midnight.

The eruption of Fagradalsfjall continues - photo Kristin Jonsdottir - - one click to enlarge

The eruption of Fagradalsfjall continues - photo Kristin Jonsdottir - - one click to enlarge

A photo of the eruptive site from the North Atlantic on May 29, 2021: in the background in the center, the lava fountain in Geldingadalur, and further to the right, the S formed by the lava in the Nátthaga valley - Photo journalist Brian Emfinger via Oroapuls

A photo of the eruptive site from the North Atlantic on May 29, 2021: in the background in the center, the lava fountain in Geldingadalur, and further to the right, the S formed by the lava in the Nátthaga valley - Photo journalist Brian Emfinger via Oroapuls

The options for defending the road below the lava flows will be developed this week; the experts work on the design of the structures and the cost analysis.

Sources: RUV & mbls

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