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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
La Palma / Cumbre Vieja - 18.11.2021 / 08h loc. - photoInvolcan

La Palma / Cumbre Vieja - 18.11.2021 / 08h loc. - photoInvolcan

Seismicity in general has increased enormously in La Palma, especially at intermediate depths between 10 and 15 km. The record was broken, according to IGN, by 300 earthquakes on November 18 in the past 24 hours. The maximum recorded until yesterday was last October 24 with 271 earthquakes. The largest earthquake is M5 at 37 km. depth.
Everything indicates how much more magma is rising to the surface. The last two weeks were characterized mainly by the large amount of lava emitted, the apparent stability of the eruptive activity, large plumes of ash and gas and the reduction of parameters in general.

La Palma - seismicity at 19.11.2021 / 07h20 - Doc. IGN

La Palma - seismicity at 19.11.2021 / 07h20 - Doc. IGN

La Palma / Cumbre Vieja - IGME fieldwork -photo 18.11.2021

La Palma / Cumbre Vieja - IGME fieldwork -photo 18.11.2021

At around 10:45 UTC, due to the height increase of the eruptive column, the IGN issued a new VONA, informing of the maximum height of the eruptive column at 3,500 m. asl.


A lava lake has formed above the point where the lava flows emerge; part of the cone collapsed and lava cascaded down on November 18 in the evening, lasting about an hour.

The lava affects other surfaces between las montañas de Todoque and La Laguna.

La Palma / Cumbre Vieja - lava flow in the plantations - 18.11.2021 - via DSN

La Palma / Cumbre Vieja - lava flow in the plantations - 18.11.2021 - via DSN

La Palma / Cumbre Vieja - after the partial collapse of the cone, lava cascades on 11/18/2021 / 8:43 p.m. - Video extract from Canarias TV

La Palma / Cumbre Vieja - after the partial collapse of the cone, lava cascades on 11/18/2021 / 8:43 p.m. - Video extract from Canarias TV

The Cumbre Vieja volcano released into the atmosphere in two months of activity as much sulfur dioxide as that emitted by human activity in the 28 countries of the European Union throughout 2019, according to the calculation made by two scientific institutions that monitor the gases that the eruption expels into the atmosphere, the Canary Islands Volcanological Institute and the University of Manchester (United Kingdom), with special monitoring of SO2.

 

According to Juan Carlos Carracedo, volcanologist and professor of CSIC, the volcano of La Palma has considerably reduced its capacity to do damage. He estimates that it will last "a few more weeks, but the seismicity may continue for months" after the eruption ends ... "There is general agreement that he is showing signs of weakness, because that the main parameters that indicate the strength of the volcano, to put it that way, are all in gradual decline, albeit with some rebound, ”he said.

 

Sources: IGN, IGME, DSN, Copernicus, El Pais

Taal - activity on 19.11.2021 / 05h - Doc. Phivolcs

Taal - activity on 19.11.2021 / 05h - Doc. Phivolcs

In the past 24 hours, the Taal Volcano monitoring network has not detected any volcanic earthquakes, but a low-level background tremor has persisted since July 7, 2021.

The activity of the main crater was dominated by the rise of hot volcanic fluids in its lake which generated plumes 2,500 meters high that drifted southwest. Sulfur dioxide emissions averaged 8,733 tonnes / day on November 18, 2021.

Based on ground deformation parameters from electronic tilt, continuous GPS, and InSAR monitoring, Taal Volcano Island has been inflating since August 2021 while the Taal region continues to experience very slow expansion. since 2020.
Alert level 2 (increased unrest) prevails over the Taal volcano. DOST-PHIVOLCS reminds the public that at Alert Level 2, sudden explosions of steam or gas, volcanic earthquakes, minor ash falls and fatal accumulations or expulsions of volcanic gas can occur and threaten the areas in and around TVI.

 

Source: Phivolcs

Taal - image Sentinel-2 bands 12,11,8A on 11/18/2021 / 02:20 am - via Mounts Project

Taal - image Sentinel-2 bands 12,11,8A on 11/18/2021 / 02:20 am - via Mounts Project

Taal - Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity on 18.11.2021 / 02:33 - Doc. Mirova

Taal - Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity on 18.11.2021 / 02:33 - Doc. Mirova

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