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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

A flow of considerable dimensions descends the southern slope of the volcano La Palma, in the central area of ​​Corazoncillo, before the district of San Nicolas in Las Manchas. During the night, it traveled many meters fed by the south-eastern mouth of Cumbre Vieja which, until yesterday, had emitted only pyroclasts. On October 23 afternoon, it began to release significant amounts of lava, viscous, without great speed, but forming an unstoppable incandescent wall, which has already traveled several meters to besiege the area where the houses are located. This area remained at the limit of the primordial flow, and it is here that the new flow, almost annexed, now passes towards the said population center, where there is also a photovoltaic plant and, below, the cemetery of Las Manchas, still in the region of Los Llanos de Aridane.

La Palma / Cumbre Vieja - Photo Involcan 24.10.2021 / 08:45

La Palma / Cumbre Vieja - Photo Involcan 24.10.2021 / 08:45

La Palma / Cumbre Vieja - new south flow / Las Manchas area - photo 24.10.2021 / IGME

La Palma / Cumbre Vieja - new south flow / Las Manchas area - photo 24.10.2021 / IGME

La Palma / Cumbre Vieja - ash at the top and flows at the base of the cone - photo 24.10.2021 / ~ 19h / Itahiza

La Palma / Cumbre Vieja - ash at the top and flows at the base of the cone - photo 24.10.2021 / ~ 19h / Itahiza

A new mouth opened in the lower part of the secondary cone of the Cumbre Vieja volcano on October 24 around 8 p.m., from which abundant lava flows. A landslide is envisaged in the western part of the secondary cone.

The rest of the flows maintain their lava charge, fed by lava tunnels.

An increase in intermediate and deep seismicity is observed, with increasing magnitudes in the intermediate zone.

La Palma / Cumbre Vieja - 24.10.2021 in the evening - photo Volcanes de Canarias

La Palma / Cumbre Vieja - 24.10.2021 in the evening - photo Volcanes de Canarias

La Palma / Cumbre Vieja - 24.10.2021 / around 8 p.m. - A new mouth has opened in the lower part of the secondary cone of the Cumbre Vieja volcano - photo GEVolcan

La Palma / Cumbre Vieja - 24.10.2021 / around 8 p.m. - A new mouth has opened in the lower part of the secondary cone of the Cumbre Vieja volcano - photo GEVolcan

As of October 24, 2021 at 07:14 UTC, Copernicus reports that the extent of the lava flows has reached 901.2 ha. (+9.3 ha in 24 hours due to the new southern flow). The number of buildings destroyed amounts to 2,146.

What is the total amount of seismic energy released by earthquakes in La Palma?
Since September 11, earthquakes located under the Cumbre Vieja volcano have released an amount of energy equivalent to 500 tonnes of TNT. All the energy released by these earthquakes would be equal to that of a single magnitude 5 earthquake.

 

Sources: IGNes, InVolcan, Copernicus

La Palma / Cumbre Vieja - sunk at 24.10.2021 / 07:14 UTC - Copericus EMSR - one click to enlarge

La Palma / Cumbre Vieja - sunk at 24.10.2021 / 07:14 UTC - Copericus EMSR - one click to enlarge

La Palma / Cumbre Vieja - the local magnitudes (Ml, Richter scale) of earthquakes recorded by the Canary Seismic Network managed by the Volcanic Institute of the Canary Islands (INVOLCAN) and the cumulative seismic energy curve, colored in red, expressed in tonnes of TNT. The blue bar indicates the start of the eruption. - one click to enlarge

La Palma / Cumbre Vieja - the local magnitudes (Ml, Richter scale) of earthquakes recorded by the Canary Seismic Network managed by the Volcanic Institute of the Canary Islands (INVOLCAN) and the cumulative seismic energy curve, colored in red, expressed in tonnes of TNT. The blue bar indicates the start of the eruption. - one click to enlarge

Between October 15, 2021 at 4 p.m. (UTC) and October 22, 2021 at 4 p.m. (UTC), the OVSM recorded at Montagne Pelée, Martinique, at least 44 volcano-tectonic earthquakes, associated with the formation micro-fractures in the volcanic edifice, of magnitude less than or equal to 0.1.

These earthquakes were located inside the volcanic edifice between 1 km and 0.1 km below the surface. None of these earthquakes were felt by the population.

A degassing zone at sea was detected at shallow depth (between St Pierre and le Prêcheur). The IGP is currently setting up experiments to map this gas emanation zone, carry out physicochemical measurements of the fluids and samples of these fluids in order to understand the origin of this degassing and to assess its possible relationship. with the hydrothermal system of Mount Pelée. This kind of manifestation is frequent on active or not active underwater volcanic sites. The analyzes underway by the OVSM-IPGP will make it possible to determine the possible relationship of this underwater degassing with the activity of Mount Pelée recorded by the OVSM since 2019.

A main area of ​​heavily degraded vegetation is still observed on the southwest flank of Mount Pelée, between the upper Claire River and the Chaude River.

The alert level remains at  YELLOW / vigilance.

 

Source: OVSM / IPGP.

Mount Pelée and the Volcanological and Seismological Observatory of Martinique, - photo OVSM

Mount Pelée and the Volcanological and Seismological Observatory of Martinique, - photo OVSM

In the Krasnodar Territory, the mud volcano Shugo, located in the region of the Kuban village of Varenikovskaya, Crimea, erupted.

The first confirmed signs of volcanic activity appeared on social networks on the morning of Wednesday, October 20, 2021

Right now there are some very powerful emissions. The mud dumping dome reaches 50 meters in diameter. The masses of mud, which are spat out by the volcano, disperse at a distance of 30 meters. The frequency of activity of a mud volcano depends on the tectonic movements of the earth's crust, the dynamics of the pressure of gases in the vent of the volcano. It could also be affected by a weak earthquake that happened somewhere nearby or by changes in the weather: recently there have been heavy rains, there have been large fluctuations in temperature.

The sludge disposal area has a diameter of approximately 230 m. The western area has been dug into swimming pools.

 

Source: Mark Tingay

Shugo / Varenikovskaya mud volcano, Crimea - Watch on You Tube

Shugo mud volcano - sat. Maxar tech. and location NE of the Black Sea - one click to enlargeShugo mud volcano - sat. Maxar tech. and location NE of the Black Sea - one click to enlarge

Shugo mud volcano - sat. Maxar tech. and location NE of the Black Sea - one click to enlarge

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