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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

In recent days, the recording of seismic signals (volcanic tremor pulses and long-lasting earthquakes) associated with small ash emissions has continued at Nevado del Ruiz.

Some of these emissions and the incandescence were visible thanks to the web cameras installed in the area of ​​the volcano.

A possible ash fall is not excluded in the towns of Letras, Herbeo, Casabianca, Villahermosa, Líbano and Murillo and other towns that are in the direction of the wind regime, which is currently mainly to the northeast.

A plume of water vapor and gas is observed this 10 October 2021 in the morning, thanks to the webcams of the SGC - Manizales. The gas column reached a maximum height of 1,050 m with a northeast direction of dispersion.

The level of activity of the Nevado del Ruiz volcano continues at 3 / yellow / changes in the behavior of volcanic activity.

 

Source: SGC - Manizales

Nevado del Ruiz - 10.10.2021 - ash emissions and night glow on SGC webcams.

Nevado del Ruiz - 10.10.2021 - ash emissions and night glow on SGC webcams.

Lava continues to arrive in the crater of Nyiragongo.

The thermal anomalies of October 08 - 10 taken by Sentinel-2 and Mirova indicate that the strong activity continues.

 

Sources : Sentinel-2 and Mirova

Nyiragongo - Sentinel-2 bands image 12,11,8A from 08.10.2021 / 08:08 via Mounts pProject

Nyiragongo - Sentinel-2 bands image 12,11,8A from 08.10.2021 / 08:08 via Mounts pProject

Nyiragongo- thermal anomalies at 10.10.2021 / 11:30 p.m. - Doc. _MODIS_Latest10NTI

Nyiragongo- thermal anomalies at 10.10.2021 / 11:30 p.m. - Doc. _MODIS_Latest10NTI

In Kilauea, it seemed obvious that the newly formed Halema'uma'u lava lake would continue to rise and eventually cover all of the remaining topography from the previous eruption.

However, as the eruption progressed, the height of the large island above the surface of the lava lake began to increase. Islands that geologists have seen being submerged in new lava have also started to reappear.
It is not known why these islands - or rafts - which were only a few days ago submerged by the lava lake have reappeared. All of these islands appear to be stationary, except for the fact that they float vertically upward, so it's likely that all or large chunks of the older lava lake bottom are moving upward together.

Similar behavior of the lava lake was observed by Thomas A. Jaggar, founder of the HVO, about a century ago.

Since the morning of October 10, 2021, lava continues to emerge from a single vent in the western wall of Halema'uma'u crater. All lava activity is confined to the Halema'uma'u crater. Seismicity and volcanic gas emission rates remain high.

 

Source: HVO-USGS

Kilauea / Halema'uma'u - Bird's eye view of the eruption of the lava lake Halema'uma'u, September 29 and October 4, 2021 from the F1 thermal camera located on the western edge of the crater at the top of Kīlauea. - vertical trip of the lava islands - Doc. USGS - HVO

Kilauea / Halema'uma'u - Bird's eye view of the eruption of the lava lake Halema'uma'u, September 29 and October 4, 2021 from the F1 thermal camera located on the western edge of the crater at the top of Kīlauea. - vertical trip of the lava islands - Doc. USGS - HVO

Kilauea / Halema'uma'u crater - one active vent as of 08.10.2021 - USGS photo

Kilauea / Halema'uma'u crater - one active vent as of 08.10.2021 - USGS photo

The eruptive activity of Cumbre Vieja continues on La Palma.
Since October 8 at 2 p.m. UTC, 214 earthquakes have been located in the area affected by the volcanic reactivation of Cumbre Vieja, 19 of these earthquakes have been felt by the population, the maximum intensity being in the epicentral zone IV (EMS98), during an earthquake that occurred at 20:54 UTC on the 9th, with a magnitude of 3.6 (mbLg) at a depth of 11 km.
The highest magnitude earthquake occurred at 11:55 p.m. on the 8th, with a value of 4.2 mbLg at a depth of 38 km.

 

The average amplitude of the volcanic tremor remains stable within a range of average values ​​compared to the observations measured during this eruption. No intensification pulse has been recorded since the last report.

La Palma / Cumbre Vieja - earthquakes at 11.10.2021 / 6:06 am - Doc. IGNes

La Palma / Cumbre Vieja - earthquakes at 11.10.2021 / 6:06 am - Doc. IGNes

The constant effusive activity has increased the northern lava flows, which continue their descent towards the region of Todoque in two arms. The south arm united with the previous flow, while the north arm affects the industrial polygon of Los Lanos de Aridane.

The surfaces affected by the lava reach more than 527 ha., of which 132 ha. cultivable areas; 1,281 buildings are affected according to Copernicus.

On the image of Sentinel-2 of October 10, we see a flow arm to the north and a flow with some incandescences to the south of the Montana de Todoque.

La Palma / Cumbre Vieja - 10.10.2021 - flows N & S of Montana Todoque - Sentinel-2 bands 12,11,8A / Copernicus
La Palma / Cumbre Vieja - 10.10.2021 - flows N & S of Montana Todoque - Sentinel-2 bands 12,11,8A / Copernicus

La Palma / Cumbre Vieja - 10.10.2021 - flows N & S of Montana Todoque - Sentinel-2 bands 12,11,8A / Copernicus

La Palma / Cumbre Vieja - 10.10.2021 - flows N & S of Montana de Todoque - Copernicus map

La Palma / Cumbre Vieja - 10.10.2021 - flows N & S of Montana de Todoque - Copernicus map

La Palma - thermal anomalies at 10.10.2021 / 03:35 - Mirova_MODIS_logVRP

La Palma - thermal anomalies at 10.10.2021 / 03:35 - Mirova_MODIS_logVRP

La Palma / Cumbre Vieja - 09.10.2021 - huge boulders float in the lava flow - IGME-CSIC video - https://www.youtube.com/watch?v=faKHOmCdrX8

The height of the eruptive column, measured at 6.30 UTC, is 3,500 m., Slightly lower.

At 19:42 an emission of ash in the upper part of the mouth, Strombolian for the intermediate and Hawaiian for the lower part, are observed by Volcanes de Canarias. The explosions remain moderate.

Tropomi detected a strong SO2 signal at a distance of 12.1 km from Cumbre Vieja, with 200.04 DU of SO2 at an altitude of ~ 1km. Estimated mass within a radius of 300 km: 78.9 kts.

The island's network of permanent GNSS stations shows stability in the deformations of stations close to eruptive centers.

Defense Minister Margarita Robles has announced that the Armada will join the ash clean-up teams on Monday.

 

Source: IGNes, IGME, DSN, RTVC, Canarias volcanoes, Copernicus.

La Palma / Cumbre Vieja - 10.10.2021 - photo Volcanes de Canarias

La Palma / Cumbre Vieja - 10.10.2021 - photo Volcanes de Canarias

La Palma / Cumbre Vieja - strong SO2 signal at a distance of 12.1 km from Cumbre Vieja, with 200.04 DU of SO2 at an altitude of ~ 1km. - Image Sentinel-5P Tropomi / DKR / BIRA / ESA

La Palma / Cumbre Vieja - strong SO2 signal at a distance of 12.1 km from Cumbre Vieja, with 200.04 DU of SO2 at an altitude of ~ 1km. - Image Sentinel-5P Tropomi / DKR / BIRA / ESA

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