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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

Over the past 18 months, the Fernandina volcano, located in the Galapagos archipelago, has undergone a slow deformation process that has become more pronounced in recent weeks. The other monitoring parameters (seismicity, surface activity) show no change and remain at low levels.

Since the peak of the last eruption on January 13, 2020, no thermal anomaly or emission of gas or ash has been detected in the volcano thanks to the remote sensors available.

Fernandina - Map of deformation speeds obtained by InSAR, from Sentinel-1 images of the descending orbit of the Fernandina volcano, between February 03, 2020 and October 31, 2021. - Doc. IGEPN

Fernandina - Map of deformation speeds obtained by InSAR, from Sentinel-1 images of the descending orbit of the Fernandina volcano, between February 03, 2020 and October 31, 2021. - Doc. IGEPN

The areas shown in tha above figure, in red color, register positive displacements at a speed of ~ 400 mm / year in the satellite line-of-sight (LOS) study period. This positive shift is known as "inflation" "and it is observed at the caldera and the outer part of the caldera (NE). The sky blue zones represent a zone of negative deformation called “deflation” at speeds between -100 to -400 mm / year over the study period, and are located in the external zones around the caldera, in the SW zone. Finally, the green zones do not show any deformation (velocities of 0 cm / year).

Based on the deformation data and modeling, it is suggested that the magmatic material causing this deformation could be related to two sources: a surface source located about 2 km below the surface associated with a volume of 6.8 million m³ and a deep source located 4.5 km below the surface with a volume of 10.2 million m³.

Fernandina - Diagram of the origin of the deformation recorded in the Fernandina volcano (based and modified from Geist D. et al, 2006). - IGEPN

At present, the Fernandina volcano presents a notable deformation within the caldera (inflation) and on its southwest flank (deflation which turned into inflation in October 2021), which could be the premonitory of a future eruptive activity in the medium-long term (weeks to years). There are no human settlements on Fernandina Island and in the event of a new eruption, the local flora and fauna could be affected. The IG-EPN recommends keeping informed of the activity of the Fernandina volcano through official sources.

 

Source: IGEPN

Nevado del Ruiz - cleaning of monitoring stations by SGC teams on 11.10.2021 - source SGC

Nevado del Ruiz - cleaning of monitoring stations by SGC teams on 11.10.2021 - source SGC

On November 9, 10 and 11, 2021, officials of the Colombian Geological Service who work at their headquarters of the Volcanological and Seismological Observatory of Manizales visited the Nevado del Ruiz volcano with the aim of carrying out preventive corrective maintenance and emergency in some of its volcanic monitoring stations which have been affected by recent ash emissions.
The ashes deposited on the stations cause the shutdown of certain mechanical components of the monitoring equipment, but above all, they prevent the solar panels of the stations from supplying the energy necessary for the operation of the entire station.
As a result of the work carried out, it was possible to recover the telemetry communication with 6 volcanic monitoring stations, which provide real-time data on seismicity, soil deformation and gas emissions from the Nevado del Ruiz

 

The activity continues, with the emission of ashes on November 13, 2021 at 6:21 am - Camera of the Cisne sector. The column of gas and ash was gray in color and reached a maximum height of 2000 m with a northeast direction of dispersion.
The activity level remains at yellow or (III): changes in the behavior of volcanic activity.

 

Source: SGC

Karymsky - photo archive / Press Service of the Main Directorate of the Russian Emergency Ministry for the Territory of Kamchatka

Karymsky - photo archive / Press Service of the Main Directorate of the Russian Emergency Ministry for the Territory of Kamchatka

Karymsky's eruptive activity continues. Satellite data showed that explosions sent ash up to 7.2 km altitude and a 28x13 km ash cloud drifted 22 km northeast of the volcano.

Moderate eruptive activity of the volcano continues. Ash explosions up to 10 km (32,800 feet) altitude. could occur at any time, and affect international and low-flying aircraft.

The aviation code remains orange.

 

Source: KVERT

La Palma - eruptive site on 13.11.2021 / 19:30 loc. - photo InVolcan

La Palma - eruptive site on 13.11.2021 / 19:30 loc. - photo InVolcan

La Palma - arrival of the lava at sea on 13.11.2021 - @martydelapalma via DSN

La Palma - arrival of the lava at sea on 13.11.2021 - @martydelapalma via DSN

In La Palma, concerning the evolution of the eruptive process, the new lava delta which flows into Los Guirres beach continues to grow with lava inputs, while the rest of the Cumbre Vieja flows remain stable.

Dead fish appear due to "ingestion of ashes", with the sea at over 50ºC near the fajana.

The area affected by the volcanic eruption now reaches 1,018.67 hectares. Intermediate seismicity (between 10 and 15 km) continues at low values, consolidating the evolution recorded in recent days, and deep seismicity (from 20 km) remains constant. Weather conditions favor the operation of airports and the dispersion of pollutants.

PEVOLCA reiterates the importance of respecting security measures when access to exclusion zones is authorized.

La Palma - Thermal anomalies at 11.14.2021 / 02:25 - Doc.Mirova_MODIS_logVRP

La Palma - Thermal anomalies at 11.14.2021 / 02:25 - Doc.Mirova_MODIS_logVRP

La Palma - Seismicity at 14.11.2021 / 07:10 - Doc. IGN

La Palma - Seismicity at 14.11.2021 / 07:10 - Doc. IGN

We deplore the death of a 72-year-old resident of El Paso, whose roof fell on him while he was in the exclusion zone, according to initial indications, although the circumstances of the death still apply under investigation.
The victim entered the exclusion zone this Friday with the usual convoy of workers and volunteers who go daily to cleaning the houses, under institutional authorization. The family reported his disappearance on Friday and it was Saturday morning that his body was found.

 

Sources: IGN, InVolcan. DSN, Coernicus, Volcanes y ciencia Hoy

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