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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
Sangay - Left: photograph taken during the flyover on June 24, 2020. In yellow we see the southeast ravine and its maximum opening at the top. In addition, a small explosion can be observed, very characteristic of the continuous activity of the volcano since May 2019. Right: photo taken by ECU911 on October 18, 2021. - one click to enlarge

Sangay - Left: photograph taken during the flyover on June 24, 2020. In yellow we see the southeast ravine and its maximum opening at the top. In addition, a small explosion can be observed, very characteristic of the continuous activity of the volcano since May 2019. Right: photo taken by ECU911 on October 18, 2021. - one click to enlarge

Since May 6, 2019, the Sangay volcano, in Ecuador, has exhibited an eruptive activity classified from moderate to high, with almost continuous emissions of gas, ash, lava flows, pyroclastic flows and lahars. In recent weeks, the internal activity parameters of the volcano have shown an increase in the number of small explosions, as well as a slight inflationary trend on all sides of the volcano. On the other hand, the surface parameters show a continuous emission of lava flows (constant thermal anomalies) and slight changes in the morphology of the volcano. This type of activity is very common in the Sangay volcano, which maintains its internal and surface activity at levels considered high at the time of writing.

Do not approach the dangerous areas of the Sangay volcano. If you are in an ash fall area, protect yourself with a mask, goggles and limit your exposure. Stay informed of the evolution of eruptive activity on the site of the Geophysical Institute and on its social networks Twitter, Facebook and Telegram. Follow the recommendations of the risk management authorities (SNGRE and GAD).

 

Source: IGEPN

La Palma - map of the Cumbre vieja flows at 11.24.2021 / 10:15 a.m. - via Volcanes y ciencia hoy - one click to enlarge

La Palma - map of the Cumbre vieja flows at 11.24.2021 / 10:15 a.m. - via Volcanes y ciencia hoy - one click to enlarge

This November 25, La Palma rises with only 5 earthquakes, 4 of which are deep. The tremor signal remains surprisingly stable at very low values. These signals are compatible with a lower energy stage.

The Strombolian activity of Cumbre Vieja continues, with pulsatile emissions of pyroclasts and ash. Ashes always paralyze aerial activity.

The affected area exceeds 1,088 ha, with a flow width of max. 3,300 meters.

With the probability of heavy rains, it is advisable to avoid areas with unstable walls, and areas where ash has accumulated, which could lead to collapses or landslides.

 

Sources: IGN, IGME, InVolcan, DSN

La Palma - seismicity at 25.11.2021 / 06h56 - Doc. IGN

La Palma - seismicity at 25.11.2021 / 06h56 - Doc. IGN

La Palma - RSAM at 25.11.2021 / 05:05 - Doc. IGN

La Palma - RSAM at 25.11.2021 / 05:05 - Doc. IGN

La Palma - new Cumbre vieja fajana expanding - photo IGME

La Palma - new Cumbre vieja fajana expanding - photo IGME

La Palma - Comparison of images taken in Tajuya in September and November 2021. The active cone has grown well - InVolcan photos

La Palma - Comparison of images taken in Tajuya in September and November 2021. The active cone has grown well - InVolcan photos

Pumice and ash generated by the eruption of Fukutoku-Okanoba in August 2021 have just reached the coasts of the islands of Batanes, in the Philippines.

Numerous consequences are observed for boats, blocked sewers, underwater life, and contamination of marine waters.

It is not recommended to bathe in these waters laden with pumice.

 

Source: Phivolcs 24.11.2021

Philippines - Batanes Islands - pumice and ash deposits originating from Fukutoku - Doc. Phivolcs

Philippines - Batanes Islands - pumice and ash deposits originating from Fukutoku - Doc. Phivolcs

Philippines - Batanes Islands - impacts of pumice and ash originating from Fukutoku - Doc. Phivolcs

Philippines - Batanes Islands - impacts of pumice and ash originating from Fukutoku - Doc. Phivolcs

The ice shelf above the 1 km³ Grímsvötn subglacial lake has dropped by about 60cm, indicating that a Jökulhlaup is underway! Ice break-up will likely reach the Skeiðarárjökull outlet within the next 48 hours and the flood will peak in 5-10 days!

Based on the water level measurements at Grímsvötn now, it can be estimated that the maximum runoff rate will be around 5000 m³ / s. Such a freeze would probably have little effect on structures, e.g. roads and bridges. However, it is too early to tell what the extent of the race may be.

There was no increase in electrical conductivity at Gígjukvísl, but it is the clearest sign that the running water came from the glacier. The Meteorological Office has a gas meter at the Gígjukvísl spring, which would also give indications of the presence of running water in the waterway, and therefore closely monitors developments in Grímsvötn.

There are examples of eruptions in Grímsvötn after an ice breakup. The last time this happened was in 2004 and before that in 1934 and 1922.

 

Source: IMO - Updated on 24.11. at 4.30 p.m.

Grimsvötn - path followed by the Jökulhlaup in 1996 - archive image

Grimsvötn - path followed by the Jökulhlaup in 1996 - archive image

Grimsvötn - glacial melt on 07.11.2004 - archive image / author M.T. Gudmundsson

Grimsvötn - glacial melt on 07.11.2004 - archive image / author M.T. Gudmundsson

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