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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
Sabancaya - activity between 18 and 24 November 2019 - Doc. IGPeru

Sabancaya - activity between 18 and 24 November 2019 - Doc. IGPeru

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano has remained at moderate levels.

The analysis of records obtained from the seismic network of the Sabancaya volcano for the period 18 to 24 November 2019 has identified the presence of approximately 2,131 earthquakes of volcanic origin, the highest percentage of which is associated with magmatic fluids.

During this period, there was an average of 47 explosions per day of average or low intensity. Visual surveillance, using surveillance cameras, detected the presence of gas columns and ash up to 2.3 km above the top of the volcano, which dispersed to the western and southwest sectors of the volcano.

The monitoring of the deformation of the volcanic structure, using GNSS data (processed with fast orbits), does not present significant anomalies.

Satellite monitoring identified 7 volcanic anomalies on the volcano with values ​​between 1 MW and 16 MW, associated with the presence of a lava dome in the volcano crater of about 240 m of diameter.

Therefore, for the following days, no significant change in their activity is expected

The volcanic alert level remains orange, with a recommendation not to approach within 12 km of the crater.

 

Source: I.G.Peru

Ubinas - activity between 18 and 24 November 2019 - Doc. IG Peru

Ubinas - activity between 18 and 24 November 2019 - Doc. IG Peru

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Ubinas volcano remains low.

To date, earthquake energy associated with rising magma at the surface has decreased. In addition, there are low and sporadic bluish gas (magmatic) and water vapor emissions observed by surveillance cameras. According to this scenario, it is unlikely that volcanic explosions and / or ash emissions will occur. The alert level remains at orange.

 

Source: I.G.Peru

Kadovar - Sentinel image 2 bands 4,3,2 from 21.11.2019 - one click to enlarge

Kadovar - Sentinel image 2 bands 4,3,2 from 21.11.2019 - one click to enlarge

In Papua New Guinea, a slight thermal anomaly of 2MW is reported on 26 November for Kadovar.

On the satellite image Sentinel 2 of November 21, we can see that the vegetation was destroyed by gaseous emissions, always present.

 

Source: Mirova and Sentinel2

Shishaldin - thermal anomalies on 25.11.2019 / 23:25 - Doc.Mirova

Shishaldin - thermal anomalies on 25.11.2019 / 23:25 - Doc.Mirova

Seismicity on the Shishaldin volcano increased during the day of 25 November and small explosions were detected at local and regional infrasound stations.

Very high surface temperatures were observed in several images.

Together, these data indicate that low-intensity eruptive activity has resumed in Shishaldin. No ash plume has been detected.

 

Sources: AVO & Mirova

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