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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
Etna - The new scoria cone in the Voragine crater, seen by helicopter on the afternoon of September 15, 2019. In the foreground, on the right, we can see part of the Northeast crater; in the background, the ridge of the southern edge of the crater of Bocca Nuova. - photo Boris Behncke / via INGVvulcani

Etna - The new scoria cone in the Voragine crater, seen by helicopter on the afternoon of September 15, 2019. In the foreground, on the right, we can see part of the Northeast crater; in the background, the ridge of the southern edge of the crater of Bocca Nuova. - photo Boris Behncke / via INGVvulcani

Strombolian activity continues at the Voragine crater of Etna. The explosions eject coarse-grained materials, which reach several tens of meters above the edge of the crater, with some products falling on the edges and outer slopes of the crater. The accumulation of pyroclastic materials around the vent creates a cone of slag in the crater. From time to time, rather diluted ash emissions are also observed in the northeast crater, which disperse rapidly in the atmosphere.

The SO2 flux measured with the FLAME-Etna network, at 9:30 UTC, indicates an average daily value at a mean-low level below the attention threshold of 5000 t / day.

 Etna - tremor from 09.09 to 16.09.2019 - Doc. INGV Catania

 Etna - tremor from 09.09 to 16.09.2019 - Doc. INGV Catania

During the afternoon of September 13, the average amplitude of the volcanic tremor reached the lowest values ​​recorded since the beginning of the last eruptive activity. Until the moment of the update, the magnitude of the tremor has slightly increased, but remains at a median level. Regarding the location of the source of volcanic tremor that, on Saturday, September 14, was mainly below the crater Voragine, it is located since the beginning of September 15 essentially under the crater Northeast. The volcanic tremor source is currently at an altitude of 2700-2900 m above sea level, with a tendency to deepen.

During the weekend, infrasound activity showed a slight increase in the frequency of events. The sources of the events are mainly Voragine and, to a lesser extent, Bocca Nuova and the Northeast crater.

Data from soil deformation networks show no substantial variation from those reported in our previous report (12 September).

 

Source: INGVvulcani - local report 16,09,2019 13:53

Etna - The new cone of slag in the crater Voragine, seen September 15, 2019 evening - photo Francesco Ciancitto, Osservatorio Etneo / via INGVvulcani.

Etna - The new cone of slag in the crater Voragine, seen September 15, 2019 evening - photo Francesco Ciancitto, Osservatorio Etneo / via INGVvulcani.

The Geophysical Institute of Peru (IGP) reports that eruptive activity at the Sabancaya volcano has remained at moderate levels between 9 and 15 September, with moderate and continuous explosions accompanied by ash emissions.

At the seismology level, 2561 earthquakes of volcanic origin have been recorded, most of them associated with the movement of magmatic fluids (LP) and some signals associated with the breaking of rocks inside the volcano. The seismic signals associated with the rock rupture (VT) were located 14 km east of the Sabancaya volcano crater and 10 km deep, with magnitudes less than M3.5.

During the last week, 32 average daily explosions were recorded, ranging from medium to low magnitude. Visual surveillance, using surveillance cameras, made it possible to visualize the occurrence of columns of gas and ashes until 2.5 km high above the top of the volcano, which were later dispersed to E and SE areas of Sabancaya.

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

Satellite monitoring has identified 9 volcanic VRP anomalies between 1 and 25 MW, associated with the presence of a hot body near the crater of the volcano.

RECOMMENDATIONS of the IGP:

• Keep the volcanic warning level in orange.

• Do not approach a radius less than 12 km from the crater.

 

Source: IG Peru

Sabancaya - summary of activity from 9 to 15.09.2019 - Doc. IG Peru

Sabancaya - summary of activity from 9 to 15.09.2019 - Doc. IG Peru

In Chile, the minor eruption continues in Nevados de Chillan, with minor explosions and lava flow.

VAAC Buenos Aires reports an ash plume at 3,700 meters above sea level (Flight 120 algebra) moving 35 km northwest, on 16.09.2019.

The area likely to be impacted is 5 km NE and 3 km SE.

The naranja alert is maintained.

Nevados de Chillan - explosive and effusive activity of 15.09.2019 - Webcam therm. Sernageomin

Nevados de Chillan - explosive and effusive activity of 15.09.2019 - Webcam therm. Sernageomin

Nevados de Chillan - explosive activity of 17.09.2019 / 5:43 am - webcam Portezuelo / Sernageomin

Nevados de Chillan - explosive activity of 17.09.2019 / 5:43 am - webcam Portezuelo / Sernageomin

On the other hand, the level of alert of the Villarica was lowered to Amarilla, following a tendency to fall of the seismic activity, and signals of tremor that disappeared.

An area of ​​1 km radius around the crater is maintained.

 

Source: Sernageomin

Villarica - photo archives 02.2019 Volcanologia in Chile

Villarica - photo archives 02.2019 Volcanologia in Chile

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