November 09, 2015. EN. Etna, Rinjani, Cotopaxi .

Home / blog georges Vitton / November 09, 2015. EN. Etna, Rinjani, Cotopaxi .

November 09, 2015. EN. Etna, Rinjani, Cotopaxi .

November 09,  2015.



Etna, Sicilia:

Mise à jour Etna, le 8 Novembre, 2015,   11H00 GMT



      During the last days, the Strombolian activity inside the crater of Voragine, one of the four summit craters of Etna, continued. The intensity and frequency of explosions showed no significant changes compared to the information updating on November 5, 2015. Some explosions are accompanied by the formation of small puffs of ash that rarely exceed the crater rim to rapidly disperse into the atmosphere. Also continued a great degassing from the   Northeast crater, accompanied by frequent rumblings in the ducts of the same crater , as well as at the New Southeast Crater (NCSE), where numerous fumaroles are present, both  in the crateric depression and the southern and eastern flanks of the cone.


At 0:13 UTC (local time = -1) on November 8, 2015, took place on a single small explosion in the crater of NCSE, which generated a plume of gas (possibly with a small amount of volcanic ash) up to about 300 m, and a brief anomaly visible on the images of thermal cameras (see the left image, taken by the thermal camera on the Montagnola, EMOT, on the southern slope of Etna). The explosion was followed in the hours that followed, by reduction of degassing of the NCSE.

Source : INGV /  B Behncke.

Photo: Salvatore Lo Giudice



Rinjani, Indonesia :

The level of seismicity of G. Rinjani after the first eruption dated on October 25, 2015 showed an increase mainly in the amplitude of tremor. This one was recorded continuously from November 2, 2015 23:00 until November 5, 2015 at 18:00. Direct field observations on November 3 to 4, 2015 indicate that earthquakes are correlated with the constant eruptions occurring on the cone of the G. Barujari.


Visually, the G. Rinjani surface activity after the eruption of October 25, 2015, shows an observed increasing. Emission of smoke was observed coming out of the crater continuously with a maximum height of 2000 m above the G. Barujari.
G. Barujari products ash emissions,  pyroclastic impact on the cone of G. Barujari and lava flows that descend to the north of the crater. The threat of immediate danger as pyroclastic flows and lava emissions are still present in the caldera of Rinjani.

Until today the eruption still has the potential to continue as indicated by the tremor, recorded continuously.



Based on the visual and instrumental analysis as well as considering the potential threat of danger, November 5, 2015 at 18:00, Mount Rinjani is registered at Level II activity level (Alert / Waspada).
Intensive surveillance is conducted to assess the level of activity on G. Rinjani.

The communities around Mount Rinjani and visitors / tourists are not allowed to move or camp in G. Rinjani caldera and within a radius of 3 km around the crater of G. Barujari in G. Rinjani caldera.
If emission of ash, people should stay at home, and if they are outside the houses are encouraged to wear a mask to cover the nose and mouth and eye protection to prevent respiratory infections (ARI) and eye irritation.




Photo : Ade Adrian


Cotopaxi, Ecuador :


During the last week, on the Cotopaxi volcano, there was a decrease of the external activity, which is characterized mainly by gas columns, white, which reached up to 2 km above the crater. The presence of ash was lower than previous weeks possibly indicating the end of the phase, which began on October 3. It was recorded between 50-100 volcano tectonic earthquakes (VT) per day, which represents a slight increase from the previous week. The great majority of these types of VT events are small amplitudes. SO2 levels gases were at least 2,500 tonnes / day.

There were sporadic episodes of tremor emission and some small explosions.



Informe Especial Cotopaxi N. 22 - 2015

The visual observation conditions were variable. However emission columns last week were up to 2000 m but usually less than 1000 m above the crater with low load of ash. The wind direction varied between Nortd-West and South, predominantly to the west. The brightness of the crater was also observed during clear nights.

The inclinometer VC1 deformation   shows a diagram less pronounced compared to previous months. The trend in recent weeks of October showed a slight increase in its slope can be related to the slight increase in the number of recorded VT events.
During the last week small falls of ash fell in the Cotopaxi National Park, while in the more remote areas these falls were minimal. No major changes were observed in the size of the ash (very thin) or components (mainly from the pipe material, possibly slightly juvenile).


Source : IGEPN

Photo : Jean-Luc Le Pennec, IRD-IGEPN

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