August 21 , 2017. EN. Planchon Peteroa , Piton de la Fournaise , Copahue , Fuego .

Home / blog georges Vitton / August 21 , 2017. EN. Planchon Peteroa , Piton de la Fournaise , Copahue , Fuego .

August 21 , 2017. EN. Planchon Peteroa , Piton de la Fournaise , Copahue , Fuego .

August 21 , 2017.


Planchon Peteroa , Chile :

Volcanic Complex Planchón -Peteroa:

During the first two weeks, there were forty-two (42) events related to rock fracturing events, known as volcano-tectonic (VT), with a maximum local magnitude (ML) of 1.8.
The location of the earthquakes was concentrated mainly under the volcanic edifice at depths between 4 and 7 km. The biggest earthquake was located 4 km to the north (N) of the main crater, at a depth of 7 km.
For events related to fluid dynamics, one thousand thirty-seven (1037) long-period seismic (LP) events and fourteen (14) tremor (TR) signals were classified. For LP type seismicity, it recorded local magnitudes (ML) less than M1,3 and reduced maximum displacement values ​​(CKD) of 2.5 cm2
In terms of Tremor seismicity, the reduced displacement values ​​(DRC) were 0.8 cm2, a value considered to be low, while the dominant frequencies were present between 0.7 and 1.7 Hz mainly.


The IP camera images showed the presence of low energy degassing and whitish coloration, the heights of which did not exceed 60 m above the level of the active craters of the Complex.

From the data obtained by two (2) GNSS stations, which measure the deformation of the volcanic complex, there were no significant variations. On the other hand, the data provided by one (1) electronic inclinometer, installed in the complex, also show no changes related to the internal activity of the volcano.

No anomalies have been reported in atmospheric sulfur dioxide (SO2) emissions near the volcanic complex, according to data from the Ozone Monitoring Instrument (OMI) Group ( Http: //so2.gsfc.nasa .gov /) and NESDIS (
No thermal alert was reported in the area associated with the volcanic complex according to the data published by the MIROVA (Mean Infra-red Observation of Volcanic Activity) on its website (

Although a high seismic activity rate persists over the period assessed, energy levels are comparatively lower than those recorded in previous months, continuing at levels above their baseline. Although the current phenomenon has little superficial expression and the deformation measurements of the volcano do not show evidence mainly associated with internal deformation, its dynamics suggests the action of a deep magmatic system that does not yet affect the Hydrothermal surface system. Consequently, it is not excluded that the current process could evolve, leading to a direct interaction between the two systems, which could favor a small to moderate size surface activity, which would affect active crater areas.

Therefore, it is considered a dangerous area that is contained within a radius of 1 km around the area of ​​active craters. It is recommended that you restrict access. The level of volcanic alert is maintained at the level:
YELLOW LEVEL: evolution of the behavior of volcanic activity – Probable time for eruption: WEEKS / MONTH


Source : Sernageomin

Photos : Sernageomin, Volcanes de Chiles


Piton de la Fournaise , La Réunion :

Activity Report for Sunday, August 20, 2017 at 3:00 pm (local time).

The eruption that began on July 14 at 00:50 local time continues. The volcanic tremor (indicator of surface eruptive intensity), ceased its oscillations early last night (around 18:00 UTC) to stabilize at a very low level.


Figure 1: Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on 14th July and 15h00 (11h00 UTC) on August 20th on the seismic station of RVL, located on the flank South of the volcano. (OVPF / IPGP)

– No volcano-tectonic earthquake was recorded under the summit craters during yesterday’s day.
– The slight inflation (swelling) of the entire terminal cone of the volcano since the beginning of August (<1 cm since the beginning of the eruption) seems to disappear. This trend will remain to be confirmed in the coming days.


The presence of clouds, unfortunately, did not make it possible to estimate the flow of lava by the use of satellites.

Source : OVPF

Photo : Laurent Perrier


Copahue , Chile :

During this period, twenty-three (23) seismic events were recorded, of which twenty (20) were classified as volcano-tectonic (VT), associated with fracturing processes of rigid materials. Similarly, three (3) events associated with fluid dynamics within the volcano were recorded, two (2) were classified as long period (LP) and one (1) very long period (VLP), with reduced displacement values (DRC) of 9.6 cm2.
For VT seismicity, local magnitudes (ML) were less than or equal to M1.7. The highest energy event was located in the Northeast (NE), 7.7 km from the El Agrio crater with a depth of 8 km.

Throughout the period, a constant low-intensity tremor signal was recorded, mainly associated with the gas flow of the El Agrio crater. This signal had significant DRC values ​​of 3 ± 0.5 cm2, with major dominant frequencies in two bands, one around 0.6 Hz and the other between 1.1 and 1.7 Hz.
According to the data provided by two active GNSS stations, no surface deformation due to changes in the internal dynamics of the volcano is observed.
The IP cameras installed near the volcano recorded a constant degassing of the active crater (El Agrio), characterized by sporadic ash emissions. The largest column was directed to the South-East (SE), with a maximum height of 500 m. During the night period, no incandescence was observed when the weather permitted to observe the volcano.

No emission of sulfur dioxide (SO2) into the atmosphere has been reported in the volcano sector, according to data published by the Ozone Monitoring Instrument (OMI) Group (http://so2.
No thermal alarm was reported in the area associated with the volcano during the second fortnight, according to data processed by the IR observation of volcanic activity (MIROVA) (http: //www.mirova .

In the same way as during the previous period, during the first two weeks of August, a decrease in volcanic monitoring parameters was observed. Surface activity showed columns of gas not exceeding 500 m and no incandescence at night, but they showed the detection of sporadic emissions of particles.
Although monitoring levels indicate a decrease in internal activity, the presence of particulate emissions still indicates some instability of the magma system.

Therefore, the level of technical alert remains at the level of:
YELLOW LEVEL: Evolution of the behavior of volcanic activity – Probable time For an eruption: WEEKS / MONTHS.
It is recommended that access restrictions be applied preventively to an area of a radius of 1000 meters around the active crater.

Source : Sernageomin .


Fuego , Guatemala :

SPECIAL VOLCANIC BULLETIN, Guatemala 20 August 2017, 10.30 (local time)

Attraction type: Vulcanian
Morphology: Stratovolcan composite
Geographical location: 1 4 ° 2 8 ’54 Latitude N; 90 ° 52 ’54 ̋ Longitude W.
Height: 3,763 m.

At present, the eruption of the Fuego volcano continues, 23 hours after its beginning, generating moderate to strong explosions, and ash columns reaching about 6,000 meters (19,685 feet) dispersing over 25 kilometers to the west and southwest
Falls of ash are reported in the communities of Panimaché I, Morelia, Hagia Sophia, El Porvenir, Sangre de Cristo, Yepocapa.


There are two streams of lava, the first in the direction of Canyon Ceniza with a length of approximately 1,500 meters and the second in the direction of the Seca (Santa Teresa) ravine with a length of 1,200 meters, accompanied by incandescent avalanches on the outline of the crater.
The eruption generates moderate rumbles and moderate to strong shock waves, causing vibrations in the roofs and windows of houses near the volcano,
It is also possible to hear constant sounds similar to those of a locomotive engine.
The eruption is maintained with energy, so it is possible that in the next few minutes and / or hours, pyroclastic flows can be generated.

Source : Insivumeh

Photo : David Rojas

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