August 05 , 2017. EN. Piton de la Fournaise , Copahue , Nevados de Chillan , Misti , Fuego .

Home / blog georges Vitton / August 05 , 2017. EN. Piton de la Fournaise , Copahue , Nevados de Chillan , Misti , Fuego .

August 05 , 2017. EN. Piton de la Fournaise , Copahue , Nevados de Chillan , Misti , Fuego .

August 05 , 2017.


Piton de la Fournaise , La Réunion :

Activity bulletin of Friday, August 4, 2017 at 3:00 pm (local time).

The eruption begun on July 14 at 00:50 local time continues. The volcanic tremor (indicator of surface eruptive intensity) continues to decline very gradually (Figure 1).


Figure 1: Evolution of RSAM (volcanic and erosion intensity indicator) between 00:00 (20h UTC) on July 14th and 14h30 (10h30 UTC) on August 4th on the seismic station of RVL, located on the flank South of the volcano. (© OVPF / IPGP)

In the field, the activity is now mainly in lava tunnels with some visible surface resurgences on a small spatial extension. However, gas emissions remain high.

L’image contient peut-être : ciel, plein air et nature

– No earthquakes have been recorded in the past 24 hours.
– The trend recorded on deformation sensors, in particular GPS, at the top of the volcano, seems to register a resumption of inflation again. This parameter will be followed in the next few days.

Estimates carried out using satellite methods via the HOTVOLC platform (OPGC – Clermont Ferrand) show a minimum flow rate of less than 1 m3 / s.


Source : OVPF

Photo : Fournaise info.



Copahue , Chile :

During this period, 52 seismic events were recorded, seventeen of which were classified as volcano-tectonic (VT), associated with fracturing processes of rigid materials. Similarly, 35 events associated with fluid dynamics within the volcano, classified as long period (LP) and very long period (VLP), with reduced displacement values ​​(DRC) of 3.8 cm2 been recorded.
For VT seismicity, local magnitudes (ML) were less than or equal to M1.5. The highest energy event was located 9.1 km east of the El Agrio crater, at a depth of 7 km.
Throughout the period, a constant low-intensity tremor signal was recorded, mainly associated with the exit from the El Agrio crater. This signal had mean displaced displacement (DRC) values ​​of 3.0 ± 0.5 cm2, with main dominant frequencies in two bands, one around 0.6 Hz and the other in a bandwidth ranging from 1, 1 to 1.7 Hz.
According to the data provided by two GNSS stations, no deformation is observed due to changes in the internal dynamics of the volcano.

Résultat de recherche d'images pour "copahue"
The IP cameras installed on the volcano recorded a constant degassing of the active crater (El Agrio), characterized by sporadic ash emissions. The largest emission column was directed to the south-east, with a maximum height of 280 m. During the night, an incandescence was observed when the climatic conditions allowed to observe the volcano.
No emission of sulfur dioxide (S02) into the atmosphere has been reported in the volcanic area, according to data published by the Ozone Monitoring Instrument (OMI) Sulfur dioxide group (http: //so2.gsfc. and NESDIS) (
No thermal alert was reported in the area associated with the volcano during the second fortnight, according to the data processed by the MIROVA infrared observation ( and MODVOLC (http: //modis.higp /).

Résultat de recherche d'images pour "copahue"

During the second half of July, there was a decrease in surface activity with columns of gas not exceeding 300 m altitude, with a pulsed production of particulate matter which sporadically generates nocturnal incandescence. Again, seismic series related to the mobilization of small pulses of magma at surface levels (VLP signals) have been recorded suggesting that the magmatic process, although with low intensity energy, is still active, Which could result in increased surface activity with ash emissions and / or minor explosions affecting the area surrounding the crater.

Therefore, the Copahue volcano remains at the technical alert level of:
YELLOW LEVEL: Changes in the behavior of volcanic activity – Probable time for eruption: WEEKS / MONTHS.

Observation: Preventive restrictions are recommended to access an area of ​​1000 meters around the crater, taking into account the fact that the fumarol activity persists.


Source : Sernageomin .

Photo : Valecaviahue , Neuquén Informa .


Nevados de Chillan , Chile :

During this period, 889 seismic events were recorded, of which 57 were classified as volcano-tectonic (VT) events, in relation to fracturing processes of rigid materials, with maximum local magnitudes of M2,3. The largest-energy earthquake was located 0.7 km east-southeast of the active crater, at a depth of 1.7 km.
Similarly, there were 832 earthquakes associated with the dynamics within the volcanic edifice, 829 of which were cataloged as long-term (LP) events, with maximum displacement values ​​(DRCs) of 2, 7 cm2.
In addition, 2 tremor-type earthquakes with maximum displacement values ​​(DRC) of 3.4 cm2 were recorded.
Finally, a long-term « Tornillo » (TO) event was recorded in connection with the passage of magmatic and / or hydrothermal fluids inside volcanic conduits, with high impedance contrasts, with Reduced displacement values ​​(DRC) less than 1.0 cm2.

The images obtained through the cameras installed near the volcanic complex have mainly shown fumaroles associated with emissions of water vapor from the currently active craters. The maximum height was recorded on 31 July at 01:23 GMT. This episode was associated with a low-energy explosion, with a calculated height of 100 meters.
According to data provided by the GNSS stations operating on the volcanic edifice, no deformation due to changes in volcanic morphology was observed. The data provided by the inclinometric stations indicated a stability in the morphology of the volcanic edifice.

No emission of sulfur dioxide (S02) into the atmosphere has been reported in the volcanic complex sector, according to data published by the Ozone Monitoring Instrument (OMI) Sulfur dioxide group (http: // so2. and NESDIS (
No thermal alert was reported in the area associated with the volcanic complex according to the data processed by the IROVA observation of volcanic activity ( and MODVOLC thermal monitoring.


Although during this period the explosive activity was minimal, the characteristics of the recorded seismicity continue to reflect the internal dynamics of the volcanic system, suggesting the interaction of a magma body with the superficial hydrothermal system, and the possibility of new explosions of similar size or even larger than those previously recorded. Due to the above, the level of volcanic technical alert is maintained at:
YELLOW LEVEL: Changes in the behavior of volcanic activity – Probable time for eruption: WEEKS / MONTHS.

Note: It is recommended that preventive access restrictions be applied to an area within a radius of 3 kilometers around the crater.


Source : Sernageomin .


Misti , Peru :

1.- Sismo-volcanic monitoring:

The seismic activity of the Misti volcano remains low.
• Complex LF earthquakes (double events related to fracturing and fluid pressure) increased during this period, corroborating the upward trend observed during the first week of July. There were peaks of activity recorded on 17 and 31 July and an average frequency of 6 earthquakes per day.
Volcanic-tectonic events (VT), associated with rock fracturing, increased at similar levels of occurrence during the last two weeks of June (53 VT / day). At present, 47 earthquakes per day, 43% more than the previous period. However, the energy generated by VT-type events has remained low.


2.- Satellite Surveillance
Thermal anomalies: The MIROVA system ( of the University of Turin (Italy) has not detected thermal anomalies on the Misti volcano for this period (VPR = 0 Megawatts).
SO2 Anomalies: The GSO-NASA satellite system « EOS Aura » ( did not record significant anomalies of SO2 gas density for the Misti volcano.

Misti volcanic activity remains low.
Complex LF events were increased by showing a daily average of 6 events and recording two significant peaks occurring on July 17 and 31. With regard to VT seismicity, its value is in normal activity levels, reaching 47 VT per day and low energy averages.
No thermal anomaly or high density of SO2 gas was detected for the Misti volcano.

Any changes will be reported in a timely manner.

Source : IGP


Fuego , Guatemala :

Special volcanological activity bulletin, Guatemala 04 August 2017, 10.30 (local time)


Attraction type: Vulcanian
Morphology: Composit Stratovolcano
Geographical location: 14 ° 28’54 « Latitude N; 90 ° 52’54 » Longitude W.
Summit : 3,763msnm.


The eruptive model of the volcano Fuego has increased in the last hours. At night, incandescent pulses of 100 and 200 meters high were observed, feeding a 700-meter long lava flow towards Canyon Ceniza. Moderate to severe explosions were observed, ejecting columns of ash, which reached 4700 m (15,420 feet) and moved west and southwest for a distance of 12 kilometers. However, wind gusts can move fine particles of ash over a greater distance. The explosions generate rumblings and shock waves in the villages of Panimache, Morelia, Panimache II, located 6 kilometers from the volcano. The observatory of the Fuego volcano reports ash falls in the villages of Panimache, Morelia, Hagia Sophia.

Source : Insivumeh

Photo : Photonoticia

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