July 25 , 2017. EN. Piton de la Fournaise , Poas , Turrialba , Wolf , Sabancaya .

Home / blog georges Vitton / July 25 , 2017. EN. Piton de la Fournaise , Poas , Turrialba , Wolf , Sabancaya .

July 25 , 2017. EN. Piton de la Fournaise , Poas , Turrialba , Wolf , Sabancaya .

July 25 , 2017.


Piton de la Fournaise , La Réunion :

Activity report on Monday 24 July 2017 at 16h30 (Local time).

The eruption begun on July 14 at 00:50 local time continues. The intensity of the volcanic tremor (indicator of surface eruptive intensity) has been relatively constant for 24 hours (Figure 1).


Figure 1: Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on July 14th and 16h00 (12h00 UTC) on July 24th on the seismic station of RVL, located on the flank South of the volcano. (© OVPF / IPGP)

– No earthquakes have been recorded this day.
– The trend observed on deformation sensors, in particular GPS, seems to stabilize or reverse (to inflation). This parameter will be followed in the next few days.


HOTVOLC (OPGC – Clermont Ferrand) and MIROVA (University of Turin) estimations carried out by satellite methods indicate flow rates between 1 and 4 m3 / s. The total volume of runs after 10 days of eruption was estimated to be 5.3 ± 1.9 Mm3 (estimated from MIROVA data).

Source : OVPF.

Photo : Planetair974.


Poas , Turrialba , Costa Rica :

Activity report of the Poas and Turrialba Volcanoes, 24 July 2017, updated at 12.30.

Volcano Poas:
Over the last 24 hours, seismographs have recorded continuous seismic activity with a volcanic tremor signal of very small amplitude and varying durations, as well as a number of small-scale volcano-tectonic (VT) events , Associated with fracturing of rocks or collapses inside the volcano.
The emission of a vigorous and persistent plume of blue-white water vapor, gases and magmatic aerosols (fine solid or liquid particles) continues in mouth A (Bocca Roja); While the B (Boca Azufrada) mouth, of lower temperature emits steam, gases and abundant yellow particles of native sulfur.


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

The volcanic plume has reached altitudes of nearly 300 meters above the crater and its dispersion has been mainly towards the southwest, according to the plane of dispersion of the gases and particles obtained with the model of calculation AERMOD and data IMN of the National Institute of Meteorology. According to this plan, the dispersion of Poas emissions could be carried out in the region including the Poas, Altura, Villa Inés, Cabuyal, Naranjo, San Ramon, Atenas, Esquipulas, Palmares, Cirri, Grecia, Tacares National Park, Alajuela, Guácima, San Pedro de Poas, etc. None of these localities reported smell of sulfur or ash falls.

Turrialba Volcano:
The Turrialba seismograph network continues to record volcanic tremor signals of moderate amplitude and variable duration, as well as frequent LF low frequency earthquakes. These two types of earthquakes are associated with the movements of fluids (water, gas, magma) in the network of cracks and passages in the volcano. The emission of a bluish plume of 200 m altitude, containing water vapor, gases and magmatic aerosols (very fine liquid or solid particles) continues to occur passively (non-explosive). No sulfur smell or ash was reported. An incandescence continues to be observed during the evening and night inside the western crater on the images of webcams.
The wind scatters the volcanic plume at low altitude mainly west.


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

The OVSICORI volcanic and aerosol monitoring station located east of San José Coronado (UNA-EMVA) reports that during the day of July 24, the prevailing winds are the trade winds of the «  (Cartago, San José, Heredia and Alajuela) and transported moderate quantities of SO2 and very fine aerosols (PM2.5), mainly emitted by the Turrialba volcano . Aerosol concentrations PM2.5 in air at Coronado did not exceed the maximum permissible daily mean value of 35 ug / m3 and CO2 concentrations remained below the mean hourly mean 75 ppb (Equivalent to 0.200 mg SO2 / m3).

Source : Ovsicori

Photos : RSN


Wolf , Galapagos islands , Ecuador  :

Searches common with Cambridge University on the Wolf Volcano, Galapagos.

In June 2017, members of the Institute of Geophysics of the National Polytechnic Institute (IGEPN) and scientists from the University of Cambridge (UC) and a guard from the Galapagos National Park (PNB) Investigation into the eastern flank of Wolf volcano (Island Isabela). The mission was prepared with the help of the Charles Darwin Foundation. Field work was carried out on the lava flows emitted during the eruption from May to July 2015 and were also conducted on ancient lava flows associated with numerous eruptive periods of the Wolf volcano.



A drone provided by the Streva project carried out aerial images of the flows to produce orthophotos and numerical modeling of the high resolution terrain in order to estimate the volume of magma emitted during the eruption. Lava and slag samples were collected and analyzed (petrology and geochemistry) at the University of Cambridge to determine the pre-eruptive conditions of the magma and to determine the configuration of the volcano’s feeding system. The objective of this research is to understand why the eruptions of the Wolf volcano soar and the volcanos of the Galapagos in general, in order to improve the evaluation of volcanic risks in the short and long term.

Source : IGEPN


Sabancaya , Peru :

The Technical and Scientific Committee has just published a new report on the current activity of the Sabancaya volcano, which analyzes its behavior during the last week.
The report highlights an increase in the explosive activity of the volcano, which indicates that between July 17 and 23 there were on average 24 explosions per day (previous week 19 explosions / day). It indicates that the ash plumes reached about 4500 meters above the crater and the ashes ejected after these events are preferably scattered north, east and south.

Explosive activity showed an average of 24 explosions / day, a higher number than last week, with maximum displacement values ​​of 50 cm2. The events relating to the rise of magmatic materials (hybrid) have increased significantly. In addition, events associated with fluid movements (long duration) and ash emissions (Tremor) have also increased, to a lesser degree.

The columns of gas and ash eruption increased during the previous week, reaching approximately 4500 m above the crater, dispersed within a radius of 40 km in the north, east and south direction, predominantly.
On the other hand, the GNSS SBSE (Southeast) station continues to record a currently negative trend in the deformation of the volcano, probably related to the expulsion of gases and ash.
The volcanic gas flow (SO2) recorded on July 23, showed a maximum value of 2692 tons / day.

According to the Mirova system, there were six thermal anomalies with values ​​between 1 MW and 6 MW.
Overall volcanic activity has increased.
This activity may continue to increase in the coming days.


Source : IGP

Photo : Archive OVI

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