August 20 , 2017. EN. Piton de la Fournaise , San Cristobal , Misti , Ticsani , Nevados de Chillan .

Home / blog georges Vitton / August 20 , 2017. EN. Piton de la Fournaise , San Cristobal , Misti , Ticsani , Nevados de Chillan .

August 20 , 2017. EN. Piton de la Fournaise , San Cristobal , Misti , Ticsani , Nevados de Chillan .

August 20 , 2017.


Piton de la Fournaise , La Réunion :

Activity Report for Saturday, August 19, 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 the surface eruptive intensity), continues its oscillations at an even less regular rate than the previous days.


Figure 1: Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on July 14th and 15h00 (11h00 UTC) on August 19th 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.


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

The latest estimates of lava flows through the use of satellites show lower lava flows than have been observed so far. It should be noted that these estimates remain imprecise due to bad weather conditions on the Piton de la Fournaise .


Source : OVPF


San Cristobal , Nicaragua :

The San Cristóbal volcano began a degassing process on Friday with an ash production with ash falls in a north-westerly direction, as reported by residents of Grecia communities.
The Municipal Committee for Disaster Reduction (COMUPRED) met in an emergency to be attentive to the activity of the highest volcano in the country.

Municipal authorities, firefighters, Civil Defense, Red Cross, MINSA and National Police define actions in communities reporting ash falls.
The volcano, so far shows no sign of explosion. The authorities predict that by midday the activity has already decreased.
It is important that families near the area use masks or wet towels to cover their mouths and protect their eyes from ashes, cover the wells and pay close attention to children.

Source : Sinapred.


Misti , Ticsani , Peru :

Volcanoes Misti and Ticsani maintain a low level of activity.

The two volcanoes near Arequipa and Moquegua, respectively, are monitored by the Geophysical Institute of Peru through nearby seismic stations.
The volcanoes Misti and Ticsani, volcanoes that are part of the list of 16 volcanoes considered active and / or potentially active in Peru, have shown low levels of activity so far this year, according to the latest reports of volcanic activity published By the Geophysical Institute of Peru.

Misti Volcano.

The two giants are monitored in real time by seismic stations installed and strategically distributed in their environment. The information that was analyzed in 2017 shows that the predominant seismic activity is related to the events generated by rock fracturing and not to earthquakes related to fluid movement and / or magma ascension.
« To date we have published 15 activity reports containing the weekly analysis of the behavior of each volcano.Misti and Ticsani produce dozens of earthquakes every day that are assessed for their source.Fortunately, Is not associated with the rise of magma, but it is important to know that a volcano can start an eruption in a few hours, such as the Calbuco in Chile in 2015. This case is very rare, but it Vigilant every minute to the information we receive from our stations, « said Dr. Orlando Macedo, head of the PGI headquarters in Arequipa.

Ticsani Volcano

It should be emphasized that a possible eruption of the Misti represents a risk for about 1 million people who live in the city of Arequipa. In the case of the Ticsani, 5000 people live in the zone of influence of this volcano and could be harmed by the appearance of an eruptive process.


Source : IGP


Nevados de Chillan , Chile :

During this period, 1053 seismic events were recorded, of which forty-nine (49) were classified as VT type volcanic events, related to rock fracturing processes, with maximum local magnitudes (ML) of 2, 6. The highest tremor of energy was located at 4.1 km south-south-east (SSE) of the active crater, at a depth of 3.4 km. Similarly, there were one thousand four (1004) earthquakes associated with fluid dynamics within the volcanic edifice, classified as long-term (LP) events, with a maximum reduced displacement value (DRC) Of 164.5 cm 2.
From 3 to 15 August, thirty-five (35) explosions occurred intermittently, continuing with the explosive phase
Which has presented this volcano since the beginning of 2016.

The images obtained through the cameras installed near the volcanic complex showed explosions around the currently active craters, with a height close to 300 meters, with the exception of 11 August, where the explosion reached a maximum height of 1000 meters.

According to data obtained from four (4) GNSS stations, which measure the surface deformation of the volcano, no significant variation was observed.
The lengths of control lines that cross the active craters show variations less than 0.1 cm / month, suggesting that there are no significant changes on the volcano. The data shown by one (1) electronic inclinometer also suggest that there are no significant processes related to changes in volcano morphology.

No emission of sulfur dioxide (SO2) into the atmosphere has been reported in the volcano sector.

No thermal alerts were reported in the area associated with the volcano according to the data processed by the average infrared observation of volcanic activity (MIROVA) (

During the current period, a less explosive activity of pulsatile nature was recorded, which resulted in emissions of gases and particles with maximum heights of 1000 m above the crater level. Monitoring station data suggest the action of a small apparent volume of magma that interacts with and destabilizes the surface hydrothermal system and induces minor explosions with material emission to the surface in a pulsatile manner.
Therefore, in the current scenario, it is possible that this process will continue with the generation of explosions of similar size or even larger than those recorded.
Due to the foregoing, the Volcanic Technical Alert is maintained at:
YELLOW LEVEL: Evolution of the behavior of the volcanic activity – Probable time for an eruption: WEEKS / MONTHS.
Note: It is recommended to restrict access to the high volcanic hazard zone within a radius of 3 km around the currently active craters.

Source : Sernageomin

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