July 26 , 2017. EN. Piton de la Fournaise , Nevado Del Ruiz , Reventador , Sabancaya , Ol Doinyo Lengai.

Home / blog georges Vitton / July 26 , 2017. EN. Piton de la Fournaise , Nevado Del Ruiz , Reventador , Sabancaya , Ol Doinyo Lengai.

July 26 , 2017. EN. Piton de la Fournaise , Nevado Del Ruiz , Reventador , Sabancaya , Ol Doinyo Lengai.

July 26 , 2017.


Piton de la Fournaise , La Réunion :

Activity bulletin of Tuesday, July 25, 2017 at 4:00 pm (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) remains relatively constant (Figure 1).


Figure 1: Evolution of RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on July 14th and 15h00 (14h00 UTC) on 25th July on the RVL seismic station, 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.



The estimates made by satellite methods via the HOTVOLC platform (OPGC – Clermont Ferrand) always indicate minimum flows of between 1 and 3 m3 / s.

Source : OVPF

Photo : Christian Holveck .


Nevado Del Ruiz , Colombia :

Weekly activity bulletin of the volcano Nevado del Ruiz, from 18 July to 24 July, 2017
The level of activity continues: at the level of yellow (III) activity: changes in the behavior of volcanic activity.

As regards the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Survey reports that:

Over the past week, the various monitoring parameters indicate that the Nevado del Ruiz volcano continues to exhibit unstable behavior.


The seismicity caused by fracturing of the rocks composing the volcano showed a significant decrease in both the number of earthquakes and the seismic energy released compared to the previous week. The earthquakes were located mainly in the Northeast, adjacent areas of the Arenas crater and, to a lesser extent, in the south-east, south-west and distal north areas at depths between 0.2 and 7, 5 km. The maximum magnitude recorded during the week was 0.4 ML (local magnitude), which corresponds to an earthquake recorded on 23 July at 11:46 (local time), located in the Arenas crater at a depth of 1 , 5 km.

The seismic activity associated with fluid dynamics in the structure of the volcanic ducts showed a slight increase in the number of recorded earthquakes, and maintained a similar behavior to the seismic energy released during the previous week. This type of activity is mainly characterized by the occurrence of several seismic events of long period and very long period fluids and tremor pulses, energy levels and variable durations.


Volcanic deformation, measured from electronic inclinometers, continues to record a deflationary process over the last few days.
The volcano continues to emit large amounts of water vapor and gases, including sulfur dioxide (SO2), as shown by the values obtained by the SCANDOAS stations installed in the volcano zone and the «  Analysis of satellite images. In the tracking information provided by the FIRMS Mírová and NASA site, no thermal anomaly was identified during the week.

The column of gas and steam reached a maximum height of 600 m measured on top of the volcano on 18 July. The dispersal direction of the column was predominant towards the northwest of the Arenas crater.

The volcano Nevado del Ruiz continues to activity level Amarillo.


Source : Ingeominas.


Reventador , Ecuador :

Reventador Volcano Activity Bulletin No. 206, Tuesday, July 25, 2017.

The volcano remains with a high and continuous activity. The volcano remained covered. There were light rains, which did not trigger lahars.


(TRL), 3 episodes of tremor (ERT), 26 events of long-period (LP) type and 14 explosions (TL) yesterday until 11:00 (TL) EXP) were recorded.
Observations, emissions and ash:
During the last 24 hours, the volcano remained covered, so it was not possible to make observations at the level of the crater.
Rains and lahars:
Light rains were recorded at dawn and during the morning without lahars being generated until now.

This report will be published on a daily basis at 12:00 (TL). In the case of an increase or change in the behavior of the volcano it will be immediately published a special report.


Source : IGEPN

Photo : Hosteria


Sabancaya , Peru :

Composed of:
– Regional Office for National Defense and Civil Defense (ORDNDC)
– Institute of Geophysics of Peru – PGI
– Volcanological Observatory of the Geological Institute of Mines and Metallurgy – INGEMMET
– Institute of Geophysics of the National University of Saint Augustin, IG – UNSA
– National Institute of the Directorate of Civil-Regional Defense, INDECI
– National Meteorological and Hydrological Service of Peru – SENAMHI.

The volcano Sabancaya, located 75 km northwest of the city of Arequipa, is the second most active volcano in Peru. Since 6 November, 2016, it has presented an eruptive process characterized by recurrent explosions with ash emissions that mainly affect the Colca valley and the volcano area.
Since the beginning of July 2017, there has been a gradual increase in the eruptive process, reflecting an increase in seismic activity directly associated with the rise of magma, which is corroborated by the observed increase in volcanic SO2 gas flows . Thus, the column of eruptive gases and ash reaches mean heights between 2500 and 4500 m above the crater. Since Saturday July 22 the direction of the winds in the area has moved towards the South and Southeast, in the direction of the city of Lluta, Huanca and Arequipa, where it has been possible to observe particles of ash Suspended in some northern districts of the city.

• From the first days of July 2017 there was a gradual and moderate increase in eruptive activity, characterized by repeated explosions and abundant ash falls in the vicinity of the volcano.
• Since July 22, the ashes are scattered mainly in the South and South-East direction. The cities closest to the volcano are the most affected.
• While the ash can reach up to 40 km around the volcano, based on ash projections, it is expected that in the next few days the cities of Lluta and Huanca will continue to be affected by falls of ash. Ashes and even slightly Arequipa.
• At this level of activity, air traffic may be affected in southern Peru.
• Depending on the trend these days, it is possible that this eruptive process to continue at similar levels. If there is a significant change in activity, a new statement will be issued.

Source : IGP


Ol Doinyo Lengai , Tanzania:

Tanzania: GPS sensor data at Ol Doinyo Lengai points toward eruption .

25 JULY 2017. Scientists who study the Ol Doinyo Lengai volcano in Tanzania say that based on readings from sensors placed there in 2016, there’s activity suggesting the potential for eruption that needs to be closely watched.

Sarah Stamps, an expert on the East African Rift System and assistant professor of geosciences at Virginia Tech, and her team placed high-precision GPS sensors around the base of the volcano and connected them for real-time monitoring. The American researchers work with Tanzania’s Ardhi University and the Korea Institute for Geosciences and Mineral Resources on the project.

Now, Stamps – who saw one of the modern-era ‘Mountain of God’ eruptions in 2008 – says that increased earthquakes, ash emissions and a widening crack on the west side of the volcano all point toward eruption. In January, Stamps first saw unusual activity detected by the monitors, followed by other data that suggests that eruption will happen sooner rather than later.



“Imminent in our case means in one second, in a few weeks, a couple of months, or a year or more,” she said in an email to National Geographic, which helps to fund the work and reported her findings on July 13.

The 2,878-meter volcano is about 112 kilometers from Arusha, and poses no immediate threat to closer Maasai residents. Yet it is home to the Engare Sero site, an archaeological treasure where hominim footprints are preserved, as well as those at Laetoli in the Olduvai Gorge.

They could be vulnerable to an eruption given the right conditions – the same conditions, scientists say, that caused them to be preserved in the first place.


Source : AFRICA TIMES / Jeannie Curtis.

Photos : kiliclimbing.

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