July 22 , 2017. EN. Planchon – Peteroa , Piton de la Fournaise , Dukono , Turrialba , Poas .

Home / blog georges Vitton / July 22 , 2017. EN. Planchon – Peteroa , Piton de la Fournaise , Dukono , Turrialba , Poas .

July 22 , 2017. EN. Planchon – Peteroa , Piton de la Fournaise , Dukono , Turrialba , Poas .

July 22 , 2017.

 

Planchon – Peteroa , Chile :


In the first fortnight, two hundred and twenty events related to processes of fracturing of rigid materials called volcano – tectonic (VT), with a maximum local magnitude (ML) of M 4,1 (REAV 8 July) were recorded. These events were located mainly under the volcano at depths between 4 and 7 km. The largest of these events was located 1.2 km northwest of the main crater, at a depth of 4.8 km.

 


For events related to fluid dynamics, eight hundred and forty-nine long-seismic (LP) seismic events and six tremor-type series (TR) were classified. With regard to LP – type seismic activity, the recorded local magnitudes (ML) were less than M1.1, with a maximum reduced displacement value (RDC) of 3 cm2. For tremor – type seismic activity, reduced displacement values ​​(RDC) were 0.6 cm2, considered to be a low value, while the dominant frequencies were maintained between 0.7 and 1.7 Hz mainly.
CAMView images showed the presence of small, low-energy, whitish degassing, the heights of which did not exceed 50 m above the active craters of the complex.
From the data obtained by three GNSS stations measuring the deformation of the volcanic complex, minor variations in the two horizontal and vertical displacements were observed. As far as the control line through the complex is concerned, it is compatible with the stability recorded by the monitoring stations, indicating low amplitude displacements. Moreover, the data provided by the electronic inclinometer, installed on the complex, showed no change related to the morphology of the volcano.
No sulfur dioxide (SO2) emissions were reported to the atmosphere in the volcanic complex sector, based on data from the Ozone Monitoring (SMI) Group Sulfur dioxide ( Http: //so2.gsfc.nasa gov /) and NESDIS (http://satepsanone.nesdis.noaa.gov).

No thermal alerts were reported in the area associated with the volcanic complex according to data published by the Middle Observation InfraRed (Mirova) on its website (http://www.mirovaweb.it/), using data from Moderate Resolution Imaging spectroradiometer MODIS.

The high seismic energy recorded and the continuity of its presence at levels above the basal level suggests the continuity of a dynamic process in the complex deep magmatic system that does not affect the surface hydrothermal system. In this context, there is the possibility of developing a direct interaction between the two systems, resulting in the generation of minor explosive activity in the first place, affecting areas close to active craters and / Low to moderate amplitude. Therefore, it is recommended to restrict access to a danger zone contained within a 1 km radius around the crater. The level of volcanic alert remains at the level:

YELLOW LEVEL: changes in the behavior of volcanic activity – probable time for a rash: weeks / months.

 

Source : Sernageomin

Photos : Volcanes de Chile , Sernageomin .

 

Piton de la Fournaise , La Réunion :

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 increasing for 24 hours (Figure 1). This is to be related in particular to the closure of the cone (FIGS. 2, 3) which increases the pressure on its walls.

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 21st on the seismic station of RVL, located on the flank South of the volcano. (© OVPF / IPGP)

Observations made today by the OVPF teams show that the eruptive cone downstream of the eruptive crack continues its edification (Figures 2, 3) and closes. Three main eruptive mouths are visible on the inside. This morning only the central eruptive mouth remained eastward towards the east (Figures 2, 3).

 

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

Numerous lava tunnels have been formed downstream of the cone. Fractures within these tunnels allow many lateral extension arms to escape.

Figure 2: Shooting at the eruptive site on July 21, 2017, 9:10 am (local time). (© OVPF / IPGP)

Figure 3: Shooting at the eruptive site on July 21, 2017, 11:30 am (local time). (© OVPF / IPGP)

– No earthquakes have been recorded this day.
– A slight deflation (deflation) is always observed at the top of the terminal cone.

Estimates carried out by satellite methods via the HOTVOLC platform (OPGC – Clermont Ferrand) show flow rates between 1 and 3 m3 / s.

 

Source : OVPF

Photos : Kiwi , Ovpf.

 

Dukono , Indonesia :

Volcano Observatory Notice for Aviation (VONA):

Last Issued: 20170722/0318Z
Current Aviation Color Code: ORANGE

Volcanic Activity Summary:

Eruption with volcanic ash cloud at 0305 UTC (1205 local).
Volcanic Cloud Height:
Best estimate of ash-cloud top is around 5533 FT (1729 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer.

Other Volcanic Cloud Information:
Ash cloud moving to East.
Remarks:
Volcanic tremor recorded continuously.

 

Kegempaan Dukono

 

Conclusion:
The level of activity of G. Dukono is at Level II (Waspada)

 


Recommendations:
Communities around G. Dukono and visitors / tourists should not have activities, climb and approach the Malupang Warirang Crater within a radius of 2 km. Given that volcanic ash eruptions occur periodically and ash propagation follows the direction of the wind and its speed, the areas affected by the ash are not fixed. It is recommended that people around G. Dukono always have a mask to cover the nose / mouth that can be used when needed to avoid the danger of volcanic ash on the respiratory system.

Source : VSI / Magma .

 

Turrialba , Costa Rica :

Activity report of the Turrialba volcano, 21/07/2017.

On 21.07.2017 at 07:30 local time, an eruption was recorded on the Turrialba volcano, with an ash column that rose 500 meters above the crater at 3840 meters (12595.2 ft ).
Duration of the activity: Ongoing.
The winds are oriented towards the Southwest.

Ash falls reported in: There have been no reports at least so far
Smell of sulfur reported in: There have been no reports at least so far

 

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

The Turrialba volcano has a low and medium amplitude fluctuating volcanic tremor signal as well as several low frequency earthquakes (BF), both associated with the circulation of fluids (water, gas, magma). The emission of a bluish plume of water vapor rich in magmatic gas and aerosols (very fine liquid or solid particles) continues to occur passively (non-explosive). No ash fall or sulfur odor has been reported in the last 24 hours. An intense glow is observed during the evening and night inside the western crater through webcams.

Comments: The volcano emits relatively fine ash particles and small amounts of rocks. According to the data of 21 July 2017 of the OVSICORI-A Volcanic Aerosol Monitoring Station located in Coronado, these fine particles emitted by Turrialba have aerodynamic diameters equal to or less than 10 micrometers, or even equal to or less than 1 micrometer.

 

Source : Ovsicori.

Photo : RSN

 

Poas , Costa Rica :

Activity report of the Volcano Poas, 21/07/2017.

During the last 24 hours, the seismic signals of the seismographs recorded a volcanic tremor of low amplitude and variable duration, as well as a small number of volcano-tectonic earthquakes (VT) of small amplitude, associated with the rupture of rocks or Of fracture inside the volcano.
The emission of a vigorous plume of blue-white color, rich in water vapor, magmatic gases and aerosols (fine solid or liquid particles) which is continuous and persistent through the mouth A (Bocca Roja); While the B (Boca Azufrada) mouth, of lower temperature, emits water vapor, gases and yellow particles of abundant native sulfur.

 

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


The volcanic plume reached altitudes between 300 and 500 meters above the crater that spread near the surface of the ground mainly southwest and west, according to the map of the AERMOD calculation model, Meteorological data from the National Institute of Meteorology IMN.
The NASA AURA IMO Sulfur Dioxide Gas Satellite Measurement instrument continues to detect significant SO2 gas emissions from Poas and Turrialba which are mainly dispersed to the Southwest, Central, Nicoya Peninsula and the Pacific Ocean.

Source : Ovsicori

Photo : RSN

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