August 06 , 2016. EN. Planchon-Peteroa , Copahue , Mauna Loa , Kilauea , Klyuchevskoy .

Home / blog georges Vitton / August 06 , 2016. EN. Planchon-Peteroa , Copahue , Mauna Loa , Kilauea , Klyuchevskoy .

August 06 , 2016. EN. Planchon-Peteroa , Copahue , Mauna Loa , Kilauea , Klyuchevskoy .

August 06 , 2016.

 

Planchon-Peteroa , Chile :

Volcanic complex  PlanchonPeteroa (18-31 July).
The level of activity of the complex is at: YELLOW: changes in the behavior of volcanic activity -Time for a probable eruption weeks / months.

During the reporting period, two thousand two hundred and sixty five (2265) volcano-tectonic earthquakes  (VT), processes related to the fracturing of rigid material with local magnitudes less or equal (ML) to M 2.1, mainly located in the volcano at depths between 4 and 8 km were recorded.
The largest of these events was located 6.3 km in North-West direction (NNW) of the main crater at a depth of 2 km.
Two thousand six hundred and sixty-seven (2667) earthquakes long period (LP) associated with the fluid dynamics inside the volcano, with reduced displacement values (RDC) less than 16cm2, were classified.

The images from the IP camera, showed the presence of small fumaroles during the month, reaching maximum heights of less than 100 meters above the main crater, maintaining a behavior considered as normal compared to recent months.
According to data obtained by two (2) electronic inclinometers (IE) on deformation measurement, a slight tilt can be observed towards the North, in the north of the main crater of the volcano, with the accumulation during the second half of months of inclination not exceeding 10μrad. The measurements show no significant changes linked to the activity of the volcano.

No abnormalities in sulfur dioxide (SO2) into the atmosphere from the volcanic field were not reported, according to data obtained by the ozone monitoring instrument.

Planchón-Peteroa

No heat alert was reported in the area associated with the volcano according to data released by the MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http://modis.higp.hawaii.edu/) and Mirova ( Middle InfraRed Observation of volcanic activity) on its website (http://www.mirovaweb.it/), two monitoring systems indicating major changes in the temperature of the surface of the earth.

There are no reports of local authorities or communities about perceived anomalies in the volcanic area.

planchon -peteroa

Seismic activity recorded in the period, which has spread more widely over the volcano showed a tendency to be more superficial, although the energy is low in the volcanic system. This may be due to the rise of a magma body apparently of low volume, which did not affect the hydrothermal system for the occurrence of surface activity and / or confined to small explosions in the crater.
Therefore, the volcanic alert remains at the LEVEL YELLOW and the exclusion zone of the population of 1 km around the active crater is proposed.

Source : Sernageomin

Photos : Volcanes de Chile

 

Copahue , Chile :

The level of activity of the volcano is at yellow level: changes in the behavior of volcanic activity likely date for an eruption weeks / months.

CopahueDuring this period, there were three hundred fifty nine (359) seismic events, in which fifteen (15) were classified as volcano-tectonic (VT) associated with a fracturing process .

Similarly , there had a hundred twenty  seven (127)  events related with fluid dynamics  within the volcanic edifice (named earthquakes long time, LP) and two hundred and seventeen (217) earthquakes of very long period (VLP ). It is distinguished a sudden increase in seismicity LP compared to previous months.

About VT seismicity, the local magnitude (ML) was less than or equal to M1,7. The higher energy event was located on the northeast side (NE), 14 km from the crater EL Agrio with a depth of 8 km.As regards the events related to fluid dynamics, LP events, they showed local magnitude (ML) below M1,0 and reduced displacement values (RDC) less than 1.2 cm2, while events VLP showed reduced displacement values (DRC) of 36.7 cm2, these events are found around the active crater.

During the period of this report, it was noted a constant tremor signal, oscillating, mainly associated with the gas outlet and sporadic emissions of ash particles from the El Agrio crater with DRC values of 0.5 cm2 for the entire period. The dominant frequencies were concentrated in a bandwidth between 1.2 and 2.0 Hz.

According to data from 3 GNSS stations, which measure the surface deformation of the volcano, it was noted that the horizontal and vertical components have low amplitude variations. Currently the control lines that cross the volcano, do not show significant variations due to the internal dynamics of the volcano, showing its stability during this last period.


Sulphur dioxide (SO2) recorded on the Copahue volcano by DOAS stations (spectroscopy Differential Optical Absorption) installed 5 km east – northeast (ENE) of the active crater, had a mean 808 ± 343 t / d and a maximum of 1 658 t / d recorded on 20 July. The average flow is considered moderate for this volcano.

IP cameras installed near the volcano experienced a constant degassing of the active crater (El Agrio)characterized most of the time by a gray coloration, demonstrating the presence of ash particles .It was sometimes possible to observed whiter coloration, indicating the predominance of the water vapor in the system. Similarly, it was possible to observe a night glow for several days.

No anomalies reported in sulfur dioxide (SO2) into the atmosphere from the volcanic edifice sector, according to data obtained by the OMI (Ozone Monitoring Instrument ) sulfur dioxide Group (http: // SO2 .gsfc.nasa.gov /) and NESDIS (National Environmental Satellite, Data, and Information Service (http://satepsanone.nesdis.noaa.gov).)

Thermal alerts in the area associated with the volcanic edifice during the month were recorded, most of them took place on 26 July, with a volcanic radiative power (RVP) of 3 MW, considered as a low value , according to data released by the Mirova system on its website (http://www.mirovaweb.it/), which is a thermal anomaly detection system based on MODIS data.

copahue

According to the described monitoring indicators, we can deduce that activity related to magmatic degassing of a system of low volume to shallow levels in interaction with the surface hydrothermal system in a low-level phase in the under a precarious balancing process continues. This activity can continue for a long time in swinging this way, without excluding specific activity increases expressed in small phreatic explosions or in the vicinity of the crater, by a small strombolian activity. Accordingly, we recommend the restriction of access to the proximal zone within a radius of 1.5 km around the crater El Agrio and is thus maintained the level of technical alert to yellow.

Source : Servicio Nacional de Geología y Minería (Sernageomin) , Réseau national de surveillance volcanique (RNVV) Observatoire volcanologique de los Andes de la South (OVDAS)

 

 

Mauna Loa , Hawai :

19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

 

mauna loa

Activity Summary: Rates of deformation and seismicity at Mauna Loa remain above long-term background levels.

Mauna Loa is not erupting. In the past week, earthquakes at Mauna Loa have occurred mostly in the south caldera and upper Southwest Rift Zone at depths less than 5 km (3 mi). Seismicity rates on Mauna Loa overall were about the same this week compared with the previous update, but remain elevated relative to the long-term background rate. Global Positioning System (GPS) measurements continue to show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone, with inflation occurring mainly in the southwestern part of the magma storage complex.

 

Source : HVO

 

 

Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
Eruptions continue at Kilauea Volcano’s summit and East Rift Zone. The 61G lava flow continues to flow into the sea at the Kamokuna ocean entry and has scattered breakouts on the coastal plain. The flow poses no threat to nearby communities. The lava lake at Halema’uma’u Crater continues to be active with a current height of 40 m (131 ft) below the Overlook crater rim. Seismicity and deformation rates remain at background levels throughout the volcano.

kilauea

 Summit Observations:
The lava lake within the Halema’uma’u Overlook crater continues to be active, with a current height of 40 m (131 ft) below the crater rim. Tiltmeters at Kilauea’s summit changed from recording deflationary to inflationary tilt at about 4:00PM HST yesterday, consistent with moving from the deflation to inflation portions of a DI event. The overall trend for the past several weeks has been slightly inflationary. Seismicity rates continue to be normal, with tremor fluctuations associated with lava lake spattering. The average daily summit sulfur dioxide emission rate ranged from 4,000 to 6,000 metric tons/day over the past week.

kilauea

Pu’u ‘O’o Observations:
Webcam images over the past 24 hours show persistent glow at long-term sources within the crater, indicating no significant changes. Seismicity and tilt records also showed no significant changes in the past day. The sulfur dioxide emission rate from all East Rift Zone vents was about 300 metric tons/day when measured on August 3.

 

kilauea

Lava Flow Observations:
The 61G lava flow, extending southeast of Pu’u ‘O’o on Kilauea’s south flank remains active. Scattered breakouts are occurring predominantly on the coastal plain and lava continues to flow into the ocean at the Kamokuna ocean entry. The length of coast comprising the active entry has ranged between 150 m (492 ft) and 240 m (787 ft) in the past week and the entire area presents a significant hazard to visitors (see below).

 

kilauea

As a strong caution to visitors viewing the new ocean entry (location where lava meets the sea) for Flow 61G, there are additional significant hazards besides walking on uneven surfaces and around unstable, extremely steep sea cliffs. Venturing too close to an ocean entry exposes you to flying debris created by the explosive interaction between lava and water. Also, the new land created is unstable because it is built on unconsolidated lava fragments and sand. This loose material can easily be eroded away by surf causing the new land to become unsupported and slide into the sea. Finally, the interaction of lava with the ocean creates an acidic plume laden with fine volcanic particles that can irritate the skin, eyes, and lungs.

Source : HVO

Photos : David Ford , Bruce OMORI

 

Klyuchevskoy , Kamchatka :

56.06 N, 160.64 E;
Elevation 15580 ft (4750 m)
Aviation Color Code is ORANGE

klyuchevskoy

Explosive-effusive eruption of the volcano continues. Ash explosions up to 26,240-32,800 ft (8-10 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

Explosive-effusive eruption of the volcano continues: there are bursts of volcanic bombs to 200-300 m above the summit crater and up to 50 m above the cinder cone into Apakhonchich chute, and strong gas-steam activity of two volcanic centers with emission of different amounts of ash, and the effusing of lava flows along Apakhonchich chute at the south-eastern flank of the volcano.

 

klyuchevskoy

According to satellite data by KVERT, a large bright thermal anomaly was observed at the area of the volcano all week, ash plumes drifted for about 200 km to the northeast, east and northwest from the volcano on 31 July and 01 and 03-04 August.

Source : Kvert

Photos : I.Borisov / Yu.Demyanchuk

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    Bonjour !
    Je peux utiliser certains de vos articles ?
    :p

    • ADMIN
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      Bonjour à vous.

      Bien sur que vous pouvez utiliser mes articles . Je vous demanderai simplement de citer « Le chaudron de vulcain  » en source, ainsi que les auteurs des photos .
      Cordialement.

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