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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Articles avec #actualites volcaniques catégorie

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
 Karangetang - pyroclastic flow of 7 May 2015 - Israel Lebang Photo / via Twitter

Karangetang - pyroclastic flow of 7 May 2015 - Israel Lebang Photo / via Twitter

The weekly report of the Global Volcanism Program of 29.04 - 05.05.2015 reports the observation by PVMBG of white plumes amount to 350 meters above the main crater of Karangetang, and to 25 meters above the crater II from 22 April 29.

Nocturnal glow marks the lava dome; lava flows began on April 22, resulting, depending on the topography, in glowing avalanches from the lava front of a casting, measuring 150 m long, having covered up to 2,000 meters towards drainages Batuawang and Kahetang between 22 and 29 April.

On April 26, a pyroclastic flow traveled 2,200 meters in Kahetang drainage. On April 28, explosions   generated plumes and ejected glowing material to 50 m high.

The site Mirova indicate a radiative activity since April 26, while the VSI remains the alert level  at 3 on a scale of 4 (since September 2013) / with advice not rise above 500 meters asl.

On May 7, at 14 pm, pyroclastic flows have marked the southern flank of Karangetang and destroyed homes in the village of Kora Kora, fortunately evacuated by its inhabitants.

 

Karangetang - incandescent avalanches 04.28.2015 / 6:21 p.m. - Doc. VSI Badan Geologi

Karangetang - incandescent avalanches 04.28.2015 / 6:21 p.m. - Doc. VSI Badan Geologi

Karangetang - pyroclastic flow and co-pyroclastic cloud of May 7, 2015 - photo Israel Lebang / via Twitter

Karangetang - pyroclastic flow and co-pyroclastic cloud of May 7, 2015 - photo Israel Lebang / via Twitter

Cumulative volcanic Energy for Karangetang in 2015 - Doc. VSI Badan Geologi

Cumulative volcanic Energy for Karangetang in 2015 - Doc. VSI Badan Geologi

 Diagram of Karangetang radiative power 05.08.2015 / activity of 26.04 to 06.05.- doc. Mirova

Diagram of Karangetang radiative power 05.08.2015 / activity of 26.04 to 06.05.- doc. Mirova

To the left, map of volcanic hazards of Karangetang - Doc. PVMBG - right, Karangetang's location on the island of SIAU to the north of Sulawesi  - one click to enlargeTo the left, map of volcanic hazards of Karangetang - Doc. PVMBG - right, Karangetang's location on the island of SIAU to the north of Sulawesi  - one click to enlarge

To the left, map of volcanic hazards of Karangetang - Doc. PVMBG - right, Karangetang's location on the island of SIAU to the north of Sulawesi - one click to enlarge

The Karangetang, also called Api Siau / the fire of Siau, is a stratovolcano peaking to 1784 meters, and wearing five summit craters aligned north-south.

Located on the island of Siau, north of Sulawesi, the volcano has had more than 40 major eruptions since records began in 1675.

In the 20th century, frequent explosive activity was accompanied by pyroclastic flows and lahars, and lava dome built in the summit craters. Pyroclastic flows have occurred in conjunction with the collapses of lava fronts. (GVP)

 

 

Silhouette of Karangetang, with its 5 craters and deep and shallow magma chambers - Local explanatory panel.

Silhouette of Karangetang, with its 5 craters and deep and shallow magma chambers - Local explanatory panel.

Sources:

- Médias locaux & Twitter - Facebook

- VSI - Badan Geologi - link

- MIROVA - Karangetang - link

- Global Volcanism Program - Karangetang (Api Siau)

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Bulusan summit - archive photo USGS / Newhall

Bulusan summit - archive photo USGS / Newhall

The Bulusan, located in the province of Sorsogon in the Philippine archipelago, is raising on alert 1 / abnormal, following an explosion May 6, 2015 at 9:46 p.m.. It lasted after 3.5 minutes depending on the seismic records. Initially from a vent on the upper northwest slopes, an ash plume rose to about 250 meters before drifting westwards. Ash falls were reported in Brgy. Bagsangan, Cogon, Monbon and Tinampo / Irosin, Sorsogon. This episode follows an explosion at the same vent on May 1, which lasted 5 minutes.
This type of explosion is typical of Bulusan during periods of rest, when disruptions mark the hydrothermal system, or when the steam pressure builds up on a superficial level.
A "no-go" 4 km-radius zone was established.
The situation is not favorable to the approach of the archipelago by the Dodong typhoon, the rain could mobilize the ash deposits.


Sources:
Phivolcs
CNN Philippines

Bulusan location in the  Philippine archipelago

Bulusan location in the Philippine archipelago

Bulusan hazards map / GVP

Bulusan hazards map / GVP

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The alert level of Hakone volcano, on the island of Honshu in Japan,  was raised to 2, following an increase in seismic activity on 6 may ; 140 volcanic earthquakes were recorded by the JMA, including two of magnitude 2.0 and 2.4. On May 5, three minor earthquakes shook the city of Hakone Yumoto, while steam was observed at around Owakudani hot springs, popular site visited by tourists, who go there to consume a local specialty, Kuro- tamago, eggs cooked in hot springs, with blackened shells, supposed to increase longevity.

On Monday, four major trails had been closed by the operators of the Hakone Ropeway; the road to Owakudani was closed today, and a 300 meters radius area evacuated. The Owakudani valley, whose name means " Great boiling valley  ", is part of the Hakone chain; it was formed there about 3,000 years during an eruption of the volcano.

(Views of Japan)

The geothermal area of Owakudani - photo undisclosed Tv

The geothermal area of Owakudani - photo undisclosed Tv

Map of Hakone's somma - withe the lake Ashi and the touristic zones

Map of Hakone's somma - withe the lake Ashi and the touristic zones

The Hakoneyama is truncated by two  overlapping  calderas, the largest 10 km of 11, formed during major eruptions  there are 180,000 and 49,000 to 60,000 years. Lake Ashi  is between the southwest wall of the caldera and a half dozen of post-caldera lava domes;  they was formed subsequent to the formation of a dam on Hayakawa Valley, following  an eruption and a collapse 3,000 years ago. The last identified  eruption of the Hakone volcano concerns Owakudani and is dated  from the 1170 ± 100 year. (Global Volcanism Program - Hakoneyama)

Villarica 05.05.2015 - night glow - photo Sernageomin / Twitter

Villarica 05.05.2015 - night glow - photo Sernageomin / Twitter

In Chile, the Villarica has a permanent nocturnal glow, accompanied by a throbbing, diffuse degassing. The volcanic system shows a stable trend, with little or no strombolian activity ... however the alert level remains at orange / probable eruption in terms of days or weeks, with a restriction zone of 5 km around the crater and hazardous areas defined by 200 meters either side of drainage, for possible lahars having the ability to move at speeds of around 100hm / h.

Sinabung, the lava lobe on 05.05.2015 /17h08 -photo endrolew@

Sinabung, the lava lobe on 05.05.2015 /17h08 -photo endrolew@

Usual activity at the Sinabung / Sumatra … the active reconstruction cycle of the lava lobe after collapse and pyroclastic flow continues.

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Earth 55 Cancri e and Earth compared in this artist proof - Doc.55 Cnc e / NASA exoplanet archive

Earth 55 Cancri e and Earth compared in this artist proof - Doc.55 Cnc e / NASA exoplanet archive

55 Cancri e is a "super-Earth", a rocky exoplanet orbiting the star 55 Cancri A, a yellow dwarf located about 40 light years of the sun in the constellation of Cancer. Discovered in 2004, it has a mass of 10.8 MT (more than 10 times the land mass); its surface gravity would be three times more intense than on Earth. She is so close to its star that its year lasts only 18 hours.

The first observations of 55 Cancri e pointing a carbon-rich composition, which earned him his nickname "diamond planet". The changes observed since and never seen elsewhere, leave us skeptical.

Transits on the Sun and 55 Cancri A / respective passages of the Earth and Jupiter vs. that of 55 Cancri e - Credit: Jason Rowe / NASA Ames and the SETI Institute and Jaymie Matthews / UBC

Transits on the Sun and 55 Cancri A / respective passages of the Earth and Jupiter vs. that of 55 Cancri e - Credit: Jason Rowe / NASA Ames and the SETI Institute and Jaymie Matthews / UBC

Orbital distances and relative size of four innermost planets orbiting the star 55 Cancri A (below) and of 3 planets of our solar system and its star (top) - Doc. astrobio.net

Orbital distances and relative size of four innermost planets orbiting the star 55 Cancri A (below) and of 3 planets of our solar system and its star (top) - Doc. astrobio.net

 "The road to the exoplanet 55 Cancri e" - map Stellarium and Prof. Jaymie Matthews / UBC

"The road to the exoplanet 55 Cancri e" - map Stellarium and Prof. Jaymie Matthews / UBC

Researchers at the Institute of Astronomy of the University of Cambridge observed, using the Spitzer Space Telescope of NASA, thermal emissions from the planet, and noted differences on the day side of it, going from 1000 to 2700 °C.

Although the interpretation of these data is still in its early stages, the researchers believe that the temperature variability could be due to gas plumes and dust that cover its surface, maybe partially molten. These plumes could be caused by strong volcanic activity subject to the interactions of tides, much stronger than that observed on Io, one of Jupiter's moons.

55Cancri e artist Views, showing a hot and partially melt surface of the exoplanet, before and after a potential volcanic activity on his day side - pictures R.Hunt

55Cancri e artist Views, showing a hot and partially melt surface of the exoplanet, before and after a potential volcanic activity on his day side - pictures R.Hunt

Whether or not composed of diamonds, 55 Cancri e is still a future mine of interesting discoveries ... to follow.

 

Sources :

- Astronomers find first evidence of changing conditions on a super Earth - link

- Variability in the super-Earth 55 Cnc e / Monthly Notices of the Royal Astronomical Society / by B-O Demory,M.Gillon, N.Madhusudhan, D.Queloz - link

- Volcanic Activity on Super Earth 55 Cancri e - link

- 55 Cnc e / Nasa exoplanet archive - link

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Turrialba - eruption of 4.5.2015 - photo Paul Lachner / via RSN

Turrialba - eruption of 4.5.2015 - photo Paul Lachner / via RSN

The Turrialba experienced yesterday, 05.04.2015, a strong eruption, starting at 15h24 which generated a rising ash plume 2,500 meters vertically above the crater, according OVSICORI. The episode lasted 23 minutes.

The eruption was accompanied by tremor and expulsion bombs 3 to 4 kg. Up to one kilometer from the crater.

 

Turrialba - 04.05.2015 / 3:24 p.m. - the arrows indicate the presence of bombs ejected at high speed - Doc. Ovsicori

Turrialba - 04.05.2015 / 3:24 p.m. - the arrows indicate the presence of bombs ejected at high speed - Doc. Ovsicori

Turrialba - the eruptive plume seen by the webcam Irazu, at 3:25 & 3:38 p.m. - Doc. Ovsicori - a click to enlarge.Turrialba - the eruptive plume seen by the webcam Irazu, at 3:25 & 3:38 p.m. - Doc. Ovsicori - a click to enlarge.

Turrialba - the eruptive plume seen by the webcam Irazu, at 3:25 & 3:38 p.m. - Doc. Ovsicori - a click to enlarge.

L’Institut météorologique informe du déplacement des cendres vers le sud-ouest  du volcsn, la Valle Central et le Pacifique.

Strong eruption in Turrialba / Costa Rica

Sources :

- OVSICORI

- RSN - Red Sismologica Nacional

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

Axial seamount, an active underwater volcano located 300 miles off the coast of Oregon and Washington in the western United States, seems to be erupting late April ... according to the prediction made in last September by the geologists Bill Chadwick  / Oregon State University - OSU, and Scott Nooner / North Carolina Wilmington University.
 

Axial Seamont - bathymetry (exaggerated) of the submarine volcano - Doc. NOAA

Axial Seamont - bathymetry (exaggerated) of the submarine volcano - Doc. NOAA

Axial Seamont location on the Juan de Fuca Ridge - Doc. NOAA & GVPAxial Seamont location on the Juan de Fuca Ridge - Doc. NOAA & GVP

Axial Seamont location on the Juan de Fuca Ridge - Doc. NOAA & GVP

They based their prediction on the inflation model of the ocean floor before, during and after the eruption since 1998.

Since last Friday, a swarm of earthquakes marks the seamount, a sign of magma movements towards the surface; these earthquakes, and declining level of 2.4 meters from the ocean floor, indicating that magma was removed from the magma chamber beneath the summit, suggest an activity.

According to Chadwick, "
It isn’t clear yet whether the earthquakes and deflation at Axial are related to a full-blown eruption, or if it is only a large intrusion of magma that hasn’t quite reached the surface ... There are some hints that lava did erupt, but we may not know for sure until we can get out there with a ship. " An expedition is scheduled for August ... it may be advanced in May.

Eruptive vent of Axial Seamont - photo Bill Chadwick / OSU / 2011

Eruptive vent of Axial Seamont - photo Bill Chadwick / OSU / 2011

Axial seamount is an ideal laboratory for scientists, because of its proximity to the NW coast of the United States, and its unique structure.

Located on a thin portion of oceanic crust, the plumbing system is simpler than that of most land volcanoes. In 2006, Chadwick and Nooner had declared that an eruption could occur there before 2014 ... that was in 2011 !  Since last eruption, they have refined their forecasts and announced an eruption for 2015, based on an increase in the inflation ratio of 400% since.


"We’ve learned that the supply rate of magma has a big influence on the time between eruptions," Nooner said. "When the magma rate was lower, it took 13 years between eruptions. But now when the magma rate is high, it took only four years"

Plot of the long-term time-series of inflation/deflation at the center of Axial Caldera on which the 2015 forecast was based, updated with the 2015 eruption in orange (using OOI Cabled Array data). - doc. NOAA / PMEL

Plot of the long-term time-series of inflation/deflation at the center of Axial Caldera on which the 2015 forecast was based, updated with the 2015 eruption in orange (using OOI Cabled Array data). - doc. NOAA / PMEL

Sources :

- OSU / 30.04.2015 - Researchers think Axial Seamount off Northwest coast is erupting – right on schedule - link

- NOAA  / PMEL - Successful forecast of the 24 April 2015 eruption at Axial Seamount - link

- OSU / 2011 - Scientists find eruption at undersea volcano - after forecasting the event

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
The third explosive eruption of Calbuco on 30/04/2015 - photo Mario Ruiz / EPA

The third explosive eruption of Calbuco on 30/04/2015 - photo Mario Ruiz / EPA

After a few days more peaceful and of small plumes of gas and ash, Calbuco had its third significant explosive eruption on 30/04/2015 at 1:08 p.m. local (4:08 p.m. GMT), preceded 10-15 minutes before by a peak of tremor. The eruption was weaker than the previous two, but still accompanied with a gray ash plume loaded 3-5000 meters high, dispersing to the southeast.

Possible pyroclastic flows are causing small lahars in the Rio Blanco south. The pyroclastic material accumulated on the upper parts of the volcano could be remobilized by rain and give rise to secondary lahars.


 

The ash plume of Calbuco and Puerto Montt - photo Francesco Negroni / AP 30/04/2015

The ash plume of Calbuco and Puerto Montt - photo Francesco Negroni / AP 30/04/2015

Calbuco : the ash cloud on Cochamó 04/30/2015 - photo Meteorologica / Twitter

Calbuco : the ash cloud on Cochamó 04/30/2015 - photo Meteorologica / Twitter

NASA has provided a compilation of data about sulfur dioxide emitted between 23 and 29 April, translated by a picture showing the drift of the gas plume towards the northeast and east.

Eruption of Calbuco - Doc. compilation of sulfur dioxide AIRS data from April 23-29, 2015, showing the Calbuco plume spreading eastward. NASA

Eruption of Calbuco - Doc. compilation of sulfur dioxide AIRS data from April 23-29, 2015, showing the Calbuco plume spreading eastward. NASA

Sources :

- SERNAGEOMIN - rapport du 30.04.2015

- Nasa doc. AIRS dispersion du SO2

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
The Piton de la Fournaise - seen by the satellite EO-1 ALI NASA / Caption by Michon Scott.

The Piton de la Fournaise - seen by the satellite EO-1 ALI NASA / Caption by Michon Scott.

The Piton de la Fournaise on the island of La Reunion, is on alert level 1 / probable eruption.

After a week of recording a deep volcano-tectonic activity (between 6 and 2 km below the sea level), the OVPF recorded an increase in activity in the superficial part of the building (400 to 1000 m above sea level) since Sunday, 26 April 2015.

Consequently, the OVPF suggested the change to the level of alert. The Prefecture of La Réunion decided to switch to Alert 1 (probable eruption) at 6:00 am on 29.4.2015. L'Enclos is no longer accessible!

For the day of April 29 between 0:00 and 12:30 TU TH (between 4:00 local and local 16.30), the networks have recorded:
  - 
57 volcano-tectonic earthquakes summital (either by extrapolating more than 100 per 24 hours).
 
- 8 deep volcano-tectonic earthquakes.
  - 
a constant deformation.
  - 
Flow constant of magmatic gases; measurements made at Pas de Bellecombe show a clear increase of the CO2 stream in surface consistent with the recording of deep earthquakes.

 

 

 Piton de la Fournaise - Location of earthquakes between 13 and 28.04.2015 - Doc. OVPF

Piton de la Fournaise - Location of earthquakes between 13 and 28.04.2015 - Doc. OVPF

 The Piton de la Fournaise and Gunung Dempo in raised alert.

Source :

IPGP / OVPF - actualités - link

In Sumatra, the VSI has increased the level of alert of Gunung Dempo to 2 / Waspada, on 29 April 2015 / 16 h00.

Seismicity of the volcano has increased, raising fears of a potential eruption phreatic type, a type of sudden and violent eruption which is customary that volcano. The VSI advised not to approach within a kilometer of the active crater, a potentially dangerous area.


 

 The acid lake on summit of Gunung Dempo - photo indovolcano

The acid lake on summit of Gunung Dempo - photo indovolcano

Seismicity chart of Gunung Dempo between 01.01.2015 and 29.04.2015 - Doc. PVMBG

Seismicity chart of Gunung Dempo between 01.01.2015 and 29.04.2015 - Doc. PVMBG

The Dempo is a stratovolcano overlooking the Pasumah plain, in the southeast of Sumatra. This andesitic complex is  wearing two summits, Gunung Dempo / 3,049 m. and Gunung Marapi Dempo / 3.173 m., established in the SE edge of a caldera 3 km wide on 5, breached to the north. (Not to be confused with the Marapi volcano, located 500 km. NW of Sumatra more).

Remains of seven craters are found near the top of the complex; the largest of 800 on 1,100 meters, crosses the northwest flank of Gunung Dempo Marapi, and contains an acid lake of 400 meters in diameter.

Historical eruptions of Dempo are recorded since 1818; one counts 21, separate by highly variable rest period between one and 26 years. The last eruption from 1 January 2009.

 

To the left, the Location of G.Dempo near the Sumatran Fault - Doc. Oregonstate univ. - Right, partial view of the top of G.Dempo - photo indovolcanoTo the left, the Location of G.Dempo near the Sumatran Fault - Doc. Oregonstate univ. - Right, partial view of the top of G.Dempo - photo indovolcano

To the left, the Location of G.Dempo near the Sumatran Fault - Doc. Oregonstate univ. - Right, partial view of the top of G.Dempo - photo indovolcano

Sources:

- VSI Badan Geologi - link

- Global Volcanism Program - Dempo

- IndoVolcano - Gunung Dempo

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

After a news shaken by earthquakes of Nepal, recovery of the review of a relatively quiet volcanic actuality.

In Mexico, Colima  introduced several explosions on 28.04,  accompanied by plumes rising to 3,000 meters for some. Ash fallout is expected on Tuxpan, Zapotiltic, Tamazula and Ciudad Guzmán.

 

Colima - plume rising to 3,000 meters 28.041.2015 / 10:01 - photo Proteccion Civil Jalisco

Colima - plume rising to 3,000 meters 28.041.2015 / 10:01 - photo Proteccion Civil Jalisco

In Ecuador, a clearing on 27.04 allowed to see a small plume of ash emited by the Tungurahua. The webcams do not much revealed in recent days, the summit is often under the clouds.

 

Tungurahua - 04.27.2015 / 16:30 - picture José Luis Espinosa Naranjo

Tungurahua - 04.27.2015 / 16:30 - picture José Luis Espinosa Naranjo

In Sinabung / Sumatra, a collapse of the dome caused a significant pyroclastic flow on 28.04, which buried in passing the village of Guru Kinayan, and reaches the river Lau Borus with a secondary explosion in the meeting with the waters.

Sinabung - pyroclastic flow of 28.04.2015 / 5:34 p.m. - photo Endrolew @

Sinabung - pyroclastic flow of 28.04.2015 / 5:34 p.m. - photo Endrolew @

Sinabung - The cloud is close to residential areas - photo 2015.04.28 / 6:30 p.m. / Jefri Sembiring

Sinabung - The cloud is close to residential areas - photo 2015.04.28 / 6:30 p.m. / Jefri Sembiring

Sinabung - The pyroclastic flow reached the Lau Borus river - photos 04.28.2015 / 7:52 & 8:01 p.m.  by Sadrah ps.
Sinabung - The pyroclastic flow reached the Lau Borus river - photos 04.28.2015 / 7:52 & 8:01 p.m.  by Sadrah ps.

Sinabung - The pyroclastic flow reached the Lau Borus river - photos 04.28.2015 / 7:52 & 8:01 p.m. by Sadrah ps.

 Lau Borus this morning - photo Sadrah ps 29/04/2015

Lau Borus this morning - photo Sadrah ps 29/04/2015

Sinabung - The pyroclastic flow past on the village of Guru Kinayan the 28.04 evening - photo Sadrah ps 29/04/2015

Sinabung - The pyroclastic flow past on the village of Guru Kinayan the 28.04 evening - photo Sadrah ps 29/04/2015

The vicinity of Sinabung under the ashes this morning - photo Sadrah ps 29/04/2015

The vicinity of Sinabung under the ashes this morning - photo Sadrah ps 29/04/2015

In the Canary Islands, the Avcan reported a seismic swarm in the Güimar valley on Tenerife Island on 28.04 from 4:55. Thirteen earthquakes were recorded at about 30 km depth, indicating a possible deep magmatic intrusion in the central area of ​​the valley, under the volcano Arafo.

 

Tenerife - Location of the last 10 earthquakes in the Güimar Valley on 04/28/2015 - Doc. Avcan

Tenerife - Location of the last 10 earthquakes in the Güimar Valley on 04/28/2015 - Doc. Avcan

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
The ash plume of Calbuco seems to animate the statue - Photo of Chantel Henderson / BBC News

The ash plume of Calbuco seems to animate the statue - Photo of Chantel Henderson / BBC News

The Research Institute of Geology and Paleobiology of the National University of Rio Negro / UNRN completed its first petrographic analysis of ash from the eruption of Calbuco. Four samples were taken and analyzed by UNRN.

 


The ash is light brown to light gray; it has grain size below 250 microns, consisting of glassy and crystalline flakes apart. There are more pollen grains of uncertain origin.

Glassy shards, the main component of the grains are of two types: shredded or porous as pumice. The jagged glass shards are angular and compact, with a smaller proportion in the form of stars or with walls having bubbles. Porous shards are rarer than the previous ones, and vesicular with abundant inclusions of micro-
phenocrysts.

The crystals are angular and predominantly of plagioclase and hornblende, with a smaller proportion of quartz and biotite. Accessory minerals are present: apatite and zircon. On the basis of mineralogy, and depending on the classification QAPF, ash can be described as andésito-dacitic. Of the chemical viewpoint, the ash is acid and average silica content.

These results should be supplemented by more detailed analyzes in the coming days.

 

Petrographic analysis of the ashes of Calbuco - a / ash sample under a microscope - scale 250μ - b / vitreous shard in block - c / shard with bubble in the wall - d / shard in star form - e / porous shine with small channels of exhaust gas - the scale to b-c-d: 50 μ, for e and f: 25μ. - Doc. Geologia in the UNRN.

Petrographic analysis of the ashes of Calbuco - a / ash sample under a microscope - scale 250μ - b / vitreous shard in block - c / shard with bubble in the wall - d / shard in star form - e / porous shine with small channels of exhaust gas - the scale to b-c-d: 50 μ, for e and f: 25μ. - Doc. Geologia in the UNRN.

2015.05.24 - the ashes of Calbucoin 2015, left - versus those of  Puyehue in 2011, right - Doc. Tomás Heller / Twitter

2015.05.24 - the ashes of Calbucoin 2015, left - versus those of Puyehue in 2011, right - Doc. Tomás Heller / Twitter

The ash cloud continues to affect the region of lakes and Valparaiso, now at 2 km altitude in south-central Chile, and between 8 and 12 km altitude on Chile center. The ash particles encountered at an altitude of 2 km are moving to the east and the Argentine sector.
Telesur reported that the ashes will soon reach Buenos Aires.Des flights to the Argentine capital were removed preventively.

Ash cloud of the Calbuco - Satellite Image 24.05.2015 /  3:34 LT, 5:34 UTC - via CIMAT

Ash cloud of the Calbuco - Satellite Image 24.05.2015 / 3:34 LT, 5:34 UTC - via CIMAT

The ash cloud of Calbuco seen from Argentina, Llao Llao area / Bariloche - Photo SERNAGEOMIN / Twitter

The ash cloud of Calbuco seen from Argentina, Llao Llao area / Bariloche - Photo SERNAGEOMIN / Twitter

On the ground, the traffic is made very difficult and requires utilisation of scraper type leveling gear. The layer of ash and lapilli is important and requires the cleaning of roofs to prevent collapses.
 

 Roads should be open by a scraper for circulation - 04.24.2015 / via CIMAT

Roads should be open by a scraper for circulation - 04.24.2015 / via CIMAT

On the left, clearing of roofs to Ensenada 04.23.2015 - Photo-Pablo Sanhueza Gutierrez / AP / weather.comnews - right, the roof of a restaurant collapsed under the weight of ash to Puerto Varas- Photo-Luis Hidalgo / AP /weather.comnewsOn the left, clearing of roofs to Ensenada 04.23.2015 - Photo-Pablo Sanhueza Gutierrez / AP / weather.comnews - right, the roof of a restaurant collapsed under the weight of ash to Puerto Varas- Photo-Luis Hidalgo / AP /weather.comnews

On the left, clearing of roofs to Ensenada 04.23.2015 - Photo-Pablo Sanhueza Gutierrez / AP / weather.comnews - right, the roof of a restaurant collapsed under the weight of ash to Puerto Varas- Photo-Luis Hidalgo / AP /weather.comnews

SERNAGEOMIN reports that pyroclastic flows reached a distance of 7 km and channeled lahars traveled to 15 km from the volcano, and caused an increase in the level of the Rio Blanco.

A survey by helicopter showed that the Calbuco now has 6 active vents located at the place of the old dome; a thermal anomaly is reported, described by Mirova as moderate. Harmonic tremor is reported to 2:38 p.m. on 24.04, and a plume of 2,000 meters at most.

The Onemi has ordered new evacuations by flood fear of the Rio Correntoso. The number of evacuees amounted to 6.514 (official figures 24.05.2015 / 16h

 

Photos of the summit made during an overflight by SERNAGEOMIN - 24.05.32015 on Twitter

Photos of the summit made during an overflight by SERNAGEOMIN - 24.05.32015 on Twitter

 Photos of the lahars on the Rio Blanco during an overflight by SERNAGEOMIN - 24.05.32015 on Twitter

Photos of the lahars on the Rio Blanco during an overflight by SERNAGEOMIN - 24.05.32015 on Twitter

Sources :

- Sernageomin & Onemi

- Médias cités

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