Overblog
Suivre ce blog Administration + Créer mon blog

Earth of fire

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

actualites volcaniques

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The eruption of Pavlof, which began on November 12, intensified on November 14, bringing the aviation code to Red and the volcanic alert to Warning.
 

Pavlof: Modis An image showing the extension of the cloud over 400 km at an estimated altitude of at least 10,600 meters. - Image Daveschneider / AVO-USGS

Pavlof: Modis An image showing the extension of the cloud over 400 km at an estimated altitude of at least 10,600 meters. - Image Daveschneider / AVO-USGS

The tremor remains at a high level. The ash plume rises about 9,000 meters after the pilot report (11.14.2014 / 24:30) before moving to north-west over the Bering Sea. A Modis image shows an extension of the cloud over 400 km at an estimated altitude of at least 10,600 meters. The ash cloud is moving away from populated areas, and no ash fall is reported by the locals.





Pavlof - movement of the ash cloud 16.11.2014 / 5:32 UTC - Doc. NOAA / National weather Service

Pavlof - Tremor  on 11/15/2014 - Doc. AVO USGS

Pavlof - Tremor on 11/15/2014 - Doc. AVO USGS

Pavlof - movement of the ash cloud 16.11.2014 / 5:32 UTC - Doc. NOAA / National weather Service

Pavlof - movement of the ash cloud 16.11.2014 / 5:32 UTC - Doc. NOAA / National weather Service

Source :

Alaska Volcano Observatory

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The Volcanodiscovery site reports a moderate to low explosive activity at two different vents in the middle of the lava dome of the volcano Ibu , located on the island of Halmahera in the Moluccas archipelago, on 12 and 13 November.

Ibu - strombolian explosion starting from a vent on the lavadome - photo Volcanodiscovery / Twitter 14/11/2014

Ibu - strombolian explosion starting from a vent on the lavadome - photo Volcanodiscovery / Twitter 14/11/2014

 Volcano Ibu :crater and dome - photo Arnold Binas 2010 / GVP

Volcano Ibu :crater and dome - photo Arnold Binas 2010 / GVP

 Location Ibu volcano, left - right, the inner crater and the lava dome - photo Bruce Gemmell - PT Nusa Halmahera minerals - A click to enlarge Location Ibu volcano, left - right, the inner crater and the lava dome - photo Bruce Gemmell - PT Nusa Halmahera minerals - A click to enlarge

Location Ibu volcano, left - right, the inner crater and the lava dome - photo Bruce Gemmell - PT Nusa Halmahera minerals - A click to enlarge

The Ibu stratovolcano has a truncated summit, housing two nested craters. The outer crater, 1,200 meters wide, is breached on its north side. The inner crater, 1,000 meters wide and 400 meters deep, has its floor covered in large part by a lava dome, which was set up in December 1998.

At the active vents, the vent further south is surrounded by a
recent-looking cinder cone  of 60 m. wide and 30 m. High, producing explosions at intervals of 20-30 minutes. They seem to come, according to a field observation, from a vent located in the crater of the cone, and ejected both white vapor that plumes of ash, or tephra. The ash plumes form, sometimes in collapsing, small pyroclastic flows on the western slopes of the cone. A small incandescent is reported at night.

A second vent, north of the cinder cone, is characterized by Strombolian explosions, the issue of incandescent bombs at a height of 100-200 meters, and ash plumes rising to over 500 meters.

A possible third vent near the second is marked by phases of intense degassing of short duration.
Accompanied by loud jet-engine like sounds, a dense steam plume was erupted, followed by dilute ash at the end of the degassing event..


The last eruption of the volcano Ibu began, according to the Global Volcanism Program, on April 5, 2008 and is still ongoing.

Eruption underway at Ibu volcano - Picture above: 08.09.2009 by Toffoli & M.Rietze - photo below: Summer 2012, by Pascal Blondé.
Eruption underway at Ibu volcano - Picture above: 08.09.2009 by Toffoli & M.Rietze - photo below: Summer 2012, by Pascal Blondé.

Eruption underway at Ibu volcano - Picture above: 08.09.2009 by Toffoli & M.Rietze - photo below: Summer 2012, by Pascal Blondé.

Sources:

- Volcanodiscovery - Ibu volcano (Halmahera, Indonesia) activity update & field observations: mild to moderate explosive activity at lava dome - link

- Global volcanism Program - Ibu

- Pascal Blondé - Moluques été 2012 et novembre 2013 - link

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The Monowai seamount, located in the Pacific Ocean midway between the group of Tonga and Kermadec isles 1500 km northeast of New Zealand, has erupted three times in the second half of the month October 2014, each time for a few days.

 Situation of the Monowai seamount north of the Kermadec volcanic arc - NOAA map

Situation of the Monowai seamount north of the Kermadec volcanic arc - NOAA map

Surface debris produced by an eruption of Monowai seamont on October 31, 2014 - doc.RNZAF / GeoNet

Surface debris produced by an eruption of Monowai seamont on October 31, 2014 - doc.RNZAF / GeoNet

A report by the volcanologist Brad Scott, of GeoNet / New Zealand, gives us the means to detect this kind of submarine eruption distant from the land: erupting, a submarine volcano produced an unusual seismic wave, called "T-wave ", that spreads well in the oceans.

T-waves from Monowai were recorded by a seismograph in Rarotonga, 2000 km away to the east in the Cook Islands and in French Polynesia. These observations were confirmed visually by an aircraft flying over the area of Monowai on October 31, when the production of a third wave of T-wave.

 

Records of three T-wave periods detected in Rarotonga corresponding to the periods of high activity in October 2014 - Doc. GeoNet

Records of three T-wave periods detected in Rarotonga corresponding to the periods of high activity in October 2014 - Doc. GeoNet

More about the Monowai :

This is one of the most active submarine volcanoes in the southwest Pacific.

It consists of a large oval caldera 11 km  x8.5, 1,500 meters deep, where hydrothermal activity is reported. On its southwestern edge, stands a stratovolcano, 1,000 meters high and a basae width over 10 km. Small parasites cones punctuate its northern and western flanks. The total is estimated at more than 500 km² in surface.



The caldera and cone Monowai - Doc. top: courtesy of Wright and others, 2008 / GVP - do. bottom: courtesy of Ian Wright, 2005 (NIWA; http oceanexplorer.noaa.govexplorations05fire).

The caldera and cone Monowai - Doc. top: courtesy of Wright and others, 2008 / GVP - do. bottom: courtesy of Ian Wright, 2005 (NIWA; http oceanexplorer.noaa.govexplorations05fire).

The depth of the climax of Monowai varied between 1997 and 2007 meters and -128 -49 meters from the bathymetric surveys.
Monowai bathymetries between 2004-2011- Evolution of the morphology and depth of the climax. - Doc.courtesy of Watts and others (2012). GVP in

The caldera and cone Monowai - Doc. top: courtesy of Wright and others, 2008 / GVP - doc. bottom: courtesy of Ian Wright, 2005 (NIWA; http oceanexplorer.noaa.govexplorations05fire).
The caldera and cone Monowai - Doc. top: courtesy of Wright and others, 2008 / GVP - doc. bottom: courtesy of Ian Wright, 2005 (NIWA; http oceanexplorer.noaa.govexplorations05fire).

The caldera and cone Monowai - Doc. top: courtesy of Wright and others, 2008 / GVP - doc. bottom: courtesy of Ian Wright, 2005 (NIWA; http oceanexplorer.noaa.govexplorations05fire).

The depth of the highest point of the Monowai varied between 1997 and 2007 between -128 meters and -49 meters, from the bathymetric surveys.

Monowai bathymetries between 2004-2011- Evolution of the morphology and depth of the highest point - Doc.courtesy of Watts and others (2012). in GVP.

Monowai bathymetries between 2004-2011- Evolution of the morphology and depth of the highest point - Doc.courtesy of Watts and others (2012). in GVP.

Since its characterization as a volcano in 1977, many eruptions have been detected by underwater acoustic signals. In August 2012, the eruptive activity is recorded by seismographs of Rarotonga. The activity of 2014 seems less important than that recorded in 2009 and 2012.

Discoloration of the surface water, a vigorous gas bubbling or areas of turbulence are also observed.

To the left, the 3D image of Monowai - Doc Chadwick, WW, et al. (2008) via GeoNet -to the right, growth to southern of the Monowai cone from 1978 to 2011 - Doc. Watts and others (2012) in GVP - a  click to enlarge.To the left, the 3D image of Monowai - Doc Chadwick, WW, et al. (2008) via GeoNet -to the right, growth to southern of the Monowai cone from 1978 to 2011 - Doc. Watts and others (2012) in GVP - a  click to enlarge.

To the left, the 3D image of Monowai - Doc Chadwick, WW, et al. (2008) via GeoNet -to the right, growth to southern of the Monowai cone from 1978 to 2011 - Doc. Watts and others (2012) in GVP - a click to enlarge.

Despite its remoteness, the seamount is monitored as likely to be in the future the site of phreatomagmatic eruptions, generating such significant ash plumes ... on the layout of roads frequented by aircraft, or to present flank collapses associated with risk of tsunamis.

 

Sources : 

- GeoNet - Remote sensing of submarine eruptions at Monowai volcano - link

- Global Volcanism Program  - Monowai

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
The lava field Holuhraun in a sandstorm on 2014.11.08 - photo Einar Gudmann / Barcroft Media

The lava field Holuhraun in a sandstorm on 2014.11.08 - photo Einar Gudmann / Barcroft Media

The eruptive fissure at Holuhraun emits amount of SO2 gas - Einar Gudmann / Barcroft Media 11/08/2014

The eruptive fissure at Holuhraun emits amount of SO2 gas - Einar Gudmann / Barcroft Media 11/08/2014

The eruption in the Holuhraun field continues with the same intensity as in previous weeks. The lava field reaches on 10 November an area of 70 km².

Pollution caused by gases emitted by the eruption continues to affect air quality; affected areas on Monday and Tuesday are located in the west and northwest of Iceland.

Film by: JonGustafsson.com at ArtioFilms.com - Music by: Veigar Margeirsson Veigar.com - Pilot: Reynir Freyr Petursson / Reykjavik Helicopters.com

Last map of the lava field Holuhraun - Doc. IES 11/08/2014

Last map of the lava field Holuhraun - Doc. IES 11/08/2014

The lava field Holuhraun - photo Iceland Magazine 11.10.2014 / via Twitter

The lava field Holuhraun - photo Iceland Magazine 11.10.2014 / via Twitter

In Bárðarbunga, seismic activity remains intense, with 200 earthquakes since November 7, in which 20 of the caldera of a magnitude between 4.0 and 5.0. The largest quake was recorded on November 9 at 9:19 p.m. of magnitude 5.2.

Subsidence of the caldera continues at the same rate as in the previous weeks.


 

Subsidence of the caldera Bárðarbunga of 8 to 11 November 2014 - Number and magnitude of earthquakes on the same dates - Doc. IES

Subsidence of the caldera Bárðarbunga of 8 to 11 November 2014 - Number and magnitude of earthquakes on the same dates - Doc. IES

Sources :

- Conclusions of the Scientific Advisory Board of the Icelandic Civil Protection / 10.11.2014, 11:00 UTC

- IES

- Icelandic Met Office

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Chiles volcano, seen from NO, leaving see no modification in surface - photo IGEPN 11/05/2014

Chiles volcano, seen from NO, leaving see no modification in surface - photo IGEPN 11/05/2014

The IGEPN and Pasto Volcano Observatory shows an average of 6,200 earthquakes daily, with the main epicenters under the area called "El Artezón", southeast of the volcano Chiles.

Most earthquakes are small in magnitude, less than 3 on the Richter scale; two strongest earthquakes were felt the 20.10 of M5,9, and 29.10 of M4,7, felt in the towns of Tufiño, Chiles (Colombia), Johannesburg, The Angel, San Isidro and La Libertad. The total number of earthquakes since September 29 amounted to over 130,000 events.

After the earthquake of October 20, data from GPS stations, as well as radar interferometry images taken by the satellite of the Italian Space Agency, show little change ... the maximum deformation is 23 cm.

An analysis of parameters of the hotsprings Potrerillos, El Arteson and Aguas Hediondas, as well as "lagoons Verdes", indicate high temperatures and conductivity for the first three.

Number of earthquakes in Cerro Negro - Chiles area between September 29 and October 30 - Doc. OVSP-SGC / IG-EPN

Number of earthquakes in Cerro Negro - Chiles area between September 29 and October 30 - Doc. OVSP-SGC / IG-EPN

Location of hot springs and landslides post earthquake of October 20 and measured parameters / Ubicación y algunos de fuentes termales slidings producidos después del 20 de octubre del earthquake. / Doc.OVSP-SGC / IG-EPN
Location of hot springs and landslides post earthquake of October 20 and measured parameters / Ubicación y algunos de fuentes termales slidings producidos después del 20 de octubre del earthquake. / Doc.OVSP-SGC / IG-EPN

Location of hot springs and landslides post earthquake of October 20 and measured parameters / Ubicación y algunos de fuentes termales slidings producidos después del 20 de octubre del earthquake. / Doc.OVSP-SGC / IG-EPN

A helicopter flight shows no surface changes or new fumaroles, cracks. (See photo above)


The IGEPN concluded that the process of magma intrusion continues, without surface manifestations. The alert level remains at orange.

 

Observatoire Volcanologique de Pasto / IGEPN - link

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

Scientists at the Hawaii Volcano Observatory conducted on Nov. 1 an inspection in the field of the "27 june's lava flow".

The flow front remains stable, while breakouts, escapes of lava, are present elsewhere on the distal part of the flow.

 

Hawaii / Pahoa - lava entered  two properties 10/27/2014 - photo USGS-HVO

Hawaii / Pahoa - lava entered two properties 10/27/2014 - photo USGS-HVO

The lobe, coming down the forest slope near the cemetery of Pāhoa, entering Friday afternoon in a private property. The lava came in contact with a dam, made ​​of earth and blocks of earlier lava flows, before inflating to the point of overcoming. You can view the deviation of the lava flow by his path at right angles near a large building on an aerial photo of the HVO. Its end is just 200 meters from the front stabilized of the flow, at 17:15.

Hawaii /Pāhoa - bottom right of the photo, we can see the flow front and the right angle deflection near a large building, and the road to Pāhoa - photo USGS-HVO

Hawaii /Pāhoa - bottom right of the photo, we can see the flow front and the right angle deflection near a large building, and the road to Pāhoa - photo USGS-HVO

 Hawaii / Pāhoa - the cast has swollen to the point of overcoming the edge of the artificial dam made to protect a property - photo USGS-HVO 10/30/2014

Hawaii / Pāhoa - the cast has swollen to the point of overcoming the edge of the artificial dam made to protect a property - photo USGS-HVO 10/30/2014

Maps of the flow on 29.10, 31.10 and 11.01.2014 (latest developments in bright red) - a click to enlarge - doc-USGS HVO / Digital Globe
Maps of the flow on 29.10, 31.10 and 11.01.2014 (latest developments in bright red) - a click to enlarge - doc-USGS HVO / Digital Globe
Maps of the flow on 29.10, 31.10 and 11.01.2014 (latest developments in bright red) - a click to enlarge - doc-USGS HVO / Digital Globe

Maps of the flow on 29.10, 31.10 and 11.01.2014 (latest developments in bright red) - a click to enlarge - doc-USGS HVO / Digital Globe

A new inflationary episode was set up Saturday at the summit, which can lead to a small increase in the Pu'u O'o eruption ratio, without prejudice to its action on an impact on the distal portion of the "June 27's lava flow".

The volcanic alert level remains at "Warning ".

 

Hawaii / Pahoa - Sluggish pahoehoe lava lobe on the southern edge of the " June 27's lava flow" - photo-USGS HVO on 11/01/2014

Hawaii / Pahoa - Sluggish pahoehoe lava lobe on the southern edge of the " June 27's lava flow" - photo-USGS HVO on 11/01/2014

Hawaii / Pahoa - a finger of lava oozing from the north edge of the " 27 June's laca flow" in a forest zone - photo-USGS HVO on 11/01/2014

Hawaii / Pahoa - a finger of lava oozing from the north edge of the " 27 June's laca flow" in a forest zone - photo-USGS HVO on 11/01/2014

Source : HVO  2 novembre / 3h48 UTC report.

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

At Kilauea volcano, the eruption continues both at the top and within the East rift zone, with high rates of gas emitted.

On October 19, a portion of the inner wall of the Overlook crater, consisting of juvenile  lava solidified on its periphery, has suddenly collapsed into the lava lake at 6:30. For a few minutes, the spattering marked the edge of the lava lake, whose level fluctuated between 55 and 60 meters below the floor of the Halama'uma'u.

These small collapses are current, and gradually result in an enlargement of the crater; They also justify the closure of the overlook on the Halema'uma'u crater because of the risks of spattering
.

. Collapse of the Crater Overlook - October 19, 2014 - photo HVO

. Collapse of the Crater Overlook - October 19, 2014 - photo HVO

In the east rift zone, the eruption of Pu'u O'o, ongoing for over thirty-one years, fed since June 2014  a lava flow in ENE direction, from new open vents on the side northeast of the cone. "The 27 June's lava flow" was inspected by scientists of HVO on 22 October. It measures to date 20.8 km, measured along the axis of the flow and descends towards  Pāhoa at a speed of 40 meters per day.

A finger of lava, fifty meters wide, exceeded the flow front in the last two days, and walked on 370 meters since Monday. She now advance into a ravine, which increased its displacement from a ratio of 80 meters per day to 300 m / day over the past two days. The tip of lava is now at 1,000 meters Apa'a street.

Civil Defense reported some fires, winds carrying smoke and VOG to Puna and Hilo.

 

East Rift Zone - " June 27's lava flow" by day and a thermal imaging camera - one click to enlarge - doc. HVO

East Rift Zone - " June 27's lava flow" by day and a thermal imaging camera - one click to enlarge - doc. HVO

East Rift Zone - The front of " the June 27's lava flow" and fires caused in the surface vegetation; ignition of plants generate methane explosions - photo HVO

East Rift Zone - The front of " the June 27's lava flow" and fires caused in the surface vegetation; ignition of plants generate methane explosions - photo HVO

East Rift Zone - "The 27 June's lava flow" and red areas of high temperature, seen by the satellite of the Nasa EO-1 / ALI (Advanced Land Imager) on 21/10/2014

East Rift Zone - "The 27 June's lava flow" and red areas of high temperature, seen by the satellite of the Nasa EO-1 / ALI (Advanced Land Imager) on 21/10/2014

 East Rift Zone - View of the site of the 27 June's lava flow, from its origin on the slopes of Pu'u O'o to the lava front, near Apa'a st. The residential area of Pahoa is partially visible in the left corner. - Photo HVO

East Rift Zone - View of the site of the 27 June's lava flow, from its origin on the slopes of Pu'u O'o to the lava front, near Apa'a st. The residential area of Pahoa is partially visible in the left corner. - Photo HVO

Sources :

HawaIian Volcano Observatory - link

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
 Chiles volcano - photo Ingeominas

Chiles volcano - photo Ingeominas

The monitoring network of Cerro Negro de Mayasquer and Chiles, the "Siamese" volcanoes on the border between Ecuador and Colombia, reported increased seismic activity in the area, with earthquakes associated with the fracturing of rocks.

The total earthquakes until 13 October of around 25,000 events, characterized by epicenters located between 1,000 and 4,000 meters south-west of Chiles volcano, with a magnitude between 0.7 and 3.5 and a depth of between 300 and 7,000 meters (summit is located at 4700 meters). These earthquakes were not felt Ecuadorian side, but perceived by the inhabitants of Cumbal in the Chiles reserve. Slight inflation of the volcano is recorded.

Analysis of this activity was done in collaboration between IGEPN and Ingeominas.


 

The volcano Cerro Negro de Mayasquer - photo Ingeominas

The volcano Cerro Negro de Mayasquer - photo Ingeominas

Cerro Negro, to the left & Chiles, snowy, to the right - photo Minard Hall, 1985 (Escuela Politécnica Nacional, Quito) / in GVP

Cerro Negro, to the left & Chiles, snowy, to the right - photo Minard Hall, 1985 (Escuela Politécnica Nacional, Quito) / in GVP

On October 20, at 2:33 p.m. local, an earthquake of magnitude 5.9 / 5.8 centered on the southwest flank of the volcano Chiles, 6 km depth was recorded, along to Tufiño of falling objects, damage of glass and other minor damage, and felt at Cumbal, Colombian side.

At that time, it's over 39,000 volcano-tectonic earthquakes were counted in 22 days, associated with the fracturing of rocks, accompanied by a lower proportion of earthquakes  LP and VLP type, in connection with fluid movements. GPS stations on the southeast flank of the volcano indicate an increase of the inflation in the last days.

The alert level has risen to orange, Colombian side, following recent events. The IGEPN indicates that we are dealing with an initial phase of magmatic intrusion and is considering the possibility of a phreatic eruption at Chiles with production of ballistic missiles, ash fall or mud flows.

The last eruption of Chiles date, after the GVP, of 160,000 years ago, which points out hot springs and an active hydrothermal system on its eastern flank.

20/10/2014 Earthquake - M 5.8 - doc Geoscope / IPGP

20/10/2014 Earthquake - M 5.8 - doc Geoscope / IPGP

Maps of areas at risk for Chiles (left) and Cerro Negro (right) - Doc. Ingeominas / one click to enlarge - In red : zone of high risk of pyroclastic flows, lava flows, ash falls or lateral collapse - In orange: Zone to moderate pyroclastic flows and lahars risk - In Chamois: Danger Zone important ash falls, and low for other volcanic hazards.Maps of areas at risk for Chiles (left) and Cerro Negro (right) - Doc. Ingeominas / one click to enlarge - In red : zone of high risk of pyroclastic flows, lava flows, ash falls or lateral collapse - In orange: Zone to moderate pyroclastic flows and lahars risk - In Chamois: Danger Zone important ash falls, and low for other volcanic hazards.

Maps of areas at risk for Chiles (left) and Cerro Negro (right) - Doc. Ingeominas / one click to enlarge - In red : zone of high risk of pyroclastic flows, lava flows, ash falls or lateral collapse - In orange: Zone to moderate pyroclastic flows and lahars risk - In Chamois: Danger Zone important ash falls, and low for other volcanic hazards.

Sources :

- IGEPN rapports 20-23 - link

- Ingeominas / Pasto - link

- Global Volcanism Program - Cerro Negro de Mayasquer - link

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

An article in the journal Remote Sensing of environment highlights innovative work on monitoring rates of magma emitted by underwater eruptions in shallow areas.

 

El Hierro - 03.11.2011 - image of the sea surface of the submarine eruption at the peak - doc.InVolcan / Guardia Civil

El Hierro - 03.11.2011 - image of the sea surface of the submarine eruption at the peak - doc.InVolcan / Guardia Civil

A collaboration between INVOLCAN, the University of Las Palmas, the INGV, the University of Ohio and Bionerics Research Company, with the help of the helicopter unit of the Guardia Civil in the Canaries, during the eruption in El Hierro / off La Restingua in 2011-2012, allowed an assessment of the volume of magma emitted during a submarine eruption by the thermal imaging departing an helicopter, method easier to use and cheaper than the bathymetric surveys, and the development of a physical model of heat transfer between the eruptive underwater mouth and the surface of the sea.

From the heat transfer, it was estimated the total volume of magma emitted, 300 million cubic meters. This value is in the range of 10% compared to those obtained by bathymetric surveys carried out by the Instituto spanish Oceanographic (329 million m³).

 El Hierro / La Restingua - 06.11.2011 - Thermal image - doc. InVolcan doc / Guardia Civil

El Hierro / La Restingua - 06.11.2011 - Thermal image - doc. InVolcan doc / Guardia Civil

El Hierro / La Restingua - 06.11.2011 - photo of the area covered by the thermal image above - InVolcan doc / Guardia Civil

El Hierro / La Restingua - 06.11.2011 - photo of the area covered by the thermal image above - InVolcan doc / Guardia Civil

This innovative methodology could be used by other researchers in future underwater eruptions, and help to optimize the management of underwater volcanic crises to come.

 

Sources :

- Diario de Avisos - Involcan valida una nueva técnica para medir magma de un volcán submarino – link

- Remote Sensing of Environment - Magma emission rates from shallow submarine eruptions using airborne thermal imaging. – by Pedro A. Hernández, Sonia Calvari, Antonio Ramos, Nemesio M. Pérez, Antonio Márquez, Roberto Quevedo, José Barrancos, Eleazar Padrón, Germán D. Padilla, Dina López, Ángel Rodríguez Santana, Gladys V. Melián, Samara Dionis, Fátima Rodríguez, David Calvo, Letizia Spampinato.

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The eruption of the volcano Nishinoshima is being actively pursued nearly a year after he started.

In November 2013, an eruption produced a new island off Nishinoshima. Since it grows constantly, and joined the mother-island in late December 2013, according to the Japan Coast Guards.

She is about to completely encompass the former island ... the balance between the constructive eruption and the destructive erosion is clearly in favor of maintaining the island for several years at least.

Some aerial photos dated allow to see the evolution in recent months, with the evolution of the flows northward .

 

On 24.12.2013, the junction is nearly completed between the two islands - photo Japan Coast Guards

On 24.12.2013, the junction is nearly completed between the two islands - photo Japan Coast Guards

The difference is obvious in this photo from June 3, 2014 - Doc. Geological Survey Japan / AIST

The difference is obvious in this photo from June 3, 2014 - Doc. Geological Survey Japan / AIST

On 26 August 2014, the snacking continues - photo Japan Coast Guards

On 26 August 2014, the snacking continues - photo Japan Coast Guards

Last photo, October 16, 2014 - photo Japan Coast Guards

Last photo, October 16, 2014 - photo Japan Coast Guards

On the left, Nishinoshima map on 23/07/2014 - on the right, on 16.10.2014 - one click to enlarge the maps - Doc. Japan Coast Guards / JCGOn the left, Nishinoshima map on 23/07/2014 - on the right, on 16.10.2014 - one click to enlarge the maps - Doc. Japan Coast Guards / JCG

On the left, Nishinoshima map on 23/07/2014 - on the right, on 16.10.2014 - one click to enlarge the maps - Doc. Japan Coast Guards / JCG

Sources : Documents and photos from

- Japan Coast Guards - link

- Japan Geological Survey / AIST





 

Lire la suite

<< < 10 11 12 13 14 15 16 17 18 19 20 > >>

Articles récents

Hébergé par Overblog