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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
Ruapehu's Crater Lake - photo J.Shook

Ruapehu's Crater Lake - photo J.Shook

The crater lake of Mt Ruapehu, located on North Island / New Zealand has passed since the beginning of December 2014 from 15 ° C to over 40 ° C, according to the report of the GNS of January 30, 2015.

Measurements carried out in mid-January show changes in lake chemistry, particularly increased volcanic gas discharge, convection currents and discoloration: it went from blue-green to pale gray. All these changes indicate a new warming of the hydrothermal system beneath the summit lake.

 

The massif of Ruapehu - photo J.Shook

The massif of Ruapehu - photo J.Shook

The volcanologist Brad Scott notes that "since 1950, the Crater lake's temperature ranges between 9 ° and 60 ° C. The lake is at a temperature higher than 37 ° C about 25% of the time, with an average of 30 ° C . The temperature cycles presented by the lake are not unusual ... since 2010, there are five heating cycles. {...} More rarely, the temperature rises above 40-42 ° C, which can give start to small steam eruptions. The current situation is very similar to the climax of heating episodes encountered between 1985 and 1996 ... if the temperature of the lake continues to increase, the largest eruptions could occur. "

Despite the risk of a phreatic eruption, the volcanic alert level remains at "1 / minor instability" and the aviation alert to "green".

Aerial view of the summit of Ruapehu September 26, 2007, days after a brief eruption. Crater Lake on the left, covered the top of ash and mud, and spawned a major lahar down the Whangaehu glacier (center) and another smaller one at the outlet of the lake in a gully (far left) - Photo courtesy of GeoNet 2007

Aerial view of the summit of Ruapehu September 26, 2007, days after a brief eruption. Crater Lake on the left, covered the top of ash and mud, and spawned a major lahar down the Whangaehu glacier (center) and another smaller one at the outlet of the lake in a gully (far left) - Photo courtesy of GeoNet 2007

Ruapehu is a complex stratovolcano, with an andesitic dominant, that have been built since 200,000 years in at least four episodes. This volcanic massif of 110km³ is elongated NNE-SSW and surrounded by a plain of volcaniclastic debris.

It was scored between 22,600 and 10,000 years ago by a series of sub-Plinian eruptions. Among summital vents and sides, only the Crater Lake is considered as active during historical time. It would be formed there are only 3,000 years, and has frequent explosive eruptions. The lahars produced by phreatic eruptions type of Crater lake are a danger to the ski area of the upper flanks and lower valleys.

Aerial view of Ruapehu - left in October 2002 - on the right, we see the trace of the lahar 25.03.2007 - Doc. NASA Terra ASTER. - Click for larger view.Aerial view of Ruapehu - left in October 2002 - on the right, we see the trace of the lahar 25.03.2007 - Doc. NASA Terra ASTER. - Click for larger view.

Aerial view of Ruapehu - left in October 2002 - on the right, we see the trace of the lahar 25.03.2007 - Doc. NASA Terra ASTER. - Click for larger view.

Sources :

- GNS - bulletin d'alerte volcanique du 30 janvier 2015 - link

- Global Volcanism Program - Ruapehu

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Fogo Crater / 26.01.2015 - photo Observatório Vulcanológico Cabo Verde (OVCV)

Fogo Crater / 26.01.2015 - photo Observatório Vulcanológico Cabo Verde (OVCV)

Fogo / Cape Verde:

The activity continues with a lava flow that rose 1.5 meters per hour towards Monte Beco and Monte Saia. Nadir Cardoso, from the University of Cape Verde, reports that the flow is located 1500 meters from the eruptive mouth, and should advance through a tube, since no lava emission is collected. Degassing continues accompanied by small explosions and ash plume reaching over 200 meters high. Teams from the Uni-CV continue the monitoring of gas after over two months of activity.

The International Agency of the United States for the development, USAID, has provided the United Nations Development Programme $ 50,000 to respond to emergencies. These funds are for the needs of about 1,000 displaced persons, both in terms of reconstruction materials, water tanks and other household utensils, and from that of the purchase of school supplies.

Source: Fogo News.

 

Fogo - inside the active crater / 26.01.2015 - photo Observatório Vulcanológico Cabo Verde (OVCV)

Fogo - inside the active crater / 26.01.2015 - photo Observatório Vulcanológico Cabo Verde (OVCV)

At Nevado del Ruiz, Colombia, the seismicity remains a concern according the Volcanological Observatory of Manizales, with the continuation of seismic activity type VT associated with fracturing of rocks, in a northern, southeast area and around Arenas crater at a depth of between 1 and 9 km, and earthquakes associated with fluid dynamics inside the volcanic conduits. Gas and vapor emissions give an essentially white plume up to 1,500 meters above the crater. The alert level remains at Amarillo / III

(Report of the SGC Manizales 01/28/2015)

 

Nevado del Ruiz - 28.01.2015 / 8:40 - photo SGC Manizales

Nevado del Ruiz - 28.01.2015 / 8:40 - photo SGC Manizales

Sabancaya, Peru, shows signs of disturbance of the hydrothermal system related to a magmatic intrusion. Type VT earthquakes associated with fracturing rocks are continuing with an average of 122 events / day located at the NE crater. Over the past three days, the number of episodes of tremor and that of earthquakes associated with the presence of magmatic material has increased.

Source: IGP.
 

Sabancaya - photo INGEMMET 2013

Sabancaya - photo INGEMMET 2013

To Holuhraun lava field / Iceland, the situation has little changed, despite an eruptive intensity slightly down. Measurements taken on January 21 show that the lava field gained in thickness the last three weeks, with a feed ratio of about 100 / sec. Its volume reached almost 1.4 cubic kilometers.

Seismicity remains high in Bárðarbunga with 150 events since last Friday, and 50 earthquakes at the Dyke.

Sources:
- Scientific Advisory Board of the Icelandic Civil Protection 01.27.2015
- Iceland Review

Holuhraun - thickness of the flows of the lava field - Doc. IES

Holuhraun - thickness of the flows of the lava field - Doc. IES

Holuhraun activity - the thickness of the flow refers to the man to the left - photo 2015.01.27 Tomas Freyr Kristjansson / Caters news agency / Dailymail

Holuhraun activity - the thickness of the flow refers to the man to the left - photo 2015.01.27 Tomas Freyr Kristjansson / Caters news agency / Dailymail

Activity in Holuhraun - gas fumes are still important - photo 2015.01.27 Tomas Freyr Kristjansson / Caters news agency / Dailymail

Activity in Holuhraun - gas fumes are still important - photo 2015.01.27 Tomas Freyr Kristjansson / Caters news agency / Dailymail

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Chaparrastique / San Miguel - 25/01/2015 - photo Tomás Gutiérrez / El Savador.com

Chaparrastique / San Miguel - 25/01/2015 - photo Tomás Gutiérrez / El Savador.com

This Monday, January 26, 2015 at 6:43, the Chaparrastique was the seat of a small explosion, which generated an ash column quickly dispersed to the SW, where slight ash falls were reported on Piedra Azul. The explosion was accompanied by rumbling and vibration.

The air quality has changed somewhat, reaching an unhealthy level for the vulnerable: 0.2 <ppm <1.

MARN says that we should not approach the top of the volcano, because of the possibility of sudden explosions and gas emissions.

Chaparrastique - ash emission seen by the camera placed at Cerro El Pacayal / MARN

Chaparrastique - ash emission seen by the camera placed at Cerro El Pacayal / MARN

Chronology of explosions and vibrations between December 2013 and January 2015 - doc .MARN

Chronology of explosions and vibrations between December 2013 and January 2015 - doc .MARN

Chaparrastique - the eruption and the plume of 29 December 2013 - Doc. RSOE

Chaparrastique - the eruption and the plume of 29 December 2013 - Doc. RSOE

Sources :

MARN – Ministerio de Medio ambiente y Recursos Naturales El Salvador.- link

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The high-resolution satellite Pleiades, operated by Airbus Defence and Space offers us images of volcanic activity of Tonga volcano. After the inspection of New Zealand teams and images in the first half of January, here is a clear satellite image that reveals a new island almost circular, with a diameter of about 1,500 meters, connected to Hunga Ha'apai by a wide isthmus.

The crater is visible, and we can see that at the date of the satellite photo, Jan. 19, 2015, the eruption has subsided.

 

The new island formed by the surtseyan eruption is connected to Hunga Ha'apai - 01.19.2015 Pleiades satellite

The new island formed by the surtseyan eruption is connected to Hunga Ha'apai - 01.19.2015 Pleiades satellite

Hunga Ha'apai - 01/18/2015 - Broadcasting photonBroadcomfm

Hunga Ha'apai - 01/18/2015 - Broadcasting photonBroadcomfm

Compared with the photo of July 2014, we see that the vegetation of the nearby islands disappeared under the ashes of the eruption.
 

Hunga Ha 'apai, left - photo satellite Pleiades 2 July 2014.

Hunga Ha 'apai, left - photo satellite Pleiades 2 July 2014.

Source :

Airbus Defence and Space - Eruption d’un volcan dans l’archipel des Tonga, Pléiades assiste à la naissance d’une nouvelle île - link

via Shérine France que je remercie.

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The submarine eruption at El Hierro in the Canary Islands in 2011 produced floating rocks, the famous "restingolitas".

The lateral movement of magma for miles in contact with sediment interface at 4.5-5 km deep, corresponding to a sedimentary level of the pre-island, led to the discovery of sedimentary xenoliths in these rocks balloons issued during the first week of activity.

Nannofossils were found in 50% of samples of xeno-pumice examined microscopically by an international group of scientists ... among them, coccoliths which are bio-stratigraphic markers.

 

El Hierro - restingolitas issued on 04.11.2011 - photo IGN / CSIC

El Hierro - restingolitas issued on 04.11.2011 - photo IGN / CSIC

Fossils clarify a theory about the origin of the Canaries.
 Migration model of the mantle plume feeding the underwater eruption of El Hierro - a click to enlarge - left, Doc. The Provincia.es - right, model Carracedo / GVP 2012. Migration model of the mantle plume feeding the underwater eruption of El Hierro - a click to enlarge - left, Doc. The Provincia.es - right, model Carracedo / GVP 2012.

Migration model of the mantle plume feeding the underwater eruption of El Hierro - a click to enlarge - left, Doc. The Provincia.es - right, model Carracedo / GVP 2012.

The debated origin of volcanic islands of the Canary archipelago:

Two models are competing.
The first is based on the monitoring of the position of the volcanic activity by fractures marking the ocean floor, the second on the intervention of a mantle plume of molten rock feeding from below the growth of the islands.

A fixed mantle plume under the African plate moving eastward imply a more recent dating of islands and pre-volcanic sediments to the west ... the model based on fracture being more consistent in contrast with ages of island located randomly.

 

(a) Examples of sedimentary relicts in El Hierro xeno-pumice. (b) Temporal record of Calcareous nannofossils in xeno-pumice. Four samples contain Jurassic to Cretaceous species that define a common Albian/Cenomanian age (~100 Ma). Two samples contain two Pliocene to recent species that co-occur with one Paleogene species that was extinct at the Neogene-Quaternary boundary, dating the youngest sedimentary relicts to ~2.5 Ma (Piacenzian). One sample shows a mixed age assemblage (see text for details). (c–g) Representative smear slides of identified taxa. (c): Reticulofenestra spp., (d): Watznaueria ovata, (e): Retecapsa crenulata, (f): Watznaueria manivitiae, (g): Watznaueria fassacincta. - in "Nannofossils in 2011 El Hierro eruptive products reinstate plume model for Canary Islands"

(a) Examples of sedimentary relicts in El Hierro xeno-pumice. (b) Temporal record of Calcareous nannofossils in xeno-pumice. Four samples contain Jurassic to Cretaceous species that define a common Albian/Cenomanian age (~100 Ma). Two samples contain two Pliocene to recent species that co-occur with one Paleogene species that was extinct at the Neogene-Quaternary boundary, dating the youngest sedimentary relicts to ~2.5 Ma (Piacenzian). One sample shows a mixed age assemblage (see text for details). (c–g) Representative smear slides of identified taxa. (c): Reticulofenestra spp., (d): Watznaueria ovata, (e): Retecapsa crenulata, (f): Watznaueria manivitiae, (g): Watznaueria fassacincta. - in "Nannofossils in 2011 El Hierro eruptive products reinstate plume model for Canary Islands"

The age of the youngest fossil found, about 2.5 Ma, is consistent with the dating of the beginning of the construction of the shield volcano of El Hierro, between the Pliocene and Quaternary. He represents the age of the youngest pre-island sediment of the archipelago of the Canary .

Ocean sediments become younger from east to west of the archipelago, the model of the origin of it related to a mantle plume is enhanced.

A): Map of Canary (blue) and Madeira (red) archipelagos, associated seamounts, and magnetic ocean floor anomalies (yellow)28. New and reported ages imply an east to west age progression for the Canary and Madeira archipelagos, whereas the Cretaceous seamounts to the south of the Canaries appear randomly age distributed. The new fossil ages imply a time window between Cretaceous and present-day Canary volcanism of ~130 Ma in the vicinity of El Hierro. (B): Schematic SW-NE cross section through the Canary archipelago (vertically exaggerated). The El Hierro nannofossils now identify the youngest sub-volcanic sedimentary strata (~2.5 Ma) in the west of the archipelago. - in "Nannofossils in 2011 El Hierro eruptive products reinstate plume model for Canary Islands"

A): Map of Canary (blue) and Madeira (red) archipelagos, associated seamounts, and magnetic ocean floor anomalies (yellow)28. New and reported ages imply an east to west age progression for the Canary and Madeira archipelagos, whereas the Cretaceous seamounts to the south of the Canaries appear randomly age distributed. The new fossil ages imply a time window between Cretaceous and present-day Canary volcanism of ~130 Ma in the vicinity of El Hierro. (B): Schematic SW-NE cross section through the Canary archipelago (vertically exaggerated). The El Hierro nannofossils now identify the youngest sub-volcanic sedimentary strata (~2.5 Ma) in the west of the archipelago. - in "Nannofossils in 2011 El Hierro eruptive products reinstate plume model for Canary Islands"

Sources :

- Nature / Scientific reports  : Nannofossils in 2011 El Hierro eruptive products reinstate plume model for Canary Islands - by Kirsten Zaczek & al. - link

- Uppsala Universitet  - Fossils survive volcanic eruption to tell us about the origin of the Canary Islands - link

- archives sur l'éruption sous-marine d'El Hierro 2011-2012

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
The crack and the lava lake of Holuhraun / Nornahraun - 01.21.2015 - photo Coast Guards / Dr. Anja Schmidt on Twitter

The crack and the lava lake of Holuhraun / Nornahraun - 01.21.2015 - photo Coast Guards / Dr. Anja Schmidt on Twitter

Scientists from the Institute of Earth Sciences and the Met Office had to leave the eruption site of Holuhraun on January 21 because of the extremely high levels of sulfur dioxide.

Elín Björk Jónasdóttir, from IMO, reports that the level of SO2 was measured at 84,000 μgr / m³.

At that rate, the masks which are equipped scientists are not enough, and it remains only a solution : to evacuate the area as quickly as possible. This extreme level is due to the very calm wind conditions. Sulfur dioxide, heavier than the air, is concentrated to the eruption site instead of being dispersed over a larger area. The very changeable wind conditions also forced the teams to carry a dosimeter.

Levels above 2,000 μgr / m³ of SO2 were measured at the village of Reykjahlíð  north of the eruptive site, as well more moderate rates in Lake Myvatn.

 

 Ordinary Equipment of scientists working in the Holuhraun field - photo Institute of Earth Sciences / Iceland Magazine.

Ordinary Equipment of scientists working in the Holuhraun field - photo Institute of Earth Sciences / Iceland Magazine.

The levels of SO2 pollution over 2600 μgr / m³ are considered hazardous to health (already considered as critical over 600 μgr / m³ for sensitive groups).

The daily volume of SO2 emitted was estimated at 35,000 tons / day on January 21 and 30,000 tons on 23.01.




 

Location and magnitude of earthquakes in Bárðarbunga and Holuhraun the 23/01/2015 at 15:25 - Doc. IMO
Location and magnitude of earthquakes in Bárðarbunga and Holuhraun the 23/01/2015 at 15:25 - Doc. IMO

Location and magnitude of earthquakes in Bárðarbunga and Holuhraun the 23/01/2015 at 15:25 - Doc. IMO

The lava field has not greatly enlarged, but has thickened.

Seismic activity remains little different from previous days both at Bárðarbunga that at the level of the intrusive dyke. In the last 24 hours, one earthquake
above 4-magnitude was recorded north of the caldera ( M4,7 on 23.01 / 3:07).
 

 The Holuhraun lava field - 21/01/2015 - photo NASA EO-1

The Holuhraun lava field - 21/01/2015 - photo NASA EO-1

The Holuhraun dark lava field slice of on a completely white snowy and icy Iceland - Doc. Nasa

The Holuhraun dark lava field slice of on a completely white snowy and icy Iceland - Doc. Nasa

Sources :

- Iceland Magazine

- Icelandic Met Office - rapports journaliers - link

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Dukono - plume of May 2012 - photo Benisius Anu / Halmaherautara.com

Dukono - plume of May 2012 - photo Benisius Anu / Halmaherautara.com

The turbulent Dukono volcano, located north of Halmahera island in the Moluccas, let again talking about him since mid-January.

Darwin VAAC alerts have succeeded on January 14, 2015, with a plume rising to 2,100 m., and on January 19, with a plume to 2,700 m. The alert of 21 January / orange aviation code indicates abundant ash emissions identified by MTSAT-2 and the extension of the plume to the southwest to 50 km.

Dukono -  Prediction map of dispersio of the eruptive plume for 21-22.01.2015 - Doc. Darwin VAAC

Dukono - Prediction map of dispersio of the eruptive plume for 21-22.01.2015 - Doc. Darwin VAAC

To the left, location of Dukono in the Moluccas archipelago - right, geological map of the island of Halmahera and his active volcanoes - a click to enlarge - Doc. GVPTo the left, location of Dukono in the Moluccas archipelago - right, geological map of the island of Halmahera and his active volcanoes - a click to enlarge - Doc. GVP

To the left, location of Dukono in the Moluccas archipelago - right, geological map of the island of Halmahera and his active volcanoes - a click to enlarge - Doc. GVP

The Dukono shows an eruptive activity more or less continuously since 1933. This volcano complex present a low profile, with multiple peaks and overlapping craters; active areas are Malupang Magiwe and Malupang Warirang, the latter characterized by a crater 700 meters by 570. (GVP)

This volcano has some peculiarities as to its geology and local tectonics.

It is located on the island of Halmahera, geologically divided into two provinces, the western and the eastern.

The western province is part of a young volcanic field that extends from Morotai through the northern part of Halmahera, Ternate and Tidore, Bacan up.
All volcanoes considered as active and other older, are located in this western province. The area is largely covered by volcanic or sedimentary rocks, recent of from Neogene. The rocks of the basement, exposed south of the island of Bacan, are basic to ultrabasic with crystal inlays. The basement of the SW arm of Halmahera is composed of volcanic and volcaniclastic rocks in association with intrusive igneous rocks; they are exposed on the west side.

Tectonics of the Sulawesi-Maluku region:  Sangihe and Halmahera volcanic arc characterize a double subduction of oceanic microplate of the Mollucas. A: current situation - B: Situation there are 5 Ma - Doc Hall / 2000 / geology.um.maine.edu

Tectonics of the Sulawesi-Maluku region: Sangihe and Halmahera volcanic arc characterize a double subduction of oceanic microplate of the Mollucas. A: current situation - B: Situation there are 5 Ma - Doc Hall / 2000 / geology.um.maine.edu

Tectonics of the area is complex and involves several microplates including that of Halmahera, of Sangihe, Bird's Head and the Moluccas.

The Molucca Sea is the only current example of closure of an oceanic basin by a subduction of oceanic lithospheres in opposite directions, resulting in the creation of the Sangihe arc to the west and the Halmahera arc to the east.

The oceanic plate Maluku was originally part of the Philippine plate, there are 13 Ma, at a time when the Australian plate was further south. The Sangihe trench was active at that time, with a subduction dating from the Oligocene and older than that of Halmahera. The depth of the descending slab of the subduction zone Sangihe is greater than that which characterizes the subduction zone of Halmahera. The two plates, Sangihe and Halmahera, overlapping the plate from the Molucca Sea ... that will disappear eventually.

In the Molucca Sea, the Sangihe subduction absorbs a significant part of 10 cm / year of convergence Philippines / Sunda. GPS displacement speed of 80 mm / year north of the equator.

In the South Moluccas region south of the equator, this speed is rapidly depreciates at a rate of about 2 mm / year.

New activity at Dukono volcano in the archipelago of the Moluccas

Below are two videos showing the activity of Dukono in 2014 by the site Photovolcanica.
 

Sources :

- Global Volcanism Program - Dukono

- Photovolcanica - Dukono - link

- Maine.edu - The Molucca sea - link

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
 Vapor emissions above the eruptive site of Hunga Ha'apai - 17.01.2015 - photo Matangi Tonga on line

Vapor emissions above the eruptive site of Hunga Ha'apai - 17.01.2015 - photo Matangi Tonga on line

A visit at the eruptive Hunga Ha'apai site was made this weekend by the GNS volcanologists, accompanied by journalists of Matangi Tonga on line.


They report the same style of eruption than the 2009, but with a higher volume of erupted materials.High emissions of vapor, forming a high plume high of 7-10 km, is often issued with ejection periods of high humidity and dense ash, and small blocks at 200-300 meters. Ash emissions decrease from last week, with a rate of 2-3 per hour. Dangerous side surges still occasionally extend over one kilometer from the vent. We do not notice traces of pumice rafts or other floating debris.

Frigates advantage of thermals and animate this beautiful picture.

Tonga Met Service recommends a prohibited area security of 10 km around the site, due to the sulfur content of the gas cloud emitted by the eruption. Sulfur gases are observed in 15-25 nautical miles, while they are not in the immediate vicinity.
 

Hunga Ha'apai - Frigates birds advantage of thermal generated by the eruption - photo Matangi Tonga on line

Hunga Ha'apai - Frigates birds advantage of thermal generated by the eruption - photo Matangi Tonga on line

After an increase of seismicity, the Soputan / North Sulawesi erupted on 18/01/2015 at 11:30, emitting a plume of ash and gas estimated at 5,500 meters, together with a block avalanche.

Nocturnal incandescent plume an estimated 700 m. and falls sur1.500 m west side blocks are identified in the late evening.

 

Soputan: the eruptive plume 18.01.2015 / 11:38 - photo PVMBG

Soputan: the eruptive plume 18.01.2015 / 11:38 - photo PVMBG

 Soputan: activity on 18.01.2015 / 11:10 p.m. loc. - Photo Chematierra / Volcanoalert / Twitter

Soputan: activity on 18.01.2015 / 11:10 p.m. loc. - Photo Chematierra / Volcanoalert / Twitter

Some pictures of the lava spine that has formed at the top of Sinabung, before it collapses ... these courses are unstable by nature.

The lava spine of Sinabung - a click to enlarge - 01/18/2015 Photo via Twitter / Adam LeopoldThe lava spine of Sinabung - a click to enlarge - 01/18/2015 Photo via Twitter / Adam Leopold

The lava spine of Sinabung - a click to enlarge - 01/18/2015 Photo via Twitter / Adam Leopold

The Icelandic lava field Holuhraun / Nornahraun reached nearly 85 km² today. Seismic activity remains constant Bárðarbunga, w ith 60 shakes the 18.01, and 15 for the dyke.

Note : the name of the lava field could still change ... according to Icelandic law, it is the local authority of the place of eruption that ala load, in this case it is the authority Myvatn: the volcanologist Þorvaldur Þórðarson suggested Nornahraun, because there was spotted Pelé's hair (nornahár in Icelandic), name adopted by the Met Office on the maps ... Ármann Höskuldsson, another volcanologist, described the eruption as the fire breathing of a dragon (dreki in Icelandic), due to the proximity of Drekagil, the canyon of the dragon, and proposed Drekahraun or Drekaborgir. (Iceland Review)

 

  Holuhraun - lava field - photo Páll Stefánsson / Iceland Review.

Holuhraun - lava field - photo Páll Stefánsson / Iceland Review.

Holuhraun lava field - the active areas are made more visible by image adjustments - doc IES / NASA EO-1

Holuhraun lava field - the active areas are made more visible by image adjustments - doc IES / NASA EO-1

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Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Facebook announces the anniversary of Retuit and the webcam of Colima.

Facebook announces the anniversary of Retuit and the webcam of Colima.

The World of volcanophily has a new webcam from January 16, with the installation of a public webcam at Volcán de Colima.

Installation results from sponsorship
Retuit / Sky Alert / Sergio Tapiro foto ; she was installed at 12.5 km from Colima Volcano, in the Laguna de Carrizalillos in Comala, which enjoys spectacular views of this beautiful stratovolcano.

It is available via this link: http://www.webcamsdemexico.com/webcam-volcan-de-colima.html

 

Volcán de Colima - 16.01.2015 / 18h00 - Doc. webcamdemexico

Volcán de Colima - 16.01.2015 / 18h00 - Doc. webcamdemexico

This webcam was expected ... as reported by our friend Robin Campion, a volcanologist at UNAM and one of the leaders of the L.A.V.E. Belgium section to its business in Mexico, Colima seems to evolve since the end of last year to a more explosive mode.

After a first major explosion on November 21, the activity was followed by a sequence of successive explosions on December 24, accompanied by a plume of 2km.

On 3 January, the Global Volcanism Program reports an explosion in Colima, which generated a plume of 3km. and ash falls on an area up to 150 km NE of the volcano. More explosions are reported on 8 and 11 January, and a plume 12.

it's to the webcam to resume live observations ... with images of 16 and 17 January 2015.

 

Volcán de Colima - 17.01.2015 / 7:00 - Doc. webcamdemexico

Volcán de Colima - 17.01.2015 / 7:00 - Doc. webcamdemexico

Colima on 08/01/2015 - photo Ángel Guardián via Tapiro foto / Facebook

Colima on 08/01/2015 - photo Ángel Guardián via Tapiro foto / Facebook

Sources:

- Tapiro foto / Facebook

- Robin des Volcans / Overblog - link

- Global Volcanism Program - Colima

 

 

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Hunga Ha'apai - The eruption and the new island - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Hunga Ha'apai - The eruption and the new island - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Following a request from the Government of Tonga, New Zealand has provided support for an inspection of the new eruption. A representative of the High Commission provides us new photos, posted online this January 15, 2015 at 2:55 local.

They do not have the merit to confirm the report of volcanic activity 3 / 13.01.2015 of the Ministry of Information and Communications, at least for the location of the eruptive vent.

Hunga Ha'apai - cypressoïde plume and emission of gas/vapor - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Hunga Ha'apai - cypressoïde plume and emission of gas/vapor - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Hunga Ha'apai - cypressoïde plume and emission of gas/vapor - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Hunga Ha'apai - cypressoïde plume and emission of gas/vapor - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Hunga Ha'apai - in this picture, it seems that the new cone is "isolated" - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Hunga Ha'apai - in this picture, it seems that the new cone is "isolated" - January 13, 2015 - photo New Zealand High Commission, Nuku'alofa, Tonga

Following Matangitonga on line,

“A new island has been built by the eruption between the existing islands of Hunga Tonga and Hunga Ha’apai, and is now joined to Hunga Ha‘apai,” he stated.

The new island is more than 1 km wide, ~2km long and about 100 m high.

“During our observations the volcano was erupting about every five minutes. Dense ash was being erupted to a height of about 400 m, accompanied by some large rocks.

“Above about 1000 m, the eruption plume was almost exclusively steam. As the ash is very wet, most is being deposited close to the vent, building up the new island,” he stated.

Hazardous surges of ash and steam were seen to spread out horizontally during eruptions, and these extended more than 1 km from the erupting vent.

Ash fall and acidic rain was observed within 10 km of the eruption."

More news from their reception.

Sources :

- NewZealand foreign affairs - New Zealand High Commission Nuku'alofa, Tonga - link

- Ministry of Information & Communications Tonga  - link

- Matangitonga on line  - link

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