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

Articles avec #volcanic news catégorie

Publié le par Bernard Duyck
Publié dans : #Volcanic news, #Excursions and trips

In Yellowstone National Park, the "Old Faithful" geyser in the Upper Geyser Basin received its unique name in the 19th century due to the regularity and predictability of its eruptions.

 "Old Faithful" to the max. of its activity - photo archives © Bernard Duyck 2009

"Old Faithful" to the max. of its activity - photo archives © Bernard Duyck 2009

A sample of mineralized (silicified) wood was discovered in his mouth, as evidenced by a Journal published over 60 years ago. Its radiocarbon dating has just been confirmed in a study that was just published in October 2020, on 41 dates: 1233-1362 CE.

This date corresponds to a series of severe regional droughts, which lasted for many decades, at the end of the Middle Ages climate anomaly, before the onset of the Little Ice Age.

Murray pines (Lodgepole pine) were able to thrive in the mouth of an active natural geyser only during a period of great drought that affected much of the United States, and affected the native cultures of Anasazi, Fremont and Lovelock . The remains of trees were then preserved by mineralization in an alkaline water rich in silica ... to reveal to us today the mysteries of the "Old Faithful".

"Old Faithful", the "Vieux fidèle" - beginning of eruption - photo archives © Bernard Duyck 2009

"Old Faithful", the "Vieux fidèle" - beginning of eruption - photo archives © Bernard Duyck 2009

"Old Faithful" - end of eruption - photo archives © Bernard Duyck 2009

"Old Faithful" - end of eruption - photo archives © Bernard Duyck 2009

Natural geysers are rare on the planet, because they require special conditions to form: heat input from active or recent magmatism, and adequate geometry of rock fractures underground to ensure episodic discharge. These parameters can change following earthquakes modifying the fractures, or by regional variations in precipitation, which feed underground reservoirs.

 

Climate change forecasts, which include regional droughts for the middle of the 21st century, suggest less frequent eruptions of these geysers, and even the end of their activity.

Happy are those who were able to see them in great shape!

 

Sources:

- USGS - Caldera chronicles - A time when Old Faithful wasn’t so faithful

- Geophysical Research letters - Yellowstone's Old Faithful Geyser Shut Down by a Severe 13th Century Drought

"Old Faithful" featured on the National Park / Limited Centennial Edition poster.

"Old Faithful" featured on the National Park / Limited Centennial Edition poster.

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news

Dernière semaine de la série " Des volcans et des hommes ",  sur Arte tv.

Le rendez-vous est à 17h35, avec au programme :

 

- Lundi 8 avril : Guatemala, des volcans en terre Maya.

- Mardi 9 avril : Islande, les seigneurs du feu.

- Mercredi 10 avril : Mauna Loa, le géant d'Hawaii.

- Jeudi 11 avril : Nouvelle-Zélande, lacs volcaniques en terre maorie.

- Vendredi 12 avril : Equateur, les irréductibles du Tungurahua.

" Des volcans et des hommes " – cette semaine sur Arte Tv

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news
 Barren island - activity from 17.10.2018 - photo Sugender Pon via Facebook

 Barren island - activity from 17.10.2018 - photo Sugender Pon via Facebook

 Barren island - activity from 17.10.2018 - photo Aquaholics / Facebook

 Barren island - activity from 17.10.2018 - photo Aquaholics / Facebook

On Barren Island, in the Andaman Islands, the activity is characterized by lava fountains feeding a northward flow.

The thermal anomaly was reinforced on October 22, with 217 MW measured by Mirova.

Sources: Mirova and local observers

Barren island - lava flow to the north - image Sentinel 2 bands 12,11,4 from 18.10.2018 - one click to enlarge

Barren island - lava flow to the north - image Sentinel 2 bands 12,11,4 from 18.10.2018 - one click to enlarge

Barren island - high thermal anomaly - Doc. Mirova at 22.10.2018 / 4:25

Barren island - high thermal anomaly - Doc. Mirova at 22.10.2018 / 4:25

In Alaska, the instability that characterizes the Veniaminof continues.

The seismicity is above base levels, with a peak of the RSAM on October 21st, and there is a continuous low level tremor.

Veniaminof - RSAM from 15 to 22.10.2018 - Doc.AVO


On satellite images, the volcano has high surface temperatures, and nighttime glow is visible on the Perryville webcam; during the day, these persistent emissions of steam are observed.
 

Sources: AVO, Sentinel 2 and Mirova

Veniaminof - High thermal anomaly - Doc.Mirova at 21.10.2018 / 23:25

Veniaminof - High thermal anomaly - Doc.Mirova at 21.10.2018 / 23:25

The Arenal Volcano shows an increase in the degassing of crater C, which is where the last eruptions were given. This degassing sometimes reaches more than 300 meters above the level of the crater and is visible from several points of San Carlos.
This activity corresponds to reports from people who have been at the top, and who report that in recent days they have been dizzy, there is little air and the gas is suffocating, perhaps because of carbon dioxide ( CO2), which is liberated in depth by the magmatic systems. In addition, there have been small earthquakes that indicate internal activity.

Source: VSF / Volcanoes Sin Fronteras 21.10.2018

Arenal - archive photo 02.04.2015 - photo Federico Chavarría / OVSICORI.

Arenal - archive photo 02.04.2015 - photo Federico Chavarría / OVSICORI.

At Dukono, on the island of Halmahera, eruptive activity continues; despite the fact that volcano emissions are not identifiable in the Himawari satellite images, the Darwin VAC has issued an ash dispersion advisory for this October 22nd.

Copernicus reports the availability of the information provided by Sentinel 5Ps gas emissions on open access, which is reflected in a picture of Dukono's sulfur dioxide emissions.

Sources: VAAC Darwin and Sentinel 5P

 

 Dukono - Sentinel 5P (SO2) data is available Open Access Hub Copernicus

 Dukono - Volcanic Ash Advisory for 21-22.10.2018 - Doc. VAAC Darwin

Dukono - Volcanic Ash Advisory for 21-22.10.2018 - Doc. VAAC Darwin

 Dukono - Sentinel5P datasets (SO2, 03, HCHO) now available on our Open Access Hub Copernicus - one click to enlarge

Dukono - Sentinel5P datasets (SO2, 03, HCHO) now available on our Open Access Hub Copernicus - one click to enlarge

An interesting document on the explosions and sounds of gas output in "train machine" was posted by Martin Rietze, illustrating the activity of Sangeang Api.

Source: Video by drone Martin Rietze.

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news
Veniaminof - zoom on an image Sentinel 2 bands 12,11,4 from 18.10.2018

Veniaminof - zoom on an image Sentinel 2 bands 12,11,4 from 18.10.2018

At Veniaminof, a small activity continues this week at the intracaldeira cone. The western branch of the lava field on the southern flank remains active.

Constant steam emissions can be seen on the Perryville webcam.

On October 18, the emissions were particularly strong, with a plume dominated by steam, with the presence of sulfur dioxide and a small amount of ash, and extending for 30 km to the northeast.

The effusion of lava continues, as indicated by a relatively continuous tremor.

The Veniaminof remains in Volcanic Alert Watch and Orange Aviation Code

Source: AVO

 Veniaminof - This high resolution ESA Sentinel-2 image, dated Saturday, October 6, 2018, shows the continuous effusion of lava and a plume with a thin deposit of tephra towards the north. The flow front Is produced the strongest steam plume and the ice collapses around the edges of the flow front - AVO Dietterich, Hannah; ESA Sentinel-2

 Veniaminof - This high resolution ESA Sentinel-2 image, dated Saturday, October 6, 2018, shows the continuous effusion of lava and a plume with a thin deposit of tephra towards the north. The flow front Is produced the strongest steam plume and the ice collapses around the edges of the flow front - AVO Dietterich, Hannah; ESA Sentinel-2

The images provided by Tropomi show significant sulfur dioxide emissions at Ambrym volcanoes in Vanuatu, and the interaction of the plume on Malekula Island, further west with more than 20,000 inhabitants.
 

Activity of Veniaminof, Ambrym and Merapi.
Activity of Veniaminof, Ambrym and Merapi.
Activity of Veniaminof, Ambrym and Merapi.

An image of Caliop / Nasa determined the height of the July 30, 2018 sulfur-containing aerosol cloud in the stratosphere, impacting a large area.

Ambrym - the cloud of sulfur dioxide at a stratospheric height on 30.07.2018 - image Nasa Caliop / AIRES

Ambrym - the cloud of sulfur dioxide at a stratospheric height on 30.07.2018 - image Nasa Caliop / AIRES

Four lava lakes are currently active on the island.

Sources: AIRES, Tropomi, Nasa Caliop via Simon Carn.

Benbow - up, the main lava lake and down, the secondary lava lake - Haos Blong volkeno photos
Benbow - up, the main lava lake and down, the secondary lava lake - Haos Blong volkeno photos

Benbow - up, the main lava lake and down, the secondary lava lake - Haos Blong volkeno photos

Marum - photo above, the Mbwelesu lava lake and downstairs, the Niri Mbwelesu - photos Haos Blong Volkeno
Marum - photo above, the Mbwelesu lava lake and downstairs, the Niri Mbwelesu - photos Haos Blong Volkeno

Marum - photo above, the Mbwelesu lava lake and downstairs, the Niri Mbwelesu - photos Haos Blong Volkeno

At Merapi, the phase of effusive activity continues: the dome reaches 18 October a volume of 201,000 m³, with a daily rate of growth rising to 6,200m³. The small lobe of the dome on the north side seems to progress.

The dome is considered stable for the moment, and the level of activity remains at 2 / Waspada, with a forbidden zone of 3 km radius around the summit.

Source: PVMBG

Merapi - growth of the lava dome at 18.10.2018 - Doc.PVMBG

Merapi - growth of the lava dome at 18.10.2018 - Doc.PVMBG

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news
 Dukono - 09.10.2018 / 7:18 am WIT - webcam PVMBG

Dukono - 09.10.2018 / 7:18 am WIT - webcam PVMBG

The Gunung Dukono, on Halmahera, in activity level II / Waspada, with a 2 km forbidden zone, is in constant eruption.

From yesterday to this morning, the summit of the volcano was observed visually until it was covered with mist. The plume is white to gray, thick, reaching 500 m above the summit.

The seismographs recorded on October 18th: 5 earthquakes of eruption and the continuous tremor with an amplitude of 0,5-15 mm (dominant 2 mm)

The last VONA is of ORANGE color, issued on October 18, 2018 at 12:04 WIT, relating to the eruption with an ash plume of a height of about 1729 m above sea level or about 500 m above the sea level. Mountain peak. The ash column moves east.

Dukono - Volcanic Ash Advisory 19.10.2018 / 4:15 am - Doc.VAAC Darwin IDD65290

Dukono - Volcanic Ash Advisory 19.10.2018 / 4:15 am - Doc.VAAC Darwin IDD65290

Simplified geological map of Halmahara / Moluccas - Doc. Oregonstate Univ.

Simplified geological map of Halmahara / Moluccas - Doc. Oregonstate Univ.

Gunung Ibu - sismicité au 18.10.2018 - Doc.Magma Indonesia

Gunung Ibu - sismicité au 18.10.2018 - Doc.Magma Indonesia

The Gunung Ibu, on Halmahera also in activity level 2 / Waspada, with a "no go zone" of 2km stretched 3.5 km north side, has been erupting continuously since 2008.

From yesterday to today, a white to gray plume is observed at a height between 200 and 600 meters above the summit.

Seismicity remains important, with 17 episodes of harmonic tremor on 18.10.

The VONA has been orange since October 6th.

Sources: PVMBG & VAAC Darwin

Piton de La Fournaise - Shots of the eruptive site on October 18th at 11:00 am local time. (© OVPF / IPGP)
Piton de La Fournaise - Shots of the eruptive site on October 18th at 11:00 am local time. (© OVPF / IPGP)

Piton de La Fournaise - Shots of the eruptive site on October 18th at 11:00 am local time. (© OVPF / IPGP)

At the Piton de la Fournaise, the intensity of the volcanic tremor (indicator of the eruptive intensity at the surface) is still very slightly decreasing.

Inflation (swelling) of the building is always recorded. This inflation reflects the pressurization of a localized source beneath the summit craters (Bory-Dolomieu) at a depth of 1-1.5 km, related to the recharge of the superficial reservoir by deeper magma.

The surface flow rates could not be estimated today because of lava flows that are too weak at the surface.

Piton de La Fournaise - GPS measurements on 18.10.2018 - OVPF / IPGP photo

Piton de La Fournaise - GPS measurements on 18.10.2018 - OVPF / IPGP photo

A field reconnaissance has been completed today. The observations show a surface activity still very limited. Strong degassing is always observed at the eruptive vent. Some resurgences and a small channel of a few tens of meters were visible this morning around 11:30 at the foot of the eruptive cone (eastern sector).

Source: OVPF - Find all the information related to the activity of the Piton de la Fournaise on the different media of the OVPF-IPGP:

- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),

- the Twitter account (https://twitter.com/obsfournaise?lang=en),

- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

The information in this document may not be used without explicit reference.

Piton de La Fournaise  - 19.10.2018 / 6h39 UTC - Camera du Piton de Bert

Piton de La Fournaise  - 19.10.2018 / 6h39 UTC - Camera du Piton de Bert

Sernageomin has reduced the alert level of two volcanoes, Osorno and the Puyehue - Cordon Caulle complex, from Amarilla to Verde, following a decrease in their internal activity.

Volcanic alert level on 18.10.2018 / Sernageomin Twitter
Volcanic alert level on 18.10.2018 / Sernageomin Twitter

Volcanic alert level on 18.10.2018 / Sernageomin Twitter

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news

A bit of everything in the absence of news of eruptions ...

At Piton de La Fournaise, the eruption started on September 15th at 4:25 am local time continues. The intensity of the volcanic tremor (indicator of eruptive intensity at the surface) is still very slightly decreasing.
The pistons have disappeared gradually, and since this morning 03:45 local time, no more gas piston ("gas puff" or "puff of tremor") is recorded at the eruptive site.

Piton de La Fournaise - the eruptive site on 14.10.2018, before the period of poor visibility - photo OVPF

Piton de La Fournaise - the eruptive site on 14.10.2018, before the period of poor visibility - photo OVPF

The Reunion Island Air Quality Observatory (ATMO REUNION) recently recorded a concentration of sulfur dioxide (SO2) particles at Saint-Joseph and Buffon. These transient episodes took place between Tuesday 9 and Thursday, October 11, 2018 (observation stations "Grand Coude" and Bourg Murat). The probable origin of this episode is related to the eruption of the Piton de la Fournaise and to the current weather conditions. During these episodes, the threshold of 300 μg / m3 / h of SO2 was exceeded for a limited time (1 to 2 hours).

During episodes, it is recommended that vulnerable or sensitive people limit intense physical or sports activities, including competitions, both outdoors and indoors.

Sources: OVPF and Imazpress

Retrouvez l’ensemble des informations relatives à l’activité du Piton de la Fournaise sur les différents médias de l'OVPF-IPGP:

- le site internet (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),

- le compte Twitter (https://twitter.com/obsfournaise?lang=fr),

- et le compte facebook (https://www.facebook.com/ObsVolcanoPitonFournaise/)

Les informations de ce document ne peuvent être utilisées sans y faire explicitement référence.

South Kilauea - The rupture zone (white dotted line), attributed to the M6.9 earthquake of 4 May 2018 with these previous earthquakes and aftershocks over the next 10 days, covers an area of ​​800 km² - Doc. USGS

South Kilauea - The rupture zone (white dotted line), attributed to the M6.9 earthquake of 4 May 2018 with these previous earthquakes and aftershocks over the next 10 days, covers an area of ​​800 km² - Doc. USGS

At Kilauea, the eruption is not relevant ... the strain, seismicity and gas emission ratios have not changed substantially over the past week.

The HVO finds weak seismic measurements at the summit and on the southern flank of Kilauea; they are small replicas of the magnitude 6.9 earthquake of May 4, 2018. Seismicity remains low in the East rift zone.

The deformation signals show a recharge of the median East rift zone.

 From the lava fields of the East Rift Zone, the view is clear, in absence of VOg on the MaunaLoa (on the left) and the Mauna Kéa (on the right) - photo 15.10.2018 HVO

From the lava fields of the East Rift Zone, the view is clear, in absence of VOg on the MaunaLoa (on the left) and the Mauna Kéa (on the right) - photo 15.10.2018 HVO

The low levels of sulfur dioxide emitted result in a significant decrease in VOG (Volcanic Air Pollution) and clear the view of Mauna Loa and Mauna Kea from the lava fields of the rift zone.

For the beauty of the shooting: The first place in the National Geographic category competition was won by photographer Karim Ilya, with a photo of the lava flow from the penultimate eruption, arriving at sea.

 

Sources: HVO, USGS and National Geographic

Kilauea - 2017 lava entering the sea at Kamokuna  - photographer Karim Iliya - who won first place in the landscape last year's photo contest. National Geographic

Kilauea - 2017 lava entering the sea at Kamokuna - photographer Karim Iliya - who won first place in the landscape last year's photo contest. National Geographic

New excavations on the site of Pompei / Regio V allowed to accurately repeat the eruption of Vesuvius.

This dating was until now based on the writings of Pliny the Younger to his friend Tacitus, who set the disaster on August 24, 79.

The discovery of a charcoal graffiti, mentions: " XVI K NOV ", or the 16th day before the calends of November (the calends were the first day of each month in the Roman calendar), which corresponds to October 17 of the modern calendar.

It supports another discovery: calcified branches bearing berries, normally present in autumn.

This discovery was presented by the head of the Pompeii site, in the presence of the Minister of Culture.

 

Sources: Antigua Roma: El grafito cambió the fecha of the destruction of Pompeya

Pompei, inscription on a wall dating from the eruption of October Vesuvius 79 - Doc.EPA

Pompei, inscription on a wall dating from the eruption of October Vesuvius 79 - Doc.EPA

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news, #Sismologie

Activity on Kadovar in Papua New Guinea is relatively little documented by the observatories.

Since September, it seems to concern only the summit, no plume coming out of the coastal dome.

Kadovar - image 12.09.2018 Sentinel-2 image bands 12,11,4

Kadovar - image 12.09.2018 Sentinel-2 image bands 12,11,4

The Sentinel 2 images show white top degassing on September 12, and on September 22, more intense.

On the images of September 22, September 27, and October 10, it is found that the west side of the island, which had greened, is covered with ashes.

A notice of ash dispersal is issued on 28 September by VAAC Darwin.

On October 12, the plumes of ashes succeed one another, leaving a rosary of clouds towards the west, always coming from the summit.

Thermal anomalies are reported by Mirova on 14 and 15 October, respectively 17 and 22 MW.

Kadovar - 22.09.2018 - image Sentinel-2 image nat color

Kadovar - 22.09.2018 - image Sentinel-2 image nat color

Kadovar - the island covered with ashes on 27.09.2018 - image Sentinel-2 image nat.colors

Kadovar - the island covered with ashes on 27.09.2018 - image Sentinel-2 image nat.colors

Kadovar - 12.10.2018 - Sentinel-2 images respectively bands 12,11,4, and nat.colors for zoom
Kadovar - 12.10.2018 - Sentinel-2 images respectively bands 12,11,4, and nat.colors for zoom

Kadovar - 12.10.2018 - Sentinel-2 images respectively bands 12,11,4, and nat.colors for zoom

It should be noted that the Rabaul volcano Observatory reports an increase in activity on 21 September, remaining high until 26 September; Gray and brown plumes are observed several hundred meters above the summit crater, drifting to the northwest. Incandescence is reported from the main crater, southeast costal vent and other areas.

Small amounts of ash fell on Blup Blup Island.

On October 1, a plume rises to 900 meters asl, drifting westward; and on October 3, a cloud of ash is observed by satellite, drifting westward at an altitude of 2,100 meters asl. (in GVP)

Sources: Sentinel 2, VAAC Darwin and RVO / Global volcanism Program weekly report 

Kadovar - Volcanic ash advisory 28.09, 08.10, and 16.10.2018 - Doc. VAACKadovar - Volcanic ash advisory 28.09, 08.10, and 16.10.2018 - Doc. VAAC
Kadovar - Volcanic ash advisory 28.09, 08.10, and 16.10.2018 - Doc. VAAC

Kadovar - Volcanic ash advisory 28.09, 08.10, and 16.10.2018 - Doc. VAAC

 Kadovar - Radiative power at 16.10.2018 / 0h10 - DoC.Mirova Modis

Kadovar - Radiative power at 16.10.2018 / 0h10 - DoC.Mirova Modis

The Ovsicori reports an eruption on October 15 at 5:42 am at Turrialba, lasting a few minutes and accompanied by a plume of gas and ash rising to 1,000 meters above the crater.

The seismographs recorded another explosion signal at 6:16.

Subsequently, passive emissions at a hundred meters above the crater occurred.
 

Source: Ovsicori

 Turrialba - 15.10.2018 - respectively at 6h and 7h20 - webcam Ovsicori
 Turrialba - 15.10.2018 - respectively at 6h and 7h20 - webcam Ovsicori

Turrialba - 15.10.2018 - respectively at 6h and 7h20 - webcam Ovsicori

Turrialba, seen from the valley on 15.10.2018 - photo Katica Guzmán via Ovsicori / FB

Turrialba, seen from the valley on 15.10.2018 - photo Katica Guzmán via Ovsicori / FB

The assessment of the Sulawesi / Palu earthquake of September 28 has been revised ... still on the rise, unfortunately.

As of 15 October, there are 2,100 dead, 4,612 seriously injured, 680 missing, and 78,994 displaced persons.

Source BNPB

Palu earthquake - updated on 15.10.2018 - Doc.BNPB

Palu earthquake - updated on 15.10.2018 - Doc.BNPB

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news
 Piton de La Fournaise - 14.10.2018 - Maintenance by the teams of the OVPF / IPGP

Piton de La Fournaise - 14.10.2018 - Maintenance by the teams of the OVPF / IPGP

The eruption started a month ago at Piton de La Fournaise continues. The intensity of the volcanic tremor (indicator of eruptive intensity at the surface) is still very slightly decreasing.
Gas pistons  ("gas flushes" or "tremor puffs") at the eruptive site are always recorded by the OVPF seismometers.

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04h00 (00h UTC) on September 15th and 12h30 (08h30 UTC) on October 14th on the seismic station FOR, located nearby Castle Fort crater (2000 m altitude on the southeast flank of the terminal cone). (© OVPF / IPGP)

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04h00 (00h UTC) on September 15th and 12h30 (08h30 UTC) on October 14th on the seismic station FOR, located nearby Castle Fort crater (2000 m altitude on the southeast flank of the terminal cone). (© OVPF / IPGP)

Inflation (swelling) of the building is always recorded. This inflation reflects the pressurization of a localized source beneath the summit craters (Bory-Dolomieu) at a depth of 1-1.5 km, related to the recharge of the superficial reservoir by deeper magma.

Piton of La Fournaise - 14.10.2018 / 12h32 - webcam IRT / OVPF

Piton of La Fournaise - 14.10.2018 / 12h32 - webcam IRT / OVPF

Piton of La Fournaise - Lava sampling on October 14, 2018 at 10:15 am local time by an OVPF team. (© OVPF / IPGP)

Piton of La Fournaise - Lava sampling on October 14, 2018 at 10:15 am local time by an OVPF team. (© OVPF / IPGP)

A field reconnaissance was completed today. In the maintenance program and repairs of measuring stations, and samples of lava at 600m from the front of the casting.
Most of the activity is still conducted in lava tunnels, no major channel was observed and only small and rare resurgences were visible. No projections were observed at the eruptive cone and the level of the lava lake inside the vent was relatively low. A strong degassing was still present at the level of the vent as well as at the level of the main lava tunnel located just downstream

Many visitors have waited until the lava flows are visible since the Grand Brûlé, but today it is a huge disappointment that its flows on the heights of the big slopes have frozen.Il should surely a new rise of the flow of lava or a new eruption lower to see this magnificent show.

Piton de La Fournaise - 14.10.2018 - Sentinel image 2 bands 12,11,4

Piton de La Fournaise - 14.10.2018 - Sentinel image 2 bands 12,11,4

An image of the Sentinel 2 satellite of October 14 shows, thanks to the filters used, a hot spot in the active cone and another at the casting front, near the rampart

The flow front has not evolved since the last sightings and was this morning still 500m from the Great Slopes, the latter was completely frozen.

Source: OVPF - Find all the information related to the activity of the Piton de la Fournaise on the different media of the OVPF-IPGP:

- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),

- the Twitter account (https://twitter.com/obsfournaise?lang=en),

- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

The information in this document may not be used without explicit reference.

Piton de La Fournaise - Shot of the flow front on October 14, 2018 at 10:45 am local time. (© OVPF / IPGP)

Piton de La Fournaise - Shot of the flow front on October 14, 2018 at 10:45 am local time. (© OVPF / IPGP)

On 14 October, the Etna seismic network recorded an increase in the level of the volcanic tremor and seismic signals from the INGV-OE station.

The weather conditions did not allow to have a vision on the current activity.

On the morning of October 15th, the images of the LAVE webcam allow to see fumaroles under the summit, probably in connection with a small lava flow.

Correction: The steam seen on the LAVE webcam was not due to a new lava flow, but well produced by the rain falling on an old lava flow lane cooling (thanks to Pippo Scarpinati for this clarification) 

Sources: INGV seismograms and LAVE Webcam

 Etna - 14.10.2018 - seismogram ECNE_HHZ_IT.0001 / INGV Catania

 Etna - 14.10.2018 - seismogram ECNE_HHZ_IT.0001 / INGV Catania

Etna - 15.10.2018 / 7h28 - Fumes of a probable lava flow - webcam LAVE

Etna - 15.10.2018 / 7h28 - Fumes of a probable lava flow - webcam LAVE

The Sangeang Api, which forms a small island 13 km wide in the Lesser Sunda islands, off Sumbawa, is in episodic activity.

Beautiful photos of his Strombolian activity between 28th and 30th September have just been put on line on the page Volcanoes and volcanism / Facebook by Martin Rietze ... superb as always!

Source: Martin Rietze / Volcanoes and volcanism

Sangeang Api - 30.09.2018 - Strombolian activity - photo Martin Rietze / Volcanoes and volcanism

Sangeang Api - 30.09.2018 - Strombolian activity - photo Martin Rietze / Volcanoes and volcanism

Sangeang Api - 30.09.2018 - Strombolian activity - photo Martin Rietze / Volcanoes and volcanism

Sangeang Api - 30.09.2018 - Strombolian activity - photo Martin Rietze / Volcanoes and volcanism

Sangeang Api - image Sentinel-2 image bands 12,11,4 from 27.09.2018 - we can see a light blue plume

Sangeang Api - image Sentinel-2 image bands 12,11,4 from 27.09.2018 - we can see a light blue plume

 Sangeang Api - Seismicity at 14.10.2018 - Doc.Magma Indonesia

Sangeang Api - Seismicity at 14.10.2018 - Doc.Magma Indonesia

Lire la suite

Publié le par Bernard Duyck
Publié dans : #Volcanic news

The eruption started at Piton de La Fournaise on September 15th at 4:25 am local time continues. The intensity of the volcanic tremor (indicator of eruptive intensity on the surface) is always slightly lower.
Gas pistons ("gas flushes" or "tremor puffs") at the eruptive site are always recorded by the OVPF seismometers.

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04h00 (00h UTC) on September 15th and 14h00 (10h00 UTC) on October 13th on the seismic station FOR, located nearby Castle Fort crater (2000 m altitude on the southeast flank of the terminal cone). (© OVPF / IPGP)

Piton de la Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 04h00 (00h UTC) on September 15th and 14h00 (10h00 UTC) on October 13th on the seismic station FOR, located nearby Castle Fort crater (2000 m altitude on the southeast flank of the terminal cone). (© OVPF / IPGP)

No volcano-tectonic earthquake was recorded during the day of 12 October, nor of the 13th.
Inflation (swelling) of the building is still recorded even though it seems to have slowed down for three days. This inflation reflects the pressurization of a localized source beneath the summit craters (Bory-Dolomieu) at a depth of 1-1.5 km, related to the recharge of the superficial reservoir by deeper magma.
Surface flow rates could not be estimated today because of poor surface flow and cloud cover on site.
Observations made on the evening of October 12th from the observatory's webcams (aiming in particular at the base of the Tremblet's Nez Coupé), during a gap in the cloud cover, showed that the flow front did not seem to have progressed significantly since the last observations of October 08 (before the deterioration of weather conditions on site) and was maintained at the top of the Great Slopes.


Some beautiful images of the lava flows, filmed in the rain on September 30, ... in the absence of photos of the last days due to bad weather.


Sources:

- OVPF - 

Retrouvez l’ensemble des informations relatives à l’activité du Piton de la Fournaise sur les différents médias de l'OVPF-IPGP:

- le site internet (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),

- le compte Twitter (https://twitter.com/obsfournaise?lang=fr),

- et le compte facebook (https://www.facebook.com/ObsVolcanoPitonFournaise/)

Les informations de ce document ne peuvent être utilisées sans y faire explicitement référence.

- Video from Ced Northman, whom I thank for sharing.

Beautiful lava flows ... we want more !

Third (and last?) Episode of the current eruption at Piton de la Fournaise, Réunion on 30 September 2018 / by Ced Northman. A week after filming many forms of lava channels, this time it was much more of a mess! A generalized overflow of pahoehoe lava, due to a small resurgence supposedly on the east flank. Lava tubes, lava rivers, lava floods, lava falls! - a link to his first two documentaries at the end of episode three.

Piton of La Fournaise - 13.10.2018 / 19h02 - webcam IRT / OVPF

Piton of La Fournaise - 13.10.2018 / 19h02 - webcam IRT / OVPF

The "Caverne Gendarme" lava tunnel, located at the Brûlé from the table to the Îlet aux Palmistes / commune of St Philippe, constituted the framework of tests of Comex space with a view to lunar expedition. This tunnel developed in a casting dated 18th century outside caldera.

A summary of these tests is visible on the Imazpress / Objectif Lune website: the island could host astronauts.

Merapi - growth of the dome between 18.08 and 11.10.2018 (photo growth between 04 and 11.10.2018) - Doc.PVMBG

Merapi - growth of the dome between 18.08 and 11.10.2018 (photo growth between 04 and 11.10.2018) - Doc.PVMBG

The growth of the Merapi dome is continuing ... on 11 October, the volume of the dome was 158,000 m³, with a daily growth rate of 3,100 m³, a little higher than at the end of September.

The dome is described as stable, although there is a slight outpouring on the north side.

It is marked by a thin, white fumarole 70 meters above the summit.

The activity level remains at 2 / waspada, with a prohibited area of ​​3 km.

 

Sources: PVMBG & Magma Indonesia

Merapi - mist and light fumarole on 12.10.2018 / 13h30 - webcam PVMBG

Merapi - mist and light fumarole on 12.10.2018 / 13h30 - webcam PVMBG

In Fuego, the rise in activity level has no duration.

Fuego - Insivumeh report 13.10.2018 / 10am local time

The RSAM shows a decrease on 13 October, and weak to moderate explosions with a lower ash column, then relayed by a white degassing from a height of 1,000 meters above the summit, and a lava flow in the Barranca Seca of reduced length to about 200 meters according to the Conred.

Evolution to follow

Sources: Insivumeh 13,10,2018 / 10h local and Conred

Fuego - 13.10.2018 - white degassing - photo William Chigna, Unity of Prevención de Volcanes - UPV / via Conred

Fuego - 13.10.2018 - white degassing - photo William Chigna, Unity of Prevención de Volcanes - UPV / via Conred

At Turrialba, the Ovsicori reports an eruption on October 13 from 7:50 am, accompanied by a plume of ash 500 meters above the active crater. The activity is in progress.

Source: Ovsicori

Turrialba - 13.10.2018 / 7:59 - webcam Ovsicori

Turrialba - 13.10.2018 / 7:59 - webcam Ovsicori

Lire la suite

Articles récents

Hébergé par Overblog