Actividade Vulcânica 2017

[luismeteo3]

Öræfajökull 17. nóvember 2017. Ágúst J. Magnússon.
A new ice-cauldron in Öræfajökull volcano

17.11.2017

New satellite images of Öræfajökull volcano shows that a new ice-cauldron has formed within the caldera in the last week. Pilot flying over the area took pictures of the cauldron today and sent them to the Icelandic Meteorological Office. The cauldron is about 1 km in diameter and it reflects a recent increase in geothermal activity within the caldera.

It seems that geothermal water has been slowly released from underneath the cauldron to the glacial river of the Kvíárjökull outlet-glacier (SE flank of Öræfajökull volcano). Associated with this water release sulphur smell has been reported nearby Kvíárjökull since last week. Most of the water has probably already been released. An increase in the seismic activity has been recorded for the last few months, but for the past days it has been low. This data indicates increased activity of the volcano which has not erupted since 1727. Currently there are no signs of an imminent eruption.

The Icelandic Coast Guard will fly over the area with scientists tomorrow to collect additional data and samples. The Icelandic Meteorological Office has increased the surveillance of the area and is monitoring the volcano closely in collaboration with scientists from the University of Iceland and the Icelandic Civil Protection Authorities.

The Icelandic Meteorological Office has in light of this elevated activity raised the aviation color code for Öræfajökull to yellow.

Landsat image from 17 November 2017.

Landsat image from 1 November 2017.
http://en.vedur.is/about-imo/news/a-new-ice-cauldron-in-oraefajokull-volcano

 

[luismeteo3]

Uncertainly level declared for Öræfajökull volcano, aviation code moved to yellow alert
Posted on November 18, 2017 by Jón Frímann
Yesterday the Department of Civil Protection and Emergency Management declared uncertainty level for Öræfajökull volcano. Aviation colour code was also moved up to yellow alert level (can be viewed here).

Current status is that a ice cauldron has formed in the centre of the Öræfajökull volcano caldera. It is about 1 km wide and around 21 to 25 meters deep according to early measurements. This is the first time in documented history that such ice cauldrons has formed in Öræfajökull volcano. It is now believed that the ice cauldron has been emptying it self all week resulting in smell of sulphur in Kvíá glacier river. The glacier river can be viewed here on Google Maps Street View. Currently there is not a lot of earthquake activity happening in Öræfajökull volcano. This is to be expected (I guess). It is also worth noting that Öræfajökull volcano did do in few months what took Eyjafjallajökull volcano 16 years to do until an eruption happened.

There is not a lot of details on earlier eruptions from Öræfajökull volcano. Earliest eruption to our in time took place between 1727 and until 1728 (289 years). Before that an eruption took place in 1362 (655 years) and lasted for five months. Currently I don’t have a lot of information about the current status. This is due to lack of measurements as it was not expected that Öræfajökull volcano would do this even if earthquake activity was happening in the volcano. It was only from October (it seems) that it was figured out that something was going on in Öræfajökull volcano.


No earthquake activity in Öræfajökull volcano during the past 48 hours.

More news regarding Katla..

Two cauldrons were spotted there today during a flyover.
Conductivity in Múlakvísl is at an all time high, nearing 600 uS/cm

www.jonfr.com

 

[luismeteo3]

There was also inflation found in Öraefajökull volcano.
http://www.mbl.is/frettir/innlent/2017/11/10/thekktar_eldstodvar_ad_thenjast_ut/

There seems to be a link between Öraefajökull and the Eastern Rift Zone.
https://link.springer.com/content/pdf/10.1007/s00410-013-0959-1.pdf

 

[luismeteo3]

Artigo excelente como sempre... deixo aqui as conclusões:

Conclusion and thoughts

Öraefajökull from air.

It is important to once more state that volcanoes can have large intrusions that does not cause eruptions.

But, as I said in the beginning, this is a volcano that I do not want to see erupt. Because this is as far as we know the most dangerous volcano in Iceland for the local inhabitants. I am though certain that the competent Icelanders can solve the problems with eventual evacuations of both people and animals before an eruption occurs. It would still though be an economic disaster for the country.

The reason for it being so dangerous is that the magma type it erupt is highly prone to be explosive, and we do know that it is full of volatile gases and that it is hotter than usual. This is a bad recipe, nobody likes turbo-charged rhyolite.

The second problem is the lack of knowledge and historical records of how the volcano behave prior to an eruption. The small few things we do know indicates that the current behaviour is how the volcano behaves prior to an eruption, but that there can be decades long waiting time from reactivation to the final eruption.

And due to our technical knowhow, we do not only face a potential disaster stretching 160 or more kilometres in south eastern Iceland, we also risk losing the ability to fly for weeks or even months. Because this would be a very ashy history indeed.

One way to try to comprehend Öraefajökull is to go beyond the scope of Iceland, because it more resembles a large subduction resurging caldera, than the typical Icelandic volcano. Yes, it is not going to super-erupt, but it will produce a similar eruption on a smaller scale with similar characteristics.

I still hope that the volcano will calm down, but if not, I wish all the people in the region the best possible outcome. I know that the Icelandic authorities are the best in a crisis, so they are in good hands. Remember, better to be safe than sorry for eternity.

CARL REHNBERG
http://www.volcanocafe.org/oraefajokull-a-challenge-for-volcanology/

 

[luismeteo3]

Está a começar uma crise sísmica no vulcão Öræfajökull. Para já pequena... Só para lembrar que este é o quarto maior vulcão activo na Europa!

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/vatnajokull/

The four step evacuation plan the police is currently working with in case things start to heat up, stuff will be added and more finely tuned as more info comes along from scientists, locals and other authorities

Step a:
• Roads leading from highway 1 closed
• External closures installed
• Closures will be at Lómagnúp in the west and Jökulsárlón in the east
• Only residents, scientists, emergency services, transports and other necessary traffic are allowed to enter the area
• Transfer of livestock prepared

Level b:
• All tourists and others who do not need to be in the area should leave it
• Livestock moved away
• Block all traffic into the area other than for emergency services and scientists

Level c:
• Full evacuation of the area

Level d:
• Closures moved west and east with respect to forecasts of ash fall
• Evacuation area re evaluated with respect to forecasts of ash fall



http://www.visir.is/g/2017171118713/rymingaraaetlun-utfaerd-med-hjalp-ibua-vid-oraefajokul

 

[luismeteo3]

 

[luismeteo3]

Civil protection is now saying flooding can reach humam settlements in 20 minutes.

 

[luismeteo3]

Civil protection is now saying flooding can reach humam settlements in 20 minutes.

http://www.ruv.is/frett/flod-gaeti-nad-mannabyggd-a-20-minutum

 

[luismeteo3]

http://hraun.vedur.is/ja/drumplot/drumplot/fal_highpass_2.0.png

 

[luismeteo3]

 

[luismeteo3]

 

[criz0r]

@luismeteo3 excelente pesquisa como sempre

Só para complementar, de acordo com o que estive a 'cuscar', este Vulcão é um Estratovulcão Sub-Glacial dos muitos que existem na Islândia.
Tem um histórico de erupções VEI4 em 1728 e VEI5 em 1362 ambas com registos de inundações derivadas do degelo de parte do Glaciar Vatnajökull.

Julgo que o membro @irpsit pode elucidar-nos melhor acerca deste Vulcão.

 

[luismeteo3]

@luismeteo3 excelente pesquisa como sempre

Só para complementar, de acordo com o que estive a 'cuscar', este Vulcão é um Estratovulcão Sub-Glacial dos muitos que existem na Islândia.
Tem um histórico de erupções VEI4 em 1728 e VEI5 em 1362 ambas com registos de inundações derivadas do degelo de parte do Glaciar Vatnajökull.

Julgo que o membro @irpsit pode elucidar-nos melhor acerca deste Vulcão.

Muito obrigado! A erupção de 1362 foi de VEI6 similar á erupção do vulcão Pinatubo.

 

[luismeteo3]

 

[luismeteo3]