According to a news report an early result from a field study into Öræfajökull volcano eruptions in 1362 and 1727 suggest that those eruptions where possibly larger then previously thought.
According to the research so far the following has been discovered.
- Volcano ash layers from the eruption 1362 are 3 meters thick. They where thought be around 0,5 meters thick. This suggests that the eruption in 1362 was larger than previously thought.
- The craters from the eruption 1727 have been found. That eruption was close to the Fimmvörðuháls eruption in Eyjafjallajökull volcano in 2010 (not under glacier eruption).
- Pictures of the magma that has been found suggest that both eruptions where highly felsic (rhyolitic) type and high in gas content. There are also high in crystals (known as crystallization of magma). What type of crystals is not known at the moment (not mentioned in the news).
That fact does explain the current process of earthquakes in Öræfajökull volcano and why earthquake activity drops down to almost nothing every few weeks in Öræfajökull volcano. The magma in Öræfajökull volcano is slow moving and there is a lot of it. Current volume is around the same that started the eruption in Eyjafjallajökull volcano in 2010 (there are massive differences between the two, so comparing the volcanoes is subject to limitations).
Icelandic News from Vísir.is
Fyrri eldgos í Öræfajökli mun öflugri en áður var talið (Vísir.is, Video, images, Icelandic only)
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This is the daily Bárðarbunga volcano update. If you wonder why I write this every day even if there are no major changes there is a reason to it. There is an eruption taking place and there is always something going on. There are more notes about other things at the end of this article.
Current status in Bárðarbunga volcano on 9-October-2014
- Largest earthquake today had the magnitude of 5,2, it took place at 21:22 UTC. Second largest earthquake today took place at 04:37 UTC and it had the magnitude of 5,0.
- There is increased activity over the dyke origin area in Bárðarbunga volcano. Largest earthquake so far had the magnitude of 4,8 at 19:13 UTC today. I don’t think this is a good sign, since it appears to me that more magma is trying to get into the dyke. The dyke is however not wide enough to take in all this new magma that is trying to pressure its way into it. So it is now trying to expanding it at is starting point. If that expansion of the dyke fails the magma is going to start looking for new way out. What path the magma is going to go is not possible to predict. When the formation of new dyke starts, there is going to be a new earthquake swarm with thousands of earthquakes as happened from 16-August to 29-August when the eruption started.
- Bárðarbunga volcano caldera continues to drop even if the magma pressure is increasing. I don’t know why that is. The caldera is not going to collapse until most or all of the magma leaves the magma chamber holding it up. Until then it is going to stay up. When the magma finds a path out of the magma chamber it is going to start a large eruption that is only going to last 60 – 75 hours (less than a week). Until then it is going to be more of the same. New dykes forming and sometimes erupting.
- Bad weather has prevented me from seeing anything on the web cameras. I have also not heard anything about the lava field current status on the news today.
- Today there was more earthquake activity along the dyke then yesterday. Suggesting increased pressure in it, as would be expected since I am seeing more pressure in the magma system (based on earthquake activity).
- Nothing else to report far as I know.
The ring fault in Bárðarbunga volcano
The ring fault that has formed in Bárðarbunga volcano can clearly be seen on this image today from Icelandic Met Office.
The ring fault in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.
Bárðarbunga volcano is a Stratovolcano (Wikipedia information can be found here) on a rift zone setting. This means Bárðarbunga volcano is able to erupt normal explosive eruptions at times (rhyolitic type eruptions), since magma can be mixed inside the volcano over a long period of time. I don’t think that is going to happen now, since there doesn’t seems to be any such magma in Bárðarbunga now. Since current activity happened without warning and that has not allowed any magma to evolve inside Bárðarbunga volcano magma chambers. As for Bárðarbunga volcano caldera collapse, information about how and why that is happening is explained here in general terms. As I said above, for as long there is magma inside the magma system that holds the weak area up it is going to stay where it is.
If anything major happens in Bárðarbunga volcano. I am going to write a new article or update this article with the latest information.
please note that I am in the process of moving back to Iceland. The moving date has been set in December. Until then I am just slowly packing my stuff down into boxes and ordering the transport for my stuff to Iceland. I am also trying to save up some money for the transport cost so I don’t have to take a large loan with my parents for this move back to Iceland. This also means that my geophone in Denmark is going down tonight. The website for it won’t go away right away. The image is going to be replaced with a test card.
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If there is a theory or idea that sounds just too crazy to be true. It is just that. Nature has its own rules and laws that it follows, even if we don’t understand them all. That is still what the nature does, even when it comes to eruptions. The best idea when it comes to crazy ideas is to ignore them. It is also important to know that nature ignores all crazy ideas anyway and does what it pleases to do. Regardless of any human idea about how nature works. I write this since I have been hearing a lot of crazy theories and ideas about Bárðarbunga volcano. Almost none of them have basis in fact, others are just twisting the facts and creating something unrealistic in the process.
In the Icelandic news today there is a article about new study on the deep Reykjanes Ridge. According to that that study an eruption took place deep on the Reykjanes Ridge sometimes in the past 20 years. Following this eruption a sharp and strong earthquake activity took place at this same location. No signs of this eruption where visible on the surface of the ocean. At this location the depth is around 2 to 3 km. The unnamed volcano is at around the location at 61N degree north, this makes the location around 400 to 500 km from land. The study did compare scans of the ocean floor at this location taken in the year 1994 to new ones taken in the year 2013. This newer scans clearly showed that eruptions had taken place in the time period between those scans of the ocean floor. It is not known when this eruptions took place or how large they where, or for how long they lasted. There have been earthquakes swarms at this location in the past 20 years. I don’t know if that is a sign of new eruptions at this location. It is also extremely difficult to confirm any new eruptions at this location if such event took place after last scientific study into this area.
More information in Icelandic
Sjá merki um eldgos á Reykjaneshryggnum (mbl.is, map of volcano, Icelandic)
Áður óþekkt eldgos á Reykjaneshrygg (Rúv.is, Icelandic)
Updated at 14:48 UTC.
Updated at 15:09 UTC.
Updated at 15:11 UTC.
In an recent study mission on Reykjanes ridge they did discover new volcanoes. What was discovered is that there appears to be more earthquake activity outside the main rift zone than originally thought. They also found volcanoes that are up to 2000 meters high (from the ocean floor) and have some other oddities too. At this south part of Reykjanes ridge there is an fault zone at the south end of it. According to the news the Reykjanes ridge is now about to break it soon (in the next few million years) and extend it’s reach more south. This area of the Reykjanes ridge appears to be high in volcano activity, a lot more then previously thought. All of the volcano activity at this location goes unnoticed due to how remote this area is and how deep the ocean is at this location.
I don’t know what this fault zone is named. But I think it’s this one on Google Earth.
View Larger Map
Rúv News in Icelandic. Beware of Google Translate.
Ísland teygir sig lengra suður (Rúv.is)
Blog post updated at 23:41 UTC.