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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