Katla is a mystery, because no one has seen the volcano. Now we can detect it easily with modern technology through the ice sheet of Mýrdalsjökull, but somehow it remains obscure.
The division lines between convection rolls crossing below the mountain are marked on the map below. The black line is a downwelling line of the upper most layer, and the red line is upwelling line of the second layer.
Many of the most famous active areas in Iceland are found along these lines. That is in accordance with the activity of Katla – surprising everyone each time it erupts.
Published by Steingrimur Thorbjarnarson
I am a geologist, graduated from the University of Iceland, and taught geology for a few years. I have gained some knowledge about Earth's inner structure, so I provide this website as my contribution to answer one of the greatest questions remaining within the realm of geoscience. Experiments show that the mantle should form convection rolls when close to the melting point. I took this literally, and calculated the dimensions and shape of these mantle convection rolls. Then I compare that model with the surface. This makes it possible to provide many interesting examples about geology found on my blog.
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Magic Magma 