Geologists focus on one volcanic zone of North Iceland, the one extending from Askja to Öxarfjörður. The Skagafjörður volcanic zone is still active, as earthquakes occasionally show, and Hofsjökull might be a part of it still active. Again, we can compare model and real circumstances:
Skagafjörður and Öxarfjörður are 3° apart, having same arrangement of convection rolls
The accurate consistency between model and surface features is one more reason that the convection rolls of the model are correctly calculated.
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 