The extinct volcanic zone of Skagafjörður tells a story about the double nature of volcanism in Iceland in general. The eastern North Volcanic Zone has taken entirely over the volcanic and rifting functions.
The coherence between the South Iceland Seismic Zone and Tjörnes Fracture Zone becomes more appearent when comparint its location with the Skagafjörður volcanic Belt. The Tjörnes Fault Zone can be regarded as an EW-trending.
The large scale axis from Snæfellsjökull to Snæfell provides a connection to practically all the volcanic zones (and those classified as volcanic belts).
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 