We relate the Reykjanes Peninsula to the Reykjanes Ridge. It is so obvious that the peninsula is a continuation of this part of the huge Mid-Ocean Ridge of the Atlantic. But looking below the crust, things become somewhat different. The convection rolls of Reykjanes are subducted by the Kolbeinsey Ridge Convection Rolls, and therefore the magma now flowing as lava at Fagradalsfjall is not the same as that of the main part of the Reykjanes Ridge.
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The subduction can be shown graphically as here below:
The two systems of convection rolls intersect between 60.7°N and 67.3°N, and the northern rolls are found over the southern ones.
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 