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The NVZ compared to EVZ and WVZ. Why the difference?

At around the 64° 45’N parallel a shift is found between the East Volcanic Zone and the North Volcanic Zone. The zones are connected at the Kverkfjöll area, but south of there the volcanic systems trend NE-SW, whereas north of there the NS alignment is obvious. Looking at the grid formed by convection division lines, this becomes more understandable. Along this parallel the grid is transformed from being composed of large and regular diamond shaped polygons south of the line, into the rather complex matrix of much smaller polygons. The overall match between volcanic zones and convection cell grid is obvious. The relevant lines are drawn on a map from Náttúrufræðistofnun:

Norður-gosbeltið 01

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