The volcanic and geothermal activity of New Zealand coincides with the Havre Trough, where the Pacific Plate is subducted under Zealandia, as explained here: https://en.wikipedia.org/wiki/Geology_of_New_Zealand
According to my analysis, main division line of the convection rolls system passes New Zealand and affects the trough, explaining anomalies in the area.
High temperature activity area of New Zealand.
The width of the area fits above one convection roll, just like the Icelandic volcanic zones. Therefore, to understand the geothermal activity of New Zealand more thoroughly, the mantle convection currents should be taken into account.
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 