Tahiti is amazingly far away from any mainland. It can be compared with Hawaii, because it has a hot spot at Mehetia. The drift of the Pacific Plate creates a chain of islands. The calculated value of directions can be achieved in the same way as for Hawaii:
This is very close to the measured value of tectonic drift, that is N65°W.
The relevant convection rolls division line is found directly under Mehetia.
Here is the calculated value for Hawaii, for a quick comparison 🙂 Note that the calculations are double for Hawaii (NW and NE trending vectors), because the symmetric effect of the two convection rolls layers appears clearly.
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 