Mt. Fuji in Japan is a symbol of all volcanoes, and is very strategically located on one of the six main up-welling lines of the World.
Fuji is located on up-welling mantle line
The ridge south of Japan follows the line accurately.
Fuji and the convection rolls division line
This shows that the trench system spans 3° from east to west, beginning with a local down-welling of upper mantle at 120 km depth, and the seafloor seems to be engulfed by the main division line of lower mantle, resulting in shaping the western edge of the ridge, besides Mt. Fuji.
The local upper mantle down-welling line is directly above the large-scale lower mantle up-welling line, resulting in a contraversy between large-scale tectonic drift and local trend.
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.
View all posts by Steingrimur Thorbjarnarson
Magic Magma 