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Fuji in Japan and Hawaii have similar relation to the main division lines of lower mantle. Therefore they are found 60° apart, as shown on this drawing:

Both areas are located on up-welling lines. The main chain of Hawaii spans 30° from east to west, from Hawaii Island itself to the southern end of the Emperor Chain. The background of that turn is therefore more complex than most people think (the common explanation that the tectonic drift just made a turn one day due to changes elsewhere). Today, the Hawaii chain seems to be developing southwards. The drawings of convection rolls represents a vertical section of the rolls. The ridge extending south of Japan is therefore one of the main manifestations showing the location and shape of the convection rolls within the mantle. The detailed analysis has to be made with the map of the upper-most convection rolls, understanding the implications within the volcanic areas of Japan and Hawaii Islands. But with this general section in mind, the exceptional volcanism of Japan and Hawaii becomes much easier to understand. Note that the volcanism in Hawaii has to be explained according to at least two small scale rolls, spanning 2×1.5° from east to west. The volacanism is found where certain conflict is found between the large scale convection roll of Central Pacific and the general tectonic drift direction. Once the sea floor is pulled over to the convection roll west of the volcanic islands, volcanism ceases.

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.

The ridge south of Japan follows the line accurately.

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.

Another example of how the topography follows the division lines of convection rolls along equator is Indonesia. It spans 30° from east to west, just like South America. Also, the two points of east and west have exactly the correct position as compared to S-America. We find steps of 30° around the world!

So this pattern is obvious. The up-welling line is found at the western point of the 30° string, extending farther to the south where you find Krakatoa, one of the most famous volcanoes in the world. Therefore, behind the trench and relevant geology, there are geophysical preconditions we should look into.

The string length along equator over S-America and Indonesia is exactly the same. Both span 30° out of the 360° of the whole of equator. Besides that, the two strings are found exactly opposite to each other as shown in the drawing above. It should be enough just to point this out, so everyone can see that this can be no coincidence. This distribution is also consistent with the convection rolls model, with the width of the convection rolls underneath being the same as the height. By noticing this, we add to our possibilities to understand the functions of the Earth, on which we live.

The Amazon basin is aligned predominantly west–east, and the Amazon estuary lies on the Equator. According to the convection-rolls model, this estuary is situated on a major downwelling division line between large lower-mantle convection rolls.

In addition, 30° westward along the Equator from the Amazon estuary lies the west coast of South America, where a deep oceanic trench is present. This trench corresponds to another division line of large scale lower mantle convection rolls associated with the implications of uppermost mantle convection rolls of the asthenosphere.

South America spans roughly 30° of longitude along the Equator, from the Amazon estuary to the Pacific margin. This is followed by an approximately 60° longitudinal span along the Equator across the Atlantic Ocean to Africa (with the Mid-Atlantic Ridge in the middle, and therefore we have two 30° steps across the ocean), and then a further 30° span from the west coast of Africa to the Great Rift Valley. At each of these longitudinal intervals, a division line between major lower-mantle convection rolls can be identified.

The Amazon River, marked approximately by a blue line, closely follows the equatorial parallel and appears to be structurally guided by this deep mantle boundary. This spatial correspondence suggests that large-scale mantle convection geometry exerts a first-order control on continental-scale river systems, plate boundaries, and major tectonic features.

The SE edge of Vatnajökull is lineray oriented to the NE from Öræfajökull Volcano. This edge is formed by a line of mountains, which ar found above the easternmost up-welling mantle division lines crossing the country in that direction. Geothermal heat is found in the valleys, and the more the glacier retreats, the more has been found.

The calculated division line coincides with the mountains forming the edge of the glacier. It has been found that the number of dikes is high in the area and geothermal activity quite appearent. This up-welling, along the upper most line of 120 km depth, and the third layer as well farther down (below 265 km) is also up-welling, and almost coincides with convection layer 1, adds to the effect.

Vatnajökull: https://www3.uef.fi/documents/640649/725289/NEED+V_New+Geo+Review.pdf/273c6abe-cf05-4c36-92cb-a5cc3fdaf930