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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:

The three main mid-ocean ridges aligned NS are separated by about 90° along equator. The division line of upper mantle directly above lower mantle division is according to analysis a downwelling one, so ocean ridges do not tend to appear exactly there. A good example is the Reykjanes Ridge, following the path 1.5° to the west of the main division of lower mantle. Therefore, the three ridges are as close to being 90° apart along equator as the system allows.

This is of course the theoretic distribution. The Mid-Atlantic Ridge is magnificent. But it is under the ocean like the other ridges.

China is very large and has a double nature, namely the Eastern and the Western parts. The division can be compared to the convection rolls, taking tectonic drift direction into account. The intersection between two circular zones divides China into two totally different parts. The border between China and India/Nepal is shaped exactly like the coastline of China. The amazing result is that most of Chinese territory is found within two circular effect zones with exactly the same radius, intersecting each other.

中国领土主要分两部分，东部和西部。这两个地区可以用两个圆圈来画出来，而东部圆圈的直径位于北纬32°。显出东部和西部两个圆圈直径是一样的。中国东部的北方和南方也可以这样分明，因为长江也接壤北纬32°。

To fully understand this you must take all the Eurasian Plate into account.

Resulting in this simple drawing:

Please compare and find out more.

China, like other areas, has been gradually shaped by the tectonic drift of the continents. But at every moment in Earth’s history it is possible to compare the surface with the magma currents underneath. China has been formed in a particular way, and referring to the convection cell pattern it can be clarified further.

The perfectly circular shape of the SE coast of China is centered at the main division line of convection cells, exactly at 32°N where the mantle rolls are oriented NS.

Katla and Eyjafjallajökull are the southernmost volcanoes, except for the Westman Islands. The framework extending from Hekla to Katla, along with Eyjafallajökull and Torfajökull exhibit the main tectonic fault directions. Usually we emphasize on the alignment of the Eastern Volcanic Zone in general (to the NE), but a simplified drawing of the polygons formed by the convection rolls look like that:

What is specially pointed out here is the connection of Katla with Torfajökull. The light coloured area shows two different alignments, originated from the NS-axis of the polygon. The NW trending faults are mirrored against the NE faults, having the same deviation from North, in opposite directions. The Torfajökull area is in a way confined south of the EW central polygon axis.

This interplay of EW-NE-NS-ES factors and even combinations of these have to be screened to understand the tectonics and distribution of volcanic sites. As previously mentioned, Hekla itself is askew with the system, but it can also be easily calculated like the rest of the southern features.