I mentioned the SISZ earlier, as it is one of the clearest examples of polygons marked by the mantle convection cells. The balanced conditions within the ductile part of the tectonic plate lead to earthquake faults exactly in between the symmetrical lines around it to the NW, NE, SW and SE. The faults are therefore aligned NS.
In this way it becomes much easier to analyze every feature of earthquake zones of this kind. The reasons for pressure directions become clear. In this case, pressure is exerted from NE and SW. NS-faults are drawn with 715 meters interval along the 64th parallel.
Published by Steingrimur Thorbjarnarson
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 