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Tjörnes Fracture Zone Double Nature

Steingrimur Thorbjarnarson

To be able to analyze the Tjörnes Fracture Zone, first it has to be realized that it extends from Skagafjörður to Skjálfandi, and in the East and West coincides with two different volcanic zones. The western volcanic zone of the North, Skagafjörður Volcanic Belt, is actually neglected by most geologists, because it is volcanically extinct. Still it exists seismically, as shown here.

Tjörnes Fracture Zone within the settings of the active North Volcanic Zone and the extinct Skagafjörður Volcanic Belt.

Recently, many earthquakes occurred at Reykjanes, and now within the Tjörnes Fracture Zone. Here, the convection rolls division line of Reykjanes is pointed out, to show how it divides the TFZ into two areas, east and west of the line. The earthquakes start on the line, and then start spreading along the Kolbeinsey Ridge.

Here I point out: https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2000TC900022

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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.

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