This grid can be used for reference, explaining tectonic features of Iceland.
Having a closer look at Reykjanes Peninsula:
Reykjanes Peninsula and the SW part of Iceland
The Icelandic Met Office
The division lines of layer 2 and 4 between 120-410 km below the surface cross the earhquake swarm from SE to NW. A volcanic system and a seismic zone are also found within the area.
I have a BS degree in geology and provide this website about my analysis of convection rolls in the Earth's mantle and how they affect the surface.
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