The main volcanic zones of Iceland can be divided into two different parts as shown on the map below. The lines representing the convection rolls model are superimposed on the map found on Wikipedia.
The best known volcanic zones are probably the West Volcanic Zone (WVZ) and the East Volcanic Zone (EVZ). The EVZ is often seen as covering five polygons, but more advanced analysis includes a distinct South Iceland Volcanic Belt (SIVB), where proper rifting process does not occur. The Westman Island (WI) are formed within a single polygon, extending from the SIVB. The Reykjanes Oblique Rift Zone (RORZ) is mainly associated with the Reykjanes Peninsula, but here the extension on the seafloor is seen as the second half of the volcanic zone. The Öræfajökull Volcanic Belt extends over two polygons in a very decisive way, in between the two volcanic sites of Öræfajöull itself at the southern end and Snæfell at the northern end. Then we still have to account for the Snæfellsnes Volcanic Belt (SVB), which can not be defined as clearly as the other volcanic zones within the context of polygons. On the other hand, Snæfellsjökull Volcano at the western end of that zone is exactly on the same latitude as Snæfell of the ÖVB, found in context with a division line in a mirrored way. Therefore, the similarities between SVB and ÖVB become quite suspicious. The Grímsey Oblique Belt is poorly known in the geological literature, but it resembles the RORZ very well, in has functional similarities. The Mid Iceland Belt (MIB) is found within one polygon, but it was connected with the now volcanically extinct Skagafjörður Volcanic Belt (SKVB). The North Volcanic Zone is found within a tighter network of convection rollls division lines, so the outer limits are not clearly defineable. but can be roughly divided into two sections, with the Mývatn area found in between. The Reykjanes Ridge then extends along many polygons to the south-west. https://en.wikipedia.org/wiki/Volcanism_of_Iceland
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