There is a possible plume of magma ueradnenth Iceland. But according to scientists this plume is only about 150km wide. So, it is centered close to Bardarbunga and Grimsvotn and in theory can affect Askja to the north, Oraefajokull to the south, and Katla, Eyjafjallajokull, the dead zone and Hekla to the west, at its edge. But it shouldn't reach towards Reykjanes, unless magma could find a way there at big depths.I think this plume is what explain the enhanced volcanism in Iceland compared to the rest of the Atlantic ridge. And this plume has a postulated (not fully confirmed) cycle of increased volcanic activity about every 120-170 years. When this peak is reached, there are more eruptions in Iceland and stronger, especially under Vatnajokull. The next peak is somewhere within the next decades. But this is not fully understood.