It has been noticed that rifts have opened up in the area of Tungnafellsjökull. At the same time, Bárðarbunga has been quite active. According to the layout of the grid of Munroe lines feeding the volcanoes, it looks likely that magma actually flows from the line through Tungnafellsjökull into the magma chamber under the caldera of Bárðarbunga. The flow would follow this arrow:
The magma did flow a long way until the eruption of 2014 in Holuhraun started. As shown in former blog post:
Magic Magma 