.. something to worry about? The magma from Iceland's Bardarbunga volcano could be moving towards another large volcanic system.
Data recorded by a team from the University of Cambridge suggests that 50 million cubic metres of molten rock has moved in the last 24 hours.
If it continues on a northern trajectory it could feed into the Askja volcanic system, potentially triggering a large eruption.
Prof Bob White said: "It's headed straight for it."