These movies from April 17th, 2010 (top row) and April 19th, 2010 (lower row) complement the still photos taken by Marco Fulle during the same helicopter flights.
Phreatomagmatic activity from Eyjafjallajökull's summit crater.
Note ash plume drifting off into the distance.
Note dark ash clouds surrounded by white steam clouds from evaporating glacier ice.
Overwiev of the eruption site; note pressure waves from the vent expanding at the speed of sound.
The pressure waves are particularly well visible in these sequences.
Zoom on the vent ejecting incadescent lava; note large bombs in ballistic trajectories.