The effusive eruption of the volcano continues from all fissure vents. he activity continued at stable levels and then began to fluctuate.
The spatter cone started to erupt taller-than-usual lava fountains of up to perhaps 1000 feet in height characterized by regular pulsating at intervals of 7 to 10 minutes. Emissions of gas and steam plumes were dispersed about 100 feet to the southwest of the eruption site.
The reason of this change in the activity is not clear yet, but the discharge rate of this eruption seems rather higher compared to most previous eruptions of the eruption site likely caused by magma/gas composition change at shallow level.
Source: Icelandic Met Office volcano activity update 3 May 2021