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The summit craters represent the junction area of the volcanic activity through which breathes the persistent vent of Etna, and in more or less regular intervals, are the site of explosive events of various types as: Strombolian obstruction phreatic activities etc. that continually change the morphology.
Currently, a lava dome is growing in Redoubt's summit crater. Photography and thermal images showed that the dome, as of April 17, is about 500 m by 700 m (1640 ft by 1300 ft) in size and at least 50 m (160 ft) thick. The dome growth is accompanied by emissions of volcanic ash and gases.