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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.
The 125km E rift zone has been the site of much activity in the last century as shall be detailed below. Annotated overview of Kilauea summit region. Halema'uma'u crater (1040m) in Kilaueas summit caldera. Site of lava lake until 1924.