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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.
But not all volcano craters are found at the top of the volcano. They can also appear on the flanks of large volcanoes, when side vents reach the surface and erupt. These are known as flank craters, while the crater on top is called a summit crater. volcano crater is a circular depression around a volcanic vent. This is where the lava, ash and rock erupt out of a volcano. In most situations, the volcano crater is located at the top of the volcano. Volcano Crater.