A number of conflicting models have been proposed for the internal plumbing system of Etna; some of the conflict arises from attempts to fit the same model to the whole of Etna's history. We argue that at present magma reaches the surface without significant high-level storage during its ascent, and that eruptions are tectonically controlled. These conditions have probably prevailed for the past 200 yr. However, evidence from lavas erupted in prehistoric times suggests that substantial low-pressure differentiation accompanied by different styles of eruption took place, implying a different plumbing system which includes high-level storage of magma.
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Guest, J., Duncan, A. Internal plumbing of Mount Etna. Nature 290, 584–586 (1981). https://doi.org/10.1038/290584a0
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