A NEW STUDY BY VOLCANO EXPERTS AT ETH ZURICH The researchers determined the age of garnet crystals present in the volcanic deposits. The most explosive magma type at Vesuvius is stored in a reservoir in the upper crust for several thousand years before the influx of more primitive, and hotter, magma from the lower crust triggers an eruption. Is Vesuvius taking an extended siesta? | Phys.org
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