The hidden activity of volcanoes: Magma degassing events.

Chiodini G.

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IV - Geofisica e fisica dell'ambiente
GSSI Ex ISEF - Aula D - Mercoledì 25 h 16:30 - 19:00
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The fumarolic ratio among gas species of main magmatic origin (i.e. $CO_2$, He) with $CH_4$, that is formed in the hydrothermal environment, results as a powerful indicator of the arrival at the surface of the deep magmatic component. The analysis of time series of fumarolic composition at various volcanoes (e.g. Campi Flegrei, Vesuvius, Vulcano, Panarea, Nisyros, Mammoth Mt) suggests that frequent events of magma degassing occur at dormant volcanoes. The sudden arrival of the deep magmatic fluids causes pressurization and heating of the hydrothermal systems and, in turn, earthquakes and ground deformations complicating the interpretation of volcanic unrests.

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