A càrrec de Dr. Roberto Scandone (Dipartimento di Fisica "E. Amaldi", Università degli Studi Roma Tre, Itàlia)
SEMINARIS DE LA FACULTAT DE GEOLOGIA I L'INSTITUT DE CIÈNCIES DE LA TERRA JAUME ALMERA

Universitat de Barcelona (UB)
Consell Superior d'Investigacions Científiques (CSIC)

Dia: Dimecres 3 de Juny
Hora: 12.00 h
Lloc: Sala d'actes de l'Institut Jaume Almera

Resum:
Forecasting the awakening of dormant volcanoes is of paramount importance for the reduction of volcanic risk. To better achieve this accomplishment, it is necessary to know in great detail both the volcanological history of a volcano and its episodic unrest that may help to unravel the hidden internal dynamics of magma ascent and storage. We present several examples drawn by the past activity and quiescence of several volcanoes (Mount St Helens, Vesuvius) to illustrate these concepts. In a regime of open path, the magma ascent results in episodic eruptions of small volume (in the order of a few million m3of magma). Partial obstruction of the ascent path may result in shallow level accumulation of magma and its possible eruption for periods lasting also years. We show that even during quiescent periods, the normal dynamics of a volcano is characterized by episodic arrivals of isolated magma batches from mantle or mid-crustal magma chambers into the shallow crust.