Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5860
AuthorsRinaldi, A. P.* 
Todesco, M.* 
Bonafede, M.* 
TitleHydrothermal instability and ground displacement at the Campi Flegrei caldera
Issue Date2010
Series/Report no./178 (2010)
DOI10.1016/j.pepi.2009.09.005
URIhttp://hdl.handle.net/2122/5860
KeywordsHydrothermal system
ground deformation
poro-elasticity
volcanic unrest
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 
AbstractGround deformation is commonly observed at active volcanoes, where it represents a reliable sign of unrest and a potential precursor of eruptive activity. The source of deformation, however, is not always unequivocally constrained. Magma ascent and differentiation are generally involved, but hydrothermal fluids may play a role, due to thermal expansion and pore pressure acting on rocks. The identification of mechanisms driving ground displacement bears important consequences for hazard evaluation. The aim of this work is to evaluate mechanical effects associated with pressurization and heating of hydrothermal fluids. We first simulate the heat and fluid flow driven by the arrival of magmatic fluids from greater depth. Then, we calcu- late the rock deformation arising from simulated pressure and temperature changes within a shallow hydrothermal system. We employ a mathematical model, based on the linear theory of thermo-poro-elasticity and on a system of distributed equivalent forces. Results show that stronger degassing of a magmatic source may cause several centimeters of uplift.
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