Please use this identifier to cite or link to this item:
AuthorsTrasatti, E.* 
Bonafede, M.* 
TitleGravity changes due to overpressure sources in 3D heterogeneous media: application to Campi Flegrei caldera, Italy
Issue Date2007
KeywordsCampi Flegrei
finite element method
heterogeneous medium
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods 
AbstractEmploying 3D finite element method, we develop an algorithm to calculate gravity changes due to pressurized sources of any shape in elastic and inelastic heterogeneous media. We consider different source models, such as sphere, spheroid and sill, dilating in elastic media (homogeneous and heterogeneous) and in elasto-plastic media. The models are oriented to reproduce the gravity changes and the surface deformation observed at Campi Flegrei caldera (Italy), during the 1982-84 unrest episode. The source shape and the characteristics of the medium have great influence in the calculated gravity changes, leading to very different values for the source densities. Indeed, the gravity residual strongly depends upon the shape of the source. Non negligible contributions also come from density and rigidity heterogeneities within the medium. Furthermore, if the caldera is elasto-plastic, the resulting gravity changes exhibit a pattern similar to that provided by a low effective rigidity. Even if the variation of the source volumes is quite similar for most of the models considered, the density inferred for the source ranges from ∼ 400 kg/m3 (supercritical water) to ∼ 3300 kg/m3 (higher than trachytic basalts), with drastically different implications for risk assessment.
Appears in Collections:Manuscripts
Annals of Geophysics

Files in This Item:
File Description SizeFormat 
cf_revised.pdfmain article582.25 kBAdobe PDFView/Open
Show full item record

Page view(s)

Last Week
Last month
checked on Jul 25, 2017


checked on Jul 25, 2017

Google ScholarTM