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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4980

Authors: Currenti, G.*
Del Negro, C.*
Ganci, G.*
Title: Finite element modeling of ground deformation and gravity field at Mt. Etna
Issue Date: Feb-2008
Series/Report no.: 1/51 (2008)
URI: http://hdl.handle.net/2122/4980
Keywords: numerical modeling
gravity anomaly
Abstract: An elastic 3-D axi-symmetric model based on Finite Element Method (FEM) is proposed to compute ground deformation and gravity changes caused by overpressure sources in volcanic areas. The numerical computations are focused on the modeling of a complex description of Mt Etna in order to evaluate the effect of topography, medium heterogeneities and source geometries. Both ground deformation and gravity changes are investigated by solving a coupled numerical problem considering a simplified ground surface profile and a multi-layered crustal structure inferred from seismic tomography. The role of the source geometry is also explored taking into account spherical and ellipsoidal volumetric sources. The comparison between numerical results and those predicted by analytical solutions disclosed significant discrepancies. These differences constrain the applicability of simple spherical source and homogeneous half-space hypotheses, which are usually implicitly assumed when analytical solutions are applied.
Appears in Collections:05.05.99. General or miscellaneous
Annals of Geophysics

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