Campi Flegrei caldera crustal dynamics inferred from tiltmetric data.
Falanga M., De Lauro E., Petrosino S.
IV - Geofisica e fisica dell'ambiente
Aula 32C-1 - Giovedì 20 h 09:00 - 13:00
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We analyse tiltmetric time series recorded at borehole instruments recently installed at Campi Flegrei caldera (Italy), a volcanic area subjected to the phenomenon of bradyseism. For the first time, we evaluate the crustal response in terms of ground tilting of the entire caldera to external excitations such as long/medium-period tidal constituents, by adopting a technique based on fourth-order statistics. Indeed, we recognize diurnal (solar) and long-period (fortnightly and monthly) components, superimposed to the normal deformation trend of the area. They show precise polarization directions and are associated with an oscillatory deformation pattern with the same periodicity of the corresponding tidal constituents. The comparison with the local geology evidences that the tidal tilting is controlled by the local stress field distribution and the rheology, thus inducing structural and thermoelastic site effects.