The FEM in the Interpretation of Tilt/Strainmeter Observations in a Cave: Air Pressure Loading Effects.

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  • FEM in the Interpretation of Tilt Strainmeter Observations in a Cave Air Pressure Loading Effects

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Topography and cavities determine inhomogeneities of the uppermost crust deformational field. The present 3D Finite Element model of the Villanova tilt/strain station in the Friuli (NE Italy) seismic zone has been used for the interpretation of the observations in an area where several meteorological and hydrological effects interfere with the tectonic stress field, main target of the tilt-strain observations themselves. Special attention was devoted to the boundary stress (or strain) conditions acting at the border of the model. In many cases, as the Villanova one, the tectonic stress field orientation is not well defined. In that seismic area indeed two main tectonic structures (Alpine and Dinaric) collide and overlap each other. The dependence of the output from the position of the instruments inside the cave was also examined. The results are compared with the observed values of the air pressure variation. The results show that cavity and topography produce a consistent rotation as well as strain concentrations up to three times larger than those of the corresponding homogeneous isotropic medium.

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