Abstract
The article is dealing with the problem of cavity effect influence on the tidal measurements in geophysics. The measurements of tide-induced deformations and tilts are usually performed in underground cavities. The data obtained must be debugged of the influence of the cavity itself (cavity effect) and of the effect of elastic parameter inhomegeneities in the vicinity of the measurement point (geological effect). Since these effects are reflected as a modulation of tidal waves (in both amplitude and phase), the most natural way to perform this can be modelling of the strain and stress field around the cavity as precisely as possible. Separation of the above mentioned effects from measurements by the time series analysis is principally not possible. In our contribution the emphasis was given on the use of the high-order finite element approximation for the deformation field modelling in the immediate vicinity of the cavity. Graphical presentation shows the disturbances in deformation and stress field (induced by tides) in the immediate vicinity of cavity simulating the real situation of the tidal station Vyhne of the Geophysical Institute of the Slovak Academy of Sciences.
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