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Tidal strain observations carried out in the Sopronbánfalva Geodynamic Observatory (SGO) in Hungary are used to test thirteen different ocean tide loading models for diurnal and semi-diurnal tidal harmonic constituents O1, K1 and M2. Strain data with one minute sampling rate were corrected for temperature and barometric pressure and decimated to one hour sampling rate. Strain data, corrected in this way, were subjected to correction for ocean load. In the case of the diurnal tidal constituents O1 and K1 the measured amplitude factors of nearly 0.5 became close to the theoretical as a result of the correction, while in the case of the M2 semi diurnal wave the measured amplitude factor of almost 1 hardly changed due to correction. It was only found a negligible difference between the individual global ocean tide loading models mainly due to using different Earth models and Green functions. The effect of the diurnal (O1 and K1) and the semidiurnal (M2) ocean tide loading components is in the same order of magnitude at the SGO. The large residual vectors after the correction suggest that local effects need further investigation.

Comparison of Ocean Tide Loading Models Using Strain Data Measured in the Sopronbánfalva Geodynamic Observatory, Hungary