Vertical ocean loading amplitudes from VLBI measurements

Details Vertical ocean loading amplitudes from VLBI measurements Vertical ocean loading amplitudes from VLBI measurements

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..357s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 5, p. 357-360

Physics

12

Amplitudes, Geodesy, Loads (Forces), Ocean Models, Tides, Very Long Base Interferometry, Cartesian Coordinates, Diurnal Variations, Earth Crust, Viscoelasticity

Scientific paper

Vertical ocean loading amplitudes are determined by analysis of IRIS geodetic Very Long Baseline Interferometry (VLBI) data. The 4 nearly diurnal (K(sub 1), P(sub 1), O(sub 1), Q(sub 1)) and 4 nearly semidiurnal (K(sub 2), S(sub 2), M(sub 2), and N(sub 2)) component amplitudes can be inferred from the data with accuracies of 1-2 mm. Uncertainties of total displacements can approach 1 cm. Empirically determined total displacements are considerably larger than the values calculated from two geophysical models. The Scherneck model is found to give a better representation of VLBI delay data than the model of Pagiatakis by about 3 mm in residuals at 6 sites. Empirical estimation of the ocean loading amplitudes reduces Chi squared by 3067 for the 96 additional degrees of freedom in a fit to 273,000 IRIS VLBI observations, and reduces the RMS residuals by 3 mm relative to a fit using the fixed Scherneck model. Vertical ocean loading amplitudes can thus be inferred from VLBI data at a level which improves the overall model, but detailed assessment of individual tidal components is presently obscured by incomplete modeling at the tidal frequencies.

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