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Yavor CHAPANOV, Mila ATANASOVA, Bulgaria
SUMMARY
The modern geodetic observations, based on high-accuracy space techniques, provide decadal
time series of station coordinates. These time series are suitable to detect and research small
ground motion due to local and global geodynamical sources. Some space technique stations
are collocated and the comparison of their data may reveal common periodical oscillations
and impulse variations due to global changes of gravity, earthquakes, climate and
environment. Any different behavior of the time series of collocated stations should be
interpreted as a restricted local ground motion, or as a systematic data error. The periodical
and impulse variations of the coordinates of collocated VLBI and GPS stations at the
observatory Wettzell are compared and analyzed. The data jumps are determined by means of
a new useful high-sensitive method of impulse detection, which is able to estimate very small
changes of mean data values and velocities. The periodical oscillations of the station
coordinates are determined by means of partial Fourier approximation. The amplitudes and
phases of common seasonal, interannual and 11-year variations of Wettzell VLBI and GPS
stations are compared. This research may prove the reliability of modern geodetic time series
and the possibility to use them in the field of various geodynamical investigations.
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