Tidal Observations Derived from GPS Based Length of Day and Polar Motion Data.
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Accession number;01A0565413
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| Title;Tidal Observations Derived from GPS Based Length of Day and Polar Motion Data. |
| Author;
VARGA P
(Geodetic And Geophysical Res. Inst., Hungarian Acad. Sci, Sopron, Hun)
ZAVOTI J
(Geodetic And Geophysical Res. Inst., Hungarian Acad. Sci, Sopron, Hun)
GROTEN E
(Darmstadt Univ. Technol., Darmstadt, Deu)
ARFA-KABOODVAND K
(Darmstadt Univ. Technol., Darmstadt, Deu)
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Journal Title;Journal of the Geodetic Society of Japan
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Journal Code:G0199A
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ISSN:0038-0830
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VOL.47;NO.1;PAGE.193-197(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;More than two vears of continuous GPS observations in 1995-1997 completed by the International GPS service are analysed in terms of polar motion(PM) and length of day(LOD) in view of daily/subdaily variations. The aim of the research carried out was a complex study of these two phenomena which allows us to conclude that 1) the most prominent components of the record in the daily/subdaily frequency band were found at the tidal frequencies. The long periodic zonal tides were not detected in case of PM. The tesseral(diurnal) frequency anomalies are of Earth tidal origin(their amplitudes are around 1 mas). The semi-diurnal sectorial waves are around 0.1-1 mas and they are generated by oceanic tides. In case of LOD the most significant spectral amplitudes were found in case of zonal fortnightly Mf wave and in the semi-diurnal band for Mf wave. The order of the observed amplitudes is 10-3 s, 2) regular high frequency anomalies were observed in the frequency band 3-11 cycles/day. These effects can influence amplitude values at diurnal and semi-diurnal frequency bands, too. These anomalies are caused by the atmospheric tides, 3) the LOD time series of 1995-1997 was carefully compared with the seismological data catalogue of the US Geogical Survey and there was no short periodic daily/subdaily signal found which could be connected to earthquake activity. (author abst.) |
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