Tidal Gravity Results from GGP Network in Connection with Tidal Loading and Earth Response.
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Accession number;01A0565431
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| Title;Tidal Gravity Results from GGP Network in Connection with Tidal Loading and Earth Response. |
| Author;
DUCARME B
(Observatoire Royal De Belgique, Brussels, Bel)
SUN H-P
(Inst. Geodesy And Geophysics, Chinese Acad., Wuhan, Chn)
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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.308-315(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;The globally distributed gravity observations of the Global Geodynamics Project(GGP) network of superconducting gravimeters allow us to determine the characteristics of the small tidal waves, especially those with a frequency close to the core resonance. Before drawing any conclusion from the data it is compulsory to correct the oceanic tidal loading effects. As most of the cotidal maps exist only for the main waves, it was necessary to interpolate the dynamic response of the oceans for the additional groups, taking into account the effects of the core resonance on the oceanic response to the tidal force. We successfully used the Wahr and Sasao(1981) model of this resonance, and as a first test used the Schwiderski(1980) standard model for oceanic tides. The corrected amplitude factors and phase differences were compared with the Dehant, Defraigne and Wahr models for the response of the Earth to the tidal forces. We paid a special attention to the core resonance, trying to check if the phase lag of K1 and .PSI.1 is systematically positive while it is negative for .PHI.1, as suggested in the latest model of Mathews(this issue) which includes new features such as electromagnetic interactions at the core-mantle boundary. (author abst.) |
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