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Accession number;01A0565415
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| Title;Solid Earth Model with Liquid Core and Ocean Loading in Application to Ground Water Tides in Deep Wells. |
| Author;
SCHERNECK H-G
(Chalmers Univ., Technol., Onsala, Swe)
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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.204-212(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;English |
| Abstract;Thanks to a parametrised solid earth tide model that efficiently(with a minimum set of parameters) describes the transfer response of the earth to the input tide potential in harmonic decomposition it is possible to obtain high-sensitivity in determination of the frequency and quality factor of the liquid core nearly-diurnal free nutation from observation of ground water tides in deep wells. The response is enhanced because of the fortunate Love number combination that applies to volumetric strain and the way the resonance affects the h and l Love numbers. In crystalline rocks shear strain coupling can enhance or attenuate this relation further. A limiting factor is the presence of ocean loading tides. Even in cases far away from coasts the effect is significant; however, there it can be modelled with sufficient accuracy. An example is shown from ground water pressure measurements in a 700m deep borehole in south-east Sweden. Six months of data provide enough sensitivity to estimate the resonance frequency to be bracketed between 380 and 440 days. (author abst.) |
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