Definition
Earth Rotation, Excitation, Tidal. Temporal variations in the magnitude and orientation of the angular velocity vector of the solid Earth caused by tidal processes occurring in the mantle and crust, ocean, and atmosphere.
Introduction
Tidal forces arise when the gravitational pull of one body (A) on a second body (B) is appreciably greater on the nearer part of B than on its center. Equally, A’s pull on B’s center exceeds the gravitational attraction felt by the most distant part of B. For Earth, the tidal forces exerted by the Moon and Sun set the ocean into motion and cause periodic deformations of the solid crust and mantle. As these compartments of the planet are deformed, the associated changes in gravitational attraction modulate the initial tidal force. The resulting tides of the solid Earth have magnitudes of several tens of centimeters, whereas basin geometry and other effects (e.g., resonance) result in oceanic tides greater than 1 m in many places (Fig. 1). There...
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References and Reading
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Schindelegger, M. (2023). Earth Rotation, Excitation, Tidal. In: Sideris, M.G. (eds) Encyclopedia of Geodesy. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-02370-0_101-1
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DOI: https://doi.org/10.1007/978-3-319-02370-0_101-1
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