Abstract
The problem of the secular deceleration of the Earth has been intensively studied in astronomy and geophysics in the frame of the evolution of the Earth/Moon/Sun system. In general, these studies are devoted to the different processes like mantle anelasticity or oceanic dissipation that can account for the braking of the Earth rotation; an important effort has also been undertaken in the observations to obtain the most accurate determination of this braking rate. Our contribution will mainly concern the various geodynamic consequences due to the secular deceleration. First we will consider the response of the fluid core when the mantle slows down. Then we investigate the radial and zonal deformation and related geometric and dynamic effects caused by changes in the rotational potential. The possibilities of resonant amplification in the Earth and core wobbles caused by forcing mechanisms related to the orbital motion of the Earth around the Sun supposed to be stable over geologic times are pointed out. Finally, possible implications of the secular change in the spin rate on the magnetic scaling laws, and especially on the history of the Earth magnetic field, are given.
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Hinderer, J., Legros, H. (1990). Global Consequences of the Tidal Secular Deceleration for the Solid Earth and its Fluid Core. In: Brosche, P., Sündermann, J. (eds) Earth’s Rotation from Eons to Days. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75587-3_19
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DOI: https://doi.org/10.1007/978-3-642-75587-3_19
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