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Flattening of the Earth; further from hydrostaticity than previously estimated

Flattening of the Earth; further from hydrostaticity than previously estimated

Geophysical Journal International 183.2

The knowledge of the gravitational potential coefficients J2 and J4 of a hydrostatic Earth model is necessary to deal with non-hydrostatic properties of our planet. They are indeed fundamental parameters when modelling the 3-D density structure or the rotational behaviour of our planet. The most widely used values computed by Nakiboglu need to be updated for two reasons. First, we have noted a mistake in one of his formulae. Secondly, the value of the inertia ratio I/MR2 chosen at the time of PREM is not any more the best estimate. Both corrections slightly but significantly reduce the hydrostatic J2 value: the dynamical flattening of the Earth is even further from hydrostaticity than previously thought. The difference between the polar and equatorial radii appears to be 113+ or -1 m (instead of 98 m) larger than the hydrostatic value. Moreover, uncertainties upon the hydrostatic parameters are estimated. Abstract Copyright (2010), RAS.

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Accession: 037054944

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DOI: 10.1111/j.1365-246x.2010.04771.x

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