Geodynamical and geodetic consistency tests of earth density models

Physics

Scientific paper

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Density (Mass/Volume), Earth Planetary Structure, Geodynamics, Geopotential, Models

Scientific paper

Theory of a stratified heterogeneous spheroid is applied to compute the gravity and potential parameters of selected earth density models, and compare them with the corresponding quantities of a modern geodetic reference system based on observational data. These tests show considerable intermodel and model-reference discrepancies, the latter being attributable largely to the deviation of the earth from hydrostatic equilibrium. The discrepancies point out the desirability of standardizing the density models by adopting a uniform data set for earth's mass, its mean radius, and its mean moment of inertia or equivalently, its mean moment of inertia coefficient. Equally important, they indicate the need for further refinement of the earth density models. It should be recognized, however, that the refinement may not lead to a perfect reference earth model which satisfies the multiple, and sometimes mutually irreconcilable, demands imposed by the competing requirements of various disciplines, but perhaps to an optimum model which will serve as the most common denominator in a multidisciplinary context.

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