File:EarthGravityPREM.svg

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English: Earth's Gravity according to the Preliminary Reference Earth Model (PREM). The acceleration has its maximum at 3480 km and a value of 10.68 m/s²

The other curves show:

  1. An approximated Earth, where the density decreases linearly from center to surface. In this model, the density at the center is the same as in the PREM, but the surface density is chosen in such a way that the mass of the resulting sphere equals the mass of the Earth.
  2. An idealized Earth with constant density (naturally, Earth's average density was used for this).
Français : Gravité terrestre selon le modèle terrestre de référence préliminaire ou Modèle PREM, en anglais Preliminary Reference Earth Model (PREM).

La gravité est nulle au centre du globe. Elle passe par un maximum de 10,68 m/s² au rayon 3480 km. Elle est de 9,81 m/s² en surface (rayon 6400 km). Elle décroit depuis la surface de la Terre en s'éloignant vers l'espace.

Une courbe équivalente est obtenue ici : https://www.wolframalpha.com/input?i=Gravity+inside+Earth

Les autres courbes du diagramme montrent, à titre de comparaison, des approches simplifiées :

  1. Un modèle où la densité diminuerait linéairement du centre à la surface. Dans ce modèle, la densité au centre est la même que dans le PREM, mais la densité en surface est choisie de manière à ce que la masse de la sphère résultante soit égale à la masse réelle de la Terre.
  2. Un modèle utilisant une densité moyenne constante.
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current13:44, 4 February 2023Thumbnail for version as of 13:44, 4 February 2023750 × 510 (16 KB)wikimediacommons>Jean TranxeneClarifié l'axe des abscisses : "Rayon en milliers de kilomètres"

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