File:EarthGravityPREM.svg

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File:EarthGravityPREM.svg - Wikipedia

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Summary

Description

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:

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.
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 :

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.
Un modèle utilisant une densité moyenne constante.

Date 22 July 2013

Source

Dziewonski, A.M. (1981). "Preliminary reference Earth model". Physics of the Earth and Planetary Interiors 25: 297–356.
http://geophysics.ou.edu/solid_earth/prem.html
AllenMcC., File:EarthGravityPREM.jpg for the linear density curve

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	Date/Time	Dimensions	User	Comment
current	11:44, 4 February 2023	750 × 510 (16 KB)	Jean Tranxene	Clarifié l'axe des abscisses : "Rayon en milliers de kilomètres"
	17:06, 25 January 2023	750 × 510 (16 KB)	Jean Tranxene	french
	00:17, 6 September 2020	750 × 510 (15 KB)	Nicoguaro	Fix Spanish translation
	00:07, 6 September 2020	750 × 510 (14 KB)	Nicoguaro	Reverted to version as of 22:45, 21 June 2020 (UTC)
	00:07, 6 September 2020	750 × 510 (18 KB)	Nicoguaro	Reverted to version as of 22:05, 5 September 2020 (UTC)
	22:11, 5 September 2020	750 × 510 (19 KB)	Nicoguaro	File uploaded using svgtranslate tool (https://svgtranslate.toolforge.org/). Added translation for es.
	22:05, 5 September 2020	750 × 510 (18 KB)	Nicoguaro	File uploaded using svgtranslate tool (https://svgtranslate.toolforge.org/). Added translation for es.
	22:45, 21 June 2020	750 × 510 (14 KB)	Speravir	Fix: It's Catalan language
	22:38, 21 June 2020	750 × 510 (14 KB)	Speravir	made multilingual: merged Spanish version and added German translation
	23:51, 5 March 2014	750 × 510 (12 KB)	Rainald62	corrected diagram title (combined effects of gravity and centrifugal acceleration), corrected x-axis title, improved style (imho)

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Short title	Gravity Acceleration of Earth
Image title	This svg graphic is to edit with an text editor. Please do not overwrite this file by saving with an image editor. ---------------- Source of PREM: http://geophysics.ou.edu/solid_earth/prem.html Linear density: line with constant rise Source of constant density: copied from http://commons.wikimedia.org/wiki/File:EarthGravityPREM.jpg; the base source or calculation is not stated there Space: g1 * r1^2 = g0 * r0^2
Width	750
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inception

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