Следует заметить, что картинка сделана таким образом, чтобы наиболее контрастно показать аномалии гравитационного поля. [/QUOTE]
Да, действительно так.
http://commons.wikimedia.org/wiki/File:Gravitational_inhomogenity_of_Earth.jpg?uselang=ru
"The coloured surface depicts the level of varying altitudes where the gravitational pull is exactly the same. The geometric proportion is extremely exaggregated for better perceptibility. The purple, highest areas show some higher gravity of greater mass concentrations under the ground, the anomality value is cca. +60 mGal (0.0061%). If you make a high accuracy weight measurement here at a distance from the geometric center of Earth then you receive higher value than at the cyan area, at the same geometric altitude. Cyan indicates deviation nearly –70 mGal."
Для справки, что такое mGal:
"The gal, sometimes called galileo, (symbol Gal) is a unit of acceleration used extensively in the science of gravimetry. The gal is defined as 1 centimeter per second squared (1 cm/s2). The milligal (mGal) and microgal (µGal) refer respectively to one thousandth and one millionth of a gal."
[IMG]http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/GRACE_globe_animation.gif/250px-GRACE_globe_animation.gif[/IMG]
http://en.wikipedia.org/wiki/Gravity_Recovery_and_Climate_Experiment?uselang=ru