FIGURE 11.2: Earth's gravity anomaly from the GRACE mission yields smaller-scale structures. Standard gravity is defined as the value of gravity for a perfectly smooth "idealized" Earth, and the gravity anomaly (expressed in units of milliGals [mGal]) is a measure of how actual gravity deviates from this standard.

SOURCE: NASA/Deutsches Zentrum für Luft-und Raumfahrt (DLR).