A gravity anomaly refers to the variation in the strength of the gravitational field at a specific location on Earth relative to the expected or average gravitational field strength at that location. Earth’s gravitational field is not uniform due to variations in the distribution of mass within the planet. Gravity anomalies are measured using instruments like gravimeters and are expressed in terms of milligals (mGal), with positive anomalies indicating stronger-than-average gravity and negative anomalies indicating weaker-than-average gravity.
Gravity anomalies can be caused by geological features such as variations in rock density, subsurface structures, and the presence of mineral deposits. These anomalies are valuable in geophysics and geology for mapping and understanding Earth’s subsurface composition and structure.
