Gravity gradiometry
MEASUREMENT OF VARIATIONS IN EARTH'S GRAVITATIONAL FIELD
Gravity gradient; Gravitational gradient; Gravity Gradiometry; Gravity gradiometer; Gravity gradient tensor
Gravity gradiometry is the study and measurement of variations (anomalies) in the Earth's gravity field. The gravity gradient tensor is the spatial rate of change of gravitational acceleration; as acceleration is a vector quantity, with magnitude and three-dimensional direction, the full gravity gradient is a 3x3 tensor.