The Bouguer anomaly is defined as the difference between the gravity measured at a specific point on the Earth’s surface and a gravity value calculated at the same point assuming that the Earth’s crust is homogeneous. This map shows both the regional negative anomalies associated with the Alps and the positive anomaly of the Sesia–Finero zone that signifies an excess of mass at depth.

This database (SDE) contains data from a gravity survey of the entire Czech Republic at the scale of 1:200,000 from the period 1957-1960 (100% of the territory – ca 23 thousand gravity points). Since 1960, the systematic gravity survey at the scale of 1:25,000 has started and covers nearly 70 % of the Czech Republic area. At the end of 2018 the database contains 3,992 gravity points from the old mapping at the scale 1:200,000 and 304,199 points from the detailed mapping 1:25,000; this new data replaces the old one.