Gravimetric Map of Switzerland 1:500,000

The new 2008 edition of the Gravimetric Map of Switzerland 1:500,000 with the Bouguer Anomalies is based on the International Gravity Formula of 1967, taking into account the topographic effects to a depth of 67 km (Hayford Zone O2) and using a constant density of 2670 kg/m³. The calculation of the numeric grid was achieved by interpolation and based on the stations of the Gravimetric Atlas of Switzerland 1:100 000.

The Bouguer gravity 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 in a homogeneous Earth crust model, which considers various parameters such as altitude, latitude and the influence of topography. This residual anomaly permits a geological interpretation through the determination of the dimensions and the density contrasts of deep rock bodies. Representing these anomaly variations by contour lines clearly shows on the one hand the regional negative anomalies associated with the Alps and on the other hand the positive anomaly of the Sesia–Finero zone, which signifies an excess of mass at depth.

This product is part of the GeoMaps 500 series. It is available as a printed map (folded or plano) or pixelmap. Further thematic maps are in preparation. For more information on the availability and the format of this product please visit our Geological Data Viewer  or the Geological Map Index these applications exist only in German and French).

To zoom in, please click on the map sheet index.