Digital 5' x5' Gravity Maps of the Săo Francisco Craton, the Marginal Fold/Thrust Belts and Contiguous Continental Margin/Oceanic Basins

Digital 5'x 5' Free-air, Bouguer and residual anomaly maps are presented based on over 45,000 gravity stations collected by different institutions and stored at IAG-USP gravity data bank. The area defined by 54-32°W and 8-24°S covers the Săo Francisco craton and its marginal fold/thrust belts, the conterminous eastern continental margin and oceanic basins. The gridded map was obtained using the least-squares collocation technique. The nominal resolution of the present maps is 5' in areas with good data coverage. In the oceanic region, conventional marine gravity data were processed with satellite altimetric data obtained by GEOSAT Exact Repeat Mission. The gridded anomaly maps, together with the stations istribution are made available in digital form. An improvement in data coverage is expected as new data are collected and contributed to the data-bank, so that continuous update of the present model will be possible. For obtaining these data and more information, connect http://www.iag.usp.br/geofisica/sfcraton.html.