A Bouguer Anomaly Map of southern Great Britain and the Irish Sea

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Abstract
A B ouguer anomaly map of the southern part of Great Britain and its filtered derivative are presented. Many negative Bouguer anomalies correlate with known sedimentary basins and granitic intrusions, but the granodiorites of the East Midlands are not associated with negative Bouguer anomalies. The data used in the compilation were obtained from the following: Bott et al. (1958 & 1971 ) for the SW England, north Irish Sea; Blundell et al. 1971 for the south Irish Sea; Griffiths and Gibb (1965) for Wales; Institute of Geological Sciences for Northern Ireland, England; Dublin Institute for Advanced Studies for the Irish Republic; Cambridge University for the English Channel and E. E. Cook (1965) for the North Sea. Each of the gravity maps obtained from the above sources was digitized by drawing square meshes. Except for a map of a small area of the North Sea, which was digitized at 16 km intervals, the gravity maps were digitized at 8 km intervals, values being interpolated by eye at sampling points. The digitized data were then used to compile a Bouguer anomaly map with a contour interval of 5 mgal. Although the various source maps used were of differing quality, surveying errors have no significant effect on the compiled map at the scale and contour interval presented. The compiled Bouguer map (Fig. 1) contains anomalies from 16 km in wavelength. The negative anomalies are outstanding, and they correlate well with the large sedimentary basins, such as the Irish Sea basin, North Sea basin, etc. Kent

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