All of the airborne geophysical work – data acquisition, processing and interpretation, was carried out by Fugro Airborne Surveys. Phase 1 was financed entirely by the Government of Nigeria. The survey was initiated by Professor Siyan Malomo, Director General of the NGSA, and it was conducted in two phases. Bottom right: First vertical derivative of the total magnetic field. Bottom left: SRTM digital elevation model. Top left: Ternary image of radiometric data (RGB = K-Th-U) Top right : Reduced-to-equator magnetic field. Geophysical responses over the central Benue Trough (250 km x 230 km).
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