Second Projet de Renforcement Institutionnel du Secteur Minier de la Republique Islamique de Mauritanie (prism-ii)
– Upward continuation and subtraction from RTP Data
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2.2.3 – Upward continuation and subtraction from RTP DataUpward continuation transforms the magnetic field (here the reduced to the pole field) measured at one surface (in this case, 100m above the ground) to the field that would be measured on another surface farther from the sources (here, 200m above the ground). This transformation attenuates anomalies with respect to wavelength, the shorter the wavelength, the greater the attenuation (Blakely 1995). A common technique to sharpen the effects of near-surface sources is to upward continue the magnetic data a small interval to generate a regional field and then subtract this regional field from the unfiltered data set (the observed reduced to the pole map) to derive a residual or high-frequency-passed magnetic field associated with shallow sources. The resulting filtered map (Fig. 8) of the new data is essentially a structure map (Plate 2)—highlighting fracture patterns within granites, dikes, BIF’s, tectonic “fabric” within the Mauritanides, edges of sills, etc. 
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