Using Transformed TMI Data to Invert for Remanently Magnetised Bodies

Regional-scale aeromagnetic survey of the south-west of Algeria: A tool for area selection for diamond exploration

“…magnetization directions) of an anomaly (Roest et al, 1992). Therefore calculating expression (3) for TMI data, which contain both induced and remnant components lead to transform both components into a single coherent response (Paine et al, 2001).…”

3D Inversion of magnetic total gradient data in the presence of remanent magnetization

“…The first is the total gradient of the vertically integrated magnetic anomaly (termed ASVI by Paine et al) and the second is the vertical integral of the total gradient (VIAS). Because of the weak dependence and the fact both quantities have the dimension of magnetic field, nT, Paine et al (2001) treated the quantities as RTP fields and applied the 3D inversion algorithm by Li and Oldenburg (1996). Compared to inverting total field anomaly by assuming induced magnetization only, this approach has produced somewhat better results.…”

“…This paper improves upon the work by Paine et al (2001) by developing an algorithm that directly inverts quantities having a minimal dependence on the direction of the magnetization. Such quantities include the magnitude of the anomalous magnetic field vector and the magnitude of the gradient vector of a magnetic anomaly.…”

“…In an effort to invert for 3D magnetic source distribution in the presence of remanence, Paine et al (2001) examined two related quantities. The first is the total gradient of the vertically integrated magnetic anomaly (termed ASVI by Paine et al) and the second is the vertical integral of the total gradient (VIAS).…”

3D magnetic inversion in highly magnetic environments using an octree mesh discretization

“…In these circumstances the assumption of small susceptibilities is no longer valid ignoring them in the inversion can lead to poor inversion results Considerable literature has been devoted to remenant magnetization and the estimation of its direction (e.g. Paine et al 2001;Phillips, 2003;Li et al 2004;Dannemiller and Li, 2006) but much less attention has been paid to selfdemagnetization. One approach, developed by Shearer (2006), has its roots in the the remenant magnetization problem.…”