Magnetic effects of disjunctive thin layers in 2D forward models and their equivalent magnetic sources

Analysis and solution of the forward magnetic problem for models of disjunctive layered geological structures, such as faults and layer discontinuities, are developed in this paper.  Magnetic anomaly components Z, H, T, ΔT and Ta resulting from disjunctive geologic structures are similar to those caused by thin-layer magnetic sources of finite size. Structures of a discontinuous horizontal layer, an up-thrown fault, inclined, normal or reverse faulted, an over-thrusted structure and also a thick-layer fault of the relatively small throw are examined. The composition of different forward magnetic models of disjunctive structures and their calculations can be facilitated by the applied specific properties of thin layers with unlimited depth extent. A method of rotation is proposed to analyse the anomalous magnetic effects caused by discontinuous crustal structures. The results shown are useful in analysing field magnetic data, recognising sources, inverting anomalies and interpreting geophysical data.