The transformation of airborne electromagnetic (AEM) data into apparent resisitivity and depth is traditionally made separately for each measurement point and does not take into account the neighbouring data or model values or multiple frequencies. Laterally constrained inversion, where the model roughness is minimized together with the data error using a 1-D layered earth model, provides an easy and fast method to transform multi-frequency AEM data into a physically more meaningful form. The method is based on linearised inversion, singular value decomposition and adaptive damping together with Occam type constraining for model roughness. The new inversion method is implemented in the AEMINV program program, the graphical user interface of which is based on the DISLIN graphics library. Thus, it can be compiled and run on a variety of computer platforms without major modifications. The inversion method was found stable and computationally efficient. Because the model is one-dimensional, the results show apparent resistivity and depth although the inversion yields 2-D resistivity pseudo-sections. The AEM inversion using a two-layer model, however, gives a possibility to map separately the overburden conductance and basement resisitivity.


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