
%0 Journal Article
%A n, G.A.Wilso 
%A Raiche, A.P. 
%A Sugeng, F. 
%T 2.5D inversion of airborne electromagnetic data
%J Exploration Geophysics
%D 2006/12/01
%V 37
%N 4
%P 363-371
%K 
%R https://doi.org/10.1071/EG06363
%U https://www.publish.csiro.au/paper/EG06363 
%X 2.5D electromagnetic (EM) modelling computes the response of a 3D source from an arbitrary 2D geoelectrical model. As such, it is practical for airborne EM (AEM) data to be inverted using 2.5D modelling provided that the geoelectrical cross-section is relatively constant along a strike length that exceeds the AEM system footprint. The program ArjunAir is introduced for modelling and inversion based on a 2D finite-element method that enables the accurate simulation of 3D source excitation for full domain models inclusive of topography, non-conforming boundaries, and very high resistivity contrasts. Inversion is based on an iterative Gauss-Newton method that is solved using the damped eigenparameter algorithm. Examples are presented for synthetic and practical frequency and time-domain AEM surveys for which inversion run-times are on the order of hours. 
