
%0 Journal Article
%A Wilson, Glenn 
%A Raiche, Art 
%A Sugeng, Fred 
%T Practical 3D AEM inversion using 2.5D modelling
%J ASEG Extended Abstracts
%D 2006/03/01
%V 2006
%N 1
%P 1-4
%K 
%R https://doi.org/10.1071/ASEG2006AB196
%U https://www.publish.csiro.au/paper/ASEG2006AB196 
%X 2.5D electromagnetic (EM) modelling computes the response due to a 3D source from an arbitrary 2D geoelectrical model which has an infinite strike length. As such, airborne EM (AEM) data can 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 frequency and time-domain AEM surveys for which inversion run-times are in the order of hours. 
