The inversion of time-domain airborne electromagnetic data using the plate model. Ph.D. thesis

One of the most successful airborne electromagnetic methods is the time domain airborne INPUT¹ system, for numerous mineral deposits were found by this system in the Canadian Shield. Present interpretation techniques are based on the use of nomograms and the method is easily amenable to digital processing as its is easy to program and economic to use. In this thesis it is shown how to use inverse theory to interpret time domain E.M. data with the rectangular thin plate model by introducing some economies. It is then possible to estimate parameter errors, the correlation matrix and to assess the validity of the model. This is extended to the joint inversion of magnetic and aeromagnetic data, a case that often arises in mining problems. It is finally shown that under some assumptions the late time channels can be used to interpret time domain E.M. data in the presence of conductive overburden. -from Author