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Holistic inversion of frequency-domain airborne electromagnetic data with minimal prior information  

Brodie, Ross (Australian National University & Geoscience Australia, Research School of Earth Sciences)
Sambridge, Malcolm (Australian National University, Research School of Earth Sciences)
Publication Information
Geophysics and Geophysical Exploration / v.12, no.1, 2009 , pp. 8-16 More about this Journal
Abstract
The holistic inversion approach for frequency domain airborne electromagnetic data has previously been employed to simultaneously calibrate, process and invert raw frequency-domain data where prior information was available. Analternative formulation has been developed, which is suitable in the case where explicit prior information is not available. It incorporates: a multi-layer vertically-smooth conductivity model; a simplified bias parameterisation; horizontal smoothing with respect to elevation; and cluster computer parallelisation. Without using any prior data, an inversion of 8.0 million data for 3.4 million parameters yields results that are consistent with independently derived calibration parameters, downhole logs and groundwater elevation data. We conclude that the success of the holistic inversion method is not dependent on a sophisticated conceptual model or the direct inclusion of survey-area specific prior information. In addition, acquisition costs could potentially be reduced by employing the holistic approach which largely eliminates the need for high altitude zero-level measurements.
Keywords
airborne; calibration; electromagnetic; holistic; inversion; MPI; parallelisation;
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