The grounded electrical-source airborne transient electromagnetic (GREATEM) method has been successfully applied to the geological mapping and environmental exploration in China and other Asian countries. However, the survey data is mainly interpreted with a flat earth model even in areas with rugged topography. The topographic effects can be serious in EM responses especially for early time channels. Neglecting the topographic effect can result in incorrect results in the interpretations of GREATEM data. In this paper, we model 3D time-domain EM responses for GREATEM system with unstructured edged finite-element method in combination with the backward Euler scheme. The tetrahedral grids are used to handle the complex geometry. We verify the effectiveness of our algorithm by analyzing numerical experiments for different topographic models.


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