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. This paper studies the electromagnetic field from a horizontal electrical dipole inside a layered earth model with TIV anisotropy, including a visualization of the geometric patterns of the field through the medium. The objective here is to present a detailed formulation of the problem, as an aid to those who have an interest in modeling data from the Marine Controlled-Source ElectroMagnetic method – mCSEM, but find it hard to follow the usually abridged, often incomplete, descriptions found in the technical literature. We present a detailed vector potential formulation, with a semi-analytical solution, that allows the calculation of the fields with the source located in a finite thickness ocean layer over N-layered earth models. As an application, we use the implemented solution to study the geometrical distribution of the electric field generated by the dipole source in anisotropic layered media. Keywords: mCSEM, TIV electrical anisotropy, 1D electromagnetic modeling. RESUMO. Este artigo estuda o campo eletromagnetico de um dipolo eletrico horizontal no interior de um modelo estratificado com anisotropia TIV, incluindo uma visualizacao da geometria das linhas de campo atraves do meio. O objetivo e apresentar a formulacao detalhada do problema, para aqueles que tem interesse na modelagem de dados do metodo eletromagnetico de fonte controlada marinho – mCSEM, mas encontram dificuldades em seguir as descricoes geralmente muito resumidas, diversas vezes incompletas, na literatura tecnica. Apresentamos uma formulacao detalhada em termos do potencial vetorial, com uma solucao semi-analitica que permite o calculo dos campos com a fonte localizada em um oceano de espessura finita sobre uma terra estratificada com Ncamadas. Como aplicacoes, usamos a solucao implementada para estudar a distribuicao geometrica do campo eletrico gerado pelo dipolo fonte em meios estratificados anisotropicos. Palavras-chave: mCSEM, anisotropia eletrica TIV, modelagem eletromagnetica 1D.

A STUDY OF THE ELECTROMAGNETIC FIELD FROM THE MCSEM DIPOLE SOURCE IN AN ANISOTROPIC LAYERED EARTH