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A rapid electrical sounding method: The «three-point» method: a Bayesian approach by Henri Robain; Muriel Lajarthe; Nicolas Florsch is a Earth and Planetary Sciences article available to read on EtoBox.

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Only three independent measurements of apparent resistivity are theoretically sufficient to retrieve the parameters of a geoelectrical model with two layers, i.e. the resistivities of the two layers and the thickness of the first one. The Three-Point Ž . Method TPM presented here is a rapid electrical sounding field procedure based on that principle. It consists of measuring the apparent resistivity using only three interelectrode spacings instead of some tens as for a usual vertical electrical sounding. To invert these data and check out the limits of this simplified field procedure, we use a Bayesian probabilistic formalism. Such an approach appears more effective than other traditional inversion methods because it allows to calculate exhaustively a probabilistic description of the equivalent solutions. Both synthetic and field data validate TPM when a model with two layers correctly describes the geoelectrical structure of the ground. Particularly, TPM combined with the Bayesian inversion method is a tool well-designed to rapidly characterise the overburden thickness in sedimentary contexts, or the water table depth in the case of sufficient resistivity contrast between saturate

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Author

Henri Robain; Muriel Lajarthe; Nicolas Florsch

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-9851)

Published

2001

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)