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Re-lnterpretation on MT Data from Antinaco-Los Colorados Valley Through a Decomposition TechniqueNormal access

Authors: C. Pomposiello and A.M. Osella
Event name: 3rd International Congress of the Brazilian Geophysical Society
Session: Workshop: Electromagnetic Induction Studies
Publication date: 07 November 1993
Language: English
Info: Extended abstract, PDF ( 2.02Mb )

We performed a geophysical studv in the Antinaco-Los Colorados Valley in order to determinate the thickness of the sedimentary cover and the sequence of the more superficial layers. Nine magnetotelluric and four audiomagnetotelluric soundings were established along an east-west profile. The analysis of the results, using the traditional Swifts diagonal minimization method, indicates a deep basin and a very conductive layer is detected at around 400m, coincident with the depth of drillings, which may be associated to the presence of aquifers. In this paper we present a re-interpretetion of the magnetotelluric impedence tensor using the decomposition techniques developed by Bahr.

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