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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2001
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32773311 |
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Table of Contents:
- Apparent resistivity and spectral induced polarization in the submarine environment Edson E. S. Sampaio Hercules de Souza Multidisciplinaria (Ciencias Naturales y Exactas) sea water forward modeling induced polarization complex apparent resistivity Relatively few investigations have employed electrical methods in the submarine environment, which maybe promising for mineral deposits or threatened by environmental problems. We have measured the electricfield using both disk and bar electrodes in the sea water at three different levels: sea surface, seven metersdeep, and sea bottom at a depth of ten meters, employing a 2 m spacing dipole-dipole array with 7 arrayspacings of investigation, and 13 values of frequencies at steps of (2N hertz, N = 2, 1, 0, 1, 2,.....10).The measurement allowed the analysis of the electric field as a function of frequency and spacing, and ofthe spectral induced polarization. Modelling and interpretation of the apparent resistivity yielded a good fitwith previous drilling data. Analysis of the spectrum of the complex apparent resistivity and the comparisonwith equivalent circuits, provided information about the grain size, the mineral composition and the majorinduced polarization phenomenon occurring below the sea. Therefore the result of the present research showthe feasibility of measuring the variation of seawater resistivity in situ, as well as the resistivity of sea bottomsediments. 2001 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32773311 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.73