Spectral Analysis Of Voltage Measurements For The Interpretation Of Dipole Geoelectrical Soundings In Low Resistivity Geothermal Areas

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Journal Article: Spectral Analysis Of Voltage Measurements For The Interpretation Of Dipole Geoelectrical Soundings In Low Resistivity Geothermal Areas

Abstract
This paper deals with the application of the Maximum Likelihood Method (MLM) for power spectral analysis of voltage recordings at the receiving dipole, obtained during the execution of dipole vertical soundings in the geothermal area of Travale (Tuscany). After a brief recall of the dipole sounding method with particular emphasis given to a simple and quick field technique, we consider the problem encountered in the evaluation of the useful signal in presence of low resistivity formations and low signal-to-noise ratios. We then give a detailed description of the MLM, which permits the individuation of the useful signal at the frequency of the energizing current, by suppressing contemporarily the random stationary telluric noise without any signal distortion. Finally, we show and discuss some field recordings as proof of the validity of the field technique employed and of the spectral analysis method for apparent resistivity data acquisition.

Authors 
M. Loddo and D. Patella








Published Journal 
Geothermics, 1977





DOI 
Not Provided
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Citation

M. Loddo,D. Patella. 1977. Spectral Analysis Of Voltage Measurements For The Interpretation Of Dipole Geoelectrical Soundings In Low Resistivity Geothermal Areas. Geothermics. (!) .