Multiplication of the depth of detectability using gamma 11n arrays

Szalai, Sándor and Lemperger, István and Metwaly, Mohamed and Kis, Árpád and Wesztergom, Viktor and Szokoli, Kitti and Novák, Attila (2014) Multiplication of the depth of detectability using gamma 11n arrays. JOURNAL OF APPLIED GEOPHYSICS, 107. pp. 195-206. ISSN 0926-9851

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Abstract

The depth from which one can get information has always been a crucial parameter in the geophysical exploration. This paper deals with the depth of detectability (DD) of 2D electric resistivity tomography configurations. DD is the maximal depth from which a given model body is detectable in the presence of a given noise level. Based on previous DD calculations for conventional electrode arrays it is shown in this paper that there is a nearly linear relation between the maximum value of their parameter-sensitivity (PS) maps and their DD values. Studying the PS maps of other arrays, as well, we found that many of them have higher PSmax values than those of the conventional arrays. These so-called arrays are therefore expected to have larger DD values, too. The performed DD-calculations have confirmed this expectation. gamma 11n In arrays are linear geoelectric arrays where refers to the CPCP order of the current (C) and potential (P) electrodes whilst the subscript numbers refer to the distance of the neighbouring electrodes. In case of the studied prism and dyke models the gamma 11n arrays - if n is larger or equal to 2 - consistently produced higher DD-values than the best conventional arrays. The DD value of these arrays can be even 2-3 times larger than that of the best conventional array value. Such an increase in the DD value is especially useful if the available place for measurements is limited, e.g. due to infrastructural conditions. Anomalies in large depth, for example, which are not seen by traditionally used arrays, may become detectable using gamma 11n arrays as it was verified also by numerical studies. These arrays require moreover less measurement than most conventional arrays resulting in shorter measuring time. (C) 2014 Elsevier B.V. All rights reserved.

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