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Multiplication of the depth of detectability using γ11n 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 γ11n arrays. Journal of Applied Geophysics, 107. pp. 195-206. ISSN 0926-9851, ESSN: 1879-1859

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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 DDcalculations for conventional electrode arrays it is shownin this paper that there is a nearly linear relation between the maximumvalue 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 γ11n arrays are therefore expected to have larger DD values, too. The performed DD-calculations have confirmed this expectation. γ11n arrays are linear geoelectric arrays where γ 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 prismand dyke models the γ11n 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 γ11n arrays as it was verified also by numerical studies. These arrays require moreover less measurement than most conventional arrays resulting in shorter measuring time.

Item Type: Article
Uncontrolled Keywords: Keywords: Geoelectric array, Depth of investigation, Depth of detectability, ERT, γ11n arrays, Parameter sensitivity
Subjects: Q Science / természettudomány > QE Geology / földtudományok > QE01 Geophysics / geofizika
Depositing User: Dr Sándor Szalai
Date Deposited: 12 Sep 2014 07:23
Last Modified: 12 Sep 2014 07:23
URI: http://real.mtak.hu/id/eprint/14756

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