A basic parameter of all
geophysical methods, including geoelectrics, is the depth of investigation
(DI). A critical parameter in geophysical exploration has always been the depth
from which knowledge can be accessed. This paper deals with the detectability
depth (DD) of configurations of 2D electric resistivity tomography. In the
presence of a given noise level, DD is the maximum depth from which a given
model body is observable. This paper shows that there is a nearly linear
relationship between the maximum value of their parameter-sensitivity (PS) maps
and their DD values, based on previous DD measurements for traditional
electrode arrays. We found that many of them have higher PSmax values than
those of traditional arrays when analysing the PS maps of other arrays, as
well. Therefore, these so-called γ arrays are supposed to also have larger DD
values. This expectation has been verified by the executed DD calculations.
Linear geoelectric arrays, where γ refers to the CPCP, are γ arrays Arrays have
consistently generated higher DD values than the best traditional arrays if n
is greater or equal to 2. The DD value of these arrays can be 2-3 times greater
than the best value of the conventional array. Such an improvement in the DD
value is particularly useful when the measurement space available is reduced,
e.g. due to infrastructural conditions. Large-depth anomalies, for example,
that are not seen by traditionally used arrays, can be detectable using
γ-arrays, as numerical studies have also verified. In addition, these arrays
require less measurement than most conventional arrays, which results in
shorter measurement time. According to the above observations, the γ ⁇ arrays and particularly the γ ⁇ -, γ ⁇ - and γ ⁇ arrays
can be a useful alternative to traditional arrays, especially in sites where
the place available for measurements is limited (e.g. built-up areas), because
they can provide information from greater depths. Measurements are mor with
these arrays more Consuming less time
Author (s) Details
Sándor Szalai
CSFK GGI,
H-9401 Sopron POB 5, Hungary and Department of Geophysics, University of
Miskolc, H-3515 Miskolc-Egyetemváros, Hungary.
Dr. Mátyás Krisztián Baracza
Research Institute of Applied Earth Sciences, University of Miskolc,
H-3515 Miskolc-Egyetemváros, Hungary.
István Lemperger
CSFK GGI, H-9401 Sopron
POB 5, Hungary.
Mohamed Metwaly
Archaeology Department, College of Tourism and Archaeology, King Saud
University, Saudi Arabia and National Research Institute of Astronomy and
Geophysics (NRIAG), Cairo, Egypt.
Árpád Kis
CSFK GGI,
H-9401 Sopron POB 5, Hungary.
Attila Novák
CSFK GGI, H-9401 Sopron POB 5, Hungary.
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