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Peculiarities of Using 2D Electrical Resistivity Tomography in Caves

https://doi.org/10.17746/1563-0110.2020.48.4.067-074

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Abstract

The efficiency of archaeological studies inside caves could be greatly enhanced by geophysical methods because of their potential for examining deposit structure and features. Application of those methods in caves entails a number of problems caused by limited space for measurements and the complexity of the surrounding medium s structure as compared to above-ground measurements. In 2017, Selungur Cave in the Fergana Valley, Kyrgyzstan, was examined using electrical resistivity tomography. Because of the above concerns, in the course of the work the question of the reliability of the results arose. To clarify the issue, a numerical experiment was performed to assess the effect of the three-dimensional cave geometry on the results of a two-dimensional inversion. It was found that variations of cave geometry parameters result in unexpected false anomalies, and considerable errors in bedrock location and resistivity can occur. In the case of downward diverging cave walls, an accurate resistivity section can be obtained by using the inversion based on a two-dimensional model. Therefore, electrical resistivity tomography in caves with similar geometry can yield reliable results concerning the shape of bedrock surface, the thickness of sedimentary layers, and size and position of inclusions such as fallen fragments of roof therein.

About the Authors

V. V. Olenchenko
Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences
Russian Federation

Associate Professor, NSU; Leading Researcher, TIPGG.

Pirogova 1, Novosibirsk, 630090; Pr. Akademika Koptyuga 3, Novosibirsk, 630090



L. V. Tsibizov
Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences; Geophysical Center, Russian Academy of Sciences
Russian Federation

Researcher

Pirogova 1, Novosibirsk, 630090; Pr. Akademika Koptyuga 3, Novosibirsk, 630090; Molodezhnaya 3, Moscow, 119296



P. S. Osipova
Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences
Russian Federation

Doctoral Student, NSU; Junior Researcher TIPGG.

Pirogova 1, Novosibirsk, 630090; Pr. Akademika Koptyuga 3, Novosibirsk, 630090



T. T. Chargynov
Jusup Balasagyn Kyrgyz National University
Kyrgyzstan

Associate Professor

Frunze 547, Bishkek, 720033



B. T. Viola
University of Toronto
Canada

Assistant Professor

27 King’s College Circle Toronto, Ontario M5S 1A1



K. A. Kolobova
Institute of Archaeology and Ethnography, Siberian Branch, Russian Academy of Sciences
Russian Federation

Leading Researcher

Pr. Akademika Lavrentieva 17, Novosibirsk, 630090



A. I. Krivoshapkin
Novosibirsk State University; Institute of Archaeology and Ethnography, Siberian Branch, Russian Academy of Sciences
Russian Federation

Director, IAE; Department Chair, NSU.

Pirogova 1, Novosibirsk, 630090; Pr. Akademika Lavrentieva 17, Novosibirsk, 630090



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For citation:


Olenchenko V.V., Tsibizov L.V., Osipova P.S., Chargynov T.T., Viola B.T., Kolobova K.A., Krivoshapkin A.I. Peculiarities of Using 2D Electrical Resistivity Tomography in Caves. Archaeology, Ethnology & Anthropology of Eurasia. 2020;48(4):67-74. https://doi.org/10.17746/1563-0110.2020.48.4.067-074

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ISSN 1563-0110 (Print)