Focused imaging of electrical resistivity data in archaeological prospecting |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China;2. College of Geophysics, Chengdu University of Technology, Chengdu 610059, Sichuan, China;1. Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India;2. Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India;1. Southern Illinois University Carbondale (Emerita), USA;2. Florida Museum of Natural History, USA;3. University of Florida (Emeritus), USA;4. University of Florida, USA;5. Queens College, CUNY, USA;6. CUDEP, Guatemala |
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| Abstract: | Electrical resistivity mapping and electrical resistivity profiling are powerful instruments for investigating archaeological structures. Interpretation of geoelectrical data is complicated by near-surface anomalies and the characteristics of the applied electrode arrays. Averaging Wenner α and Wenner β data as an alternative method of focused imaging is presented to overcome these problems. The mechanism of focused imaging is explained using the sensitivity distribution of the combined arrays. Various methods of imaging geoelectrical data are examined with synthetic and field data. In electrical resistivity mapping, inversion of the data is unnecessary when using focused imaging. In electrical resistivity profiling, focused imaging gives a first idea about the subsurface resistivity distribution without achieving the quality obtainable by inversion. |
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