Investigating alluvial and tectonic features with ground-penetrating radar and analyzing diffractions patterns |
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| Institution: | 1. Laboratoire Imagerie Tectonique, EOST ULP (UMR-7516), Inst. de Physique du Globe, Universite Louis Pasteur, 5 rue Rene Descartes, 67084, Strasbourg Cedex, France;2. Institut de Protection et de Sûreté Nucléaire, B.P. 6, 92265 Fontenay aux Roses Cedex, France;1. CONICET, and University of Buenos Aires, Saavedra 15, 5th floor, Buenos Aires, 1083, Argentina;2. University of Georgia, Department of Geography, Athens, GA 30602, USA;3. University of Mar del Plata-CONICET, IIMyC, Mar del Plata, Buenos Aires province, 7600, Argentina;4. University of Buenos Aires, Department of Anthropological Sciences, Puán 480, Buenos Aires, 1420, Argentina;1. Thermodynamics and Energy Technology, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany;2. Institute of Chemistry, Department of Physical Chemistry, University of Pannonia, P.O. Box 158, H-8201 Veszprém, Hungary;1. University of Bucharest, Faculty of Geography, Research Center for Integrated Analysis and Territorial Management (CAIMT), 4-12, Regina Elisabeta Avenue, Bucharest, 030018, Romania;2. Bucharest University of Economic Studies, Faculty of Management, 6, Pia?a Romana, Bucharest, 010374, Romania |
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| Abstract: | Ground-penetrating radar (GPR) experiments were conducted on a Quaternary sedimentary (made up of gravel, sand and loess) site to image the structures and tectonic features. Two sets of antennae, 50 and 100 MHz, have been tested in a water saturated alluvial deposits (mostly sand and gravel). The 100 MHz antennae provided adequate penetration depth and allowed better lateral continuity and resolution of the subsurface targets than the 50 MHz antennae. Results show that most of GPR data are contaminated by strong diffraction hyperbolae caused by above-ground objects near the survey line. Therefore, it is very important to recognize the diffractions through air and not to confuse them with the reflections from underground geologic features. Despite the air diffraction problem, the GPR data allow us to prospect subsurface sedimentary and tectonic structures. Water table, channels and meander bars are observed on GPR data. Most of these observations are correlated with borehole and trench data. |
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