Abstract
Ground Penetrating Radar (GPR) images are affected, to some degree, by the relative orientation of antennas and subsurface targets. This is particularly true not only for targets that show a significant directivity, but also for inclined planes, such as fractures and faults. Depending on the relative geometry between the antennas and the orientation of the target, radar waves can be preferentially scattered, which causes changes in the reflected signal amplitude. Therefore, traditional single polarization and single azimuth surveys may produce inadequate results. The work presented here examines the use of a multi-azimuth GPR survey to increase the imaging performance of inclined fractures, showing the shortcomings of single-profile surveying and highlighting the benefits that such a strategy has on detection and characterization.
Highlights
Among the currently employed geophysical techniques, Ground Penetrating Radar has been found to be a useful tool for near surface investigation of the Earth’s subsurface, providing high resolution imaging capabilities and efficient data collection [1,2]
Ground Penetrating Radar (GPR) prospecting has been successfully exploited in civil engineering, archaeology, geology and forensic applications [3,4,5,6]
GPR prospecting is applied with regard to mines and pits to assess the risk of rockslides, for which knowledge of the complex fracture system is fundamental
Summary
Among the currently employed geophysical techniques, Ground Penetrating Radar (hereinafter addressed with its abbreviation GPR or georadar) has been found to be a useful tool for near surface investigation of the Earth’s subsurface, providing high resolution imaging capabilities and efficient data collection [1,2]. GPR prospecting has been successfully exploited in civil engineering, archaeology, geology and forensic applications [3,4,5,6]. GPR prospecting is applied with regard to mines and pits to assess the risk of rockslides, for which knowledge of the complex fracture system is fundamental. Several studies have demonstrated that GPR surveying can be used successfully to detect and map fractures, and especially to estimate their properties [11,12,13,14,15,16]
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