Diffractions caused by faults, fractures, and small-scale heterogeneity localized near the surface are often used in ground-penetrating radar (GPR) reflection studies to constrain the sub-surface velocity distribution. Interference with reflected energy makes the identification of diffractions difficult. To improve identification of diffractions and improve velocity estimation, we apply diffraction imaging techniques developed for seismic data processing to our surface-based reflection GPR data. We demonstrate and discuss the improved GPR velocity estimation produced by the diffraction imaging approach, and how it may result in higher resolution GPR images of small-scale faults and fractures after migration.


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