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Resolution of the ground-penetrating-radar (GPR) method largely depends on the wavelength of the propagated electromagnetic waves, the depth, and the dimensions of the investigated targets. Locating small-scale targets such as fractures can be difficult, especially when the size of the fractures themselves and the spacing between them are smaller than the wavelength of the EM waves. In such cases, fractures will not be resolved individually in the time domain. Examining the frequency (spectral) content of GPR time series might provide additional information that can improve fracture location relative to the results from conventional examination of the time series alone....

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