Structural Health Monitoring (SHM) system requires a fast and accurate algorithm for defect detections in the large structures like aircraft skins for which Lamb wave tomography (LWT) appears to be very powerful technique, as their propagation properties depend on the thickness and the mechanical properties of the material. Projection data is collected by electronically scanning an array of ult...

Ground-penetrating radar (GPR) crosshole tomography is widely applied to subsurface media images. However, the inadequacies of ray methods may limit resolution images, since method a type high-frequency approximation. To solve this problem, full waveform introduced for GPR inversion. inversion computationally expensive. In paper, we introduce trained neural network that can be evaluated very qu...

Heterogeneous glacial deposits dominate large parts of the Northern Hemisphere. In these landscapes, high-resolution characterization geology is crucial for understanding contaminant transport. Geological information mostly obtained from multiple boreholes drilled during a site investigation, but such point-based data alone do not always provide required resolution to map small-scale heterogene...

Knowing the centimeter-to meter-scale distribution of sand in clayey deposits is important for determining dominating water flow pathways. Borehole information has a high vertical resolution, on millimeter- to centimeter-scale, but provides poor lateral coverage. For highly heterogeneous deposits, such as glacial diamicts, this detailed borehole may not be sufficient creating reliable geologica...

Geophysical methods are important tools for a wide range of geological, hydrogeological, and engineering investigations. Conventional processing techniques for electromagnetic tools often use approximations that may be either inappropriate or only provide limited resolution. Higher resolution images can be derived by using more sophisticated approaches that explicitly take into account the elec...

A of seismic waves is sensitive to the physical properties of the subsurface and has been observed in vertical seismic profiling (VSP) and reflection data. De et al. (1994) report measurements of the Pand S-wave quality factors from VSP surveys and sonic logs. Klimentos (1995) measures compressional and shear attenuation from sonic logs in sandstone formations with variable oil, water, and gas...