Fig. 3
From: A geophysical investigation of the fairy circles in Nebraska for geologic hydrogen exploration
(a) High-resolution digital elevation model (DEM). (b) Uranium channel (eU) of radiometric data in an area of 1-degree by 1-degree. Radiometric data are sensitive to lateral heterogeneities of the radioelement concentrations near the surface. (c) Magnetic data in the same area as the radiometric data. Magnetic data can sense 3D magnetic heterogeneities down to a depth of 15 km in this case. The fairy circle over which geo-electrical data were collected is located near the central west edge of the area.
