Abstract
In VLF-observations uneven terrain relief causes distinct anomalies that originate from elliptic field polarization. This slope rotation field is produced by the interference of the radiated horizontal magnetic field with a component reflected by the earth's inclined surface. A diagram has been developed to provide the tilt and eccentricity (ratio of half axes) of the slope rotation ellipse, if the dip of the slope along the direction of the radiated magnetic field is known. It turns out to be possible to separate the influence of relief from that of local conductive bodies. The application is demonstrated on field data gathered in areas of hilly terrain.
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