Full text loading...
-
The Topography Effect on the Airborne EM Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Saint Petersburg 2018, Apr 2018, Volume 2018, p.1 - 6
Abstract
The paper is devoted to one of the aspects of multidimensional interpretation airborne electromagnetic (EM) data in the time domain, which relates to the question of the topography effect on the measured signals. Using the 3D modeling of airborne EM data for a geoelectrical model including the surface relief and target object in the form of a tube, which are typical of one of the areas in Eastern Siberia, we analyze the differences between the signals obtained when the topography is taken into account accurately and those obtained when the topography is taken into account approximately by the corresponding correction of the transmitter-receiver altitudes over the horizontal ground surface. It is shown that the signal changes caused by ground surface relief can easily be confused with the signals caused by other inhomogeneities including target objects. Therefore, for correct data processing, it is necessary to use the 3D inversions with quite an accurate accounting of the ground surface relief.