Slingram Measurements in the Mecsek Mountains, Hungary

The so-called Slingram measurements form a family of frequency-domain electromagnetic methods, when the transmitter is a vertical magnetic dipole, and the vertical component of the magnetic field is measured, at some distance from the transmitter. The measured value is usually the imaginary (out-of-phase) part of the vertical magnetic field component. Such an equipment was manufactured at the University of Neuchâtel (Switzerland) and supplied to the Geodetic and Geophysical Research Institute in frame of a Swiss-Hungarian co-operation, supported by the Swiss National Research Foundation. As a part of test measurements, Slingram profilings and soundings were carried out for exploration of karstic water reservoirs connected to tectonically weak zones in the Mecsek Mountains, close to Pecs (Hungary). One-dimensional inversion and comparison with other geo-electromagnetic techniques as radio-magnetotellurics (RMT) and radiofrequency-electromagnetics (RF-EM) resulted in good and interpretable results.