MT CONTINUOUS PROFILING IN STRUCTURE AND LITHOLOGY RECOGNITION; POLAND’S CASE STUDIES

摘要

The magnetotelluric continuous profiling provides a specific modification of the magnetotelluric method. Its characteristic features include such a close sampling of the electric field component parallel to the measurement profile that an electric dipole length is equal to the measurement spacing. As a result, a continuous coverage of the measurement profile with electric dipoles is obtained. Sampling of the magnetic field and the electric field, which is perpendicular to the measurement profile is much poorer. The response of the magnetic field to geological structures is smaller than that of the electric field and therefore the magnetic field is oversampled when the measurement spacing of either field is the same. The electric field measured by means of several dipoles can be referred to the magnetic field measured by a pair of sensors. Since measurement profiles are usually transverse to the geological structures, the variations of the electric component perpendicular to the profile are weaker than those parallel to it.