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1 Acta Geophysica Polonica

1 2003

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Studies on multiple electric discontinuities and dipping anisotropic conditions using multifrequency magnetotellurics

Nagubai D., Saraf P.

Acta Geophysica Polonica

2003

Vol. 51, nr 3

323-335

The Earth is characterized by many irregulars in its physical parameters. Recent deep EM and MT investigations have established that the upper crustal layers are inhomogeneous and anisotropic in their electrical properties. The problem of incorporating inhomogeneities (both in vertical and horizontal directions) is of considerable interest to geophysicists. Hence, an attempt has been made to compare the influence of dipping anisotropy in layers at different depth. Emphasis has also been given to explore the approximate frequency ranges needed to resolve the anisotropy in the subsurface layers at different depths. To achieve this, several numerical studies have been carried out in a three-layer Earth model for different meaningful combinations of thickness of the layers, conductivities, and frequencies of the EM wave parameters Our results show that the negligence of anisotropy nay produce serious errors in delineating subsurface structures. It is also shown that the electrical discontinuities played a major role in mapping anisotropic and dipping subsurface conditions.