Second -Derivate of MT Apparent Resistivity Data : A Possible Solution to Detectability

摘要

Very broad band of natural magneto telluric (MT) signal with signal penetration determined by theskin depth provides MT method capability to probe shallow and deep features equally well albeitwith decreasing resolution as the depth increases. We used a new processing scheme involvingsecond derivative of the apparent resistivity curve to enhance the effects of thin conducting layersin continental crusts at different depth which are otherwise masked in conventional resistivitypseudo sections. As the second derivative of apparent resistivity curve exhibits a peak/ trough foreach interface, the configuration of an interface can be easily marked in a seismic-like plot ofthese data. Analyses of synthetic data over two different models, viz., Deccan Trap, India andRhine Graben-Black forest region, Germany demonstrate the potential of the scheme developed.