Magnetotelluric observations over the Rhine Graben, France: a simple impedance tensor analysis helps constrain the dominant electrical features

Details Magnetotelluric observations over the Rhine Graben, France: a simple impedance tensor analysis helps constrain the dominant electrical features Magnetotelluric observations over the Rhine Graben, France: a simple impedance tensor analysis helps constrain the dominant electrical features

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...74..191m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 74, Issue 3-4, p. 191-197.

Physics

1

Scientific paper

A simple impedance tensor analysis of four magnetotelluric soundings recorded over the ECORS section of the Rhine Graben shows that for periods shorter than about 30 s, induction dominates over channelling. For longer periods, 2-D induction galvanically distorted by surface heterogeneities and/or current chanelled in the Graben can explain the observations; the role of chanelling becomes dominant at periods of the order of a few hundred seconds. In the area considered, induction appears to be controlled by inclusions of saline water in a porous limestone layer (Grande Oolithe) and not by the limits of the Graben with its crystalline shoulder (Vosges). The simple analysis is supported by tipper analyses and by the results of schematic 2-D modelling.

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