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Fig. 11.54
A
: NP, CP, and MP are, respectively, the
near-surface, crustal, and mantle prisms. The horizontal scale of distances is given in kilometers,
and the vertical scale of phases is given in degrees
Pseudo-topographies of the aparent phase
model (Berdichevsky and Dmitriev, 2002). Here some inaccuracies are possible due
to distorting influence of geoelectric inhomogeneities.
The geophysical literature offers several approaches providing more adequate
determination of the sediments conductance (Schmucker, 1971b; Vasseur and
Weidelt, 1973; Obukhov et al., 1983; Berdichevsky and Zhdanov, 1984; Singer and
Fainberg, 1997). We restrict our consideration to the Singer-Fainberg method as
well as the Obukhov method which reduce the conductance determination to more
or less simple arithmetic.
11.5.1 The Singer-Fainberg Method
The basic model in this method consists of an inhomogeneous thin layer resting
on the one-dimensional resistive substratum that can contain conductive layers at a
