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Fig. 11.50 Pseudo-topographies of the invariant
of the magnetic tensor: NP, CP, and MP are,
respectively, the near-surface, crustal, and mantle prisms. The horizontal scale of distances is given
in kilometers
M
effects of the crustal and mantle prisms in the interval of periods 250-10000 s are
actually undistorted.
Summing up, we can say that the magnetovariational response functions, [ W ]
and [ M ], resolve both the horizontal and vertical variations in the Earth's conductiv-
ity and are immune to the local near-surface galvanic distortions. There is every rea-
son to believe that magnetovariational functions specified in a wide frequency range
contain sufficiently complete parametric information on the geoelectric medium and
this information can be obtained without troubles caused by the static shift.
Next we consider the pseudo-topographies of the magnetotelluric response
functions.
Figure 11.52 presents the pseudo-topographies of the apparent resistivity
brd
=
.
constructed in the range of periods from 0.16 to 10000 s. At the period T
0
16 s,
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