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Fig. 11.49
Pseudo-topographies of the invariant
of the Wiese-Parkinson matrix: NP, CP, and
MP are, respectively, the near-surface, crustal, and mantle prisms. The horizontal scale of distances
is given in kilometers
W
periods
T
= 0.16, 40, and 10000 s, we can determine azimuths of all three prisms and
perform a trial 2D inversion for each prism ignoring the presence of other prisms.
Now come back to the initial model and introduce chaotically distributed small-
scale heterogeneities into the first sedimentary layer. Figure 11.51 presents the
pseudo-topography of the invariant
W
of the Wiese-Parkinson matrix and the
invariant
M
of the magnetic tensor constructed for this contaminated model. At
T
1 s, the effects of the near-surface and crustal prisms are lost in the geoelec-
tric noise produced by the local heterogeneities of the sedimentary cover. However,
already at
T
=
=
6
.
3 s, the effect of the crustal prism becomes noticeable and, at the
period
T
40 s, it exceeds significantly the level of geoelectric noise. With the
further decrease in frequency, the near-surface geoelectric noise disappears, and the
=
