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Fig. 8.34
Two-dimensional models of the asthenolith. The model IA-I contains an isotropic
asthenolith, the model AA-I contains an anisotropic asthenolith with alternating vertical layers
of higher and lower resistivity. The lithosphere resistance 1.5
10
9
m
2
·
Ohm
·
apparent resistivity and impedance-phase curves obtained over the asthenoliths
(
y
0) noticeably differ from each other.
We would like to stress again that the main factor that conditions the equivalence
between isotropy and anisotropy is the lithosphere resistance defining the screen-
ing effect. The least favorable for studying the anisotropic asthenosphere are the
=
