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Fig. 8.33
Two-dimensional models of the asthenosphere uplift. The model IAU-II contains an
isotropic asthenosphere uplift, the model AAU-II contains an anisotropic asthenosphere uplift with
alternating horizontal layers of higher and lower resistivity
⎡
⎤
xx
00
AA - I
=
⎣
⎦
,
0
yy
0
00
zz
where
m.
We see that the apparent-resistivity and tipper curves obtained in the mod-
els IA-I and AA-I are close to each other (anisotropy-isotropy equivalence). But
with decreasing the lithosphere resistance, the equivalence between isotropy and
anisotropy in the asthenolith disappears. Figure 8.35 shows the models IA-II and
AA-II with the lithosphere resistance of 1.5
xx
≈
18
.
2Ohm
·
m
,
yy
=
55 Ohm
·
m
,
and
zz
≈
18
.
2Ohm
·
·
10
8
·
m
2
. Here the transverse
Ohm
