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Fig. 1.6
Illustrating the
construction of a
(3D + 2D)-superimposition
model by
Berdichevsky-Dmitriev's
hybrid method
0
Z
[
Z
R
]
=
.
(1
.
79)
Z
⊥
−
0
At the second stage, we determine the electric and magnetic distortion tensors [
e
]
and [
h
], solving the three-dimensional problem for the inclusion L and the prism R
with w
R
→∞
. Using the low-frequency thin-sheet approximation, we find
e
xx
e
xy
[
e
]
=
.
(1
.
80)
e
yx
e
yy
To find the magnetic distortion tensor, we evaluate the excess current in the sed-
iments:
S
E
S
S
1
E
R
J
=
−
S
1
=
(1
.
81)
h
1
/
1
outside L
inside L
S
=
S
L
=
h
1
/
L
and calculate the anomalous magnetic field from conditions of its discontinuity at
the current layer:
