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line). The initial and synthetic fields are seen to be in reasonable good agreement.
This result is characteristic of rather wide frequency range, from
λ
1
/
h
1
=
16 to
π
√
2
λ
1
/
1
/
o
is the wave-length in the upper layer. But
note that such a good agreement is possible if
Z
xy
and
W
zy
are given on sufficiently
long profile. In our case, with depth and width of the lower conductive zone being
3h
1
and 6h
1
, good accuracy of the magnetic field reconstruction is attained when
the impedance and tipper are specified at distances of up to
h
1
=
64, where
λ
1
=
2
±
25h
1
.
