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Fig. 7.34
yx
distorted by the flow-around and current-
gathering effects in the vicinity of a resistive (
S
1
/
Apparent-resistivity curves
xy
and
S
1
16) or conductive (
S
1
/
S
1
=
1
/
=
16) inclu-
xy
(
S
1
/
S
1
)
=
yx
(
S
1
/
S
1
). The observation is carried out at the site
x
sion,
=
0
,
y
=
1
.
5
b
.Curve
parameter:
a
/
b
,
model parameters:
2
/
1
=∞
,
3
/
1
=
0
,
h
2
/
h
1
=
20
The distortions can be somewhat suppressed using the Berdichevsky scalar
impedance.
Figure
7.35
demonstrates
the
apparent-resistivity
curves
brd
=
2
1
/
1
)
1
/
1
).
|
Z
brd
|
/
0
,
where
Z
brd
=
(
Z
xy
−
Z
yx
)
/
2
.
Note that
brd
(
=
brd
(
1
/
1
Given
=
1/16 or 16, the curves of
brd
calculated for
a
/
b
from 0.1 to 1
approach the normal curve ˙
n
.
Figure 7.36 presents the apparent-resistivity curves of
xy
and
yx
obtained over
|
|
the inclusion (
<
b
). Here the fields
E
τ
and
H
τ
are uniform, so that the impedance
tensor does not depend on the position of the observer. At
a
y
/
→∞
we have
a two-dimensional resistive or conductive inclusion directed along the
x
-axis. The
b
