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Fig. 6.3
Longitudinal and
transverse impedance-phase
curves in the vertical-
interface model. Observation
site is located over the left
quarter-space. Curve
parameter:
/
vicinity of the vertical interface. With lowering frequency, the anomalies of
E
x
and
H
y
flatten out. This effect can be considered as the
horizontal skin effect.
The transverse electric field
E
y
varies also from the left normal field
E
N
=
E
y
√
/
to the right normal field
E
y
, but now it has a jump at the vertical interface
due to surface excess charges. The characteristic feature of the transverse electric
field is that its jump is preceded in the left quarter-space by almost a tenfold drop
in
E
y
, which is getting steeper when frequency increases. This effect is associated
with rearrangement of the transverse current due to different skin depths in the left
and right quarter-spaces. It bears the name of the
current rearrangement effect.
Next we consider the frequency responses of the real and imaginary parts of
the tipper
W
zy
at a site over the left quarter-space (Fig. 6.6). It is remarkable
that the Re
W
zy
,
y
/
=
/
=
.
Im
W
zy
-curves for
10 and
0
1 are aproximately
