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Fig. 11.56
Pseudo-topographies of the impedance phase
brd
in the presence of strong near-surface
noise: NP, CP, and MP are, respectively, the near-surface, crustal, and mantle prisms. The horizontal
scale of distances is given in kilometers, and the vertical scale of phases is given in degrees
whence
⎧
⎨
H
x
(
x
,
y
,
h
1
)
−
H
x
(
x
,
y
,
0)
E
y
(
x
,
y
,
0)
S
1
(
x
,
y
)
=
(11
.
24)
⎩
H
y
(
x
,
y
,
h
1
)
−
H
y
(
x
,
y
,
0)
−
.
E
x
(
x
,
y
,
0)
H
y
)
z
=
0
be known on the
Earth's surface. Then with the given underlying substratum we can transform
E
y
)
z
=
0
,
H
τ
(
H
x
,
Let the electromagnetic field
E
τ
(
E
x
,