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Fig. 3.10
The Groom-Bailey decomposition for the superimposition model shown in Fig. 1.11;
t
s
- twist-angle and shear-angle; vertical bars characterize the data scattering caused by
measurement noise, FA - favorable area, 1-data for the noise-free local impedance, 2-true data
and
R
1
R
where
2
are principal values of the regional impedance tensor (the longi-
tudinal and transverse impedances). Rotating the regional impedance [
Z
R
] trough
the clockwise angle
and
=
L
−
R
, we pass to the local coordinate system with the
x,y
-axes along and across the strike of the local structure. According to (1.27),
Z
3
Z
1
Z
3
sin 2
+
cos 2
[
Z
R
(
)]
=
,
(3
.
36)
Z
1
Z
3
Z
3
−
+
cos 2
−
sin 2
where
