Information Technology Reference
In-Depth Information
0.0004 Ohm
a
0.001 Ohm
b
c
45°
d
0.0017 Ohm
0.0017 Ohm
e
45 °
45°
g
f
Fig. 11.41 Polar diagram of the impedance tensor and phase tensor in the superimposition model
shown in Fig. 2.3; the model contains a near-surface local resistive
-shaped inclusion and a deep
, b - diagram of Z xy ,
regional conductive 2D prism. Impedance tensor: a - diagram of
|
Z xx |
c-diagramof arg Z xy ; Polarized impedances: d - diagram of E -polarized impedance, e - diagram
of H -polarized impedance; Phase tensor: f - diagram of
xx , g - diagram of
xy
Figure 11.42 exemplifies relationships between magnetotelluric and magne-
tovariational low-frequency polar diagrams plotted along the same profile as in
Figs. 11.36. No regularity can be seen in the behavior of the diagrams of
|
Z xy |
and
. Their shape and orientation vary chaotically. This should be ascribed to
a strong effect of local near-surface 3D inhomogeneities, producing random noise.
The diagrams of
|
Z xx |
are more stable with respect to near-surface distortions.
At many sites they are elongated in the submeridional direction, reflecting the
sublatitudinal strike of the regional 2D structures. The most informative are the
tipper diagrams. All of them are oriented in the submeridional direction, their waist
|
arg Z xy |
Search WWH ::




Custom Search