Environmental Engineering Reference
In-Depth Information
Pole
N
X
E
W
Y
S
FIGURE 6.9
The same structural plane of Figure 6.8
as visualized in spherical projection.
(From Badgley, P. C., Structural Methods
for the Exploration Geologist, Harper &
Bros., New York, 1959. With
permission.)
Fundamental
plane
Zenithal point
Stereographic projection of
a bed striking 335
°
(N 25
°
W)
and dipping about 30
°
to the
Meridian
(Great circle)
southwest
N
10
10
30
40
50
60
70
80
Small circle
E
W
Small circle
S
Meridian
(Great circle)
Spherical projection of
a bed striking 335
°
(N 25
°
W)
and dipping about 30
°
to the
southwest
FIGURE 6.10
Stereographic projection on a planar surface. Three-dimensional view of a bed striking 335º (N25ºW) and
dipping about 30º to the southwest. This illustration shows the relationship between spherical and
stereographic projections. Study of this diagram shows why all dip angles on stereographic projection should
be measured only when the dip direction (plotted on overlay tracing paper) is oriented east-west. Similarly,
the stereographic curve can only be drawn accurately when the strike direction on overlay paper is oriented
parallel to the north-south line on the underlying stereo-net. (From Badgiey, P. C., Structural Methods for the
Exploration Geologist, Harper & Bros., New York, 1959. With permission.)
 
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