Geoscience Reference
In-Depth Information
Apparent dip values (solid lines) and thickness exaggeration
factor for sections at an angle to true dip direction
Apparent dip
80°
10°
85°
75°
65°
70°
55°
45°
20°
60°
50°
40°
1.1
30°
30°
35°
25°
1.25
40°
20°
1.5
15°
50°
1.7
2.0
10°
60°
2.5
3.0
4.0
5.0
7.0
10.0
5°
70°
80°
10°
20°
30°
40°
50°
60°
70°
80°
Angle between
cross-section and
dip direction 60°
True dip 45°
True dip value
Figure A10.2
A graph to determine the apparent dip angles (solid, curved lines) and the thickness
exaggeration (curved blue lines) for bedding in cross-sections that are not parallel to the true dip direction (i.e.
where the strike of bedding is not perpendicular to the line of section). An example is given on the diagram (red
lines) for bedding with a true dip of 45° on a cross-section orientated at 60° to the dip direction. In this case,
the apparent dip of 27° can be read off the graph, and the thickness of bedding will be 1.275 times the actual
thickness. (Modifi ed from McClay 1991.)
