Discussion
The rake (pitch) of slickenlines exposed on a moderately dipping fault plane is the angle between
Answer: B
Rake (pitch) is the angle between the strike of the fault plane and the slickenlines, measured on the fault plane.
Rake describes a line that lies within a plane, so it is measured in that plane, from the horizontal strike line to the lineation, between 0° and 180°. A rake near 0° or 180° means strike-slip movement, and a rake near 90° means dip-slip movement.
The angle between magnetic north and strike, on a horizontal surface, is the strike azimuth of the plane. An angle measured in a vertical plane is a plunge, which describes the line relative to the horizontal rather than within the fault plane. Trend and plunge are the two coordinates of the lineation itself; the angle between them is not a defined measurement.
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