Abstract
The objective of this chapter is to briefly describe dip angle and strike. The dip angle is the angle that a set of joints extends against the horizontal plane. Each set of joints has a dip angle and a strike. The strike is the direction that the horizontal plane and dip direction intersect. The dip direction is different from the dip angle. Strike and dip directions are perpendicular to each other. Furthermore, this chapter elaborates oriented coring procedure. Oriented coring produces a dip angle and a strike angle for each joint. A joint can be represented by one point known as the pole. Theoretically, there are two poles for any given joint, one in the lower hemisphere and one in the upper hemisphere. The pole in the lower hemisphere is always selected. Charts are available to obtain the pole point for any given joint.
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