Faults are fractures or zones of fractures in the Earth’s crust along which there has been relative movement of the blocks on either side. On the basis of the geometry of movement and the relative displacement of the hanging wall and footwall blocks, faults are classified into different types. Geometrical classification focuses on the direction of movement with respect to the fault plane and provides insight into the stress regime responsible for faulting. The simplest geometrical classification is based on the direction of displacement relative to the fault plane. Dip-slip faults are those in which the movement of the blocks is mainly along the dip of the fault plane. In a normal fault, the hanging wall block moves downward relative to the footwall block. Such faults are produced by tensional stresses that cause extension of the crust and are common in rift valleys and continental margins. The fault plane usually dips at a moderate to high angle, and the vertical component of displacement is dominant. Normal faults often occur in sets, forming step-like structures