Final answer:
If displacement is parallel to the dip of the fault, the fault is a dip-slip fault. Dip-slip faults are characterized by vertical movement along the dip of the fault plane and can be either normal faults or reverse faults, with reverse faults including a subtype called thrust faults.
Step-by-step explanation:
When a displacement occurs parallel to the dip of a fault, this type of fault is known as a dip-slip fault. Dip-slip faults involve vertical movement of the blocks along the dip of the fault plane. These faults can be further classified into normal faults, which occur during extension of the Earth's crust where the hanging wall moves down relative to the footwall, and reverse faults, which occur during compression of the Earth's crust with the hanging wall moving upwards. An additional subtype of reverse fault, where the dip is gentle, often less than 30°, is known as a thrust fault.
sense of motion, age of faults, and relations to continental rifting, among other geological features, are important considerations in defining the type of fault and understanding the geologic history of an area. Measurements of strike and dip help geologists determine the orientation of geological layers and fault planes, vital in mapping and comprehending geological structures.