There are three or four primary fault types:

• Normal Fault – Occurs when the “hanging wall” moves down relative to the “foot wall” . These faults typically occur due to extensional stress.
• Reverse or Thrust Fault – Occurs where the hanging wall moves up or is thrust over the foot wall. These faults are formed due to compressional forces. The difference between a reverse and thrust fault is the dip of the fault plane. Thrust faults are more shallowly dipping.

• Strike Slip Fault – Near vertical fault where one side moves laterally relative to the other side. These faults occur due to shear stresses,