Faults are cracks in the Earth’s surface, found where earthquakes occur. There are three basic types of faults: normal, reverse and strike-slip. The type of a fault tells us about the forces acting upon it.

In a normal fault, the blocks either side of the fault are being pulled away from each other. The blocks move in the direction you would expect gravity to move them normally.

reverse fault is similar to a normal fault, except the fault blocks are moving towards each other.

In a strike-slip fault (also called a wrench or transcurrent fault) the blocks move alongside each other. The San Andreas fault in California and the North Anatolian fault in Turkey are both strike-slip faults.