The fault where rocks on either side move sideways past each other is called a strike-slip fault.

Here's a breakdown:

* Strike: The direction of a horizontal line on the fault plane.

* Slip: The movement of the rocks along the fault.

In a strike-slip fault, the slip is primarily horizontal, parallel to the strike of the fault. The movement can be either right-lateral (where the opposite side of the fault moves to the right) or left-lateral (where the opposite side of the fault moves to the left).

Famous examples of strike-slip faults include:

* San Andreas Fault: A right-lateral strike-slip fault in California, responsible for many earthquakes.

* North Anatolian Fault: A right-lateral strike-slip fault in Turkey, also associated with significant seismic activity.

Let me know if you have any other questions about faults!