Which fault involves one block being pushed into and sliding up onto another block?

• A. Reverse Fault
• B. Normal Fault
• C. Strike-Slip Fault
• D. Focus

Answer: (A)

This question tests how fault motion reflects the type of stress acting on rocks. Describing one block being pushed into and sliding up onto another clearly matches a reverse fault. Under compression, the hanging wall moves upward relative to the footwall, so the block above ends up riding up over the block below along a fault plane.

Other fault types involve different motions: a normal fault happens when rocks are pulled apart and the hanging wall drops down relative to the footwall; a strike-slip fault involves mostly horizontal sliding with little vertical motion; the focus is not a kind of fault but the point deep underground where an earthquake starts.