Here's why:

* Crustal Shortening: This occurs when tectonic plates collide, causing the Earth's crust to compress. The rocks are squeezed together, leading to a decrease in the horizontal distance between points on the Earth's surface.

* Thrust Fault: A thrust fault is a type of reverse fault where the hanging wall (the block of rock above the fault plane) moves upwards and over the footwall (the block below the fault plane). This upward movement is driven by the compressive forces associated with crustal shortening.

Other details:

* Thrust faults are typically characterized by a low dip angle (less than 45 degrees).

* They can create mountains and other uplifted landforms.

* They are common in areas of plate convergence, such as mountain ranges.

Let me know if you'd like to explore other types of faults!