What is a fractured piece of crust along a large fault?

A fractured piece of crust along a large fault is known as a fault block. These blocks can move relative to one another due to tectonic forces, resulting in earthquakes and geological activity. Fault blocks can vary in size and are often characterized by distinct geological features, such as displacement and elevation changes. The movement of these blocks plays a crucial role in shaping the Earth's surface and influencing landscape formation.