Rock units offset by faults allow for the identification of faults in the field even when the fault plane itself is not accessible.
In geology, a fault is a flat or slightly curved fracture in the rocks that make up the Earth's crust where compressional or tensional forces cause the rocks on either side of the fracture to move relative to one another. Few centimeters to many hundreds of kilometers is the range in length of a fault, while less than a centimeter to many hundreds of kilometers is field the range in displacement along the fracture surface (the fault plane).
In some cases, the movement is dispersed along a belt of field faults that is hundreds of meters wide and is made up of numerous separate faults. Flaws are distributed differently across different geographic regions; some big areas have essentially no faults, while others have countless faults.
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