How do you know the faulting of rock happened a short time ago?

You can determine that faulting of rock occurred recently by examining geological features such as fresh rock surfaces, unweathered fault planes, and displaced strata that show little to no erosion. Additionally, the presence of seismic activity, such as aftershocks or ground deformation, can indicate that the faulting is still active. Radiometric dating of materials associated with the fault or the examination of sediment layers can also provide evidence of relatively recent geological events.