Active faults are structure along which we expect displacement to occur. By definition, since a shallow earthquake is a process that produces displacement across a fault, all shallow earthquakes occur on active faults. Inactive faults are structures that we can identify, but which do no have earthquakes.
Inactive faults can become active again. In our case there are no signs of that, although UP seismologists remain observant. This diagram shows an earthquake along a fault. ... Active Faults are those faults that are still subject to Earthquakes, those that are hazards.
All the faults on Earth are not active. ... When the stress conditions evolve, faults get deactivated or reactivated. Major faults are mainly found at the boundaries between tectonic plates, but active faults also exist within tectonic plates.
Faults inactive for long period could pose greater hazard'.
In general, larger faults make larger earthquakes. All faults, regardless of size, can be dangerous if they rupture.