Nuclear reactors are sometimes built in geologically quiet regions
called by geologists because such regions are distant from plate boundaries and contain only minor faults. Since no minor fault in a geologically quiet region produces an earthquake more often than once in any given 100, 000-year period, it follows that of all potential nuclear reactor sites in such a region, those that are least likely to be struck by an earthquake are ones located near a fault that has produced an earthquake within living memory.
In a geologically quiet region, every potential nuclear reactor site is near at least one minor fault.