Different regions have different types of worries. Distance and precautions required to deal with redundancy for an earthquake may not be the same as required

Different regions have different types of worries. Distance and precautions required to deal with redundancy for an earthquake may not be the same as required for a tornado, or hurricane, or flood, etc. In some cases, I imagine elsewhere in the same large city may suffice. In others, maybe it requires 50-100 miles.