Yes, that being said, I would expect those same precautions to be taken in all regions, and thus not give a meaningful difference per region, between regions (if that makes sense).
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.
