The events are random, and in no way related to any other game worlds. (someone has speculated why "always" (?) an event or high fuel prices happen when a new game is about to start...but that's just random bad luck, I'm not tweaking those after game has started, it's all preprogrammed)
The major events, like this, do not occur within the first year/two/three of the start of the game (depending on the event's severity) in order not to immediately kill off the newcomers. Events of similar type are also grouped so that they won't appear near each others. (but you can have volcano and flu close since they are not of the same group).