Just Richter 6.0 events. As both many Gabonese and many New Caledonians speak French, were Gabon able to scramble trained rescue workers they'd have an easier time being managed without a language barrier.
It is also much cheaper financially and psychologically to get experience doing rescue and recovery work on someone's else nickel, so as to speak. We note that usually the first thing rescue workers talk about on the flight home is urging their own government to be prepared. For any world leader who has never personally seen just how destructive Planet Earth can be, we strongly suggest visiting any recent catastrophe. No need to wait until the next disaster. It might be yours.