I think that depends on the calamity itself. For tsunamis, I think if we go to higher lands, like Curepipe, we should be able to avoid it provided the waves do not cover Mauritius completely.
For earthquakes, well it's like lightning, you don't know where it's going to strike but there are houses which can be built to withstand the shocks of earthquakes.
If you don't live near volcanoes, you should be fine unless the eruption is so strong that nowhere is safe.
For all the others, the best thing to do is to have an underground living facility with enough food supplies but then again, what do you do when you run out of food.
It's probably best not to think about all those things otherwise, you'd be too scared to even go outside.