How did Haiti prepare for their earthquake?

You can predict earthquakes by calculating the occurrence interval (how common certain magnitudes of a type of disaster are for a location), the larger the event the less common it will be. you can also look at the position of the fault lines and tectonic plate and how long it is since they have moved. There are also usually some ground tremors before the actual earthquake that would give warning. Haiti prepared terribly because it was extremely poor.