Geography also favored Chile when it came to the earthquake's impact. The epicenter was 21 miles offshore and the closest big city was 70 miles away whereas the earthquake in Haiti was almost directly under Port-Au-Prince. Also you cannot really blame Haiti for lack of preparation since it had not had an earthquake in 200 years.
I would also like to note that the impact of the earthquake in Chile is apparently much worse than originally thought. Tsunamis devastated the coast, and roads, water, electricity, and communications have pretty much been wiped out in Conception. It is also worth noting that the part of Chile that was struck is the poorest part of the country, and it has suffered "looting" and lawlessness much like Haiti did. I put "looting" in quotes because I really cannot blame hungry and thirsty people for getting food any way they can.
I'm just waiting for Pat Robertson to tell what the people of Chile did to bring down God's wrath as he did when Haiti was struck.
