In my mind? Earthquakes are the worst, because I would not want to buried alive. If I were killed outright? No problem, but earthquakes leave living victims buried under rubble.

Having said that? I also think that the worst natural disaster is the one that happens to you.

Agony. Someone goes to die, and experiences the end of the whole world individually.

Japan's earthquake

We will still be feeling the effects for years to come.

Spanish flu killed more people than the whole of the causalities of WW1.