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According to a United Nations study of disasters, this year, urban population will surpass rural population in the world and cities are becoming megacities.  Should disaster strike, it could be 100 times more deadly than the tsunami's in Indonesia that killed more than 200,000 people.  Megacities are cities that have more than 10 million people. Of the 10 megacities in the world, 8 are prone to earthquakes including Mumbai, Mexico City, Bogota, Shanghai, Manila and Jakarta.

According to a 2005 Earthquake and Megacities Initiative report, the top five disaster cities are  Tokyo, Mexico City, Bombay, Sao Paolo and Dehli. In this report, the UN listed the five most populated cities in the world :  the greater Tokyo area with 35.3 million people, Mexico City with 19 million, New York-Newark with 18.5 million and Bombay and Sao Paulo both with a population of 18.3 million.

Here is the Earthquake and Megacities Initiative site.