Even worse, Mexico City is built on a bowl of jello.
"On this day in 1985, a powerful earthquake strikes Mexico City and leaves 10,000 people dead, 30,000 injured and thousands more homeless.
At 7:18 in the morning, the residents of Mexico City were jolted awake by an 8.1-magnitude earthquake, one of the strongest to ever hit the area. The effects of the quake were particularly devastating because of the type of ground upon which the city sits. Mexico City is on a plateau surrounded by mountains and volcanoes. The plateau region was covered by lakes in ancient times. As the aquifer under the city has slowly drained, it has been discovered that the city sits atop a combination of dirt and sand that is much less stable than bedrock and can be quite volatile during an earthquake."
From here...
http://www.history.com/this-day-in-h...es-mexico-city