1. Tokyo, Japan
Metro area population: 35,682,460
The biggest city on a major earthquake fault line is Tokyo. The only active fault line beneath the capital of Japan is Tachikawa Fault. The last activity along it has been more than 1,000 years ago and scientists believe that probability of major earthquake originating from Tachikawa is very low. Unfortunately for residents of Greater Tokyo Area, there are plenty of other fault lines crisscrossing Japan that could prove disastrous for one of the most densely populated population centers in the world. Tokai Fault line and Japan Median Fault lines are just two of the major fault lines that could bring destruction to the city. To complicate the situation further, a piece of Pacific tectonic plate is stuck under the city and is exposed to the enormous pressure.
