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"Earthquakes tend to have the biggest effect on the surface, like waves on water. That's why LA can have a (lame, but getting better) subway."

https://twitter.com/elonmusk/status/824300186834898945

Tokyo and other Japanese cities have massive underground metro networks and there are earthquakes every single day. Even during the 2011 Tōhoku earthquake, there was not a single derailment.

Metro's subway tunnels survived the Northridge earthquake without suffering even a scratch.