[LoneRangerMassachusetts]

They are trying to address that, although I don't know how feasible it really is for complete safety. If there were a real earthquake, the tube would have to be shutdown immediately. And if you are travelling at 700 miles an hour and it moves, you'd become a statistic. But if they are safe on every other occasion, they would still be better than cars.

Earthquake dislocation is simply solved with base isolation supports.

[Procyon]

In event of earthquake isolation supports damp the shaking but this system has to cross fault lines which will shear in the next big one. A slip of up to 30 feet has been recorded in a single earthquake along this fault.