Discussion
Residual displacement after an earthquake matters because
Answer: D
Correct answer: the building may be left permanently off centre
A residual offset leaves the superstructure displaced relative to the ground, so the moat clearance in one direction is used up, the services crossing the plane are strained, and the capacity available for the next earthquake is reduced. The bearings still carry the vertical load and the period is essentially unchanged; the problem is the lost travel, which is why re-centring capability is specified.
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