Discussion
Acceleration of the ground matters to a structure because it produces
Answer: D
Correct answer: inertia forces on the mass of the structure
An earthquake shakes the base, and the structure resists that motion through its own inertia; the force on each mass is that mass times its acceleration. This is why earthquake force is proportional to weight, and hence why lightweight construction is favoured in seismic regions - the exact reverse of the situation under gravity loading.
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