Discussion
Surface waves are generally more damaging to structures than body waves because they
Answer: A
Correct answer: have larger amplitude and longer period
Surface waves are confined to a thin layer near the surface, so their energy spreads in two dimensions rather than three and attenuates far more slowly with distance. They therefore arrive with large amplitude and long period, and their periods often fall close to the natural periods of buildings, which produces resonance. They also arrive last, being the slowest, and they last longer.
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