Discussion
A site with low average shear wave velocity is expected to
Answer: B
Correct answer: amplify the motion relative to rock
As a wave passes from stiff rock into softer soil its amplitude must increase to carry the same energy flux through a medium of lower impedance, and resonance within the soil column amplifies it further near the site period. Soft sites therefore shake harder and at longer periods than nearby rock sites, which is what devastated Mexico City in 1985.
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