Discussion
Consider the following statements about ground motion parameters.
1. Acceleration is governed mainly by high frequencies.
2. Displacement is governed mainly by low frequencies.
3. Velocity is governed mainly by intermediate frequencies.
Which of the statements are correct?
Answer: A
Correct answer: 1, 2 and 3
All three are correct and together they explain why three amplitude parameters are needed rather than one. Differentiation emphasises high frequencies and integration emphasises low ones, so acceleration is dominated by the high end of the spectrum, displacement by the low end, and velocity by the intermediate range in between.
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