Discussion
High-frequency noise is removed from a strong motion record by
Answer: D
Correct answer: low-pass filtering
A low-pass filter passes the low frequencies and attenuates those above the chosen corner, so it removes high-frequency noise while leaving the engineering-significant motion intact. High-pass filtering does the opposite and is used at the other end of the band, to remove long-period drift before integration. Differentiating would amplify the noise, and raising the sampling rate merely records it more faithfully.
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