Discussion
An accelerograph is required rather than a seismograph for engineering design because it
Answer: C
Correct answer: records strong motion without going off scale
A seismograph is built to detect very small distant events and saturates in strong shaking, precisely when the engineer needs the record. An accelerograph has a much lower sensitivity and a wide dynamic range, and it triggers on strong motion, so it captures the large amplitudes intact. Every response spectrum used in design comes from such a record.
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