Discussion
Bracketed duration of a strong motion record is the interval between the
Answer: C
Correct answer: first and last exceedance of a threshold acceleration
Bracketed duration takes a threshold, conventionally 0.05 g, and measures the interval between the first and the last time the record crosses it. Everything before and after is disregarded as too weak to matter. The definition is arbitrary in its threshold but useful, since it isolates the part of the record that actually does damage.
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