The second category includes faults that have been active sometime in the last. 100,000 years, while faults that were last active more than 100,000 years ago fall into the third category.
十萬年來動過的斷層則稱為第二類活動斷層，超過十萬年以上的斷層垂垂老矣，列為存疑性斷層。