Keeping still or staying in motion The CGS divides faults into three groups according to current information about the history of fault line activity. The first group consists of faults that have been active sometime over the past 10,000 years. These are the ones most likely to move again and are the most dangerous.
中央地質調查所也將已知的斷層依曾經活動過的時間分類，距今約一萬年內活動過的斷層，由於未來活動的潛力較大，屬於高危險群，列為第一類活斷層。