RESTRAINING STEP BEHAVIOR ALONG THE NOBI FAULT SYSTEM, CENTRAL JAPAN

The Nobi fault system consists of en-echelon left-lateral strike-slip faults. Two restraining steps, the Midori and Hakusan upwarps, have fo rmed between the en-echelon faults, and have demonstrated different fa ilure behaviour. The Midori upwarp has developed into a secondary reve rse fault while the Hakusan one has not and is still a fold. Structura lly, the Midori upwarp is more evolved than the Hakusan upwarp. Recent faulting has had a shorter recurrence interval since c. 14, ka B.P. T his change may have been associated with the development of the second ary reverse fault through the Midori upwarp, as an effective linkage i n the Nobi fault system.