抄録
It implemented A-ray survey as the technique of the geophsical exploration which detects a fault and it detected fracture width. The following relation is admitted among the fracture width and the vertical displacement. The more vertical displacement (Δ H) is, the more fracture width (FW) gets widely. The relational expression is admitted by vertical displacement (Δ H) and fracture width (FW) Δ [H=3∼ FW]. After verifying the relational expression about the Emmyouji fault, the vertical displacement which is calculated from fracture width and the vertical displacement which was made clear in the boring exploration are same. The result of reviewing average slip rate from the relational expression with fracture width, the active fault number ratio which is extracted at present, the active fault number ratio which is calculated from the relational expression with fracture width and the earthquake occurring number ratio are 1: 3: 5. It is necessary to reconsider the activity standard (average slip rate) for the solution of the C class active faults problems about the number of the active fault existence.
