Fault zone characteristics between two faults (Gero and Yugamine Faults of the Atera Fault System) arranged in parallel

Niwa, Masakazu   ; Mizuochi, Yukihiro*; Tanase, Atsushi*

We described features of fault zones where active faults are arranged in parallel for understanding the interaction of the two faults. We selected the Atera Fault System in central Japan as a case study. In the studied area, two sets of fault zones, subparallel (NW-SE to E-W trend) and high-angle oblique (NE-SE to N-S trend) to the active fault planes, are developed. The fault zones of NW-SE to E-W trend cut those of NE-SE to N-S trend and trace more recent fault activities.