ABSTRACT
The ranges of distribution of off-fault displacement occurring apart from the main fault are very important threshold values for city planning, mitigating hazards, etc. Analog experiments using wheat flour examined the evolutions and distributions of dip-slip off-fault displacements (fault dip angles of 30° and 60°). The experiments have conducted repetitions of up or down movement of the basal fault, and surface displacements have been measured with a 3D scanner on every incremental displacement. Some off-faults show no displacement with the incremental main fault displacement. Most of the off-fault displacements occurred on the hanging-wall side. The off-fault distributions of analog experiments indicated a similar distribution compared with the off-fault displacement attenuation relation, which has been constructed from field observations compiled from reverse faulting earthquakes.
