Abstract
This study revealed the subsurface geological structure under the flexure scarp of the Yokkaichi Fault, based on arrayed boring cores with their radiocarbon dates, to evaluate the paleoseismicity of the fault since the late Pleistocene.
The Holocene sediments can be divided into 5 units, and cumulative fault displacement was recognized. The average vertical slip rate of the fault is 1.2-1.8mm/yr during the last 10,000 years. This rate is equivalent to that of the Yoro-Kuwana Fault. The timing and vertical offset of the last three faulting events are probably the same as those of the Kuwana Fault, as has been shown in recent studies.
Those results support the idea that the Yokkaichi Fault played the same behavioral segment as the Yoro-Kuwana Fault during the Holocene.
