Tectonics and geomorphologic developments since the middle Pleistocene in and around the Kinki Triangle, western Japan

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Sedimentation processes of the Mikata and Kumihama Lowlands, the Fukuchiyama and Hikami Basins, and the Himeji Plain around the northwestern edge of the Kinki Triangle, western Japan, are clarified using the middle Pleistocene marker tephra layers erupted from Daisen Volcano and volcanoes of the Kyushu Island, especially focusing on the starting ages of the sedimentation and the mean sedimentation rates until now. As the results, the right-lateral faulting along the northwestern edge of the Kinki Triangle has intensified in between 0.5 and 1.0 Ma and caused the northwestern tilting of the faulted blocks northwest of the edge relating to the slow subsidence of such lowlands and basins. It also suggests the change in mode of tectonic movements at the northernmost part of the triangle around 150-200 ka.