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Seismic reflection survey across the central part of the Arima-Takatsuki tectonic line, Kinki District, central Japan



Seismic reflection survey across the central part of the Arima-Takatsuki tectonic line, Kinki District, central Japan



Nature and Human Activities Bulletin of the Museum of Nature and Human Activities, Hyogo



The subsurface structure in the northern Osaka Plain was revealed by a seismic reflection survey along the Ina River in Kinki District, Central Japan. The sediments were divided into four seismic layers (A to D), and they were compared with the stratigraphic units of the deep drilling cores of OD-5, B1, and B2. The A layer includes the Alluvium, terrace deposits, and the Osaka Group Upper Subgroup. The B, C, and D layers are the Osaka Group Middle Subgroup, the Osaka Group Lower Subgroup, and the underlying basement rocks, respectively. Our survey also revealed the subsurface features of the Arima-Takatsuki Tectonic Line, active faults forming the Hanayashiki and Koyaike grabens, and the Itami fault, confirming the eastern extensions of these faults. Among the four active faults, the subsurface characteristics of the Koyaike graben and the Itami fault differ markedly from their surface expressions. The Koyaike graben is a narrow depression with no clear vertical displacement of the Itami terrace across it, but has dislocated the boundary between the Osaka Group and the basement rocks by approximately 230 m. In contrast, the Itami fault appeared as the flexure of reflectors on the seismic section, although it has clearly displaced the surface and deposits of the terrace. On the basis of these subsurface features and the Quaternary tectonic history of the northern Osaka Plain, we concluded the generation of the Itami fault since the latest Middle Pleistocene in association with the change in dominant faulting mode along the Koyaike graben from vertical to lateral.

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Accession: 019987137

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