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A seismic reflection exploration was conducted in the eastern part of the Arima-Takatsuki Tectonic Line (ATL), Kinki district, central Japan. A survey line with 2700m length was spread across the extension of the ATL that strikes from west to east on the northern border of the Osaka plain. The main aim of this survey is to investigate subsurface structure up to the depth of 1km, which possibly reveals buried faults along the ATL. A weight-dropping type wave generator was used as a source apparatus. Through data processing by the CMP profiling method, following results were obtained: (1) The depth of the basement rock is about 150m near the Otokoyama hill (northern section) and about 350m on the Osaka plain side (southern section). There is a large-scale buried fault zone below the survey line. The main fault along the ATL seems to extend eastward to the southern part of the Otokoyama hill beyond the survey location. (2) Two flexures are discerned in this buried fault zone and they form a graben structure. This structure probably is the topographic expression of ATL (see text for detail). (3) The movement producing the southern flexure is presumed to have begun after sedimentation of the 50m depth layer in the Osaka plain, based on parallel dipping of each layer at the depth. (4) The rate of vertical movement mentioned above is estimated to be equal to or greater than those of B class active faults, based on the difference of the basement depths across the southern fault.

Seismic Reflection Exploration in the Eastern Part of the Arima-Takatsuki Tectonic Line, Kinki District, Central Japan