Graben Structures along the Arima-Takatsuki Tectonic Line Inferred from Seismic Reflection Sections

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  • TODA Shigeru
    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University
  • KAWASAKI Shinji
    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University
  • TAKEMURA Keiji
    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University
  • OKADA Atsumasa
    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University

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  • 反射法地震探査の断面に見られる有馬-高槻構造線に沿う地溝帯
  • ハンシャホウ ジシン タンサ ノ ダンメン ニ ミラレル アリマ タカツキ コ

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Abstract

It is known that graben structure-the Onohara-Ai Fault system-exists sub-parallel to the Arima-Takatsuki Tectonic Line (ATL) in the northwestern part of the Kinki Triangle. In contrast, the ATL consists of east-west trending right lateral faults. Two seismic reflection surveys with a total length of 8.5km were carried out along the Yodo and Ina Rivers which cross the ATL. The results from these surveys revealed the subsurface structure along the ATL and are as follows:<br>1) Four seismic units were established in this area.<br>2) Some graben structures exist on the southern side of the ATL.<br>Based on the azimuthal direction of the maximum horizontal compressive stress, the strike direction of the ATL, the focal mechanisms of aftershocks of the 1995 Hyogoken-Nanbu Earthquake, and the orientation of graben structures, we interpret the ATL as an oblique fault connecting the northern Hanaore Fault and the southern Rokko Faults, and suggest that the stress field has been released through strike-slip duplexes and a pull apart structure on the northern and southern portion of the ATL, respectively.

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