Paleoearthquakes recorded by deformed fluvial deposits on the Boshima fault, Arima-Takatsuki fault zone, southwest Japan

DOI
  • Tani Miyuki
    Graduate School of Science, Kyoto University
  • Komatsubara Taku
    Institute of Geoscience, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology
  • Okada Atsumasa
    Graduate School of Science, Kyoto University
  • Nohara Tsuyoshi
    Tono Geoscience Center, Japan Nuclear Cycle Development Institute

Bibliographic Information

Other Title
  • 有馬-高槻断層帯・坊島断層の断層露頭

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Description

The Arima-Takatsuki fault zone (ATFZ) consists of active intraplate strike-slip faults that extend for about 42 kilometers in southwest Japan. The ATFZ is thought to have ruptured in a historic earthquake in A. D.1596. A trench opened for this study across the right-lateral Boshima fault reveals evidence for Holocene seismic events. We surveyed this trench wall excavated along trend with late Pleistocene to Holocene fault scarps and offsets of stream channel walls. A fault-perpendicular trench exposes mainly coarse-grained fluvial deposits, as well as liquefied silt, that define the main fault zone. Analysis of stratigraphic relations and radiocarbon datings in Holocene fluvial deposits indicate at least four events. Among them period of the most recent earthquake postdates the fifth to sixth century humic soil. Although the uppermost section of strata is artificially disturbed, our result indicates the faulting event along the ATFZ occurred in the historical time.

Journal

  • Active Fault Research

    Active Fault Research 2004 (24), 167-173, 2004

    Japanese Society for Active Fault Studies

Keywords

Details 詳細情報について

  • CRID
    1390282679405426432
  • NII Article ID
    130003355460
  • DOI
    10.11462/afr1985.2004.24_167
  • ISSN
    09181024
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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