中央構造線活断層系・畑野断層の最新活動時期と変位量 Timing and Displacement of the Most Recent Surface Faulting on the Hatano Fault of the Median Tectonic Line Active Fault System, Southwest Japan

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著者

    • 堤 浩之 TSUTSUMI Hiroyuki
    • 京都大学大学院理学研究科地球物理学教室 Department of Geophysics, Graduate School of Science, Kyoto University
    • 遠田 晋次 TODA Shinji
    • 産業技術総合研究所活断層研究センター Active Fault Research Center, National Institute of Advanced Industrial Science and Technology

抄録

The Median Tectonic Line active fault system (MTL), with an average slip rate as high as 5-10 mm/yr, is one of the most active inland faults in Japan. However, the long-term seismic risk of the MTL has been poorly known, because of insufficient paleoseismological data, especially timing and displacement associated with the most recent surface faulting.<BR>We carried out a trench excavation survey across the Hatano fault in Doi town, Ehime Prefecture, and were able to precisely determine the timing of the latest faulting event. The survey site is located between range-facing fault scarps level 0.8 m high on an alluvial fan. We first excavated two trenches across the fault to precisely locate fault traces. Faults cutting Holocene sediment were exposed on both walls of each trench. The sense of apparent displacement across the fault zone is down to the south, which is consistent with fault scarps around the trench site. Then we excavated two trenches parallel to the fault zone to expose stratigraphic evidence of horizontal displacement associated with past earthquakes.<BR>The sediment exposed on the trench walls contains evidence of two faulting events in the past 3500 years B.P. The most recent surface faulting along the Hatano fault occurred between 1520 cal A.D and 1660 cal A.D. This is the first paleoseismological data that precisely constrain the timing of the most recent faulting event of the MTL. We have estimated 2.5 ± 0.5 m right-lateral displacement and 0.3-0.5 m vertical displacement up to the north during the most recent faulting event based on an offset of paleo-channel deposit.

収録刊行物

  • 地學雜誌

    地學雜誌 112(4), 531-543, 2003-08-25

    公益社団法人 東京地学協会

参考文献:  11件中 1-11件 を表示

被引用文献:  3件中 1-3件 を表示

各種コード

  • NII論文ID(NAID)
    10013949648
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    6689870
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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