Holocene faulting history of the Iyo Fault, part of the Median Tectonic Line active fault system in northwest Shikoku, southwest Japan

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  • Ikeda Michiharu
    Department of Civil Engineering, Shikoku Research Institute Incorporation
  • Goto Hideaki
    Department of Geography, Graduate School of Letters, Hiroshima University
  • Tsutsumi Hiroyuki
    Department of Geophysics, Graduate School of Science, Kyoto University
  • Tsuyuguchi Koji
    Department of Geotechnical Engineering, Yonden Consultants Company Incorporation
  • Ohno Yuki
    Department of Civil and Architectural Engineering, Shikoku Electric Power Company Incorporation
  • Nishizaka Naoki
    Department of Civil and Architectural Engineering, Shikoku Electric Power Company Incorporation
  • Kobayashi Shuji
    Department of Civil Engineering, Shikoku Research Institute Incorporation

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Other Title
  • 四国北西部の中央構造線活断層系伊予断層の完新世活動履歴
  • シコク ホクセイブ ノ チュウオウ コウゾウセンカツダンソウケイ イヨ ダンソウ ノ カンシン セイ カツドウ リレキ

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Abstract

The Median Tectonic Line active fault system (MTLAFS) is one of the longest active faults in Japan, with a length of 400 km, and extends from the Kii Peninsula to Kyushu. Previous studies have obtained a large amount of data on recent surface-faulting events along the MTLAFS; however, the quality and quantity of this data is spatially and temporally inconsistent. More precise data are required to better assess faulting behavior and the magnitude of inland earthquakes along the MTLAFS. To this end, we excavated trenches across the Iyo Fault, which is on the western section of the MTLAFS, and obtained new geological information on three recent faulting events. The most recent faulting event occurred after AD 1650, the penultimate event occurred between 2865 BC and 845 BC, and an earlier event ooccurred between 23440 yrs BP and 4850 BC. The interval between the two most recent movements of the Iyo Fault was more than 2000 yr. We compared paleoseismological data from the past 10000 yrs with data from the Hongu Fault, which runs parallel to the Iyo Fault, and found that the Hongu and Iyo faults may have ruptured together, and at the same time as the penultimate event on the Iyo Fault.

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