Latest Rupture Event of the Mino Fault, the Median Tectonic Line Active Fault System, in East Shikoku, Southwest Japan.
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- MORINO Michio
- OYO Corporation
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- OKADA Atsumasa
- Department of Geophysics, Kyoto University
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- NAKATA Takashi
- Department of Geography, Hiroshima University
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- MATSUNAMI Koji
- Disaster Prevention Research Institute, Kyoto University
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- KUSAKA Masayoshi
- Faculty of Literature, Tokushima Bunri University
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- MURATA Akihiro
- Faculty of Integrated Arts and Sciences, University of Tokushima
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- MIZUNO Kiyohide
- Active Fault Research Center, AIST-GSJ
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- NOUMI Tadatoshi
- OYO Corporation
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- TANINOMIYA Emi
- OYO Corporation
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- IKEDA Saori
- OYO Corporation
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- YOSHIDA Takafumi
- OYO Corporation
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- HARA Ikuo
- OYO Corporation
Bibliographic Information
- Other Title
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- 中央構造線活断層系三野断層の最新活動時期
- チュウオウ コウゾウセンカツダンソウケイ ミノダンソウ ノ サイシン カツドウ ジキ
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Abstract
The Median Tectonic Line (MTL) active fault system is one of the most active intraplate faults in Japan. The fault system, which is more than 300 km long, is a right-lateral strikeslip fault with an average slip rate of 5-10 mm/y in east Shikoku. The 13.5-km-long Mino fault of the MTL active fault system is located at the western part of Tokushima Prefecture in east Shikoku. We carried out trench excavation surveys of the Mino fault at Ueno in Mino Town and Ikenoura in Mima Town. Both sites are situated at fault depressions formed on the middle and lower terrace surfaces by the activity of the Mino fault. Fault depression deposits consist of younger and finer grained layers with abundant 14C dating samples. We inferred the dates of faulting events from upward fault terminations on the trench walls.<BR>At Ueno, it is recognized that the latest rupture event occurred between 1, 295-1, 390 cal A.D. and 1, 660-1, 950 cal A.D. (190 ± 50 years B.P.). Multiple faulting events are also suggested after K-Ah ash fall (about 5, 200 B.C.), because the ash layer steepens to near vertical. At Ikenoura, the latest rupture event is estimated to have occurred after 1, 525-1, 660 cal A.D.<BR>Taking account of the previous reports on the eastern extension at Chichio and Zunden faults, we conclude that the MTL active fault system in east Shikoku ruptured in the 16th century A.D. or later. The liquefactions, which occurred between the latter half of the 16th century A.D. and the beginning of the 17th century A.D., are recognized at archaeological sites at Maruyama and Ogaki in the western part of Tokushima Prefecture. These sites are located immediately south of the Mino fault and the Ikeda fault to the west. This fact suggests that the liquefactions were caused by faulting of the MTL active fault system in east Shikoku.
Journal
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- Journal of Geography (Chigaku Zasshi)
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Journal of Geography (Chigaku Zasshi) 111 (5), 661-683, 2002
Tokyo Geographical Society
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Details 詳細情報について
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- CRID
- 1390001204230956416
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- NII Article ID
- 110000380006
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- NII Book ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL BIB ID
- 6329138
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed