書誌事項
- タイトル別名
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- Reexamination of fault geomorphology and slip rates along the Chino fault in the middle Itoigawa-Shizuoka Tectonic Line Active Fault System, central Japan
- 糸魚川-静岡構造線活断層系中部,茅野断層(茅野市坂室)の変動地形の再検討
- イトイガワ-シズオカ コウゾウセンカツダンソウケイ チュウブ,チノ ダンソウ(チノシザカシツ)ノ ヘンドウ チケイ ノ サイケントウ
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説明
The Chino fault consists a section of the Middle Itoigawa-Shizuoka tectonic line active fault system (ISTL), central Japan. The Chino fault is characterized by a high average slip rate reaching 10 mm/yr., which is one of the highest slip rates reported from active faults onshore Japan. Along the linear fault trace, channels and terrace risers are systematically offset by left-lateral slip and fault scarps by vertical component is clear on Late Quaternary terrace surfaces. Intensive studies on fault topography were conducted at Sakamuro. We carried out 1) air-photo interpretation, 2) LiDAR DEM analyses, 3) geomorphic mapping of terraces and faults, 4) pit excavation for stratigraphy and chronology, 5) measurement of strike-slip and dip-slip offsets, and 6) estimation of recurrence intervals and slip-per-event. The fluvial terraces are classified into eight surfaces from H to L3 in descending order, based on terrace deposits, overlaying tephra layers and radiocarbon ages (H: older than 120 ka, M1: 100 ka, M2a: 60 ka, M2b: 40 ka, L1a: 30 ka, L1b: 10 ka, L2: 5 ka, L3: 1-2 ka). Through these analyses, an average left-lateral slip rate of the fault is estimated to be 8.5 to 14.8 mm/yr. The last faulting event is inferred to have occurred after 1,000-2,000 yr B.P. when the L3 surface was formed. In addition, the left-lateral and vertical slip amounts per event are estimate as at 4.5 to 5 m and 2 m, respectively. The average recurrence interval calculated from the slip rate and slip-per-event is about 1,700-5,000 years.
収録刊行物
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- 活断層研究
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活断層研究 2012 (37), 17-28, 2012
一般社団法人 日本活断層学会
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詳細情報 詳細情報について
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- CRID
- 1390282680732733696
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- NII論文ID
- 130005138477
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- NII書誌ID
- AN10157356
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- ISSN
- 21865337
- 09181024
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- NDL書誌ID
- 024089254
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可