柳ケ瀬断層の最新活動

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書誌事項

タイトル別名
  • Last Faulting of the Yanagase Fault Based on Trenching Studies in Yogo Town, Central Japan
  • 柳ヶ瀬断層の最新活動--滋賀県余呉町椿坂峠におけるトレンチ発掘調査
  • ヤナガセ ダンソウ ノ サイシン カツドウ シガケン ヨ ゴチョウ ツバキサカトウゲ ニ オケル トレンチ ハックツ チョウサ
  • ―滋賀県余呉町椿坂峠におけるトレンチ発掘調査―

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抄録

The Yanagase fault is a left-lateral strike-slip active fault trending N-S to NNW-SSE in northern Shiga Prefecture and Fukui Prefecture. We excavated seven trenches, namely N, Ma, Mb, Mc, Md, Ms and S trenches, near the Tsubakizaka Pass along the fault in order to know the timing of recent faulting events. An almost vertical fault plane is clearly observed on the walls of the Md, Ms and S trenches. The fault cuts the AT tephra layer (about 25ka) and is covered by the K-Ah tephra layer (about 7ka) in the S trench. According to the radiocarbon dates of samples from the trench walls, the timing of the latest faulting of the northern part of the fault is estimated to be 7000 to 7200 years ago. The previous trench study on this fault at about 4km south of this trench site, indicated that the fault ruptured about 600 years ago. This difference in the timing of the last faulting event may mean that the Yanagase fault is devided into at least two segments.

収録刊行物

  • 地震　第２輯

    地震　第２輯 51 (3), 281-289, 1998

    公益社団法人 日本地震学会

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