地質学雑誌
Online ISSN : 1349-9963
Print ISSN : 0016-7630
栃木県・関谷断層のトレンチ調査
宮下 由香里山元 孝広吉岡 敏和寒川 旭宍倉 正展丸山 直樹大石 朗細矢 卓志杉山 雄一
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2001 年 107 巻 11 号 p. 722-725

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The Sekiya fault is an N-S-trending thrust in the northern part of Tochigi Prefecture. We surveyed the detailed geomorphic features of the Sekiya fault and opened three trenches on the northern part of the fault. The trenching survey has revealed that the last rupture event on the Sekiya fault occurred after the fall of the Haruna-Futatsudake-Ikaho Pumice in the 6th century. It is also made clear that a penultimate event occurred between ca. 5 ka and the 6th century.

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