Debris flow deposits and minor folds in rhythmical lacustrine sediments. Implications for cyclic debris flows and inland earthquakes.

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  • 縞状堆積物に認められる土石流堆積物と層内しゅう曲　土石流発生と内陸地震の周期を探る
  • シマジョウ タイセキブツ ニ ミトメラレル ドセキリュウ タイセキブツ ト ソ
  • Implications for Cyclic Debris Flows and Inland Earthquakes
  • 土石流発生と内陸地震の周期を探る

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Four debris flow deposits and many intraformational folds were found in the late Pleistocene Takigoshi lacustrine sediments near the Ontake volcano, central Japan. The debris flow deposits have been regarded to be supplied from a large slope failure around the Kamikurosawa valley, which is identified in the present study. The size of the failure is estimated to be comparable with the Denjokuzure, which was caused by the Naganokenseibu earthquake on September 14th, 1984. Detailed stratigraphic study of the Takigoshi sediments revealed that debris flows took place three times in 500-2500 years. It is suggested that periodic inland earthquakes generated the debris flows, because a large fraction of historical large-scale debris flows was induced by them and active faults densely occur in central Japan. A brief description of other lacustrine sediments suggests that debris flow deposits and intraformational folds are ubiquitous. It is pointed out that a detailed stratigraphic study of rhythmical sediments provides a significant method for estimating recurrence interval of inland earthquakes.

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