The Eastern Continuation of Sanchu Graben Zone in the Kanto Mountains as Inferred from Gravity Anomaly.

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  • HAGIWARA Yukio
    College of Humanities and Sciences, Nihon University
  • OHKI Yuko
    College of Humanities and Sciences, Nihon University Earthquake Research Insititute, University of Tokyo
  • SHICHI Ryuichi
    School of Science, Nagoya University

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  • 重力異常による関東山地「山中地溝帯」の東方延長部の推定
  • ジュウリョク イジョウ ニ ヨル カントウ サンチ サンチュウ チコウタイ ノ トウホウ エンチョウブ ノ スイテイ

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Abstract

There is no geological evidence of the eastern continuation of the Sanchu Graben Zone (SGZ) except for a local Cretaceous sediment found in the eastern margin of the Kanto Mountains, Central Japan. SGZ and its continuation are presumed to have developed along an axis of the geosynclinal movement. Such an axis can be detected generally as a linear arrangement of local Bouguer gravity anomaly lows. We detected some mutually parallel lineaments in the eastern part of the Kanto Mountains by means of the line-detection method applied to Bouguer anomaly data digitalized with a 500-m grid interval. We conclude that one of them, which runs on the extension of SGZ, may possibly correspond to the eastern continuation of SGZ.

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