A Reconsideration of the Activity of the Arakawa Fault Deduced from the Longitudinal Profiles of Late Quaternary Terraces in the Musashino and Omiya Uplands

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  • 武蔵野台地・大宮台地における第四紀後期段丘面の高度分布から見た荒川断層の活動性についての再検討
  • ムサシノ ダイチ オオミヤ ダイチ ニ オケル ダイ4キ コウキ ダンキュウメン ノ コウド ブンプ カラ ミタ アラカワ ダンソウ ノ カツドウセイ ニ ツイテ ノ サイケントウ

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Abstract

This study discusses the late Quaternary activity of the Arakawa fault, which runs along the Ara-kawa lowlands, between the Musashino and Omiya uplands. The Musashino upland is composed of an alluvial fan. These uplands are tephrostratigraphically and height-distributively divided into the S surface (Shimosueyoshi surface), M1 surface (Narimasu surface), M2 surface (Musashino surface), M3 surface (Nakadai surface), and Tc surface (Tachikawa surface) in descending order. The Omiya upland is correlated with the S and M1 surfaces. The S surface is composed of marine sediment and the M1 surface is mainly underlain by fluvial sand.<br> There is no significant height change in the longitudinal terrace profiles across the Arakawa fault. A comparison of the gradient between the M2 surface and S surface of the Musashino upland shows no accumulative deformation. These results suggest that the Arakawa fault had no activity during the late Quaternary.

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