Isostasy Over Central Honshu, Japan

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  • FURUSE Nobuhiro
    Department of Earth Sciences, Faculty of Science, Kanazawa University
  • KONO Yoshiteru
    Department of Earth Sciences, Faculty of Science, Kanazawa University

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Other Title
  • 本州中部地域のアイソスタシー
  • ホンシュウ チュウブ チイキ ノ アイソスタシー

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Isostasy over central Honshu area is examined by the following four methods.<br>(1) Cross-spectrum technique is applied to analyse a correlation between Bouguer anomalies and topographic relief over the area. Admittance functions derived from this technique for the area show good agreement with those for stable continents.<br>(2) Residual Bouguer anomalies (R. B. A.) over the area are calculated by subtracting a gravity effect of the subducting Philippine sea plate from the observed Bouguer anomalies. The relationship between the R. B. A. and topographic releaf shows a higher correlation than that between the observed Bouguer anomalies and topographic relief.<br>(3) Theoretical Bouguer anomalies calculated by using the admittance functions in central Honshu and topographic relief in stable continents are in good agreement with the R. B. A. over the area.<br>(4) Hydrostatic pressure at the Moho along the Atsumi-Noto explosion seismological observation line satisfies the empilical rule between depth of Moho and pressure at it, which was found in tectonically stable continental and oceanic areas.<br>It is shown from these results that the isostatic state is achieved over central Honshu as it does over stable continents, though the area is tectonically quite active.

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