2-D and 3-D Subsurface Density Structure in the Northern Part of the Itoigawa-Shizuoka Tectonic Line Derived by Gravity Surveying.

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  • Okubo Shuhei
    Earthquake Research Institute, The University of Tokyo
  • Ikeda Yasutaka
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Kumamoto Takashi
    Department of Geography, Graduate School of Science, Tokyo Metropolitan University
  • Seta Gaku
    Earthquake Research Institute, The University of Tokyo
  • Matsuta Nobuhisa
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Chiba Hiroaki
    Department of Geology, Graduate School of Science, Tohoku, University
  • Arai Yoshimasa
    Department of Geology, Graduate School of Science, Tohoku, University

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Other Title
  • 重力異常に基づく糸魚川‐静岡構造線北部の構造解析
  • ジュウリョク イジョウ ニ モトヅク イトイガワ シズオカ コウゾウセン ホクブ ノ コウゾウ カイセキ

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Abstract

We carried out gravity surveying along a profile of the reflection seismological prospecting in the northern part of the Itoigawa-Shizuoka Tectonic Line (ISTL). Combined use of gravity and seismic data enables us to construct a 2-D subsurface density model. We also pre sent a 3-D model which is consistent with the previous works on gravity and reflection/refraction prospecting. Both 2-D and 3-D models show a reverse fault structure dipping toward the east. We do not find any thrusting structure dipping toward the west as implied from the up lifting of the Hida range.

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