| 講演要旨(和文) | | 近年，3次元地質モデルの必要性が高まっており，3次元地質モデルを作成することができる手段として3次元物理探査の研究が盛んに行われている．3次元物理探査技術の開発の一環として「3D-HDトモグラフィ」が提案されており，その有用性は既に実証されている．本報告では，この3D-HDトモグラフィの特徴を活かした探査技術を「フレックス配置による3次元弾性波探査」と呼称し，その適用性を現地実験により検討した．現地実験は，稠密なメッシュ状に配置した受振点を使用してデータを取得し，適用性の検討として，全ての受振データを用いた3次元弾性波探査解析結果と，一部の受振データのみを用いたフレックス配置による3次元弾性波探査結果とを比較した．その結果，フレックス配置による3次元弾性波探査は，稠密な測線配置にした3次元弾性波探査とほぼ同等の結果が得られることを確認した． |
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| | 講演要旨(英文) | | In recent years, three-dimensional (3D) geological models have been gaining importance in various fields. 3D geophysical surveys, which provide direct geological information, are being actively studied as they can contribute to the creation of geological models. As part of the development of 3D geophysical techniques, "3D-HD tomography" has been proposed and its usefulness has already been demonstrated. In this report, we propose a "3D seismic refraction survey with flexible geometry" that utilizes the features of 3D-HD tomography and investigate its applicability through the field experiment. In the field experiment, seismic data were acquired using receivers arranged in a dense mesh, and the results of 3D travel-time inversion using all the data were compared with the results with flexible geometry using some of the data. The results show that the inversion results with flexible geometry are as useful as it with dense mesh geometry. |
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