| 講演要旨(和文) | | 重力探査では，重力異常データの逆解析によって地下の密度構造モデルを推定している．成層構造に基づく3次元密度構造の逆解析には，従来，堆積層と基盤からなる均質2層構造モデルが用いられてきた．しかしながら，この従来法の難点のひとつは，一般に堆積層は均質層ではなく，密度が異なる複数の層からなることにある．密度が異なる複数の層をひとつの均質層とみなすと，従来法によって推定された密度構造モデルに誤差を生じることがある．そこで，任意の層数からなる多層構造モデルを扱うことができるように拡張した逆解析法を提案する．この方法の特徴のひとつは，屈折法弾性波探査における萩原の方法のように，層境界面を上から順次求めていくことにある． |
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| | 講演要旨(英文) | | In the gravity survey, subsurface density structural models are estimated by the inversion of gravity anomaly data. The inversion method of three-dimensional density structure based on a layered structure has been conventionally used a structural model consisting of two homogeneous layers, such as a sedimentary layer and a basement. However, one drawback of this conventional method is that the sedimentary layer is normally consisting of not a homogeneous layer, but plural layers varying in density. Considering plural layers varying in density as a homogeneous layer, the conventional method can result in errors in the estimated structural model. Therefore this paper proposes an expanded inversion method that can deal with multi-layered structural models consisting of arbitrary number of layers. One feature of this method, like Hagiwara's method in the seismic refraction method, is that layer boundaries are determined in order from the top. |
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