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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Banana Doughnut theory ： ウィキペディア英語版 Banana Doughnut theory The Banana Doughnut theory〔Dahlen, F.A., Hung, S.-H. and Nolet, G., 2000. ("Fréchet kernels for finite-frequency travel times - I. Theory" ), ''Geophys. J. Int.'', 141, pp. 157-174.〕〔van der Hilst, R.D. and M.V. de Hoop, 2005. ("Banana-doughnut kernels and mantle tomography," ) ''Geophys. J. Int.'', 163, pp. 956-961.〕 also sometimes known as Born-Fréchet kernel theory, is a model in seismic tomography that describes the shape of the Fresnel zone along the entire ray path. This theory suggests that the area that influences the ray velocity is the surrounding material and not the infinitesimally small ray path. This surrounding material forms a tube enclosing the ray, but does not incorporate the ray path itself. The name was coined by Princeton University postdoc Henk Marquering.〔See discussion on the origin of the theory and debates about this approach (here. ).〕 This theory gets the name "banana" because the tube of influence along the entire ray path from source to receiver is an arc resembling the fruit. The "doughnut" part of the name comes from the ring shape of the cross-section. The ray path is a hollow banana, or a banana-shaped doughnut.〔An image of the model can be found (here. )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Banana Doughnut theory」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.