| 講演要旨(和文) | | 地震波は不均質媒質を伝播するとき波形を変化させる.波長が不均質サイズに比べ十分に長い場合,不均質媒質は等価均質媒質としてふるまうが,不均質サイズが大きくなると,地震波は散乱され媒質は強散乱媒質となる.地震波探査では,多くの場合,弱い散乱しか考慮しないのが,実際には強い散乱の場合もあるので,両者の境界を定量的に把握することは重要である.これまでの室内モデル実験の結果をもとに,両者の境界の位置を把握したので,その結果について報告する. |
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| | 講演要旨(英文) | | Seismic waveforms fluctuate when propagating through random heterogeneous media. It is important to determine the boundary between the equivalent homogeneous medium and the strong scattering medium because scattered waves from the small-scale random heterogeneity give distortions to seismic waveforms. Recent scale-model experiments in laboratory have provided important information about the boundary between the equivalent homogeneous medium and the strong scattering medium. The location of the boundary has been determined by interpreting laboratory experiments. The meaning of locating the boundary is discussed on the basis of the two wavelength-normalized scale-invariant variables: the correlation length of random heterogeneity and the travel distance of seismic wave. |
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