表面波インバージョンによる上部マントル内部の推定 : 幾何学的波線から有限幅波線への発展
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概要
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A variety of methods of surface wave inversion, which enables us to investigate detailed images of the upper mantle on a regional scale, are reviewed. The study of surface wave tomography beginning in the 1980's has brought us with a significant jump in our understanding of the Earth's interior, particularly the upper mantle. Most of the studies of surface wave tomography have been based upon a geometrical ray theory, working with either dispersion curves or waveforms of surface waves. Such a simple representation of surface wave propagation has allowed us to treat a greater number of data sets, which are indispensable for obtaining high resolution tomography models. However, the ray theory, which is relying upon the high-frequency approximation, is no longer validwhen the scale-length of heterogeneity is comparable to the wavelength of waves to be considered.The effects of finite frequency are particularly important for the higher-frequency surface waves,which mainly sample the crust and uppermost mantle where very strong lateral heterogeneity is likely to exist. Recent development of the 3-D sensitivity kernels allows us to treat the effects of finitefrequency in the tomographic inversions. The use of such finite frequency theory will further advance the methods of surface wave tomography.
- 日本地震学会の論文
- 2005-02-20
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