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Caveats in Multi-modal Inversion of Seismic Surface Wavefields

机译：地震地表波场多模态反演的注意事项

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We consider several examples demonstrating that the formal modal representation of surface wavefields often does not describe adequately observable wave parameters, such as the phase and group velocity dispersion of higher modes. The main reason for this is the existence in the medium of several waveguides or weakly coupled wavefields in the same waveguide. In such cases the separation of neighboring higher modes may be impossible, and observed dispersion curves may significantly differ from the ones predicted by the theory. From the example related to the studies of the crustal and upper mantle structure we found that the difficulty in the separation of first and second crustal higher modes can be overcome by applying a special inversion procedure. This procedure ignores the existence of a low velocity layer in the upper mantle when fitting the observable higher-mode dispersion curve to the one predicted by the model.
机译：我们考虑几个例子，这些例子表明表面波场的形式模态表示通常不能描述可观察到的波参数，例如高模的相位和群速度色散。主要原因是在同一波导中存在多个波导或弱耦合波场。在这种情况下，可能无法分离相邻的较高模，并且观察到的色散曲线可能与理论预测的明显不同。从有关地壳和上地幔结构研究的例子中，我们发现可以通过应用特殊的反演程序来克服分离第一和第二地壳高模的困难。当将可观测的高模色散曲线拟合到模型预测的曲线时，此过程将忽略上地幔中低速层的存在。

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