Inanisotropy full waveform inversion, the pseudo-acoustic approximation is widely used to reduce the computation cost. However, artefacts and inaccurate predictions of amplitudes by the pseudo-acoustic approximation often result in slow convergence in the full waveform inversion iterations and inaccurate tomograms. To solve this problem, multiscale phase inversion methodology is extended to vertical transverse isotropic media. In multiscale phase inversion, the amplitude spectra of the predicted data are replaced by those of the recorded data to mitigate the amplitude mismatch problem. Moreover, multiscale phase inversion tends to avoid the local minimum problem of full waveform inversion by temporally integrating the traces several times. Numerical tests on synthetic data and field data demonstrate the superiority of this method compared to conventional multiscale full waveform inversion for vertical transverse isotropic media.

中文翻译：

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垂直横向各向同性介质的多尺度反相

非各向异性全波形反演，伪声近似被广泛用于降低计算成本。然而，伪声近似对幅度的伪影和不准确预测通常会导致全波形反演迭代收敛缓慢和断层图像不准确。为了解决这个问题，多尺度相位反演方法被扩展到垂直横向各向同性介质。在多尺度相位反演中，预测数据的幅度谱被记录数据的幅度谱代替，以减轻幅度失配问题。此外，多尺度相位反演倾向于通过对轨迹进行多次时间积分来避免全波形反演的局部最小值问题。