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Early-arrival waveform inversion for near-surface velocity and anisotropic parameters: inversion of synthetic data

Xukai Shen


I test different inversion parametrizations of vertical velocity and anisotropic parameter $ \epsilon $ . A model space parametrized by the squares of vertical and horizontal velocity results in vertical velocity and $ \epsilon $ updates with opposite signs. On the other hand, a model space parametrized by the logarithm of the vertical velocity squared and $ \epsilon $ has more reasonable updates, as well as better data matching. However, ambiguity does exist in the inversion results between vertical velocity and $ \epsilon $ . I clearly demonstrate these findings using a synthetic example.