Wave‐Equation Dispersion Inversion of Guided P Waves in a Waveguide of Arbitrary Geometry
We present a novel P‐wave velocity inversion scheme which is based on the wave‐equation guided P waves dispersion curves inversion. Its misfit function is the squared summation of differences between the predicted and observed dispersion curves of guided P waves, and the inverted result is a high‐resolution estimate of the near‐surface P‐velocity model. We denoted this procedure as wave‐equation guided P waves dispersion inversion (WDG), which is valid for near‐surface waveguides with irregular layers and does not require a high‐frequency approximation. It is more robust and mitigating cycle‐skipping in full waveform inversion (FWI) and can sometimes provide velocity models with higher resolution than wave‐equation traveltime tomography (WT). Both the synthetic‐ and field‐data results demonstrate that WDG for guided P waves can accurately invert the P‐velocity distribution of complex laterally heterogeneous medium in near surface.
Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1029/2018JB016127
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