


 Earlyarrival waveform inversion for nearsurface velocity and anisotropic parameters: inversion of synthetic data  

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In a separate paper (Shen, 2012), I showed that in the case of earlyarrival waveform inversion, changes in vertical velocity and
affect data kinematics much more than
changes do. Since
has a minimal effect on data kinematics, I proposed joint inversion for vertical velocity and
, while holding
fixed. For such inversion, I proposed three parametrizations for joint inversion of vertical velocity and anisotropic parameter
. Naive parametrization is not suitable for joint inversion, since it results in no updates to
. Velocity parametrization and logarithmic slowness parametrization both seem more suitable.
In this paper, I compare the inversion results of each parametrization using two synthetic examples, one laterally invariant verticalgradient background model with Gaussian anomalies, and one that is part of the BP 2002 velocity model with anisotropic parameters. First I will describe the equation used and the model parametrization. Then I will compare various inversion results using the two synthetic examples.



 Earlyarrival waveform inversion for nearsurface velocity and anisotropic parameters: inversion of synthetic data  

Next: Theory
Up: Shen : VTI FWI
Previous: Shen : VTI FWI
20120510