1887

Abstract

Summary

Shallow-seismic Rayleigh waves are attractive for geotechnical site investigations. They exhibit a high signal to noise ratio in field data recordings and have a high sensitivity to the S-wave velocity, an important lithological and geotechnical parameter to characterize the very shallow subsurface.

In recent years we studied the applicability of the two-dimensional elastic FWI method using numerous synthetic reconstruction tests and two field data examples. Some important challenges are reported here: (1) the accurate correction of the geometrical spreading, (2) the estimation of the source wavelet, (3) the importance of an-elastic attenuation in the forward simulations.

We found that Important pre-processing steps for the application of 2-D elastic FWI to shallow-seismic field data are the 3D to 2D correction of geometrical spreading and the estimation of a priori Q-values that must be used as a passive medium parameter during the FWI. Furthermore, a source-wavelet correction filter should be applied during the FWI process. Smooth initial models obtained from the analysis of the first arrivals of body waves are important and seem to be sufficient. Our field data examples indicate that FWI is able to resolve lateral variations of S-wave velocities in the very shallow subsurface.

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/content/papers/10.3997/2214-4609.20140532
2014-06-16
2019-12-06
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References

  1. Forbriger, T., Groos, L. and Schäfer, M.
    [submitted] Line-source simulation for shallow-seismic data. Part 1: Theoretical background. Geophys. J. Int.
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    [2013] 2D Full-waveform inversion of shallow seismic Rayleigh waves, Dissertation, Karlsruhe Institute of Technology (KIT).
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    [submitted] Line-source simulation for shallow-seismic data. Part 2: Full-waveform inversion – a 2D case study. Geophys. J. Int.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20140532
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