1887

Abstract

Summary

We inverted seismic field data for a continuous, laterally invariant P-wave velocity profile. Instead of the usual approach that involves horizontal layers with piecewise constant densities and velocities, we consider models of one or two layers with a constant gradient of the squared slowness above a homogeneous halfspace.

With a single layer above a halfspace, there are three parameters. With two layers, there are five. We solve the inverse problem by a direct grid search over a wide range of parameters. The results were compared to that of a piecewise-constant multi-layer inversion result. In the single-layer case, either the shallow or the deeper part of the model would match the multi-layer case, depending on which modes of the surface waves were selected. With two layers, a considerably better agreement is obtained over a larger depth range. Our method is limited to cases with a small Vs/Vp-ratio but has only 5 parameters. It could be a useful alternative to piecewise-constant multi-layer inversion, in particular if continuous P-velocity profiles are sought. These are sometimes better suited as a starting model for full waveform inversion than models with many discontinuities.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201413796
2015-09-06
2019-12-06
Loading full text...

Full text loading...

References

  1. Brekhovskikh, L.
    [1980] Waves in layered media. Applied mathematics and mechanics, Academic Press, ISBN 9780121305604.
    [Google Scholar]
  2. Maraschini, M., Ernst, F., Foti, S. and Socco, L.
    [2010] A new misfit function for multimodal inversion of surface waves. Geophysics, 75(4), G31–43, doi:10.1190/1.3436539.
    https://doi.org/10.1190/1.3436539 [Google Scholar]
  3. Ponomarenko, A.V., Kashtan, B.M., Troyan, V.N. and Mulder, W.A.
    [2013a] Estimation of a P-wave velocity profile from elastic real data based on surface wave inversion. Near Surface Geoscience 2013 — 19th European Meeting of Environmental and Engineering Geophysics, Bochum, Germany, 9–11 September 2013.
    [Google Scholar]
  4. [2013b] Surface wave inversion for a P-wave profile via estimation of the squared slowness gradient. 75th EAGE Conference & Exhibition, Extended Abstracts, London, UK, doi:10.3997/2214‑4609.20130945.
    https://doi.org/10.3997/2214-4609.20130945 [Google Scholar]
  5. Socco, L., Foti, S. and Boiero, D.
    [2010] Surface-wave analysis for building near-surface velocity models — established approaches and new perspectives. Geophysics, 75(5), 75A83–102, doi:10.1190/1.3479491.
    https://doi.org/10.1190/1.3479491 [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201413796
Loading
/content/papers/10.3997/2214-4609.201413796
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error