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Nonlinear regularization techniques for seismic tomography

Publication ,  Journal Article
Loris, I; Douma, H; Nolet, G; Daubechies, I; Regone, C
Published in: Journal of Computational Physics
February 1, 2010

The effects of several nonlinear regularization techniques are discussed in the framework of 3D seismic tomography. Traditional, linear, ℓ2 penalties are compared to so-called sparsity promoting ℓ1 and ℓ0 penalties, and a total variation penalty. Which of these algorithms is judged optimal depends on the specific requirements of the scientific experiment. If the correct reproduction of model amplitudes is important, classical damping towards a smooth model using an ℓ2 norm works almost as well as minimizing the total variation but is much more efficient. If gradients (edges of anomalies) should be resolved with a minimum of distortion, we prefer ℓ1 damping of Daubechies-4 wavelet coefficients. It has the additional advantage of yielding a noiseless reconstruction, contrary to simple ℓ2 minimization ('Tikhonov regularization') which should be avoided. In some of our examples, the ℓ0 method produced notable artifacts. In addition we show how nonlinear ℓ1 methods for finding sparse models can be competitive in speed with the widely used ℓ2 methods, certainly under noisy conditions, so that there is no need to shun ℓ1 penalizations. © 2009 Elsevier Inc. All rights reserved.

Duke Scholars

Published In

Journal of Computational Physics

DOI

EISSN

1090-2716

ISSN

0021-9991

Publication Date

February 1, 2010

Volume

229

Issue

3

Start / End Page

890 / 905

Related Subject Headings

  • Applied Mathematics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Loris, I., Douma, H., Nolet, G., Daubechies, I., & Regone, C. (2010). Nonlinear regularization techniques for seismic tomography. Journal of Computational Physics, 229(3), 890–905. https://doi.org/10.1016/j.jcp.2009.10.020
Loris, I., H. Douma, G. Nolet, I. Daubechies, and C. Regone. “Nonlinear regularization techniques for seismic tomography.” Journal of Computational Physics 229, no. 3 (February 1, 2010): 890–905. https://doi.org/10.1016/j.jcp.2009.10.020.
Loris I, Douma H, Nolet G, Daubechies I, Regone C. Nonlinear regularization techniques for seismic tomography. Journal of Computational Physics. 2010 Feb 1;229(3):890–905.
Loris, I., et al. “Nonlinear regularization techniques for seismic tomography.” Journal of Computational Physics, vol. 229, no. 3, Feb. 2010, pp. 890–905. Scopus, doi:10.1016/j.jcp.2009.10.020.
Loris I, Douma H, Nolet G, Daubechies I, Regone C. Nonlinear regularization techniques for seismic tomography. Journal of Computational Physics. 2010 Feb 1;229(3):890–905.
Journal cover image

Published In

Journal of Computational Physics

DOI

EISSN

1090-2716

ISSN

0021-9991

Publication Date

February 1, 2010

Volume

229

Issue

3

Start / End Page

890 / 905

Related Subject Headings

  • Applied Mathematics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences