3D Electromagnetic inversion using conjugate gradients

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Description

In large scale 3D EM inverse problems it may not be possible to directly invert a full least-squares system matrix involving model sensitivity elements. Thus iterative methods must be employed. For the inverse problem, we favor either a linear or non-linear (NL) CG scheme, depending on the application. In a NL CG scheme, the gradient of the objective function is required at each relaxation step along with a univariate line search needed to determine the optimum model update. Solution examples based on both approaches will be presented.

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5 p.

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Newman, G.A. & Alumbaugh, D.L. June 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

In large scale 3D EM inverse problems it may not be possible to directly invert a full least-squares system matrix involving model sensitivity elements. Thus iterative methods must be employed. For the inverse problem, we favor either a linear or non-linear (NL) CG scheme, depending on the application. In a NL CG scheme, the gradient of the objective function is required at each relaxation step along with a univariate line search needed to determine the optimum model update. Solution examples based on both approaches will be presented.

Physical Description

5 p.

Notes

OSTI as DE97006369

Source

  • IGARSS 97: international geoscience and remote sensing symposium, Singapore (Singapore), 3-8 Aug 1997

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  • Other: DE97006369
  • Report No.: SAND--97-1296C
  • Report No.: CONF-970847--2
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 501488
  • Archival Resource Key: ark:/67531/metadc691881

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Creation Date

  • June 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 4, 2015, 9:32 p.m.

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Newman, G.A. & Alumbaugh, D.L. 3D Electromagnetic inversion using conjugate gradients, article, June 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc691881/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.