Depth of investigation for multi-parameters inversions

G. Fiandaca, A. V. Christiansen, E. Auken

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

23 Citations (Scopus)

Abstract

We have developed a new robust concept for the calculation of the depth of investigation (DOI) for inversion problems described by several intrinsic parameters, like the spectral inversion of time-domain induced polarization data or the inversion of full-decay Nuclear Magnetic Resonance soundings. A calculation of the DOI is crucial for interpreting the geophysical models, as the validity of the model varies considerably with data noise and parameter distribution. Without the DOI estimate, it is difficult to judge when the information in the model is data-driven or is strongly dependent on the constraints and/or on the starting value. The proposed method is based on an approximated covariance analysis applied to the model output from the inversion while considering the data standard deviations. Furthermore, the crosscorrelations between intrinsic parameters are taken into account in the computations, which is crucial when strong cross-correlations are expected. The new DOI estimate is described in detail and compared to the full covariance analysis on the model parameters using 2D spectral inversion of time-domain induced polarization data as an example. The DOI presented here behaves as anticipated on a synthetic model and is suggested as a general approach for model-spaces with more than one physical parameter.

Original languageEnglish
Title of host publicationNear Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics
PublisherEuropean Association of Geoscientists and Engineers
Pages666-670
Number of pages5
ISBN (Electronic)9781510814127
DOIs
Publication statusPublished - 2015
Event21st European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2015 - Turin, Italy
Duration: 6 Sep 201510 Sep 2015

Publication series

NameNear Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics

Conference

Conference21st European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2015
Country/TerritoryItaly
CityTurin
Period6/09/1510/09/15

Programme Area

  • Programme Area 2: Water Resources

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