Presenting a free, highly flexible inversion code

Anders Vest Christiansen, Esben Auken

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)


Electrical and electromagnetic methods are used widely in the geophysical community, but when it comes to integration of the different data types, it becomes difficult because most off-the-shelf inversion codes are built for one specific data type. We present the, for the scientific community free, inversion code emldinv that handles numerous data types as well as constraints in the model space. Combined inversions of different data types are often very important to resolve parameters that are individually poorly resolved with a given method. The emldinv code developed at the University of Aarhus is free to use for scientific purposes at universities. It does 1D inversions on many different data types: surface DC, borehole DC, borehole DC in cylinder symmetric coordinates, time domain (TEM), frequency domain (FEM), magneto telluric (MT), airborne time domain, airborne frequency domain and surface wave dispersion curves (SWD). In addition it will also do 2D inversion of DC data. Individual inversions of these data types are not unique, but the emldinv code allows for any combination of the data types as either joint inversions or combined inversions. Also the code uses laterally constrained inversion (LCI) to mimic sedimentary and other quasi-layered environments. Finally, a full model parameter sensitivity analysis is calculated for the inversion result regardless of the data type. Thus, using the full flexibility of the code in many cases allows for a detailed description of the subsurface with less uncertainty on the estimated parameters. This paper presents a number of the different uses of the code.

Original languageEnglish
Pages (from-to)1228-1232
Number of pages5
JournalSEG Technical Program Expanded Abstracts
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes


  • Airborne survey
  • Electrical/resistivity
  • Electromagnetic
  • Inversion

Programme Area

  • Programme Area 2: Water Resources


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