Spatially constrained inversion for quasi 3D modeling of AEM data

Andrea Viezzoli, Anders Vest Christiansen, Esben Auken

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

2 Citations (Scopus)

Abstract

The spatially constrained inversion (SCI) is a robust methodology for quasi-3D modeling of geoelectrical and EM data of varying spatial density, using a 1D forward solution. It can be implemented with airborne or ground-based data, both in frequency and time domain. The airborne EM data here presented show how the SCI produces laterally smooth results with sharp layer boundaries that respect the 3D geological variations of layered settings. Information migrate horizontally through spatial constraints applied between nearest neighboring soundings, and allow to resolve layers that would be locally poorly resolved. The constraints are built using the Delaunay triangulation, which ensures automatic adaptation to data density variations. Data sets, models and spatial constraints are inverted as one system, producing layered sections with smooth horizontal variations. The SCI suppresses the elongated artifact commonly seen in horizontal maps (i.e., average resistivity, or saltwater boundary elevation maps) resulting from profile oriented data sets. Being an over-determined parameterized inversion problem, it produces a full sensitivity analysis of the output models, an essential tool for the evaluation of the results.

Original languageEnglish
Title of host publicationEnvironmental and Engineering Geophysical Society - 21st Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008
Pages1422-1426
Number of pages5
Publication statusPublished - 2008
Externally publishedYes
Event21st Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008 - Philadelphia, PA, United States
Duration: 6 Apr 200810 Apr 2008

Publication series

NameEnvironmental and Engineering Geophysical Society - 21st Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008
Volume2

Conference

Conference21st Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008
Country/TerritoryUnited States
CityPhiladelphia, PA
Period6/04/0810/04/08

Programme Area

  • Programme Area 2: Water Resources

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