TY  - JOUR
A1  - Klose, Tim
A1  - Guillemoteau, Julien
A1  - Vignoli, Giulio
A1  - Tronicke, Jens
T1  - Laterally constrained inversion (LCI) of multi-configuration EMI data with tunable sharpness
JF  - Journal of applied geophysics
N2  - Frequency-domain electromagnetic (FDEM) data are commonly inverted to characterize subsurface geoelectrical properties using smoothness constraints in 1D inversion schemes assuming a layered medium. 
Smoothness constraints are suitable for imaging gradual transitions of subsurface geoelectrical properties caused, for example, by varying sand, clay, or fluid content. However, such inversion approaches are limited in characterizing sharp interfaces. Alternative regularizations based on the minimum gradient support (MGS) stabilizers can, instead, be used to promote results with different levels of smoothness/sharpness selected by simply acting on the so-called focusing parameter. 
The MGS regularization has been implemented for different kinds of geophysical data inversion strategies. However, concerning FDEM data, the MGS regularization has only been implemented for vertically constrained inversion (VCI) approaches but not for laterally constrained inversion (LCI) approaches. 
We present a novel LCI approach for FDEM data using the MGS regularization for the vertical and lateral direction. Using synthetic and field data examples, we demonstrate that our approach can efficiently and automatically provide a set of model solutions characterized by different levels of sharpness and variable lateral consistencies. 
In terms of data misfit, the obtained set of solutions contains equivalent models allowing us also to investigate the non-uniqueness of FDEM data inversion.
KW  - frequency-domain electromagnetics
KW  - laterally constrained inversion
KW  - minimum gradient support regularization
KW  - peat characterization
Y1  - 2022
U6  - https://doi.org/10.1016/j.jappgeo.2021.104519
SN  - 0926-9851
VL  - 196
PB  - Elsevier
CY  - Amsterdam
ER  -