TY - JOUR
T1 - Objective function analysis for electric soundings (VES), transient electromagnetic soundings (TEM) and joint inversion VES/TEM
AU - Bortolozo, Cassiano Antonio
AU - Bokhonok, Oleg
AU - Porsani, Jorge Luís
AU - Monteiro dos Santos, Fernando Acácio
AU - Diogo, Liliana Alcazar
AU - Slob, Evert
PY - 2017/11/1
Y1 - 2017/11/1
N2 - Ambiguities in geophysical inversion results are always present. How these ambiguities appear in most cases open to interpretation. It is interesting to investigate ambiguities with regard to the parameters of the models under study. Residual Function Dispersion Map (RFDM) can be used to differentiate between global ambiguities and local minima in the objective function. We apply RFDM to Vertical Electrical Sounding (VES) and TEM Sounding inversion results. Through topographic analysis of the objective function we evaluate the advantages and limitations of electrical sounding data compared with TEM sounding data, and the benefits of joint inversion in comparison with the individual methods. The RFDM analysis proved to be a very interesting tool for understanding the joint inversion method of VES/TEM. Also the advantage of the applicability of the RFDM analyses in real data is explored in this paper to demonstrate not only how the objective function of real data behaves but the applicability of the RFDM approach in real cases. With the analysis of the results, it is possible to understand how the joint inversion can reduce the ambiguity of the methods.
AB - Ambiguities in geophysical inversion results are always present. How these ambiguities appear in most cases open to interpretation. It is interesting to investigate ambiguities with regard to the parameters of the models under study. Residual Function Dispersion Map (RFDM) can be used to differentiate between global ambiguities and local minima in the objective function. We apply RFDM to Vertical Electrical Sounding (VES) and TEM Sounding inversion results. Through topographic analysis of the objective function we evaluate the advantages and limitations of electrical sounding data compared with TEM sounding data, and the benefits of joint inversion in comparison with the individual methods. The RFDM analysis proved to be a very interesting tool for understanding the joint inversion method of VES/TEM. Also the advantage of the applicability of the RFDM analyses in real data is explored in this paper to demonstrate not only how the objective function of real data behaves but the applicability of the RFDM approach in real cases. With the analysis of the results, it is possible to understand how the joint inversion can reduce the ambiguity of the methods.
KW - Electrical sounding
KW - Joint inversion
KW - Objective function
KW - Residual Function Dispersion Maps
KW - Transient electromagnetic sounding
UR - http://www.scopus.com/inward/record.url?scp=85032897603&partnerID=8YFLogxK
U2 - 10.1016/j.jappgeo.2017.09.016
DO - 10.1016/j.jappgeo.2017.09.016
M3 - Article
SN - 0926-9851
VL - 146
SP - 120
EP - 137
JO - Journal of Applied Geophysics
JF - Journal of Applied Geophysics
ER -