Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.133..649s&link_type=abstract
Geophysical Journal International, Volume 133, Issue 3, pp. 649-668.
Physics
12
Scientific paper
The VLF-R (very low frequency-resistivity) data, i.e. the apparent resistivity (ρa ) and phase (φ) data, were inverted individually and jointly using the VFSA (very fast simulated annealing) global inversion approach. Global inversion results for synthetic data without and with various amounts of random and normally distributed Gaussian noise reveal that the inversion of neither the ρa nor φ data alone yields the true parameters of the structures. However, the joint inversion of the ρa and φ data yields very good estimates of the model parameters. Five models, representing typical subsurface structures in the shield areas, are studied here. Various models achieved after 10 VFSA runs were used to compute the mean model and the corresponding covariance and correlation matrices, which were used to estimate the uncertainties in the mean model parameters and correlations between the model parameters. We observe that these correlations follow the physics associated with the problem. VLF-R field data due to a nearly vertical contact structure and a very thick dyke-like structure were also inverted to demonstrate the efficacy of the approach in the delineation of the parameters of 2-D structures.
Kaikkonen P.
Sharma Surendra P.
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