Abstract
Possibilities for three-dimensional (3D) magnetotelluric (MT) sounding of local objects contained in the Earth’s crust are estimated in a case study of the magma chamber of the Vesuvius volcano. Stochastic inversion of the model MT data by the Markov Chain Monte Carlo (MCMC) method has shown that the most efficient approach is not simultaneous but successive estimation of the geometry and the depth of the anomaly and the assessment of the conductivity distribution within the anomalous region. A zone of equivalence is revealed between the a priori estimate of the depth of the anomalous zone and the a posteriori distribution of electric conductivity within it. Based on the present estimation and previous results, an algorithm for determination of the parameters of local crustal anomaly is proposed.
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Original Russian Text © V.V. Spichak, 2011, published in Fizika Zemli, 2011, No. 1, pp. 76–80.
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Spichak, V.V. Numerical simulation and inversion of MT fields in the 3D electric conductivity model of the Vesuvius volcano. Izv., Phys. Solid Earth 47, 72–76 (2011). https://doi.org/10.1134/S1069351311010125
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DOI: https://doi.org/10.1134/S1069351311010125