Open AccessInterpretation of magnetotelluric sounding data for the 2‐D inhomogeneous model of the Earth
Author(s) -
Porokhova L. N.,
Morozov L. A.,
Vardanyants I. L.
Publication year - 1991
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1991.tb04602.x
Subject(s) - magnetotellurics , inverse problem , inversion (geology) , mathematical analysis , iterative method , iterative and incremental development , depth sounding , geophysics , inverse , kernel (algebra) , geology , mathematics , geometry , physics , algorithm , electrical resistivity and conductivity , computer science , pure mathematics , oceanography , quantum mechanics , paleontology , software engineering , structural basin
Summary The case of E polarization of the natural electromagnetic field is analysed. The E y ( x, z ) component is calculated by an iterative procedure with the conductivity ó( x, z ) being set as an arbitrary function of two coordinates. The essence of the proposed 2‐D inversion technique consists of correction of ó( x, z ) at each step of the 2‐D direct problem solution in accordance with surface admittance data. The iterative process stops when an admittance misfit reaches a given quantity. On the last iteration the accuracy of the calculated field component E ( x, z ) is checked. It is shown that the correction ó( x, z ) at the sites x can be found through the solution 1‐D linearized inverse problem with a 2‐D kernel of the Fréchet differential.