Abstract
When we study and process magnetotelluric data, the earth's interior structure is usually equated with isotropic medium in the existing approaches. When the underground structure is complex, there is serious resistivity anisotropy in macroscopic view, and then the traditional processing and interpretation methods often produce wrong results. For that we must establish the study method based on the anisotropy in order to explain the measured data exactly. In this paper, by considering the change of resistivity in three electrical spindle directions, we deduce two-dimensional magnetotelluric variational equation for vertical anisotropy. The study region is divided into many rectangular units, and it is dealt with linear interpolation in each of them. By comparing with former achievements including the results of the isotropic and anisotropic models, it demonstrates the validity of the program. The pseudosection map of vertical anisotropic body shows that we can’t ignore the anisotropy effect and provides a solid foundation for the further inversion study.
Highlights
Magnetotelluric method which is based on natural alternating electromagnetic field source is the main geophysical prospecting method to study the earth’s crust and upper mantle electrical structure through observing orthogonal electric field and magnetic field components on the ground
Magnetotelluric method compared with other means of exploration has many advantages such as great exploration depth, low cost and convenient field work, and it is widely used in various fields
Previous studies have shown that the anisotropic problems cannot be ignored, but there is no related literature in the field of two-dimensional magnetotelluric doing the study about the difference between vertical anisotropy and isotropy
Summary
Magnetotelluric method which is based on natural alternating electromagnetic field source is the main geophysical prospecting method to study the earth’s crust and upper mantle electrical structure through observing orthogonal electric field and magnetic field components on the ground. (2015) Two-Dimensional Magnetotelluric Forward Research for the Vertical Anisotropy. The study of one-dimension anisotropy [1] and two-dimension isotropy [2] [3] forward and inversion problems is quite mature, but for two-dimension anisotropic problem, international and domestic academics mostly do the study of symmetrical anisotropic medium, such as Xu (1985) [4], Yang (1997) [5], etc. Previous studies have shown that the anisotropic problems cannot be ignored, but there is no related literature in the field of two-dimensional magnetotelluric doing the study about the difference between vertical anisotropy and isotropy. In this paper, based on the research status quo, by using the rectangular element subdivision and linear interpolation in each element, the study of the vertical anisotropic medium and vertical anisotropy is done, and the comparison with the results of isotropic body shows that we can’t ignore the anisotropy effect
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