TITLE:
Two-Dimensional Magnetotelluric Forward Research for the Vertical Anisotropy
AUTHORS:
Miao-Xin Yang, Han-Dong Tan, Mao Wang, Huan Ma
KEYWORDS:
Vertical Anisotropy, Magnetotelluric Method, Isotropy, Anisotropy Effect
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.10,
October
30,
2015
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.