Abstract
The magnetotelluric method developed by Cagniard is applicable to the determination of subsurface resistivity of a homogeneous layered earth. Large deviations from the true resistivity may be observed when the method is used to determine the resistivity of inhomogeneous and/or anisotropic mediums. Besides, the apparent resistivities computed from one pair of orthogonal electric and magnetic field components may be significantly different from those computed from the other pair of orthogonal field components. This paper describes a method for interpreting these structures. The method is based on the same assumptions as underlie the magnetotelluric method developed by Cagniard. It is applicable only if the magnetotelluric field is linearly polarized. The magnetotelluric sounding curve obtained at Beiseker, Alberta, Canada, is used to show the applicability of the method. Anisotropy in the Precambrian basement rocks is suggested as a causative agent for the marked difference between the apparent resistivity values calculated from two pairs of orthogonal electric and magnetic field components at Beiseker.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
