Electromagnetic induction by a finite electric dipole source over a 2-D earth
- Univ. of British Columbia, Vancouver, BC (Canada)
- Los Alamos National Lab., NM (United States)
- Woods Hole Oceanographic Institution, MA (United States)
A numerical solution for the frequency domain electromagnetic response of a two-dimensional (2-D) conductivity structure to excitation by a three-dimensional (3-D) current source has been developed. The fields are Fourier transformed in the invariant conductivity direction and then expressed in a variational form. At each of a set of discrete spatial wavenumbers a finite-element method is used to obtain a solution for the secondary electromagnetic fields. The finite element uses exponential elements to efficiently model the fields in the far-field. In combination with an iterative solution for the along-strike electromagnetic fields, this produces a considerable reduction in computation costs. The numerical solutions for a horizontal electric dipole are computed and shown to agree with closed form expressions and to converge with respect to the parameterization. Finally some simple examples of the electromagnetic fields produced by horizontal electric dipole sources at both the sea floor and air-earth interface are presented to illustrate the usefulness of the code.
- OSTI ID:
- 5999808
- Journal Information:
- Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 58:2; ISSN GPYSA7; ISSN 0016-8033
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580000* -- Geosciences
CONTINENTAL MARGIN
DATA ANALYSIS
DIPOLES
ELECTRIC DIPOLES
ELECTRICAL SURVEYS
ELECTROMAGNETIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTROMAGNETIC SURVEYS
FOURIER TRANSFORMATION
FUNCTIONS
GEOPHYSICAL SURVEYS
INTEGRAL TRANSFORMATIONS
MULTIPOLES
NUMERICAL SOLUTION
RADIATIONS
RESPONSE FUNCTIONS
SEA BED
SURVEYS
TRANSFORMATIONS
TWO-DIMENSIONAL CALCULATIONS