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Very low frequency magnetotelluric and dipole-dipole responses of three-dimensional thin-layer resistivity structure modeled using finite elements

Author
Wannamaker, P. E.
Published
United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
An algorithm to simulate the very low frequency magnetotelluric and dipole-dipole responses of three-dimensional thin-layer inhomogeneity has been developed from an existing finite element program used to simulate resistivity/IP signatures of 2-D earth sections. The 3-D body is confined to and extends uniformly across a thin layer overlain by air and underlain by infinite resistivity. Electric fields are obtained through differentiation of piecewise parabolas fit to nodal voltages while magnetic fields arise from integration of the free-space Green's tensor over secondary current perturbations throughout the thin layer. Dipole-dipole apparent resistivities arise through application to nodal voltages of the logarithmic geometric factors appropriate to continuously grounded line sources of current. Checks on accuracy of the simulation utilize analytic solutions, 2-D AC plane-wave results using finite elements, and a surface integral equations technique. 18 refs., 14 figs.
Report Numbers
DE86002011; DOE/SAN/12196-14; ESL-159
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC03-84SF12196
OSTI Identifier 5150010
Research organization: Utah Univ. Research Inst., Salt Lake City (USA). Earth Sciences Lab.
View MARC record | catkey: 47359432