Accession Number : AD0781740

Title :   Magneto-Telluric Fields for a Segmented Overburden.

Descriptive Note : Technical rept.,

Corporate Author : OFFICE OF TELECOMMUNICATIONS BOULDER COLO INST FOR TELECOMMUNICATION SCIENCES

Personal Author(s) : Wait,James R. ; Spies,Kenneth P.

Report Date : 31 MAY 1974

Pagination or Media Count : 76

Abstract : Adopting an idealized two-dimensional model, the authors consider the electro-magnetic fields existing in a crustal layer that has any number of homogeneous segments with vertical interfaces. The magnetic field vector is everywhere parallel to these interfaces and to the earth's surface. Using a quasistatic approach, expressions for the electric fields at the earth's surface are derived and calculations for the actual surface impedance are then presented. It is shown that the vertical contacts will cause strong perturbations of the surface impedance calculated on the basis of a locally uniform slab model. This could be an important factor in carrying out the interpretation of magneto-telluric data. (Author)

Descriptors :   *Earth crust, *Geophysical prospecting, Electromagnetic fields, Segmented, Electrical impedance, Telluric currents, Geophysical prospecting

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE