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Mining Publication: Electromagnetic Surface Fields Due to a Magnetic Dipole Buried in a Three-Layered Earth

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Original creation date: October 1982

Image of publication Electromagnetic Surface Fields Due to a Magnetic Dipole Buried in a Three-Layered Earth

The Bureau of Mines electromagnetic trapped miner location and communications system requires a thorough understanding of through-the-earth electromagnetic wave propagation. An earth model incorporating a magnetic dipole buried in a three-layered earth has been developed. The dipole source is located in the second subsurface layer. By application of proper limiting values, the three-layered model is reduced to two different two-layered models and eventually to the homogeneous half-space model. The solutions are in the form of infinite integrals. A numerical analysis was carried out and a computer program written to evaluate the surface magnetic fields. Numerical values for the magnetic field at the point above the source are presented in a variety of models.

Authors: SM Shope

Report of Investigations - October 1982

NIOSHTIC2 Number: 10002569

Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, NTIS No. PB83-148064, RI 8702, 1982 Oct; :1-22


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