摘要:

A previous analysis for a line source on a homogeneous half‐space model of the earth is extended to allow for the presence of stratification. The formal integral solution is reduced to a form suitable for numerical integration. Also, a number of special cases and limiting forms are considered. It is shown that the subsurface field has a structure that can be significantly modified when the half‐space is no longer homogeneous. The results have application to the design of electromagnetic techniques in mine rescue operati

ISSN:0048-6604    

DOI:10.1029/RS008i008p00805

年代:1973

数据来源: WILEY

摘要:

Recursion relations satisfied by the coefficients in certain asymptotic expansions of monochromatic wavefields are pointed out and discussed. One of the relations provides a simple means for obtaining higher‐order coefficients from a knowledge of the coefficient of the first‐order term, and it yields expressions for the coefficients in a very simple form. The utility of that relation is demonstrated by applying it in Sommerfeld's problem of the radiation of an electromagnetic dipole in the presence of a dissipative half‐

ISSN:0048-6604    

DOI:10.1029/RS008i008p00811

年代:1973

数据来源: WILEY

摘要:

The effect of a spherical inhomogeneity on the surface fields of a buried magnetic dipole source is determined from the reradiated fields of induced electric and magnetic dipole moments. For small spheres where the theory is valid, the errors introduced in source location are shown to be small. The results have possible application to rescue operations following coal mine disasters.

ISSN:0048-6604    

DOI:10.1029/RS008i008p00813

年代:1973

数据来源: WILEY