Perturbation of an external magnetic field by a Rayleigh surface wave
Elastic waves propagating in the earth's crust generate perturbations of the geomagnetic field which are amenable to measurement. A correlation is observed between the displacement of the earth's surface and the oscillations of the electromagnetic field induced by the seismic waves. This effect is attributable to the action of currents in the earth's crust which are induced by the movement of its conducting material in the geomagnetic field. In this paper the authors calculate the induced alternating electromagnetic field from the specified motion of the medium in a Rayleigh wave. They investigate various sources of Rayleigh waves, including harmonic, line, and point, and analyze the influence of electrical conductivity of the medium, the source depth, and other parameters on the nature of the electromagnetic signal at large distances. The effect is similar in nature to the action of an acoustic perturbation on the E layer of the ionosphere.
- OSTI ID:
- 6993095
- Journal Information:
- Magnetohydrodynamics (Engl. Transl.); (United States), Journal Name: Magnetohydrodynamics (Engl. Transl.); (United States) Vol. 23:2; ISSN MGHDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
CHARGE DENSITY
DIFFUSION
DISTURBANCES
EARTH CRUST
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC FIELDS
FREQUENCY DEPENDENCE
GEOMAGNETIC FIELD
GEOPHYSICAL SURVEYS
HARMONICS
MAGNETIC FIELDS
MATHEMATICAL MODELS
OSCILLATIONS
PHYSICAL PROPERTIES
RAYLEIGH WAVES
SEISMIC SOURCES
SEISMIC SURFACE WAVES
SEISMIC SURVEYS
SEISMIC WAVES
SURVEYS
WAVE PROPAGATION