Ionospheric penetration characteristics of ELF waves radiated from a current source in the lithosphere related to seismic activity
Electromagnetic wave radiation from an underground current source related to seismic activity is discussed. In order to estimate the ionospheric effects on the electromagnetic waves associated with the seismic activity, ELF waves in the frequency range from 10 Hz to 1 kHz in the ionosphere radiated...
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Published in | Radio science Vol. 44; no. 1; pp. RS1005 - n/a |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
American Geophysical Union
01.02.2009
Blackwell Publishing Ltd |
Subjects | |
Online Access | Get full text |
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Summary: | Electromagnetic wave radiation from an underground current source related to seismic activity is discussed. In order to estimate the ionospheric effects on the electromagnetic waves associated with the seismic activity, ELF waves in the frequency range from 10 Hz to 1 kHz in the ionosphere radiated from a possible seismic current source modeled as an electric dipole located in the lithosphere, are precisely computed by using a full‐wave analysis. In this calculation, the ionosphere is assumed to be an inhomogeneous and anisotropic medium, and the Earth's crust is assumed to be a homogeneous and isotropic conductive medium. Especially, the effects of the geomagnetic field on the ionospheric wave propagation are precisely considered. The results of the calculations in the frequency range from 10 Hz to 1 kHz show frequency dependence in spatial distributions of the wave intensities due to the geomagnetic field‐aligned whistler propagation in the ionosphere and the Earth‐ionosphere waveguide propagation. Wave intensities which could be observed on the ground and in the ionosphere are determined by assuming the magnitude of the current moment of a seismic dipole source. In a possible situation, the current moment is estimated to be about 80 A·m/Hz1/2 which generates a detectable wave magnetic field on the ground just above a seismic source. However, if we try to detect it in the ionosphere, the source current moment must be thousands of times more intense. |
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Bibliography: | ark:/67375/WNG-L60T73KB-6 Tab-delimited Table 1. ArticleID:2008RS003927 istex:535A82802ADE794EB54473D65A76480DBCDED16A ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0048-6604 1944-799X |
DOI: | 10.1029/2008RS003927 |