Theory of ground surface plasma wave associated with pre-earthquake electrical charges
Article first published online: 28 MAR 2013
This paper is not subject to U.S. copyright. Published in 2012 by the American Geophysical Union.
Volume 48, Issue 2, pages 122–130, March/April 2013
How to Cite
2013), Theory of ground surface plasma wave associated with pre-earthquake electrical charges, Radio Sci., 48, 122–130, doi:10.1029/2012RS005084.(
- Issue published online: 24 MAY 2013
- Article first published online: 28 MAR 2013
- Manuscript Accepted: 1 NOV 2012
- Manuscript Revised: 24 OCT 2012
- Manuscript Received: 8 AUG 2012
- ground surface plasma wave;
- pre-earthquake signal
 It is shown theoretically that if mobile electrical charge exists on the surface of the ground, a ground surface plasma wave is induced by radio waves. If the electrical charges are generated by tectonic stresses acting on crustal rocks prior to major earthquakes, the detection of a ground surface plasma wave could be used as a pre-earthquake electromagnetic phenomenon. The ground surface plasma wave has a dispersion relation, i.e., the relation between frequency and wavelength, similar to that of the free-space plane wave in the atmosphere over the radio broadcast frequency range. It allows for a strong coupling between these two types of waves. This is a mode of electromagnetic wave propagation that has not been previously reported. Numerical analysis demonstrates (1) the propagation of the ground surface plasma wave along a curved surface beyond the line of sight, (2) anomalous scattering by ground surface roughness, and (3) the generation of cross-polarized waves due to the scattering. These results all agree well with radio wave anomalies observed before large earthquakes.