Articles | Volume 7, issue 5
https://doi.org/10.5194/se-7-1405-2016
https://doi.org/10.5194/se-7-1405-2016
Research article
 | 
19 Oct 2016
Research article |  | 19 Oct 2016

Ionospheric influence on the seismo-telluric current related to electromagnetic signals observed before the Wenchuan MS 8.0 earthquake

Mei Li, Handong Tan, and Meng Cao

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Cited articles

Akhoondzadeh, M., Parrot, M., and Saradjian, M. R.: Electron and ion density variations before strong earthquakes (M > 6.0) using DEMETER and GPS data, Nat. Hazards Earth Syst. Sci., 10, 7–18, https://doi.org/10.5194/nhess-10-7-2010, 2010.
Bernardi, A., Fraser–Smith, A. C., McGill, P. R., and Villard Jr., O. G.: Magnetic field measurements near the epicenter of the MS7.1 Loma Prieta earthquake, Phys. Earth Planet Interiors, 68, 45–63, 1991.
Bortnik, J., Bleier, T. E., Dunson, C., and Freund, F.: Estimating the seismotelluric current required for observable electromagnetic ground signals, Ann. Geophys., 28, 1615–1624, https://doi.org/10.5194/angeo-28-1615-2010, 2010.
Cummer, S. A.: Modeling Electromagnetic Propagation in the Earth–Ionosphere Waveguide, IEEE T. Antenn. Propag., 48, 2–12, 2000.
Draganov, A. B., Inan, U. S., and Taranenko, Y. N.: ULF magnetic signatures at the Earth due to groundwater flow: a possible precursor to earthquakes, Geophys. Res. Lett., 18, 1127–1130, 1991.
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Short summary
The paper focuses on the enhancement of the electromagnetic signal in the waveguide between the surface of the Earth and ionosphere. The ionosphere can facilitate the electromagnetic wave propagation, as if the detectability of the observing system is improved effectively, which makes it reasonable that sometimes electromagnetic signals are recorded at a seemingly unreasonable distance.