Articles | Volume 4, issue 5/6
Nat. Hazards Earth Syst. Sci., 4, 757–767, 2004

Special issue: Precursory phenomena, seismic hazard evaluation and seismo-tectonic...

Nat. Hazards Earth Syst. Sci., 4, 757–767, 2004

  22 Nov 2004

22 Nov 2004

Lithosphere-atmosphere-ionosphere coupling as governing mechanism for preseismic short-term events in atmosphere and ionosphere

O. Molchanov1, E. Fedorov1, A. Schekotov1, E. Gordeev2, V. Chebrov3, V. Surkov1, A. Rozhnoi1, S. Andreevsky1, D. Iudin4, S. Yunga3, A. Lutikov3, M. Hayakawa5, and P. F. Biagi6 O. Molchanov et al.
  • 1Inst. of the Physics of the Earth, Russian Academy of Sciences, Bolshaya Gruzinskaya 10, 123995, Moscow D-242, Russia
  • 2Inst. of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
  • 3Geophysical Survey, Russian Academy of Sciences, Russia
  • 4Radiophysical Research Institute, Nizhni Novgorod, Russia
  • 5University of Electro-Communications, Chofu 1-5-1, Tokyo 182, Japan
  • 6University of Bari, Italy

Abstract. We present a general concept of mechanisms of preseismic phenomena in the atmosphere and ionosphere. After short review of observational results we conclude: 1. Upward migration of fluid substrate matter (bubble) can lead to ousting of the hot water/gas near the ground surface and cause an earthquake (EQ) itself in the strength-weakened area; 2. Thus, time and place of the bubble appearance could be random values, but EQ, geochemistry anomaly and foreshocks (seismic, SA and ULF electromagnetic ones) are casually connected; 3. Atmospheric perturbation of temperature and density could follow preseismic hot water/gas release resulting in generation of atmospheric gravity waves (AGW) with periods in a range of 6–60min; 4. Seismo-induced AGW could lead to modification of the ionospheric turbulence and to the change of over-horizon radio-wave propagation in the atmosphere, perturbation of LF waves in the lower ionosphere and ULF emission depression at the ground.