On Es-spread effects in the ionosphere connected to earthquakes

E. V. Liperovskaya (1) , C.-V. Meister (2) , O. A. Pokhotelov (1) , Michel Parrot (3) , V. V. Bogdanov (4) , N. E. Vasil'Eva (1)

1 IPE - Schmidt United Institute of Physics of the Earth [Moscow]
2 High School and Science Programme Brandenburg/Potsdam
3 LPCE - Laboratoire de physique et chimie de l'environnement
4 Inst. of Cosmophysical Research and Radio Wave Propagation

In the present work, phenomena in the ionosphere are studied, which are connected with earthquakes (16 events) having a depth of less than 50 km and a magnitude M larger than 4. Analysed are night-time Es-spread effects using data of the vertical sounding station Petropavlovsk-Kamchatsky (f=53.0°, ?=158.7°) from May 2004 until August 2004 registered every 15 min. It is found that the maximum distance of the earthquake from the sounding station, where pre-seismic phenomena are yet observable, depends on the magnitude of the earthquake. Further it is shown that 1–2 days before the earthquakes, in the pre-midnight hours, the appearance of Es-spread increases. With a probability of more than 0.95, this increase of Es-spread observations before midnight is not casual.

Domaines: Interfaces continentales, environnement; Océan, Atmosphère; Sciences de la Terre

E. V. Liperovskaya, C.-V. Meister, O. A. Pokhotelov, Michel Parrot, V. V. Bogdanov, et al.. On Es-spread effects in the ionosphere connected to earthquakes. Natural Hazards and Earth System Sciences, 2006, 6 (5), pp.741-744. ⟨10.5194/nhess-6-741-2006⟩. ⟨hal-00330915⟩